diff --git a/src/Notes-master/src/net/micode/notes/ui/NotesListItem.java b/src/Notes-master/src/net/micode/notes/ui/NotesListItem.java index 1221e80..9fd64c4 100644 --- a/src/Notes-master/src/net/micode/notes/ui/NotesListItem.java +++ b/src/Notes-master/src/net/micode/notes/ui/NotesListItem.java @@ -15,7 +15,7 @@ */ package net.micode.notes.ui; - + import android.content.Context; import android.text.format.DateUtils; import android.view.View; @@ -23,46 +23,53 @@ import android.widget.CheckBox; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; - + import net.micode.notes.R; import net.micode.notes.data.Notes; import net.micode.notes.tool.DataUtils; import net.micode.notes.tool.ResourceParser.NoteItemBgResources; - - + + +//功能：创建便签列表项目选项 public class NotesListItem extends LinearLayout { - private ImageView mAlert; - private TextView mTitle; - private TextView mTime; - private TextView mCallName; - private NoteItemData mItemData; - private CheckBox mCheckBox; - + private ImageView mAlert;//闹钟图片 + private TextView mTitle; //标题 + private TextView mTime; //时间 + private TextView mCallName; //名称 + private NoteItemData mItemData; //标签数据 + private CheckBox mCheckBox; //打钩框 + + /* + * 初始化基本信息 + */ public NotesListItem(Context context) { - super(context); - inflate(context, R.layout.note_item, this); - mAlert = (ImageView) findViewById(R.id.iv_alert_icon); + super(context); //super()的主要作用是调整调用父类构造函数的顺序 + inflate(context, R.layout.note_item, this);//Inflate可用于将一个xml中定义的布局控件找出来,这里的xml是r.layout + mAlert = (ImageView) findViewById(R.id.iv_alert_icon);//findViewById用于从contentView中查找指定ID的View，转换出来的形式根据需要而定; mTitle = (TextView) findViewById(R.id.tv_title); mTime = (TextView) findViewById(R.id.tv_time); mCallName = (TextView) findViewById(R.id.tv_name); mCheckBox = (CheckBox) findViewById(android.R.id.checkbox); } - + ///根据data的属性对各个控件的属性的控制，主要是可见性Visibility，内容setText，格式setTextAppearance public void bind(Context context, NoteItemData data, boolean choiceMode, boolean checked) { if (choiceMode && data.getType() == Notes.TYPE_NOTE) { - mCheckBox.setVisibility(View.VISIBLE); - mCheckBox.setChecked(checked); + mCheckBox.setVisibility(View.VISIBLE); //设置可见行为 + mCheckBox.setChecked(checked);//给格子打钩 } else { mCheckBox.setVisibility(View.GONE); } - + mItemData = data; + + //下面的语句块设置控件属性，一共三种情况，由data的id和父id是否与保存到文件夹的id一致来决定 if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) { mCallName.setVisibility(View.GONE); mAlert.setVisibility(View.VISIBLE); - mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem); + mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem);//设置该textview的style + mTitle.setText(context.getString(R.string.call_record_folder_name) - + context.getString(R.string.format_folder_files_count, data.getNotesCount())); + + context.getString(R.string.format_folder_files_count, data.getNotesCount()));//settext为设置内容 mAlert.setImageResource(R.drawable.call_record); } else if (data.getParentId() == Notes.ID_CALL_RECORD_FOLDER) { mCallName.setVisibility(View.VISIBLE); @@ -70,7 +77,7 @@ public class NotesListItem extends LinearLayout { mTitle.setTextAppearance(context,R.style.TextAppearanceSecondaryItem); mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet())); if (data.hasAlert()) { - mAlert.setImageResource(R.drawable.clock); + mAlert.setImageResource(R.drawable.clock);//图片来源的设置 mAlert.setVisibility(View.VISIBLE); } else { mAlert.setVisibility(View.GONE); @@ -78,7 +85,6 @@ public class NotesListItem extends LinearLayout { } else { mCallName.setVisibility(View.GONE); mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem); - if (data.getType() == Notes.TYPE_FOLDER) { mTitle.setText(data.getSnippet() + context.getString(R.string.format_folder_files_count, @@ -94,29 +100,33 @@ public class NotesListItem extends LinearLayout { } } } - mTime.setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate())); - + + mTime. setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate()));//获取相关时间，从data里编辑的日期中获取 + setBackground(data); } + //根据data的文件属性来设置背景 private void setBackground(NoteItemData data) { int id = data.getBgColorId(); + //若是note型文件，对于4种不同情况的背景来源的处理 if (data.getType() == Notes.TYPE_NOTE) { + if (data.isSingle() || data.isOneFollowingFolder()) { - setBackgroundResource(NoteItemBgResources.getNoteBgSingleRes(id)); + setBackgroundResource(NoteItemBgResources.getNoteBgSingleRes(id));//单个数据并且只有一个子文件夹 } else if (data.isLast()) { - setBackgroundResource(NoteItemBgResources.getNoteBgLastRes(id)); + setBackgroundResource(NoteItemBgResources.getNoteBgLastRes(id));//是最后一个数据 } else if (data.isFirst() || data.isMultiFollowingFolder()) { - setBackgroundResource(NoteItemBgResources.getNoteBgFirstRes(id)); + setBackgroundResource(NoteItemBgResources.getNoteBgFirstRes(id));//是一个数据并有多个子文件夹 } else { setBackgroundResource(NoteItemBgResources.getNoteBgNormalRes(id)); } } else { - setBackgroundResource(NoteItemBgResources.getFolderBgRes()); + + setBackgroundResource(NoteItemBgResources.getFolderBgRes());//若不是note直接调用文件夹的背景来源 } } - public NoteItemData getItemData() { return mItemData; } -} +} \ No newline at end of file diff --git a/src/Notes-master/src/net/micode/notes/ui/NotesPreferenceActivity.java b/src/Notes-master/src/net/micode/notes/ui/NotesPreferenceActivity.java index 07c5f7e..69429b2 100644 --- a/src/Notes-master/src/net/micode/notes/ui/NotesPreferenceActivity.java +++ b/src/Notes-master/src/net/micode/notes/ui/NotesPreferenceActivity.java @@ -15,7 +15,7 @@ */ package net.micode.notes.ui; - + import android.accounts.Account; import android.accounts.AccountManager; import android.app.ActionBar; @@ -41,70 +41,92 @@ 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; - - + +/* + *功能：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 + */ public class NotesPreferenceActivity extends PreferenceActivity { - public static final String PREFERENCE_NAME = "notes_preferences"; - - public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name"; - - public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time"; - + 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"; - - private static final String AUTHORITIES_FILTER_KEY = "authorities"; - - private PreferenceCategory mAccountCategory; - - private GTaskReceiver mReceiver; - - private Account[] mOriAccounts; - - private boolean mHasAddedAccount; - + + private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key";//同步密码 + + private static final String AUTHORITIES_FILTER_KEY = "authorities";//本地密码 + + 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 + /* + *功能：创建一个activity，在函数里要完成所有的正常静态设置 + *参数：Bundle icicle：存放了 activity 当前的状态 + */ protected void onCreate(Bundle icicle) { - super.onCreate(icicle); + + super.onCreate(icicle);//先执行父类的创建函数 + + 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 - /* using the app icon for navigation */ - getActionBar().setDisplayHomeAsUpEnabled(true); - addPreferencesFromResource(R.xml.preferences); - mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY); + //初始化同步组件 mReceiver = new GTaskReceiver(); IntentFilter filter = new IntentFilter(); filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME); registerReceiver(mReceiver, filter); - + + mOriAccounts = null; View header = LayoutInflater.from(this).inflate(R.layout.settings_header, null); - getListView().addHeaderView(header, null, true); + + getListView().addHeaderView(header, null, true);//获取listvivew，并在listview组件上方添加其他组件 } - + @Override + /* + * 功能：activity交互功能的实现，用于接受用户的输入 + */ protected void onResume() { - super.onResume(); - - // need to set sync account automatically if user has added a new - // account + + super.onResume();//先执行父类的交互实现 + + // 如果用户添加了新帐户，则需要自动设置同步帐户 if (mHasAddedAccount) { - Account[] accounts = getGoogleAccounts(); + Account[] accounts = getGoogleAccounts();//获取google同步账户 + + //若原账户不为空且当前账户有增加 if (mOriAccounts != null && accounts.length > mOriAccounts.length) { - for (Account accountNew : accounts) { + for (Account accountNew : accounts) { boolean found = false; for (Account accountOld : mOriAccounts) { + + //更新账户 if (TextUtils.equals(accountOld.name, accountNew.name)) { found = true; break; } } + //若是没有找到旧的账户，那么同步账号中就只添加新账户 if (!found) { setSyncAccount(accountNew.name); break; @@ -112,74 +134,86 @@ public class NotesPreferenceActivity extends PreferenceActivity { } } } - - refreshUI(); + + refreshUI();//刷新标签界面 } - + @Override + /* + * 函数功能：销毁一个activity + */ protected void onDestroy() { if (mReceiver != null) { - unregisterReceiver(mReceiver); + unregisterReceiver(mReceiver);//注销接收器 } - super.onDestroy(); + super.onDestroy();//执行父类的销毁动作 } - + + /* + * 函数功能：重新设置账户信息 + */ private void loadAccountPreference() { - mAccountCategory.removeAll(); + mAccountCategory.removeAll();//销毁所有的分组 + Preference accountPref = new Preference(this);//建立首选项 - Preference accountPref = new Preference(this); + //设置首选项的大标题和小标题 final String defaultAccount = getSyncAccountName(this); accountPref.setTitle(getString(R.string.preferences_account_title)); accountPref.setSummary(getString(R.string.preferences_account_summary)); + + //建立监听器 accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() { public boolean onPreferenceClick(Preference preference) { if (!GTaskSyncService.isSyncing()) { if (TextUtils.isEmpty(defaultAccount)) { - // the first time to set account - showSelectAccountAlertDialog(); + showSelectAccountAlertDialog();//若是第一次建立账户显示选择账户提示对话框 } else { - // if the account has already been set, we need to promp - // user about the risk - showChangeAccountConfirmAlertDialog(); + showChangeAccountConfirmAlertDialog();//若是已经建立则显示修改对话框并进行修改操作 } } else { Toast.makeText(NotesPreferenceActivity.this, R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT) - .show(); + .show();//若在没有同步的情况下，则在toast中显示不能修改 } return true; } }); - mAccountCategory.addPreference(accountPref); + mAccountCategory.addPreference(accountPref);//根据新建首选项编辑新的账户分组 } - + + /* + *功能：设置按键的状态和最后同步的时间 + */ private void loadSyncButton() { Button syncButton = (Button) findViewById(R.id.preference_sync_button); - TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview); + TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);//设置按钮的状态 - // set button state + //若是在同步状态下 if (GTaskSyncService.isSyncing()) { syncButton.setText(getString(R.string.preferences_button_sync_cancel)); syncButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { - GTaskSyncService.cancelSync(NotesPreferenceActivity.this); + 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); + 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))); - - // set last sync time + syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));//设置按键可用还是不可用 + + + // 设置最终同步时间 if (GTaskSyncService.isSyncing()) { lastSyncTimeView.setText(GTaskSyncService.getProgressString()); - lastSyncTimeView.setVisibility(View.VISIBLE); + 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 { long lastSyncTime = getLastSyncTime(this); if (lastSyncTime != 0) { @@ -188,34 +222,43 @@ public class NotesPreferenceActivity extends PreferenceActivity { lastSyncTime))); lastSyncTimeView.setVisibility(View.VISIBLE); } else { - lastSyncTimeView.setVisibility(View.GONE); + lastSyncTimeView.setVisibility(View.GONE);//若时间为空直接设置为不可见状态 } } } + /* + *功能：刷新标签界面 + *实现：调用上文设置账号和设置按键两个函数来实现 + */ private void refreshUI() { loadAccountPreference(); loadSyncButton(); } - + + /* + * 功能：显示账户选择的对话框并进行账户的设置 + */ private void showSelectAccountAlertDialog() { - AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this); - + AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this); //创建一个新的对话框 + + //设置标题以及子标题的内容 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)); - + dialogBuilder.setCustomTitle(titleView); dialogBuilder.setPositiveButton(null, null); + //获取同步账户信息 Account[] accounts = getGoogleAccounts(); String defAccount = getSyncAccountName(this); - + mOriAccounts = accounts; mHasAddedAccount = false; - + if (accounts.length > 0) { CharSequence[] items = new CharSequence[accounts.length]; final CharSequence[] itemMapping = items; @@ -223,86 +266,124 @@ public class NotesPreferenceActivity extends PreferenceActivity { int index = 0; for (Account account : accounts) { if (TextUtils.equals(account.name, defAccount)) { - checkedItem = index; + checkedItem = index; //在账户列表中查询到所需账户 + } items[index++] = account.name; } + + //设置点击后执行的事件，包括检录新同步账户和刷新标签界面 dialogBuilder.setSingleChoiceItems(items, checkedItem, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { setSyncAccount(itemMapping[which].toString()); - dialog.dismiss(); + dialog.dismiss();//取消对话框 + refreshUI(); } + }); } - + View addAccountView = LayoutInflater.from(this).inflate(R.layout.add_account_text, null); - dialogBuilder.setView(addAccountView); + 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 - final AlertDialog dialog = dialogBuilder.show(); + //建立新加账户对话框的监听器 addAccountView.