code

src/Notes/app/src/main/java/net/micode/notes/ui/NoteEditActivity.java

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+package net.micode.notes.ui;
+
+import android.app.Activity;
+import android.app.AlarmManager;
+import android.app.AlertDialog;
+import android.app.PendingIntent;
+import android.app.SearchManager;
+import android.appwidget.AppWidgetManager;
+import android.content.ContentUris;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.graphics.Paint;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.text.Spannable;
+import android.text.SpannableString;
+import android.text.TextUtils;
+import android.text.format.DateUtils;
+import android.text.style.BackgroundColorSpan;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.WindowManager;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.CompoundButton.OnCheckedChangeListener;
+import android.widget.EditText;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.TextNote;
+import net.micode.notes.model.WorkingNote;
+import net.micode.notes.model.WorkingNote.NoteSettingChangedListener;
+import net.micode.notes.tool.DataUtils;
+import net.micode.notes.tool.ResourceParser;
+import net.micode.notes.tool.ResourceParser.TextAppearanceResources;
+import net.micode.notes.ui.DateTimePickerDialog.OnDateTimeSetListener;
+import net.micode.notes.ui.NoteEditText.OnTextViewChangeListener;
+import net.micode.notes.widget.NoteWidgetProvider_2x;
+import net.micode.notes.widget.NoteWidgetProvider_4x;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * @Package:        net.micode.notes.ui
+ * @ClassName:      NoteEditActivity
+ * @Description:
+ * 该类主要是针对标签的编辑
+ * 继承了系统内部许多和监听有关的类
+ * @Author:         YangYizhe
+ * @CreateDate:     12/21/2023 12:47 AM
+ * @Version:        1.0
+ */
+public class NoteEditActivity extends Activity implements OnClickListener,
+        NoteSettingChangedListener, OnTextViewChangeListener {
+    /**
+     * 类属性的定义
+     */
+    private class HeadViewHolder {
+        public TextView tvModified;
+
+        public ImageView ivAlertIcon;
+
+        public TextView tvAlertDate;
+
+        public ImageView ibSetBgColor;
+    }
+    private static final Map<Integer, Integer> sBgSelectorBtnsMap = new HashMap<Integer, Integer>();
+    static {
+        sBgSelectorBtnsMap.put(R.id.iv_bg_yellow, ResourceParser.YELLOW);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_red, ResourceParser.RED);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_blue, ResourceParser.BLUE);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_green, ResourceParser.GREEN);
+        sBgSelectorBtnsMap.put(R.id.iv_bg_white, ResourceParser.WHITE);
+    }
+
+    private static final Map<Integer, Integer> sBgSelectorSelectionMap = new HashMap<Integer, Integer>();
+    static {
+        sBgSelectorSelectionMap.put(ResourceParser.YELLOW, R.id.iv_bg_yellow_select);
+        sBgSelectorSelectionMap.put(ResourceParser.RED, R.id.iv_bg_red_select);
+        sBgSelectorSelectionMap.put(ResourceParser.BLUE, R.id.iv_bg_blue_select);
+        sBgSelectorSelectionMap.put(ResourceParser.GREEN, R.id.iv_bg_green_select);
+        sBgSelectorSelectionMap.put(ResourceParser.WHITE, R.id.iv_bg_white_select);
+    }
+
+    private static final Map<Integer, Integer> sFontSizeBtnsMap = new HashMap<Integer, Integer>();
+    static {
+        sFontSizeBtnsMap.put(R.id.ll_font_large, ResourceParser.TEXT_LARGE);
+        sFontSizeBtnsMap.put(R.id.ll_font_small, ResourceParser.TEXT_SMALL);
+        sFontSizeBtnsMap.put(R.id.ll_font_normal, ResourceParser.TEXT_MEDIUM);
+        sFontSizeBtnsMap.put(R.id.ll_font_super, ResourceParser.TEXT_SUPER);
+    }
+
+    private static final Map<Integer, Integer> sFontSelectorSelectionMap = new HashMap<Integer, Integer>();
+    static {
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_LARGE, R.id.iv_large_select);
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_SMALL, R.id.iv_small_select);
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_MEDIUM, R.id.iv_medium_select);
+        sFontSelectorSelectionMap.put(ResourceParser.TEXT_SUPER, R.id.iv_super_select);
+    }
+
+    private static final String TAG = "NoteEditActivity";
+    private HeadViewHolder mNoteHeaderHolder;
+    private View mHeadViewPanel;
+    private View mNoteBgColorSelector;
+    private View mFontSizeSelector;
+    private EditText mNoteEditor;
+    private View mNoteEditorPanel;
+    public WorkingNote mWorkingNote;
+    private SharedPreferences mSharedPrefs;
+    private int mFontSizeId;
+
+    private static final String PREFERENCE_FONT_SIZE = "pref_font_size";
+
+    private static final int SHORTCUT_ICON_TITLE_MAX_LEN = 10;
+
+    public static final String TAG_CHECKED = String.valueOf('\u221A');
+    public static final String TAG_UNCHECKED = String.valueOf('\u25A1');
+
+    private LinearLayout mEditTextList;
+
+    private String mUserQuery;
+    private Pattern mPattern;
+    /**
+     *在 Activity 创建时进行一些初始化工作，包括设置布局、初始化状态和资源等操作
+     */
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        this.setContentView(R.layout.note_edit);
+        if (savedInstanceState == null && !initActivityState(getIntent())) {
+            finish();
+            return;
+        }
+        initResources();
+    }
+
+    /**
+     * Current activity may be killed when the memory is low. Once it is killed, for another time
+     * user load this activity, we should restore the former state
+     */
+    @Override
+    protected void onRestoreInstanceState(Bundle savedInstanceState) {
+        super.onRestoreInstanceState(savedInstanceState);
+        if (savedInstanceState != null && savedInstanceState.containsKey(Intent.EXTRA_UID)) {
+            Intent intent = new Intent(Intent.ACTION_VIEW);
+            intent.putExtra(Intent.EXTRA_UID, savedInstanceState.getLong(Intent.EXTRA_UID));
+            if (!initActivityState(intent)) {
+                finish();
+                return;
+            }
+            Log.d(TAG, "Restoring from killed activity");
+        }
+    }
+
+
+    private boolean initActivityState(Intent intent) {
+        /**
+         * If the user specified the {@link Intent#ACTION_VIEW} but not provided with id,
+         * then jump to the NotesListActivity
+         */
+        mWorkingNote = null;
+        if (TextUtils.equals(Intent.ACTION_VIEW, intent.getAction())) {
+            long noteId = intent.getLongExtra(Intent.EXTRA_UID, 0);
+            mUserQuery = "";
+            /**
+             * Starting from the searched result
+             */
+            //根据键值查找ID
+            if (intent.hasExtra(SearchManager.EXTRA_DATA_KEY)) {
+                noteId = Long.parseLong(intent.getStringExtra(SearchManager.EXTRA_DATA_KEY));
+                mUserQuery = intent.getStringExtra(SearchManager.USER_QUERY);
+            }
+            //如果ID在数据库中未找到
+            if (!DataUtils.visibleInNoteDatabase(getContentResolver(), noteId, Notes.TYPE_NOTE)) {
+                Intent jump = new Intent(this, NotesListActivity.class);
+                startActivity(jump);
+                //程序将跳转到上面声明的intent——jump
+                showToast(R.string.error_note_not_exist);
+                finish();
+                return false;
+            }
+            //ID在数据库中找到
+            else {
+                mWorkingNote = WorkingNote.load(this, noteId);
+                if (mWorkingNote == null) {
+                    Log.e(TAG, "load note failed with note id" + noteId);
+                    //打印出红色的错误信息
+                    finish();
+                    return false;
+                }
+            }
+            getWindow().setSoftInputMode(
+                    WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN
+                            | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
+        } else if(TextUtils.equals(Intent.ACTION_INSERT_OR_EDIT, intent.getAction())) {
+            long folderId = intent.getLongExtra(Notes.INTENT_EXTRA_FOLDER_ID, 0);
+            int widgetId = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_ID,
+                    AppWidgetManager.INVALID_APPWIDGET_ID);
+            int widgetType = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_TYPE,
+                    Notes.TYPE_WIDGET_INVALIDE);
+            int bgResId = intent.getIntExtra(Notes.INTENT_EXTRA_BACKGROUND_ID,
+                    ResourceParser.getDefaultBgId(this));
+            String phoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
+            long callDate = intent.getLongExtra(Notes.INTENT_EXTRA_CALL_DATE, 0);
+            if (callDate != 0 && phoneNumber != null) {
+                if (TextUtils.isEmpty(phoneNumber)) {
+                    Log.w(TAG, "The call record number is null");
+                }
+                long noteId = 0;
+                if ((noteId = DataUtils.getNoteIdByPhoneNumberAndCallDate(getContentResolver(),
+                        phoneNumber, callDate)) > 0) {
+                    mWorkingNote = WorkingNote.load(this, noteId);
+                    if (mWorkingNote == null) {
+                        Log.e(TAG, "load call note failed with note id" + noteId);
+                        finish();
+                        return false;
+                    }
+                } else {
+                    mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId,
+                            widgetType, bgResId);
+                    mWorkingNote.convertToCallNote(phoneNumber, callDate);
+                }
+            } else {
+                mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId, widgetType,
+                        bgResId);
+            }
+
+            getWindow().setSoftInputMode(
+                    WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
+                            | WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
+        } else {
+            Log.e(TAG, "Intent not specified action, should not support");
+            finish();
+            return false;
+        }
+        mWorkingNote.setOnSettingStatusChangedListener(this);
+        return true;
+    }
+
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        initNoteScreen();
+    }
+
+
+    private void initNoteScreen() {
+        mNoteEditor.setTextAppearance(this, TextAppearanceResources
+                .getTexAppearanceResource(mFontSizeId));
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+            switchToListMode(mWorkingNote.getContent());
+        } else {
+            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
+            mNoteEditor.setSelection(mNoteEditor.getText().length());
+        }
+        for (Integer id : sBgSelectorSelectionMap.keySet()) {
+            findViewById(sBgSelectorSelectionMap.get(id)).setVisibility(View.GONE);
+        }
+        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId());
+        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId());
+
+        mNoteHeaderHolder.tvModified.setText(DateUtils.formatDateTime(this,
+                mWorkingNote.getModifiedDate(), DateUtils.FORMAT_SHOW_DATE
+                        | DateUtils.FORMAT_NUMERIC_DATE | DateUtils.FORMAT_SHOW_TIME
+                        | DateUtils.FORMAT_SHOW_YEAR));
+
+        /**
+         * TODO: Add the menu for setting alert. Currently disable it because the DateTimePicker
+         * is not ready
+         */
+        showAlertHeader();
+    }
+
+    private void showAlertHeader() {
+        if (mWorkingNote.hasClockAlert()) {
+            long time = System.currentTimeMillis();
+            if (time > mWorkingNote.getAlertDate()) {
+                mNoteHeaderHolder.tvAlertDate.setText(R.string.note_alert_expired);
+            }
+            else {
+                mNoteHeaderHolder.tvAlertDate.setText(DateUtils.getRelativeTimeSpanString(
+                        mWorkingNote.getAlertDate(), time, DateUtils.MINUTE_IN_MILLIS));
+            }
+            mNoteHeaderHolder.tvAlertDate.setVisibility(View.VISIBLE);
+            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.VISIBLE);
+        } else {
+            mNoteHeaderHolder.tvAlertDate.setVisibility(View.GONE);
+            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.GONE);
+        };
+    }
+
+
+    @Override
+    protected void onNewIntent(Intent intent) {
+        super.onNewIntent(intent);
+        initActivityState(intent);
+    }
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        /**
+         * For new note without note id, we should firstly save it to
+         * generate a id. If the editing note is not worth saving, there
+         * is no id which is equivalent to create new note
+         */
+        if (!mWorkingNote.existInDatabase()) {
+            saveNote();
+        }
+        outState.putLong(Intent.EXTRA_UID, mWorkingNote.getNoteId());
+        Log.d(TAG, "Save working note id: " + mWorkingNote.getNoteId() + " onSaveInstanceState");
+    }
+    @Override
+    public boolean dispatchTouchEvent(MotionEvent ev) {
+        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE
+                && !inRangeOfView(mNoteBgColorSelector, ev)) {
+            mNoteBgColorSelector.setVisibility(View.GONE);
+            return true;
+        }
+
+        if (mFontSizeSelector.getVisibility() == View.VISIBLE
+                && !inRangeOfView(mFontSizeSelector, ev)) {
+            mFontSizeSelector.setVisibility(View.GONE);
+            return true;
+        }
+        return super.dispatchTouchEvent(ev);
+    }
+
+    private boolean inRangeOfView(View view, MotionEvent ev) {
+        int []location = new int[2];
+        view.getLocationOnScreen(location);
+        int x = location[0];
+        int y = location[1];
+        if (ev.getX() < x
+                || ev.getX() > (x + view.getWidth())
+                || ev.getY() < y
+                || ev.getY() > (y + view.getHeight()))
+        {
+            return false;
+        }
+        return true;
+    }
+
+    private void initResources() {
+        mHeadViewPanel = findViewById(R.id.note_title);
+        mNoteHeaderHolder = new HeadViewHolder();
+        mNoteHeaderHolder.tvModified = (TextView) findViewById(R.id.tv_modified_date);
+        mNoteHeaderHolder.ivAlertIcon = (ImageView) findViewById(R.id.iv_alert_icon);
+        mNoteHeaderHolder.tvAlertDate = (TextView) findViewById(R.id.tv_alert_date);
+        mNoteHeaderHolder.ibSetBgColor = (ImageView) findViewById(R.id.btn_set_bg_color);
+        mNoteHeaderHolder.ibSetBgColor.setOnClickListener(this);
+        mNoteEditor = (EditText) findViewById(R.id.note_edit_view);
+        mNoteEditorPanel = findViewById(R.id.sv_note_edit);
+        mNoteBgColorSelector = findViewById(R.id.note_bg_color_selector);
+        for (int id : sBgSelectorBtnsMap.keySet()) {
+            ImageView iv = (ImageView) findViewById(id);
+            iv.setOnClickListener(this);
+        }
+
+        mFontSizeSelector = findViewById(R.id.font_size_selector);
+        for (int id : sFontSizeBtnsMap.keySet()) {
+            View view = findViewById(id);
+            view.setOnClickListener(this);
+        };
+        mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
+        mFontSizeId = mSharedPrefs.getInt(PREFERENCE_FONT_SIZE, ResourceParser.BG_DEFAULT_FONT_SIZE);
+        /**
+         * HACKME: Fix bug of store the resource id in shared preference.
+         * The id may larger than the length of resources, in this case,
+         * return the {@link ResourceParser#BG_DEFAULT_FONT_SIZE}
+         */
+        if(mFontSizeId >= TextAppearanceResources.getResourcesSize()) {
+            mFontSizeId = ResourceParser.BG_DEFAULT_FONT_SIZE;
+        }
+        mEditTextList = (LinearLayout) findViewById(R.id.note_edit_list);
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        if(saveNote()) {
+            Log.d(TAG, "Note data was saved with length:" + mWorkingNote.getContent().length());
+        }
+        clearSettingState();
+    }
+    private void updateWidget() {
+        Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
+        if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_2X) {
+            intent.setClass(this, NoteWidgetProvider_2x.class);
+        } else if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_4X) {
+            intent.setClass(this, NoteWidgetProvider_4x.class);
+        } else {
+            Log.e(TAG, "Unspported widget type");
+            return;
+        }
+
+        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] {
+                mWorkingNote.getWidgetId()
+        });
+
+        sendBroadcast(intent);
+        setResult(RESULT_OK, intent);
+    }
+
+
+    public void onClick(View v) {
+        int id = v.getId();
+        if (id == R.id.btn_set_bg_color) {
+            mNoteBgColorSelector.setVisibility(View.VISIBLE);
+            findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
+                    View.VISIBLE);
+        } else if (sBgSelectorBtnsMap.containsKey(id)) {
+            findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
+                    View.GONE);
+            mWorkingNote.setBgColorId(sBgSelectorBtnsMap.get(id));
+            mNoteBgColorSelector.setVisibility(View.GONE);
+        } else if (sFontSizeBtnsMap.containsKey(id)) {
+            findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.GONE);
+            mFontSizeId = sFontSizeBtnsMap.get(id);
+            mSharedPrefs.edit().putInt(PREFERENCE_FONT_SIZE, mFontSizeId).commit();
+            findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE);