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { - mHasAddedAccount = true; - Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS"); + 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); + startActivityForResult(intent, -1);//跳回上一个选项 + dialog.dismiss(); } }); - } + } + + /* + * 功能：显示账户选择对话框和相关账户操作 + */ private void showChangeAccountConfirmAlertDialog() { AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this); + //根据同步修改的账户信息设置标题以及子标题的内容 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)); - dialogBuilder.setCustomTitle(titleView); + + dialogBuilder.setCustomTitle(titleView);//设置对话框的自定义标题 + //定义一些标记字符串 CharSequence[] menuItemArray = new CharSequence[] { getString(R.string.preferences_menu_change_account), getString(R.string.preferences_menu_remove_account), getString(R.string.preferences_menu_cancel) }; + + + //设置对话框要显示的一个list，用于显示change，remove，cancel等命令 dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() { + //按键功能，由which来决定 public void onClick(DialogInterface dialog, int which) { if (which == 0) { - showSelectAccountAlertDialog(); + showSelectAccountAlertDialog();//进入账户选择对话框 } else if (which == 1) { + //删除账户并且跟新便签界面 removeSyncAccount(); refreshUI(); } } }); - dialogBuilder.show(); + dialogBuilder.show();//显示对话框 + } - + + /* + *功能：获取谷歌账户 + *实现：通过账户管理器直接获取 + */ private Account[] getGoogleAccounts() { AccountManager accountManager = AccountManager.get(this); return accountManager.getAccountsByType("com.google"); } - + + /* + * 功能：设置同步账户 + */ private void setSyncAccount(String account) { + + //假如该账号不在同步账号列表中 if (!getSyncAccountName(this).equals(account)) { SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); - SharedPreferences.Editor editor = settings.edit(); + SharedPreferences.Editor editor = settings.edit();//编辑共享的首选项 + + //将该账号加入到首选项中 if (account != null) { editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, account); } else { editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, ""); } - editor.commit(); - - // clean up last sync time - setLastSyncTime(this, 0); - - // clean up local gtask related info + + + editor.commit();//提交修改的数据 + + + + setLastSyncTime(this, 0);//将最后同步时间清零 + + + //重置当地同步任务的信息 new Thread(new Runnable() { public void run() { ContentValues values = new ContentValues(); @@ -311,25 +392,34 @@ public class NotesPreferenceActivity extends PreferenceActivity { getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null); } }).start(); - + + //将toast的文本信息置为“设置账户成功”并显示出来 Toast.makeText(NotesPreferenceActivity.this, getString(R.string.preferences_toast_success_set_accout, account), Toast.LENGTH_SHORT).show(); + } } - + /* + * 函数功能：删除同步账户 + */ private void removeSyncAccount() { SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = settings.edit(); + + //假如当前首选项中有账户就删除 if (settings.contains(PREFERENCE_SYNC_ACCOUNT_NAME)) { editor.remove(PREFERENCE_SYNC_ACCOUNT_NAME); + } + //删除当前首选项中账户时间 if (settings.contains(PREFERENCE_LAST_SYNC_TIME)) { editor.remove(PREFERENCE_LAST_SYNC_TIME); + } - editor.commit(); - - // clean up local gtask related info + editor.commit();//提交更新后的数据 + + //重置当地同步任务的信息 new Thread(new Runnable() { public void run() { ContentValues values = new ContentValues(); @@ -338,51 +428,78 @@ public class NotesPreferenceActivity extends PreferenceActivity { getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null); } }).start(); + } - + + /* + * 功能：获取同步账户名称 + * 实现：通过共享的首选项里的信息直接获取 + */ public static String getSyncAccountName(Context context) { SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); return settings.getString(PREFERENCE_SYNC_ACCOUNT_NAME, ""); } - + + /* + * 功能：设置最终同步的时间 + */ public static void setLastSyncTime(Context context, long time) { SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); - SharedPreferences.Editor editor = settings.edit(); + 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 + + //编辑最终同步时间并提交更新 editor.putLong(PREFERENCE_LAST_SYNC_TIME, time); editor.commit(); + } - + /* + * 功能：获取最终同步时间 + * 实现：通过共享的首选项里的信息直接获取 + */ public static long getLastSyncTime(Context context) { SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); return settings.getLong(PREFERENCE_LAST_SYNC_TIME, 0); } - + + /* + * 功能：接受同步信息 + * 实现：继承BroadcastReceiver + */ private class GTaskReceiver extends BroadcastReceiver { - + @Override public void onReceive(Context context, Intent intent) { refreshUI(); if (intent.getBooleanExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_IS_SYNCING, false)) { - TextView syncStatus = (TextView) findViewById(R.id.prefenerece_sync_status_textview); + //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)); + .getStringExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_PROGRESS_MSG));//通过获取的数据在设置系统的状态 } - + } } - + + /* + * 功能：处理菜单的选项 + * 参数:MenuItem菜单选项 + */ public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { + //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 case android.R.id.home: Intent intent = new Intent(this, NotesListActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); return true; + default: return false; } } } + \ No newline at end of file