+            if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+                getWorkingText();
+                switchToListMode(mWorkingNote.getContent());
+            } else {
+                mNoteEditor.setTextAppearance(this,
+                        TextAppearanceResources.getTexAppearanceResource(mFontSizeId));
+            }
+            mFontSizeSelector.setVisibility(View.GONE);
+        }
+    }
+
+    @Override
+    public void onBackPressed() {
+        if(clearSettingState()) {
+            return;
+        }
+
+        saveNote();
+        super.onBackPressed();
+    }
+
+    private boolean clearSettingState() {
+        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE) {
+            mNoteBgColorSelector.setVisibility(View.GONE);
+            return true;
+        } else if (mFontSizeSelector.getVisibility() == View.VISIBLE) {
+            mFontSizeSelector.setVisibility(View.GONE);
+            return true;
+        }
+        return false;
+    }
+    public void onBackgroundColorChanged() {
+        findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
+                View.VISIBLE);
+        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId());
+        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId());
+    }
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        if (isFinishing()) {
+            return true;
+        }
+        clearSettingState();
+        menu.clear();
+        if (mWorkingNote.getFolderId() == Notes.ID_CALL_RECORD_FOLDER) {
+            getMenuInflater().inflate(R.menu.call_note_edit, menu);
+        } else {
+            getMenuInflater().inflate(R.menu.note_edit, menu);
+        }
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+            menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_normal_mode);
+        } else {
+            menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_list_mode);
+        }
+        if (mWorkingNote.hasClockAlert()) {
+            menu.findItem(R.id.menu_alert).setVisible(false);
+        } else {
+            menu.findItem(R.id.menu_delete_remind).setVisible(false);
+        }
+        return true;
+    }
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        int itemId = item.getItemId();
+        if (itemId == R.id.menu_new_note) {
+            createNewNote();
+        }
+        else if (itemId == R.id.menu_delete) {
+            AlertDialog.Builder builder = new AlertDialog.Builder(this);
+            builder.setTitle(getString(R.string.alert_title_delete));
+            builder.setIcon(android.R.drawable.ic_dialog_alert);
+            builder.setMessage(getString(R.string.alert_message_delete_note));
+            builder.setPositiveButton(android.R.string.ok,
+                    new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int which) {
+                            deleteCurrentNote();
+                            finish();
+                        }
+                    });
+            builder.setNegativeButton(android.R.string.cancel, null);
+            builder.show();
+        } else if (itemId == R.id.menu_font_size) {
+            mFontSizeSelector.setVisibility(View.VISIBLE);
+            findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE);
+        } else if (itemId == R.id.menu_list_mode) {
+            mWorkingNote.setCheckListMode(mWorkingNote.getCheckListMode() == 0 ?
+                    TextNote.MODE_CHECK_LIST : 0);
+        } else if (itemId == R.id.menu_share) {
+            getWorkingText();
+            sendTo(this, mWorkingNote.getContent());
+        } else if (itemId == R.id.menu_send_to_desktop) {
+            sendToDesktop();
+        } else if (itemId == R.id.menu_alert) {
+            setReminder();
+        } else if (itemId == R.id.menu_delete_remind) {
+            mWorkingNote.setAlertDate(0, false);
+        }
+        return true;
+    }
+
+    /**
+     * @method  setReminder
+     * @description 设置提醒Remind me
+     * @date: 12/21/2023 8:04 AM
+     * @author: YangYizhe
+     */
+    private void setReminder() {
+        DateTimePickerDialog d = new DateTimePickerDialog(this, System.currentTimeMillis());
+        d.setOnDateTimeSetListener(new OnDateTimeSetListener() {
+            public void OnDateTimeSet(AlertDialog dialog, long date) {
+                mWorkingNote.setAlertDate(date	, true);
+                //选择提醒的日期
+            }
+        });
+        d.show();
+    }
+
+
+    /**
+     * Share note to apps that support {@link Intent#ACTION_SEND} action
+     * and {@text/plain} type
+     */
+    private void sendTo(Context context, String info) {
+        Intent intent = new Intent(Intent.ACTION_SEND);
+        intent.putExtra(Intent.EXTRA_TEXT, info);
+        intent.setType("text/plain");
+        context.startActivity(intent);
+    }
+    private void createNewNote() {
+        // Firstly, save current editing notes
+        saveNote();
+
+        // For safety, start a new NoteEditActivity
+        finish();
+        Intent intent = new Intent(this, NoteEditActivity.class);
+        intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
+        intent.putExtra(Notes.INTENT_EXTRA_FOLDER_ID, mWorkingNote.getFolderId());
+        startActivity(intent);
+    }
+    private void deleteCurrentNote() {
+        if (mWorkingNote.existInDatabase()) {
+            HashSet<Long> ids = new HashSet<Long>();
+            long id = mWorkingNote.getNoteId();
+            if (id != Notes.ID_ROOT_FOLDER) {
+                ids.add(id);
+            } else {
+                Log.d(TAG, "Wrong note id, should not happen");
+            }
+            if (!isSyncMode()) {
+                if (!DataUtils.batchDeleteNotes(getContentResolver(), ids)) {
+                    Log.e(TAG, "Delete Note error");
+                }
+            } else {
+                if (!DataUtils.batchMoveToFolder(getContentResolver(), ids, Notes.ID_TRASH_FOLER)) {
+                    Log.e(TAG, "Move notes to trash folder error, should not happens");
+                }
+            }
+        }
+        mWorkingNote.markDeleted(true);
+    }
+    private boolean isSyncMode() {
+        return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0;
+    }
+    public void onClockAlertChanged(long date, boolean set) {
+        /**
+         * User could set clock to an unsaved note, so before setting the
+         * alert clock, we should save the note first
+         */
+        if (!mWorkingNote.existInDatabase()) {
+            saveNote();
+        }
+        if (mWorkingNote.getNoteId() > 0) {
+            Intent intent = new Intent(this, AlarmReceiver.class);
+            intent.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mWorkingNote.getNoteId()));
+            PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
+            AlarmManager alarmManager = ((AlarmManager) getSystemService(ALARM_SERVICE));
+            showAlertHeader();
+            if(!set) {
+                alarmManager.cancel(pendingIntent);
+            } else {
+                alarmManager.set(AlarmManager.RTC_WAKEUP, date, pendingIntent);
+            }
+        } else {
+            /**
+             * There is the condition that user has input nothing (the note is
+             * not worthy saving), we have no note id, remind the user that he
+             * should input something
+             */
+            Log.e(TAG, "Clock alert setting error");
+            showToast(R.string.error_note_empty_for_clock);
+        }
+    }
+    public void onWidgetChanged() {
+        updateWidget();
+    }
+    public void onEditTextDelete(int index, String text) {
+        int childCount = mEditTextList.getChildCount();
+        if (childCount == 1) {
+            return;
+        }
+
+        for (int i = index + 1; i < childCount; i++) {
+            ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text))
+                    .setIndex(i - 1);
+        }
+
+        mEditTextList.removeViewAt(index);
+        NoteEditText edit = null;
+        if(index == 0) {
+            edit = (NoteEditText) mEditTextList.getChildAt(0).findViewById(
+                    R.id.et_edit_text);
+        } else {
+            edit = (NoteEditText) mEditTextList.getChildAt(index - 1).findViewById(
+                    R.id.et_edit_text);
+        }
+        int length = edit.length();
+        edit.append(text);
+        edit.requestFocus();
+        edit.setSelection(length);
+    }
+    public void onEditTextEnter(int index, String text) {
+        /**
+         * Should not happen, check for debug
+         */
+        if(index > mEditTextList.getChildCount()) {
+            Log.e(TAG, "Index out of mEditTextList boundrary, should not happen");
+        }
+
+        View view = getListItem(text, index);
+        mEditTextList.addView(view, index);
+        NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
+        edit.requestFocus();
+        edit.setSelection(0);
+        for (int i = index + 1; i < mEditTextList.getChildCount(); i++) {
+            ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text))
+                    .setIndex(i);
+        }
+    }
+    private void switchToListMode(String text) {
+        mEditTextList.removeAllViews();
+        String[] items = text.split("\n");
+        int index = 0;
+        for (String item : items) {
+            if(!TextUtils.isEmpty(item)) {
+                mEditTextList.addView(getListItem(item, index));
+                index++;
+            }
+        }
+        mEditTextList.addView(getListItem("", index));
+        mEditTextList.getChildAt(index).findViewById(R.id.et_edit_text).requestFocus();
+
+        mNoteEditor.setVisibility(View.GONE);
+        mEditTextList.setVisibility(View.VISIBLE);
+    }
+    private Spannable getHighlightQueryResult(String fullText, String userQuery) {
+        SpannableString spannable = new SpannableString(fullText == null ? "" : fullText);
+        if (!TextUtils.isEmpty(userQuery)) {
+            mPattern = Pattern.compile(userQuery);
+            Matcher m = mPattern.matcher(fullText);
+            int start = 0;
+            while (m.find(start)) {
+                spannable.setSpan(
+                        new BackgroundColorSpan(this.getResources().getColor(
+                                R.color.user_query_highlight)), m.start(), m.end(),
+                        Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
+                start = m.end();
+            }
+        }
+        return spannable;
+    }
+    private View getListItem(String item, int index) {
+        View view = LayoutInflater.from(this).inflate(R.layout.note_edit_list_item, null);
+        final NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
+        edit.setTextAppearance(this, TextAppearanceResources.getTexAppearanceResource(mFontSizeId));
+        CheckBox cb = ((CheckBox) view.findViewById(R.id.cb_edit_item));
+        cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                if (isChecked) {
+                    edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
+                } else {
+                    edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);
+                }
+            }
+        });
+
+        if (item.startsWith(TAG_CHECKED)) {
+            cb.setChecked(true);
+            edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
+            item = item.substring(TAG_CHECKED.length(), item.length()).trim();
+        } else if (item.startsWith(TAG_UNCHECKED)) {
+            cb.setChecked(false);
+            edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);
+            item = item.substring(TAG_UNCHECKED.length(), item.length()).trim();
+        }
+
+        edit.setOnTextViewChangeListener(this);
+        edit.setIndex(index);
+        edit.setText(getHighlightQueryResult(item, mUserQuery));
+        return view;
+    }
+    public void onTextChange(int index, boolean hasText) {
+        if (index >= mEditTextList.getChildCount()) {
+            Log.e(TAG, "Wrong index, should not happen");
+            return;
+        }
+        if(hasText) {
+            mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.VISIBLE);
+        } else {
+            mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.GONE);
+        }
+    }
+
+    public void onCheckListModeChanged(int oldMode, int newMode) {
+        if (newMode == TextNote.MODE_CHECK_LIST) {
+            switchToListMode(mNoteEditor.getText().toString());
+            //检查模式切换到列表模式
+        } else {
+            if (!getWorkingText()) {
+                mWorkingNote.setWorkingText(mWorkingNote.getContent().replace(TAG_UNCHECKED + " ",
+                        ""));
+            }
+            //若是获取到文本就改变其检查标记
+            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
+            mEditTextList.setVisibility(View.GONE);
+            mNoteEditor.setVisibility(View.VISIBLE);
+            //修改文本编辑器的内容和可见性
+        }
+    }
+    private boolean getWorkingText() {
+        boolean hasChecked = false;
+        //初始化check标记
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+            // 若模式为CHECK_LIST
+            StringBuilder sb = new StringBuilder();
+            //创建可变字符串
+            for (int i = 0; i < mEditTextList.getChildCount(); i++) {
+                View view = mEditTextList.getChildAt(i);
+                //遍历所有子编辑框的视图
+                NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
+                if (!TextUtils.isEmpty(edit.getText())) {
+                    //若文本不为空
+                    if (((CheckBox) view.findViewById(R.id.cb_edit_item)).isChecked()) {
+                        //该选项框已打钩
+                        sb.append(TAG_CHECKED).append(" ").append(edit.getText()).append("\n");
+                        hasChecked = true;
+                        //扩展字符串为已打钩并把标记置true
+                    } else {
+                        sb.append(TAG_UNCHECKED).append(" ").append(edit.getText()).append("\n");
+                        //扩展字符串添加未打钩
+                    }
+                }
+            }
+            mWorkingNote.setWorkingText(sb.toString());
+            //利用编辑好的字符串设置运行便签的内容
+        } else {
+            mWorkingNote.setWorkingText(mNoteEditor.getText().toString());
+            // 若不是该模式直接用编辑器中的内容设置运行中标签的内容
+        }
+        return hasChecked;
+    }
+    /**
+     * @method  saveNote
+     * @description
+     * 保存便签,退出时候会自动调本函数
+     * @date: 12/21/2023 8:14 AM
+     * @author: YangYizhe
+     * @param
+     * @return
+     */
+    private boolean saveNote() {
+        getWorkingText();
+        boolean saved = mWorkingNote.saveNote();
+        //运行 getWorkingText()之后保存
+        if (saved) {
+            /**
+             * There are two modes from List view to edit view, open one note,
+             * create/edit a node. Opening node requires to the original
+             * position in the list when back from edit view, while creating a
+             * new node requires to the top of the list. This code
+             * {@link #RESULT_OK} is used to identify the create/edit state
+             */
+            //如英文注释所说链接RESULT_OK是为了识别保存的2种情况，一是创建后保存，二是修改后保存
+            setResult(RESULT_OK);
+        }
+        return saved;
+    }
+    /**
+     * @method  sendToDesktop
+     * @description
+     * send to home功能，发到桌面上
+     * @date: 12/21/2023 8:15 AM
+     * @author: YangYizhe
+     * @param
+     * @return
+     */
+    private void sendToDesktop() {
+        /**
+         * Before send message to home, we should make sure that current
+         * editing note is exists in databases. So, for new note, firstly
+         * save it
+         */
+        if (!mWorkingNote.existInDatabase()) {
+            saveNote();
+        }
+
+        if (mWorkingNote.getNoteId() > 0) {
+            Intent sender = new Intent();
+            Intent shortcutIntent = new Intent(this, NoteEditActivity.class);
+            shortcutIntent.setAction(Intent.ACTION_VIEW);
+            shortcutIntent.putExtra(Intent.EXTRA_UID, mWorkingNote.getNoteId());
+            sender.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
+            sender.putExtra(Intent.EXTRA_SHORTCUT_NAME,
+                    makeShortcutIconTitle(mWorkingNote.getContent()));
+            sender.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE,
+                    Intent.ShortcutIconResource.fromContext(this, R.drawable.icon_app));
+            sender.putExtra("duplicate", true);
+            sender.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
+            showToast(R.string.info_note_enter_desktop);
+            sendBroadcast(sender);
+        } else {
+            /**
+             * There is the condition that user has input nothing (the note is
+             * not worthy saving), we have no note id, remind the user that he
+             * should input something
+             */
+            Log.e(TAG, "Send to desktop error");
+            showToast(R.string.error_note_empty_for_send_to_desktop);
+        }
+    }
+    private String makeShortcutIconTitle(String content) {
+        content = content.replace(TAG_CHECKED, "");
+        content = content.replace(TAG_UNCHECKED, "");
+        return content.length() > SHORTCUT_ICON_TITLE_MAX_LEN ? content.substring(0,
+                SHORTCUT_ICON_TITLE_MAX_LEN) : content;
+    }
+    private void showToast(int resId) {
+        showToast(resId, Toast.LENGTH_SHORT);
+    }
+    private void showToast(int resId, int duration) {
+        Toast.makeText(this, resId, duration).show();
+    }
+}

src/main/AndroidManifest.xml

@@ -1,4 +1,20 @@
 <?xml version="1.0" encoding="utf-8"?>
+
+<!-- Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
 <!--- 定义应用程序的名称和版本号 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="net.micode.notes"
@@ -35,12 +51,21 @@
         android:icon="@drawable/icon_app_1"
         android:label="@string/app_name"
         android:requestLegacyExternalStorage="true"
+        android:debuggable="true"
+        android:extractNativeLibs="true"
+        android:icon="@drawable/icon_app"
+        android:label="@string/app_name"
         android:testOnly="true" >
         <activity
             android:name=".ui.SplashActivity"
             android:configChanges="orientation|keyboardHidden|screenSize"
             android:exported="true"
+
             android:theme="@style/Theme.Notes.Fullscreen">
+            android:label="@string/app_name"
+            android:launchMode="singleTop"
+            android:theme="@style/NoteTheme"
+            android:windowSoftInputMode="adjustPan" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />

src/main/java/net/micode/notes/data/Contact.java

@@ -52,22 +52,13 @@ public class Contact {
             + "(SELECT raw_contact_id "
             + " FROM phone_lookup"
             + " WHERE min_match = '+')";
-     /**
+    //获取联系人
-      * @method          getContact
-      * @description:
-      * @date:           2023/12/21 19:18
-      * @author:         WuShuxian
-      * @param:          context
-      * @param:          phoneNumber
-      * @return:         String
-      */
     public static String getContact(Context context, String phoneNumber) {
-        //
+        if(sContactCache == null) {/*如果缓存为空，就新建一个*/
-        if(sContactCache == null) {
             sContactCache = new HashMap<String, String>();
         }
 
-        if(sContactCache.containsKey(phoneNumber)) {
+        if(sContactCache.containsKey(phoneNumber)) {/*如果缓存中已经有该电话号码对应的联系人名字，就直接返回*/
             return sContactCache.get(phoneNumber);
         }
 

src/main/java/net/micode/notes/ui/AlarmAlertActivity.java

@@ -46,23 +46,21 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        // 设置界面显示——无标题
+
-        requestWindowFeature(Window.FEATURE_NO_TITLE);
+        requestWindowFeature(Window.FEATURE_NO_TITLE);//设置界面显示——无标题
 
         final Window win = getWindow();
-        // 设置窗体属性——在锁屏时显示
+
-        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
+        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);//设置窗体属性——在锁屏时显示
 
         if (!isScreenOn()) {
-            // 设置窗体属性——保持点亮、点亮屏幕、允许点亮时解锁
+            win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON//保持点亮、点亮屏幕、允许点亮时解锁
-            win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                     | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                     | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
                     | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
         }
 
-        // 获取传递的 Intent
+        Intent intent = getIntent();//获取传递的 Intent
-        Intent intent = getIntent();
 
         try {
             // 从 Intent 中获取数据并处理——获取标签 ID
@@ -80,24 +78,33 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
 
         mPlayer = new MediaPlayer();
         if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
-            // 显示对话框
+            showActionDialog();// 显示对话框
-            showActionDialog();
+            playAlarmSound();// 播放闹钟提示音
-            // 播放闹钟提示音
-            playAlarmSound();
         } else {
-            // 结束当前 Activity
+            finish();// 结束当前 Activity
-            finish();
         }
     }
-
+    /**
+     * @method  isScreenOn
+     * @description
+     * 判断屏幕是否锁屏，调用系统函数判断，最后返回值是布尔类型
+     * @date: 12/23/2023 11:21 PM
+     * @author: YangYizhe
+     * @param
+     * @return
+     */
     private boolean isScreenOn() {
-        //判断屏幕是否锁屏，调用系统函数判断，最后返回值是布尔类型
         PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
         return pm.isScreenOn();
     }
-
+    /**
+     * @method  playAlarmSound
+     * @description
+     * 播放闹钟提示音
+     * @date: 12/23/2023 11:21 PM
+     * @author: YangYizhe
+     */
     private void playAlarmSound() {
-        //闹钟提示音激发
         Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
         //调用系统的铃声管理URI，得到闹钟提示音
         int silentModeStreams = Settings.System.getInt(getContentResolver(),
@@ -110,19 +117,12 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         }
         try {
             mPlayer.setDataSource(this, url);
-            //方法：setDataSource(Context context, Uri uri) 
-            //解释：无返回值，设置多媒体数据来源【根据 Uri】
             mPlayer.prepare();
-            //准备同步
+            mPlayer.setLooping(true);//设置是否循环播放
-            mPlayer.setLooping(true);
+            mPlayer.start();//开始播放
-            //设置是否循环播放
-            mPlayer.start();
-            //开始播放
         } catch (IllegalArgumentException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
-            //e.printStackTrace()函数功能是抛出异常， 还将显示出更深的调用信息
-            //System.out.println(e)，这个方法打印出异常，并且输出在哪里出现的异常
         } catch (SecurityException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
@@ -134,7 +134,16 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
             e.printStackTrace();
         }
     }
-
+    /**
+     * @method  showActionDialog
+     * @description
+     * AlertDialog的构造方法全部是Protected的
+     * 所以不能直接通过new一个AlertDialog来创建出一个AlertDialog。
+     * 要创建一个AlertDialog，就要用到AlertDialog.Builder中的create()方法
+     * 如这里的dialog就是新建了一个AlertDialog
+     * @date: 12/23/2023 11:28 PM
+     * @author: YangYizhe
+     */
     private void showActionDialog() {
         AlertDialog.Builder dialog = new AlertDialog.Builder(this);
         /* AlertDialog的构造方法全部是Protected的
@@ -142,53 +151,55 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         * 要创建一个AlertDialog，就要用到AlertDialog.Builder中的create()方法
         * 如这里的dialog就是新建了一个AlertDialog
         */
-        dialog.setTitle(R.string.app_name);
+        dialog.setTitle(R.string.app_name);//为对话框设置标题
-        //为对话框设置标题
+        dialog.setMessage(mSnippet);//为对话框设置内容
-        dialog.setMessage(mSnippet);
+        dialog.setPositiveButton(R.string.notealert_ok, this);//给对话框添加"Yes"按钮
-        //为对话框设置内容
-        dialog.setPositiveButton(R.string.notealert_ok, this);
-        //给对话框添加"Yes"按钮
         if (isScreenOn()) {
-            dialog.setNegativeButton(R.string.notealert_enter, this);
+            dialog.setNegativeButton(R.string.notealert_enter, this);//对话框添加"No"按钮
-        }//对话框添加"No"按钮
+        }
         dialog.show().setOnDismissListener(this);
     }
-
+    /**
+     * @method  onClick
+     * @description 处理点击事件
+     * @date: 12/23/2023 11:27 PM
+     * @author: YangYizhe
+     * @param dialog
+     * @param which
+     */
     public void onClick(DialogInterface dialog, int which) {
-        switch (which) {
+        switch (which) {//用which来选择click后下一步的操作
-            //用which来选择click后下一步的操作
+            case DialogInterface.BUTTON_NEGATIVE://这是取消操作
-            case DialogInterface.BUTTON_NEGATIVE:
+                Intent intent = new Intent(this, NoteEditActivity.class);//实现两个类间的数据传输
-                //这是取消操作
+                intent.setAction(Intent.ACTION_VIEW);//设置动作属性
-                Intent intent = new Intent(this, NoteEditActivity.class);
+                intent.putExtra(Intent.EXTRA_UID, mNoteId);//实现key-value对     EXTRA_UID为key；mNoteId为键
-                //实现两个类间的数据传输
+                startActivity(intent);//开始动作
-                intent.setAction(Intent.ACTION_VIEW);
-                //设置动作属性
-                intent.putExtra(Intent.EXTRA_UID, mNoteId);
-                //实现key-value对
-                //EXTRA_UID为key；mNoteId为键
-                startActivity(intent);
-                //开始动作
                 break;
             default:
-                //这是确定操作
                 break;
         }
     }
-
+    /**
+     * @method  onDismiss
+     * @description 忽略
+     * @date: 12/23/2023 11:25 PM
+     * @author: YangYizhe
+     * @param dialog
+     */
     public void onDismiss(DialogInterface dialog) {
-        //忽略
+        stopAlarmSound();//停止闹钟声音
-        stopAlarmSound();
-        //停止闹钟声音
         finish();
-        //完成该动作
     }
-
+    /**
+     * @method  stopAlarmSound
+     * @description 停止闹钟的声音
+     * @date: 12/23/2023 11:26 PM
+     * @author: YangYizhe
+     */
     private void stopAlarmSound() {
         if (mPlayer != null) {
-            mPlayer.stop();
+            mPlayer.stop();//停止播放
-            //停止播放
+            mPlayer.release();//释放MediaPlayer对象
-            mPlayer.release();
-            //释放MediaPlayer对象
             mPlayer = null;
         }
     }

src/main/java/net/micode/notes/ui/DateTimePicker.java

@@ -0,0 +1,518 @@
+package net.micode.notes.ui;
+
+import java.text.DateFormatSymbols;
+import java.util.Calendar;
+
+import net.micode.notes.R;
+
+
+import android.content.Context;
+import android.text.format.DateFormat;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.NumberPicker;
+/**
+ * @Package:        net.micode.notes.ui
+ * @ClassName:      DateTimePicker
+ * @Description: 继承自FrameLayout，实现了日期和时间的选择功能
+ * 提供一个用户界面，让用户可以方便地选择日期和时间，并且能够监听用户对日期和时间的改变
+ * 构造方法，包括默认构造方法和带参数的构造方法，用于初始化日期选择器的界面和属性；
+ * 一系列的回调方法，用于监听日期和时间的改变，包括日期选择、小时选择、分钟选择、上午/下午选择等；
+ * 一些公开的接口方法，用于设置当前日期、时间，设置24小时模式或12小时模式的切换等；
+ * 辅助方法，用于更新日期、小时、上午/下午选择器的界面显示和属性；
+ * 回调接口OnDateTimeChangedListener，用于监听日期和时间的改变事件。
+ * @Author:         YangYizhe
+ * @CreateDate:     12/21/2023 12:18 AM
+ * @Version:        1.0
+ */
+public class DateTimePicker extends FrameLayout {
+    //FrameLayout是布局模板之一
+    private static final boolean DEFAULT_ENABLE_STATE = true;
+
+    private static final int HOURS_IN_HALF_DAY = 12;
+    private static final int HOURS_IN_ALL_DAY = 24;
+    private static final int DAYS_IN_ALL_WEEK = 7;
+    private static final int DATE_SPINNER_MIN_VAL = 0;
+    private static final int DATE_SPINNER_MAX_VAL = DAYS_IN_ALL_WEEK - 1;
+    private static final int HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW = 0;
+    private static final int HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW = 23;
+    private static final int HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW = 1;
+    private static final int HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW = 12;
+    private static final int MINUT_SPINNER_MIN_VAL = 0;
+    private static final int MINUT_SPINNER_MAX_VAL = 59;
+    private static final int AMPM_SPINNER_MIN_VAL = 0;
+    private static final int AMPM_SPINNER_MAX_VAL = 1;
+    /**
+     * 初始化控件
+     * NumberPicker是数字选择器
+     * 这里定义的四个变量全部是在设置闹钟时需要选择的变量（如日期、时、分、上午或者下午）
+     */
+    private final NumberPicker mDateSpinner;
+    private final NumberPicker mHourSpinner;
+    private final NumberPicker mMinuteSpinner;
+    private final NumberPicker mAmPmSpinner;
+    private Calendar mDate;//定义了Calendar类型的变量mDate，用于操作时间
+    private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
+
+    private boolean mIsAm;
+
+    private boolean mIs24HourView;
+
+    private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
+
+    private boolean mInitialising;
+
+    private OnDateTimeChangedListener mOnDateTimeChangedListener;
+
+    private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
+            updateDateControl();
+            onDateTimeChanged();
+        }
+    };//OnValueChangeListener，这是时间改变监听器，这里主要是对日期的监听
+
+
+    private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
+        //这里是对 小时（Hour） 的监听
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            boolean isDateChanged = false;
+            Calendar cal = Calendar.getInstance();
+            //声明一个Calendar的变量cal，便于后续的操作
+            if (!mIs24HourView) {
+                if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1);
+                    isDateChanged = true;
+                    //这里是对于12小时制时，晚上11点和12点交替时对日期的更改
+                } else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1);
+                    isDateChanged = true;
+                }
+                //这里是对于12小时制时，凌晨11点和12点交替时对日期的更改
+                if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
+                        oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
+                    mIsAm = !mIsAm;
+                    updateAmPmControl();
+                }//这里是对于12小时制时，中午11点和12点交替时对AM和PM的更改
+            } else {
+                if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1);
+                    isDateChanged = true;
+                    //这里是对于24小时制时，晚上11点和12点交替时对日期的更改
+                } else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) {
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1);
+                    isDateChanged = true;
+                }
+            } //这里是对于12小时制时，凌晨11点和12点交替时对日期的更改
+            int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
+            //通过数字选择器对newHour的赋值
+            mDate.set(Calendar.HOUR_OF_DAY, newHour);
+            //通过set函数将新的Hour值传给mDate
+            onDateTimeChanged();
+            if (isDateChanged) {
+                setCurrentYear(cal.get(Calendar.YEAR));
+                setCurrentMonth(cal.get(Calendar.MONTH));
+                setCurrentDay(cal.get(Calendar.DAY_OF_MONTH));
+            }
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        //这里是对 分钟（Minute）改变的监听
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            int minValue = mMinuteSpinner.getMinValue();
+            int maxValue = mMinuteSpinner.getMaxValue();
+            int offset = 0;
+            //设置offset，作为小时改变的一个记录数据
+            if (oldVal == maxValue && newVal == minValue) {
+                offset += 1;
+            } else if (oldVal == minValue && newVal == maxValue) {
+                offset -= 1;
+            }
+            //如果原值为59，新值为0，则offset加1
+            //如果原值为0，新值为59，则offset减1
+            if (offset != 0) {
+                mDate.add(Calendar.HOUR_OF_DAY, offset);
+                mHourSpinner.setValue(getCurrentHour());
+                updateDateControl();
+                int newHour = getCurrentHourOfDay();
+                if (newHour >= HOURS_IN_HALF_DAY) {
+                    mIsAm = false;
+                    updateAmPmControl();
+                } else {
+                    mIsAm = true;
+                    updateAmPmControl();
+                }
+            }
+            mDate.set(Calendar.MINUTE, newVal);
+            onDateTimeChanged();
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
+        //对AM和PM的监听
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            mIsAm = !mIsAm;
+            if (mIsAm) {
+                mDate.add(Calendar.HOUR_OF_DAY, -HOURS_IN_HALF_DAY);
+            } else {
+                mDate.add(Calendar.HOUR_OF_DAY, HOURS_IN_HALF_DAY);
+            }
+            updateAmPmControl();
+            onDateTimeChanged();
+        }
+    };
+
+    public interface OnDateTimeChangedListener {
+        void onDateTimeChanged(DateTimePicker view, int year, int month,
+                               int dayOfMonth, int hourOfDay, int minute);
+    }
+    /**
+     * 构造方法
+     */
+    public DateTimePicker(Context context) {
+        this(context, System.currentTimeMillis());//通过对数据库的访问，获取当前的系统时间
+    }
+
+    public DateTimePicker(Context context, long date) {
+        this(context, date, DateFormat.is24HourFormat(context));//上面函数的得到的是一个天文数字（1970至今的秒数），需要DateFormat将其变得有意义
+    }
+
+    public DateTimePicker(Context context, long date, boolean is24HourView) {
+        super(context);
+        mDate = Calendar.getInstance();//获取系统时间
+        mInitialising = true;
+        mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
+        inflate(context, R.layout.datetime_picker, this);
+        /*
+        * 如果当前Activity里用到别的layout，比如对话框layout
+        * 还要设置这个layout上的其他组件的内容，就必须用inflate()方法先将对话框的layout找出来
+        * 然后再用findViewById()找到它上面的其它组件
+        */
+        mDateSpinner = (NumberPicker) findViewById(R.id.date);
+        mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
+        mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
+        mDateSpinner.setOnValueChangedListener(mOnDateChangedListener);
+
+        mHourSpinner = (NumberPicker) findViewById(R.id.hour);
+        mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);
+        mMinuteSpinner = (NumberPicker) findViewById(R.id.minute);
+        mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
+        mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL);
+        mMinuteSpinner.setOnLongPressUpdateInterval(100);
+        mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);
+
+        String[] stringsForAmPm = new DateFormatSymbols().getAmPmStrings();
+        mAmPmSpinner = (NumberPicker) findViewById(R.id.amPm);
+        mAmPmSpinner.setMinValue(AMPM_SPINNER_MIN_VAL);
+        mAmPmSpinner.setMaxValue(AMPM_SPINNER_MAX_VAL);
+        mAmPmSpinner.setDisplayedValues(stringsForAmPm);
+        mAmPmSpinner.setOnValueChangedListener(mOnAmPmChangedListener);
+
+        // update controls to initial state
+        updateDateControl();
+        updateHourControl();
+        updateAmPmControl();
+
+        set24HourView(is24HourView);
+
+        // set to current time
+        setCurrentDate(date);
+
+        setEnabled(isEnabled());
+
+        // set the content descriptions
+        mInitialising = false;
+    }
+
+    /**
+     * @method  setEnabled
+     * @description
+     * 用于设置是否启用日期选择器控件的功能
+     * 先通过传入的参数enabled判断是否需要改变控件的启用状态。
+     * 如果传入的参数和当前的启用状态相同，则直接返回，不进行任何操作
+     * 如果传入的参数和当前的启用状态不同，则调用父类的setEnabled方法，来设置整个日期选择器控件的启用状态
+     * 分别设置日期选择、分钟选择、小时选择、上午/下午选择这几个子控件的启用状态，即调用对应的setEnabled方法，并将enabled参数传入
+     * @date: 12/21/2023 12:27 AM
+     * @author: YangYizhe
+     * @param enabled
+     */
+    @Override
+    public void setEnabled(boolean enabled) {
+        if (mIsEnabled == enabled) {
+            return;
+        }
+        super.setEnabled(enabled);
+        mDateSpinner.setEnabled(enabled);
+        mMinuteSpinner.setEnabled(enabled);
+        mHourSpinner.setEnabled(enabled);
+        mAmPmSpinner.setEnabled(enabled);
+        mIsEnabled = enabled;
+    }
+    @Override
+    public boolean isEnabled() {
+        return mIsEnabled;
+    }
+
+    /**
+     * Get the current date in millis
+     *
+     * @return the current date in millis
+     */
+    public long getCurrentDateInTimeMillis() {
+        return mDate.getTimeInMillis();
+    }//实现函数——得到当前的秒数
+
+    /**
+     * Set the current date
+     *
+     * @param date The current date in millis
+     */
+    public void setCurrentDate(long date) {
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis(date);
+        setCurrentDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
+                cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE));
+    }
+
+    /**
+     * Set the current date
+     *
+     * @param year The current year
+     * @param month The current month
+     * @param dayOfMonth The current dayOfMonth
+     * @param hourOfDay The current hourOfDay
+     * @param minute The current minute
+     */
+    public void setCurrentDate(int year, int month,
+                               int dayOfMonth, int hourOfDay, int minute) {
+        setCurrentYear(year);
+        setCurrentMonth(month);
+        setCurrentDay(dayOfMonth);
+        setCurrentHour(hourOfDay);
+        setCurrentMinute(minute);
+    }
+
+    /**
+     * Get current year
+     *
+     * @return The current year
+     */
+    public int getCurrentYear() {
+        return mDate.get(Calendar.YEAR);
+    }
+
+    /**
+     * Set current year
+     *
+     * @param year The current year
+     */
+    public void setCurrentYear(int year) {
+        if (!mInitialising && year == getCurrentYear()) {
+            return;
+        }
+        mDate.set(Calendar.YEAR, year);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current month in the year
+     *
+     * @return The current month in the year
+     */
+    public int getCurrentMonth() {
+        return mDate.get(Calendar.MONTH);
+    }
+
+    /**
+     * Set current month in the year
+     *
+     * @param month The month in the year
+     */
+    public void setCurrentMonth(int month) {
+        if (!mInitialising && month == getCurrentMonth()) {
+            return;
+        }
+        mDate.set(Calendar.MONTH, month);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current day of the month
+     *
+     * @return The day of the month
+     */
+    public int getCurrentDay() {
+        return mDate.get(Calendar.DAY_OF_MONTH);
+    }
+
+    /**
+     * Set current day of the month
+     *
+     * @param dayOfMonth The day of the month
+     */
+    public void setCurrentDay(int dayOfMonth) {
+        if (!mInitialising && dayOfMonth == getCurrentDay()) {
+            return;
+        }
+        mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
+        updateDateControl();
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current hour in 24 hour mode, in the range (0~23)
+     * @return The current hour in 24 hour mode
+     */
+    public int getCurrentHourOfDay() {
+        return mDate.get(Calendar.HOUR_OF_DAY);
+    }
+
+    private int getCurrentHour() {
+        if (mIs24HourView){
+            return getCurrentHourOfDay();
+        } else {
+            int hour = getCurrentHourOfDay();
+            if (hour > HOURS_IN_HALF_DAY) {
+                return hour - HOURS_IN_HALF_DAY;
+            } else {
+                return hour == 0 ? HOURS_IN_HALF_DAY : hour;
+            }
+        }
+    }
+
+    /**
+     * Set current hour in 24 hour mode, in the range (0~23)
+     *
+     * @param hourOfDay
+     */
+    public void setCurrentHour(int hourOfDay) {
+        if (!mInitialising && hourOfDay == getCurrentHourOfDay()) {
+            return;
+        }
+        mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
+        if (!mIs24HourView) {
+            if (hourOfDay >= HOURS_IN_HALF_DAY) {
+                mIsAm = false;
+                if (hourOfDay > HOURS_IN_HALF_DAY) {
+                    hourOfDay -= HOURS_IN_HALF_DAY;
+                }
+            } else {
+                mIsAm = true;
+                if (hourOfDay == 0) {
+                    hourOfDay = HOURS_IN_HALF_DAY;
+                }
+            }
+            updateAmPmControl();
+        }
+        mHourSpinner.setValue(hourOfDay);
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get currentMinute
+     *
+     * @return The Current Minute
+     */
+    public int getCurrentMinute() {
+        return mDate.get(Calendar.MINUTE);
+    }
+
+    /**
+     * Set current minute
+     */
+    public void setCurrentMinute(int minute) {
+        if (!mInitialising && minute == getCurrentMinute()) {
+            return;
+        }
+        mMinuteSpinner.setValue(minute);
+        mDate.set(Calendar.MINUTE, minute);
+        onDateTimeChanged();
+    }
+
+    /**
+     * @return true if this is in 24 hour view else false.
+     */
+    public boolean is24HourView () {
+        return mIs24HourView;
+    }
+
+    /**
+     * Set whether in 24 hour or AM/PM mode.
+     *
+     * @param is24HourView True for 24 hour mode. False for AM/PM mode.
+     */
+    public void set24HourView(boolean is24HourView) {
+        if (mIs24HourView == is24HourView) {
+            return;
+        }
+        mIs24HourView = is24HourView;
+        mAmPmSpinner.setVisibility(is24HourView ? View.GONE : View.VISIBLE);
+        int hour = getCurrentHourOfDay();
+        updateHourControl();
+        setCurrentHour(hour);
+        updateAmPmControl();
+    }
+    /**
+     * 几个辅助方法，用于更新日期、上午/下午选择和小时选择控件的显示和属性
+     * 这些方法的作用是在选择器控件显示之前或用户改变了日期、时间模式时，更新相应控件的显示和属性，以保持界面的正确性和一致性
+     */
+    private void updateDateControl() {
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis(mDate.getTimeInMillis());
+        cal.add(Calendar.DAY_OF_YEAR, -DAYS_IN_ALL_WEEK / 2 - 1);
+        mDateSpinner.setDisplayedValues(null);
+        for (int i = 0; i < DAYS_IN_ALL_WEEK; ++i) {
+            cal.add(Calendar.DAY_OF_YEAR, 1);
+            mDateDisplayValues[i] = (String) DateFormat.format("MM.dd EEEE", cal);
+        }
+        mDateSpinner.setDisplayedValues(mDateDisplayValues);
+        mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2);
+        mDateSpinner.invalidate();
+    }
+
+    private void updateAmPmControl() {
+        if (mIs24HourView) {
+            mAmPmSpinner.setVisibility(View.GONE);
+        } else {
+            int index = mIsAm ? Calendar.AM : Calendar.PM;
+            mAmPmSpinner.setValue(index);
+            mAmPmSpinner.setVisibility(View.VISIBLE);
+        }
+    }
+
+    private void updateHourControl() {
+        if (mIs24HourView) {
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW);
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW);
+        } else {
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW);
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW);
+        }
+    }
+
+    /**
+     * Set the callback that indicates the 'Set' button has been pressed.
+     * @param callback the callback, if null will do nothing
+     */
+    public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) {
+        mOnDateTimeChangedListener = callback;
+    }
+
+    private void onDateTimeChanged() {
+        if (mOnDateTimeChangedListener != null) {
+            mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(),
+                    getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
+        }
+    }
+}

src/main/java/net/micode/notes/ui/DropdownMenu.java

@@ -0,0 +1,62 @@
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.PopupMenu;
+import android.widget.PopupMenu.OnMenuItemClickListener;
+
+import net.micode.notes.R;
+/**
+ * @Package:        net.micode.notes.ui
+ * @ClassName:      DropdownMenu
+ * @Description:
+ * DropdownMenu是一个自定义下拉菜单控件。
+ * 它使用Button作为触发器，通过PopupMenu显示菜单选项。
+ * 构造函数接收一个上下文环境、一个Button和菜单资源的ID。
+ * 通过setOnDropdownMenuItemClickListener方法设置菜单选项的点击监听器。
+ * 可以通过findItem方法查找特定的菜单选项。
+ * 通过setTitle方法设置下拉菜单的标题
+ * @Author:         YangYizhe
+ * @CreateDate:     12/21/2023 12:36 AM
+ * @Version:        1.0
+ */
+public class DropdownMenu {
+    private Button mButton;
+    private PopupMenu mPopupMenu;
+    //声明一个下拉菜单
+    private Menu mMenu;
+
+    public DropdownMenu(Context context, Button button, int menuId) {
+        mButton = button;
+        mButton.setBackgroundResource(R.drawable.dropdown_icon);
+        //设置这个view的背景
+        mPopupMenu = new PopupMenu(context, mButton);
+        mMenu = mPopupMenu.getMenu();
+        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
+        //MenuInflater是用来实例化Menu目录下的Menu布局文件
+        //根据ID来确认menu的内容选项
+        mButton.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                mPopupMenu.show();
+            }
+        });
+    }
+
+    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
+        if (mPopupMenu != null) {
+            mPopupMenu.setOnMenuItemClickListener(listener);
+        }
+    }
+
+    public MenuItem findItem(int id) {
+        return mMenu.findItem(id);
+    }//对于菜单选项的初始化，根据索引搜索菜单需要的选项
+
+    public void setTitle(CharSequence title) {
+        mButton.setText(title);
+    }//布局文件，设置标题
+}

src/main/java/net/micode/notes/ui/FoldersListAdapter.java

@@ -0,0 +1,83 @@
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CursorAdapter;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+
+/**
+ * @Package:        net.micode.notes.ui
+ * @ClassName:      FoldersListAdapter
+ * @Description:
+ * FoldersListAdapter是一个用于展示便签文件夹的列表适配器。
+ * 它继承了CursorAdapter类，主要负责便签数据库和用户界面的交互。
+ * 通过PROJECTION数组定义了需要从数据库中获取的数据列。
+ * 它通过newView方法创建文件夹视图，并通过bindView方法将布局文件和数据绑定在一起。
+ * getFolderName方法可以根据位置获取对应便签文件夹的名称
+ * @Author:         YangYizhe
+ * @CreateDate:     12/21/2023 12:37 AM
+ * @Version:        1.0
+ */
+public class FoldersListAdapter extends CursorAdapter {
+    //CursorAdapter是Cursor和ListView的接口
+    //FoldersListAdapter继承了CursorAdapter的类
+    //主要作用是便签数据库和用户的交互
+    //这里就是用folder（文件夹）的形式展现给用户
+    public static final String [] PROJECTION = {
+            NoteColumns.ID,
+            NoteColumns.SNIPPET
+    };//调用数据库中便签的ID和片段
+
+    public static final int ID_COLUMN   = 0;
+    public static final int NAME_COLUMN = 1;
+
+    public FoldersListAdapter(Context context, Cursor c) {
+        super(context, c);
+        // TODO Auto-generated constructor stub
+    }//数据库操作
+
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        //ViewGroup是容器
+        return new FolderListItem(context);
+    }//创建一个文件夹，对于各文件夹中子标签的初始化
+
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof FolderListItem) {
+            String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                    .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+            ((FolderListItem) view).bind(folderName);
+        }
+    }//将各个布局文件绑定起来
+
+    public String getFolderName(Context context, int position) {
+        Cursor cursor = (Cursor) getItem(position);
+        return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+    }//根据数据库中标签的ID得到标签的各项内容
+
+    private class FolderListItem extends LinearLayout {
+        private TextView mName;
+
+        public FolderListItem(Context context) {
+            super(context);
+            //操作数据库
+            inflate(context, R.layout.folder_list_item, this);
+            //根据布局文件的名字等信息将其找出来
+            mName = (TextView) findViewById(R.id.tv_folder_name);
+        }
+
+        public void bind(String name) {
+            mName.setText(name);
+        }
+    }
+
+}

src/main/java/net/micode/notes/ui/NoteEditText.java

@@ -0,0 +1,285 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.text.Layout;
+import android.text.Selection;
+import android.text.Spanned;
+import android.text.TextUtils;
+import android.text.style.URLSpan;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.ContextMenu;
+import android.view.KeyEvent;
+import android.view.MenuItem;
+import android.view.MenuItem.OnMenuItemClickListener;
+import android.view.MotionEvent;
+import android.widget.EditText;
+
+import net.micode.notes.R;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @Package:        net.micode.notes.ui
+ * @ClassName:      NoteEditText
+ * @Description:    
+ * @Author:         YangYizhe
+ * @CreateDate:     12/21/2023 12:38 AM
+ * @Version:        1.0
+ */
+public class NoteEditText extends EditText {
+    //常量标识
+    private static final String TAG = "NoteEditText";
+    //声明整型变量，文本索引
+    private int mIndex;
+    //声明整型变量
+    private int mSelectionStartBeforeDelete;
+
+    //声明字符串常量，标志电话、网址、邮件
+    private static final String SCHEME_TEL = "tel:" ;
+    private static final String SCHEME_HTTP = "http:" ;
+    private static final String SCHEME_EMAIL = "mailto:" ;
+
+    //设置映射，将文本内容（电话、网址、邮件）做链接处理
+    private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>();
+    static {
+        sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel);
+        sSchemaActionResMap.put(SCHEME_HTTP, R.string.note_link_web);
+        sSchemaActionResMap.put(SCHEME_EMAIL, R.string.note_link_email);
+    }
+
+    /**
+     * Call by the {@link NoteEditActivity} to delete or add edit text
+     * 该接口用于实现对TextView组件中的文字信息进行修改
+     */
+    public interface OnTextViewChangeListener {
+        /**
+         * Delete current edit text when {@link KeyEvent#KEYCODE_DEL} happens
+         * and the text is null
+         * 当delete键按下时删除当前编辑的文字块
+         */
+        void onEditTextDelete(int index, String text);
+
+        /**
+         * Add edit text after current edit text when {@link KeyEvent#KEYCODE_ENTER}
+         * happen
+         * 当enter键按下时添加一个文字编辑块
+         */
+        void onEditTextEnter(int index, String text);
+
+        /**
+         * Hide or show item option when text change
+         * 当文字发生变化时隐藏或者显示设置
+         */
+        void onTextChange(int index, boolean hasText);
+    }
+
+    //声明文本视图变化监听器
+    private OnTextViewChangeListener mOnTextViewChangeListener;
+
+    /**
+     * 构造方法，实例化NoteEditText
+     */
+    public NoteEditText(Context context) {
+        super(context, null);
+        mIndex = 0;
+    }
+
+    //设置索引号
+    public void setIndex(int index) {
+        mIndex = index;
+    }
+
+    /**
+     * 设置文本视图变化监听器
+    */
+     public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
+        mOnTextViewChangeListener = listener;
+    }
+
+    /**
+     * 构造方法，是由参数集（文本编辑风格）实例化NoteEditText
+    */
+     public NoteEditText(Context context, AttributeSet attrs) {
+        super(context, attrs, android.R.attr.editTextStyle);
+    }
+    /**
+     * 构造方法，是由参数集（文本编辑风格、定义风格）实例化NoteEditText
+    */
+     public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        // TODO Auto-generated constructor stub
+    }
+
+    /**
+     * @method  onTouchEvent
+     * @description 处理触摸事件，根据触摸点的位置设置光标的位置
+     * @date: 12/21/2023 12:41 AM
+     * @author: YangYizhe
+     * @param 
+     * @return 
+     */
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+
+                int x = (int) event.getX();
+                int y = (int) event.getY();
+                x -= getTotalPaddingLeft();
+                y -= getTotalPaddingTop();
+                x += getScrollX();
+                y += getScrollY();
+                Layout layout = getLayout();
+                int line = layout.getLineForVertical(y);
+                int off = layout.getOffsetForHorizontal(line, x);
+                Selection.setSelection(getText(), off);
+                break;
+        }
+        return super.onTouchEvent(event);
+    }
+    /**
+     * @method  onKeyDown
+     * @description 监听键盘按键按下
+     * @date: 12/21/2023 12:40 AM
+     * @author: YangYizhe
+     * @param keyCode 键盘按键的编码
+     * @param event 按键事件
+     * @return boolean
+     */
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_ENTER:
+                if (mOnTextViewChangeListener != null) {
+                    return false;
+                }
+                break;
+            case KeyEvent.KEYCODE_DEL:
+                mSelectionStartBeforeDelete = getSelectionStart();
+                break;
+            default:
+                break;
+        }
+        return super.onKeyDown(keyCode, event);
+    }
+
+    /**
+     * @method  onKeyUp
+     * @description 监听按键抬起
+     * @date: 12/21/2023 12:39 AM
+     * @author: YangYizhe
+     * @param keyCode
+     * @param event
+     */
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        switch(keyCode) {
+            case KeyEvent.KEYCODE_DEL:
+                if (mOnTextViewChangeListener != null) {
+                    if (0 == mSelectionStartBeforeDelete && mIndex != 0) {
+                        mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString());
+                        return true;
+                    }
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted");
+                }
+                break;
+            case KeyEvent.KEYCODE_ENTER:
+                if (mOnTextViewChangeListener != null) {
+                    int selectionStart = getSelectionStart();
+                    String text = getText().subSequence(selectionStart, length()).toString();
+                    setText(getText().subSequence(0, selectionStart));
+                    mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text);
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted");
+                }
+                break;
+            default:
+                break;
+        }
+        return super.onKeyUp(keyCode, event);
+    }
+
+    /**
+     * @method  onFocusChanged
+     * @description 处理当前视图下的焦点改变事件
+     * @date: 12/21/2023 12:39 AM
+     * @author: YangYizhe
+     * @param focused 代表获得或失去焦点
+     * @param direction
+     * @param previouslyFocusedRect 上一个访问的焦点区域
+     */
+    @Override
+    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
+        if (mOnTextViewChangeListener != null) {
+            if (!focused && TextUtils.isEmpty(getText())) {
+                mOnTextViewChangeListener.onTextChange(mIndex, false);
+            } else {
+                mOnTextViewChangeListener.onTextChange(mIndex, true);
+            }
+        }
+        super.onFocusChanged(focused, direction, previouslyFocusedRect);
+    }
+
+    /**
+     * @method  onCreateContextMenu
+     * @description 
+     * @date: 12/21/2023 12:39 AM
+     * @author: YangYizhe
+     * @param 
+     * @return 
+     */
+    @Override
+    protected void onCreateContextMenu(ContextMenu menu) {
+        if (getText() instanceof Spanned) {
+            int selStart = getSelectionStart();
+            int selEnd = getSelectionEnd();
+
+            int min = Math.min(selStart, selEnd);
+            int max = Math.max(selStart, selEnd);
+
+            final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class);
+            if (urls.length == 1) {
+                int defaultResId = 0;
+                for(String schema: sSchemaActionResMap.keySet()) {
+                    if(urls[0].getURL().indexOf(schema) >= 0) {
+                        defaultResId = sSchemaActionResMap.get(schema);
+                        break;
+                    }
+                }
+
+                if (defaultResId == 0) {
+                    defaultResId = R.string.note_link_other;
+                }
+                menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener(
+                        new OnMenuItemClickListener() {
+                            public boolean onMenuItemClick(MenuItem item) {
+                                // goto a new intent
+                                urls[0].onClick(NoteEditText.this);
+                                return true;
+                            }
+                        });
+            }
+        }
+        super.onCreateContextMenu(menu);
+    }
+}

src/main/java/net/micode/notes/ui/NotesPreferenceActivity.java

@@ -0,0 +1,492 @@
+package net.micode.notes.ui;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.app.ActionBar;
+import android.app.AlertDialog;
+import android.content.BroadcastReceiver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.preference.Preference;
+import android.preference.Preference.OnPreferenceClickListener;
+import android.preference.PreferenceActivity;
+import android.preference.PreferenceCategory;
+import android.text.TextUtils;
+import android.text.format.DateFormat;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.remote.GTaskSyncService;
+
+/**
+ * @Package:        net.micode.notes.ui
+ * @ClassName:      NotesPreferenceActivity
+ * @Description:
+ * NotesPreferenceActivity，在小米便签中主要实现的是对背景颜色和字体大小的数据储存。
+ * 继承了PreferenceActivity主要功能为对系统信息和配置进行自动保存的Activity
+ * @Author:         YangYizhe
+ * @CreateDate:     12/23/2023 11:42 PM
+ * @Version:        1.0
+ */
+public class NotesPreferenceActivity extends PreferenceActivity {
+    public static final String PREFERENCE_NAME = "notes_preferences";//优先名
+    public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name";//同步账号
+    public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time";//同步时间
+    public static final String PREFERENCE_SET_BG_COLOR_KEY = "pref_key_bg_random_appear";
+    private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key";//同步密码
+    private static final String AUTHORITIES_FILTER_KEY = "authorities";
+    private PreferenceCategory mAccountCategory;//账户分组
+    private GTaskReceiver mReceiver;//同步任务接收器
+    private Account[] mOriAccounts;//账户
+    private boolean mHasAddedAccount;//账户的hash标记
+
+    @Override
+    /**
+     * @method  onCreate
+     * @description 创建一个activity，在函数里要完成所有的正常静态设置
+     * @date: 12/23/2023 11:43 PM
+     * @author: YangYizhe
+     * @param [icicle]
+     * @return void
+     */
+    protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+        /* using the app icon for navigation */
+        getActionBar().setDisplayHomeAsUpEnabled(true);//给左上角图标的左边加上一个返回的图标
+        addPreferencesFromResource(R.xml.preferences);//添加xml来源并显示 xml
+        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);//根据同步账户关键码来初始化分组
+        mReceiver = new GTaskReceiver();
+        IntentFilter filter = new IntentFilter();
+        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);
+        registerReceiver(mReceiver, filter);//初始化同步组件
+        mOriAccounts = null;
+        View header = LayoutInflater.from(this).inflate(R.layout.settings_header, null);//获取listvivew，ListView的作用:用于列出所有选择
+        getListView().addHeaderView(header, null, true);//在listview组件上方添加其他组件
+    }
+
+    @Override
+    /**
+     * @method  onResume
+     * @description activity交互功能的实现，用于接受用户的输入
+     * @date: 12/23/2023 11:44 PM
+     * @author: YangYizhe
+     * @return void
+     */
+    protected void onResume() {
+        super.onResume();
+
+        // need to set sync account automatically if user has added a new
+        // account
+        if (mHasAddedAccount) {
+            //若用户新加了账户则自动设置同步账户
+            Account[] accounts = getGoogleAccounts();//获取google同步账户
+            if (mOriAccounts != null && accounts.length > mOriAccounts.length) {
+                //若原账户不为空且当前账户有增加
+                for (Account accountNew : accounts) {
+                    boolean found = false;
+                    for (Account accountOld : mOriAccounts) {
+                        if (TextUtils.equals(accountOld.name, accountNew.name)) {
+                            //更新账户
+                            found = true;
+                            break;
+                        }
+                    }
+                    if (!found) {
+                        setSyncAccount(accountNew.name);
+                        //若是没有找到旧的账户，那么同步账号中就只添加新账户
+                        break;
+                    }
+                }
+            }
+        }
+
+        refreshUI();//刷新标签界面
+    }
+
+    @Override
+    protected void onDestroy() {
+        if (mReceiver != null) {
+            unregisterReceiver(mReceiver);//注销接收器
+        }
+        super.onDestroy();//执行父类的销毁动作
+    }
+
+    /**
+     * @method  loadAccountPreference
+     * @description 重新设置账户信息
+     * @date: 12/23/2023 11:45 PM
+     * @author: YangYizhe
+     * @param
+     * @return
+     */
+    private void loadAccountPreference() {
+        mAccountCategory.removeAll();//销毁所有的分组
+        Preference accountPref = new Preference(this);//建立首选项
+        final String defaultAccount = getSyncAccountName(this);
+        accountPref.setTitle(getString(R.string.preferences_account_title));
+        accountPref.setSummary(getString(R.string.preferences_account_summary));//设置首选项的大标题和小标题
+        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
+            public boolean onPreferenceClick(Preference preference) {
+                //建立监听器
+                if (!GTaskSyncService.isSyncing()) {
+                    if (TextUtils.isEmpty(defaultAccount)) {
+                        // the first time to set account
+                        //若是第一次建立账户显示选择账户提示对话框
+                        showSelectAccountAlertDialog();
+                    } else {
+                        // if the account has already been set, we need to promp
+                        // user about the risk
+                        //若是已经建立则显示修改对话框并进行修改操作
+                        showChangeAccountConfirmAlertDialog();
+                    }
+                } else {
+                    //若在没有同步的情况下，则在toast中显示不能修改
+                    Toast.makeText(NotesPreferenceActivity.this,
+                                    R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT)
+                            .show();
+                }
+                return true;
+            }
+        });
+        mAccountCategory.addPreference(accountPref);//根据新建首选项编辑新的账户分组
+    }
+    /**
+     * @method  loadSyncButton
+     * @description 设置按键的状态和最后同步的时间
+     * @date: 12/23/2023 11:46 PM
+     * @author: YangYizhe
+     * @param
+     * @return
+     */
+    private void loadSyncButton() {
+        Button syncButton = (Button) findViewById(R.id.preference_sync_button);
+        TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+        //获取同步按钮控件和最终同步时间的的窗口
+        // set button state
+        //设置按钮的状态
+        if (GTaskSyncService.isSyncing()) {
+            //若是在同步状态下
+            syncButton.setText(getString(R.string.preferences_button_sync_cancel));
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.cancelSync(NotesPreferenceActivity.this);
+                }
+            });//设置按钮显示的文本为“取消同步”以及监听器
+        } else {
+            syncButton.setText(getString(R.string.preferences_button_sync_immediately));
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.startSync(NotesPreferenceActivity.this);
+                }
+            });//若是不同步则设置按钮显示的文本为“立即同步”以及对应监听器
+        }
+        syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));//设置按键可用还是不可用
+        // set last sync time
+        // 设置最终同步时间
+        if (GTaskSyncService.isSyncing()) {
+            //若是在同步的情况下
+            lastSyncTimeView.setText(GTaskSyncService.getProgressString());
+            lastSyncTimeView.setVisibility(View.VISIBLE);
+            // 根据当前同步服务器设置时间显示框的文本以及可见性
+        } else {
+            //若是非同步情况
+            long lastSyncTime = getLastSyncTime(this);
+            if (lastSyncTime != 0) {
+                lastSyncTimeView.setText(getString(R.string.preferences_last_sync_time,
+                        DateFormat.format(getString(R.string.preferences_last_sync_time_format),
+                                lastSyncTime)));
+                lastSyncTimeView.setVisibility(View.VISIBLE);
+                //则根据最后同步时间的信息来编辑时间显示框的文本内容和可见性
+            } else {
+                //若时间为空直接设置为不可见状态
+                lastSyncTimeView.setVisibility(View.GONE);
+            }
+        }
+    }
+    /**
+     * @method  refreshUI
+     * @description
+     * 刷新标签界面
+     * 调用上文设置账号和设置按键两个函数来实现
+     * @date: 12/23/2023 11:46 PM
+     * @author: YangYizhe
+     */
+    private void refreshUI() {
+        loadAccountPreference();
+        loadSyncButton();
+    }
+    /**
+     * @method  showSelectAccountAlertDialog
+     * @description 显示账户选择的对话框并进行账户的设置
+     * @date: 12/23/2023 11:47 PM
+     * @author: YangYizhe
+     * @param
+     * @return
+     */
+    private void showSelectAccountAlertDialog() {
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);//创建一个新的对话框
+
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
+        titleTextView.setText(getString(R.string.preferences_dialog_select_account_title));
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
+        subtitleTextView.setText(getString(R.string.preferences_dialog_select_account_tips));//设置标题以及子标题的内容
+        dialogBuilder.setCustomTitle(titleView);
+        dialogBuilder.setPositiveButton(null, null);//设置对话框的自定义标题，建立一个YES的按钮
+        Account[] accounts = getGoogleAccounts();
+        String defAccount = getSyncAccountName(this);//获取同步账户信息
+        mOriAccounts = accounts;
+        mHasAddedAccount = false;
+
+        if (accounts.length > 0) {
+            //若账户不为空
+            CharSequence[] items = new CharSequence[accounts.length];
+            final CharSequence[] itemMapping = items;
+            int checkedItem = -1;
+            int index = 0;
+            for (Account account : accounts) {
+                if (TextUtils.equals(account.name, defAccount)) {
+                    checkedItem = index;//在账户列表中查询到所需账户
+                }
+                items[index++] = account.name;
+            }
+            dialogBuilder.setSingleChoiceItems(items, checkedItem,
+                    //在对话框建立一个单选的复选框
+                    new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int which) {
+                            setSyncAccount(itemMapping[which].toString());
+                            dialog.dismiss();//取消对话框
+                            refreshUI();
+                        }
+                    });//建立对话框网络版的监听器
+        }
+
+        View addAccountView = LayoutInflater.from(this).inflate(R.layout.add_account_text, null);
+        dialogBuilder.setView(addAccountView);//给新加账户对话框设置自定义样式
+
+        final AlertDialog dialog = dialogBuilder.show();//显示对话框
+        addAccountView.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                mHasAddedAccount = true;
+                //将新加账户的hash置true
+                Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS");
+                //建立网络建立组件
+                intent.putExtra(AUTHORITIES_FILTER_KEY, new String[] {
+                        "gmail-ls"
+                });
+                startActivityForResult(intent, -1);
+                //跳回上一个选项
+                dialog.dismiss();
+            }
+        });//建立新加账户对话框的监听器
+    }
+    /**
+     * @method  showChangeAccountConfirmAlertDialog
+     * @description 显示账户选择对话框和相关账户操作
+     * @date: 12/23/2023 11:48 PM
+     * @author: YangYizhe
+     */
+    private void showChangeAccountConfirmAlertDialog() {
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);//创建一个新的对话框
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
+        titleTextView.setText(getString(R.string.preferences_dialog_change_account_title,
+                getSyncAccountName(this)));
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
+        subtitleTextView.setText(getString(R.string.preferences_dialog_change_account_warn_msg));//根据同步修改的账户信息设置标题以及子标题的内容
+        dialogBuilder.setCustomTitle(titleView);//设置对话框的自定义标题
+        CharSequence[] menuItemArray = new CharSequence[] {
+                getString(R.string.preferences_menu_change_account),
+                getString(R.string.preferences_menu_remove_account),
+                getString(R.string.preferences_menu_cancel)
+        };
+        dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() {
+            //设置对话框要显示的一个list，用于显示几个命令时,即change，remove，cancel
+            public void onClick(DialogInterface dialog, int which) {
+                //按键功能，由which来决定
+                if (which == 0) {
+                    //进入账户选择对话框
+                    showSelectAccountAlertDialog();
+                } else if (which == 1) {
+                    //删除账户并且跟新便签界面
+                    removeSyncAccount();
+                    refreshUI();
+                }
+            }
+        });
+        dialogBuilder.show();//显示对话框
+    }
+
+    /**
+     * @method  getGoogleAccounts
+     * @description
+     * 获取谷歌账户
+     * 通过账户管理器直接获取
+     * @date: 12/23/2023 11:49 PM
+     * @author: YangYizhe
+     */
+    private Account[] getGoogleAccounts() {
+        AccountManager accountManager = AccountManager.get(this);
+        return accountManager.getAccountsByType("com.google");
+    }
+
+    /**
+     * @method  setSyncAccount
+     * @description 设置同步账户
+     * @date: 12/23/2023 11:49 PM
+     * @author: YangYizhe
+     * @param account
+     */
+    private void setSyncAccount(String account) {
+        if (!getSyncAccountName(this).equals(account)) {
+            //假如该账号不在同步账号列表中
+            SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
+            SharedPreferences.Editor editor = settings.edit();//编辑共享的首选项
+            if (account != null) {
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, account);
+            } else {
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
+            }//将该账号加入到首选项中
+
+            editor.commit();//提交修改的数据
+            setLastSyncTime(this, 0);//将最后同步时间清零
+
+            // clean up local gtask related info
+            new Thread(new Runnable() {
+                public void run() {
+                    ContentValues values = new ContentValues();
+                    values.put(NoteColumns.GTASK_ID, "");
+                    values.put(NoteColumns.SYNC_ID, 0);
+                    getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
+                }
+            }).start();
+            //重置当地同步任务的信息
+
+            Toast.makeText(NotesPreferenceActivity.this,
+                    getString(R.string.preferences_toast_success_set_accout, account),
+                    Toast.LENGTH_SHORT).show();
+            //将toast的文本信息置为“设置账户成功”并显示出来
+        }
+    }
+    /**
+     * @method  removeSyncAccount
+     * @description 删除同步账户
+     * @date: 12/23/2023 11:49 PM
+     * @author: YangYizhe
+     */
+    private void removeSyncAccount() {
+        SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
+        SharedPreferences.Editor editor = settings.edit();//设置共享首选项
+
+        if (settings.contains(PREFERENCE_SYNC_ACCOUNT_NAME)) {
+            editor.remove(PREFERENCE_SYNC_ACCOUNT_NAME);//假如当前首选项中有账户就删除
+        }
+        if (settings.contains(PREFERENCE_LAST_SYNC_TIME)) {
+            editor.remove(PREFERENCE_LAST_SYNC_TIME);//删除当前首选项中有账户时间
+        }
+        editor.commit();//提交更新后的数据
+
+        // clean up local gtask related info
+        new Thread(new Runnable() {
+            public void run() {
+                ContentValues values = new ContentValues();
+                values.put(NoteColumns.GTASK_ID, "");
+                values.put(NoteColumns.SYNC_ID, 0);
+                getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
+            }
+        }).start();
+        //重置当地同步任务的信息
+    }
+    /**
+     * @method  getSyncAccountName
+     * @description
+     * 获取同步账户名称
+     * 通过共享的首选项里的信息直接获取
+     * @date: 12/23/2023 11:50 PM
+     * @author: YangYizhe
+     * @param context
+     */
+    public static String getSyncAccountName(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        return settings.getString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
+    }
+    /**
+     * @method  setLastSyncTime
+     * @description 设置最终同步的时间
+     * @date: 12/23/2023 11:50 PM
+     * @author: YangYizhe
+     * @param
+     * @return
+     */
+    public static void setLastSyncTime(Context context, long time) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        SharedPreferences.Editor editor = settings.edit();// 从共享首选项中找到相关账户并获取其编辑器
+        editor.putLong(PREFERENCE_LAST_SYNC_TIME, time);
+        editor.commit();//编辑最终同步时间并提交更新
+    }
+    /**
+     * @method  getLastSyncTime
+     * @description
+     * 获取最终同步时间
+     * 通过共享的首选项里的信息直接获取
+     * @date: 12/23/2023 11:51 PM
+     * @author: YangYizhe
+     * @param context
+     */
+    public static long getLastSyncTime(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
+                Context.MODE_PRIVATE);
+        return settings.getLong(PREFERENCE_LAST_SYNC_TIME, 0);
+    }
+
+    private class GTaskReceiver extends BroadcastReceiver {
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            refreshUI();
+            if (intent.getBooleanExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_IS_SYNCING, false)) {
+                //获取随广播而来的Intent中的同步服务的数据
+                TextView syncStatus = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
+                syncStatus.setText(intent
+                        .getStringExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_PROGRESS_MSG));//通过获取的数据在设置系统的状态
+            }
+
+        }
+    }
+    /**
+     * @method  onOptionsItemSelected
+     * @description 处理菜单的选项
+     * @date: 12/23/2023 11:52 PM
+     * @author: YangYizhe
+     * @param item
+     */
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            //根据选项的id选择，这里只有一个主页
+            case android.R.id.home:
+                Intent intent = new Intent(this, NotesListActivity.class);
+                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                startActivity(intent);
+                return true;
+            //在主页情况下在创建连接组件intent，发出清空的信号并开始一个相应的activity
+            default:
+                return false;
+        }
+    }
+}
+ 

src/main/res/values/strings.xml

@@ -126,10 +126,71 @@
     <string name="search">Notes</string>
     <string name="datetime_dialog_ok">set</string>
     <string name="datetime_dialog_cancel">cancel</string>
+
+    <string name="light_mode">light mode</string>
+    <string name="dark_mode">dark mode</string>
+    <!-- secret mode -->
+    <string name="menu_secret">secret mode</string>
+    <string name="menu_quit_secret">quit secret mode</string>
+
+    <string name="note_length">length</string>
+    <string name="menu_restore">restore</string>
+
+    <string name="title_activity_splash">SplashActivity</string>
+    <string name="eazzy_note">EAZZY\nNOTE</string>
+
     <plurals name="search_results_title">
          <item quantity="one"><xliff:g id="number" example="1">%1$s</xliff:g> result for \"<xliff:g id="search" example="???">%2$s</xliff:g>\"</item>
         <!-- Case of 0 or 2 or more results. -->
         <item quantity="other"><xliff:g id="number" example="15">%1$s</xliff:g> results for \"<xliff:g id="search" example="???">%2$s</xliff:g>\"</item>
     </plurals>
 
+    <style name="HighlightTextAppearancePrimary">
+    <item name="android:textSize">@dimen/text_font_size_normal</item>
+        <item name="android:textColor">@color/primary_text_dark</item>
+    </style>
+    <style name="HighlightTextAppearanceSecondary">
+        <item name="android:textSize">@dimen/text_font_size_small</item>
+        <item name="android:textColor">@color/secondary_text_dark</item>
+    </style>
+    <style name="NoteActionBarStyle" parent="@android:style/Widget.Holo.Light.ActionBar.Solid">
+        <item name="android:displayOptions"/>
+        <item name="android:visibility">visible</item>
+    </style>
+    <style name="NoteTheme" parent="@android:style/Theme.Holo.Light">
+        <item name="android:actionBarStyle">@style/NoteActionBarStyle</item>
+    </style>
+    <style name="TextAppearanceLarge">
+        <item name="android:textSize">@dimen/text_font_size_large</item>
+        <item name="android:textColorLink">#0000ff</item>
+    </style>
+    <style name="TextAppearanceMedium">
+        <item name="android:textSize">@dimen/text_font_size_medium</item>
+        <item name="android:textColorLink">#0000ff</item>
+    </style>
+    <style name="TextAppearanceNormal">
+        <item name="android:textSize">@dimen/text_font_size_normal</item>
+        <item name="android:textColorLink">#0000ff</item>
+    </style>
+    <style name="TextAppearancePrimaryItem">
+        <item name="android:textSize">@dimen/text_font_size_normal</item>
+        <item name="android:textColor">@color/primary_text_dark</item>
+    </style>
+    <style name="TextAppearanceSecondaryItem">
+        <item name="android:textSize">@dimen/text_font_size_small</item>
+        <item name="android:textColor">@color/secondary_text_dark</item>
+    </style>
+    <style name="TextAppearanceSuper">
+        <item name="android:textSize">@dimen/text_font_size_super</item>
+        <item name="android:textColorLink">#0000ff</item>
+    </style>
+    <style name="TextAppearanceUnderMenuIcon">
+        <item name="android:textSize">@dimen/text_font_size_normal</item>
+        <item name="android:textColor">@android:color/black</item>
+    </style>
+    <plurals name="search_results_title">
+         <item quantity="one"><xliff:g id="number" example="1">%1$s</xliff:g> result for \"<xliff:g id="search" example="???">%2$s</xliff:g>\"</item>
+        <!-- Case of 0 or 2 or more results. -->
+        <item quantity="other"><xliff:g id="number" example="15">%1$s</xliff:g> results for \"<xliff:g id="search" example="???">%2$s</xliff:g>\"</item>
+    </plurals>
 </resources>

src/main/res/values/styles.xml

@@ -66,4 +66,12 @@
         <item name="android:displayOptions" />
         <item name="android:visibility">visible</item>
     </style>
+    <style name="Widget.Theme.Notes.ActionBar.Fullscreen" parent="Widget.AppCompat.ActionBar">
+        <item name="android:background">@color/black_overlay</item>
+    </style>
+
+    <style name="Widget.Theme.Notes.ButtonBar.Fullscreen" parent="">
+        <item name="android:background">@color/black_overlay</item>
+        <item name="android:buttonBarStyle">?android:attr/buttonBarStyle</item>
+    </style>
 </resources>