From e6524568bba5105c05e6376718ea43a51449d424 Mon Sep 17 00:00:00 2001 From: baiyang <2962673726@qq.com> Date: Mon, 27 Nov 2023 21:30:43 +0800 Subject: [PATCH] =?UTF-8?q?ui=E7=AC=AC=E4=BA=94=E4=B8=AA=E6=96=87=E4=BB=B6?= =?UTF-8?q?=E8=A7=A3=E6=9E=90?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- DateTimePickerDialog.java | 87 +++++++++++ .../net/micode/notes/tool/BackupUtils.java | 139 +++++++++--------- .../java/net/micode/notes/tool/DataUtils.java | 101 +++++++------ 3 files changed, 211 insertions(+), 116 deletions(-) create mode 100644 DateTimePickerDialog.java diff --git a/DateTimePickerDialog.java b/DateTimePickerDialog.java new file mode 100644 index 0000000..c11de32 --- /dev/null +++ b/DateTimePickerDialog.java @@ -0,0 +1,87 @@ +package net.micode.notes.ui; + +import java.util.Calendar; + +import net.micode.notes.R; +import net.micode.notes.ui.DateTimePicker; +import net.micode.notes.ui.DateTimePicker.OnDateTimeChangedListener; + +import android.app.AlertDialog; +import android.content.Context; +import android.content.DialogInterface; +import android.content.DialogInterface.OnClickListener; +import android.text.format.DateFormat; +import android.text.format.DateUtils; + +public class DateTimePickerDialog extends AlertDialog implements OnClickListener { + + private Calendar mDate = Calendar.getInstance(); + //创建一个Calendar类型的变量 mDate，方便时间的操作 + private boolean mIs24HourView; + private OnDateTimeSetListener mOnDateTimeSetListener; + //声明一个时间日期滚动选择控件 mOnDateTimeSetListener + private DateTimePicker mDateTimePicker; + //DateTimePicker控件，控件一般用于让用户可以从日期列表中选择单个值。 + //运行时，单击控件边上的下拉箭头，会显示为两个部分：一个下拉列表，一个用于选择日期的 + + public interface OnDateTimeSetListener { + void OnDateTimeSet(AlertDialog dialog, long date); + } + + public DateTimePickerDialog(Context context, long date) { + //对该界面对话框的实例化 + super(context); + //对数据库的操作 + mDateTimePicker = new DateTimePicker(context); + setView(mDateTimePicker); + //添加一个子视图 + mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() { + public void onDateTimeChanged(DateTimePicker view, int year, int month, + int dayOfMonth, int hourOfDay, int minute) { + mDate.set(Calendar.YEAR, year); + mDate.set(Calendar.MONTH, month); + mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth); + mDate.set(Calendar.HOUR_OF_DAY, hourOfDay); + mDate.set(Calendar.MINUTE, minute); + //将视图中的各选项设置为系统当前时间 + updateTitle(mDate.getTimeInMillis()); + } + }); + mDate.setTimeInMillis(date); + //得到系统时间 + mDate.set(Calendar.SECOND, 0); + //将秒数设置为0 + mDateTimePicker.setCurrentDate(mDate.getTimeInMillis()); + setButton(context.getString(R.string.datetime_dialog_ok), this); + setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null); + //设置按钮 + set24HourView(DateFormat.is24HourFormat(this.getContext())); + //时间标准化打印 + updateTitle(mDate.getTimeInMillis()); + } + + public void set24HourView(boolean is24HourView) { + mIs24HourView = is24HourView; + } + + public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) { + mOnDateTimeSetListener = callBack; + }//将时间日期滚动选择控件实例化 + + private void updateTitle(long date) { + int flag = + DateUtils.FORMAT_SHOW_YEAR | + DateUtils.FORMAT_SHOW_DATE | + DateUtils.FORMAT_SHOW_TIME; + flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_24HOUR; + setTitle(DateUtils.formatDateTime(this.getContext(), date, flag)); + }//android开发中常见日期管理工具类（API）——DateUtils：按照上下午显示时间 + + public void onClick(DialogInterface arg0, int arg1) { + if (mOnDateTimeSetListener != null) { + mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis()); + } + }//第一个参数arg0是接收到点击事件的对话框 + //第二个参数arg1是该对话框上的按钮 + +} \ No newline at end of file diff --git a/src/MiNotes-master/app/src/main/java/net/micode/notes/tool/BackupUtils.java b/src/MiNotes-master/app/src/main/java/net/micode/notes/tool/BackupUtils.java index 39f6ec4..e743b8a 100644 --- a/src/MiNotes-master/app/src/main/java/net/micode/notes/tool/BackupUtils.java +++ b/src/MiNotes-master/app/src/main/java/net/micode/notes/tool/BackupUtils.java @@ -35,56 +35,60 @@ import java.io.FileOutputStream; import java.io.IOException; import java.io.PrintStream; - + public class BackupUtils { - private static final String TAG = "BackupUtils"; + private static final String TAG = "BackupUtils"; // Singleton stuff - private static BackupUtils sInstance; - + private static BackupUtils sInstance; //类里面为什么可以定义自身类的对象？ + public static synchronized BackupUtils getInstance(Context context) { + //ynchronized 关键字，代表这个方法加锁,相当于不管哪一个线程（例如线程A） + //运行到这个方法时,都要检查有没有其它线程B（或者C、 D等）正在用这个方法(或者该类的其他同步方法)，有的话要等正在使用synchronized方法的线程B（或者C 、D）运行完这个方法后再运行此线程A,没有的话,锁定调用者,然后直接运行。 + //它包括两种用法：synchronized 方法和 synchronized 块。 if (sInstance == null) { + //如果当前备份不存在，则新声明一个 sInstance = new BackupUtils(context); } return sInstance; } - + /** * Following states are signs to represents backup or restore * status */ - // Currently, the sdcard is not mounted - public static final int STATE_SD_CARD_UNMOUONTED = 0; - // The backup file not exist + // Currently, the sdcard is not mounted SD卡没有被装入手机 + public static final int STATE_SD_CARD_UNMOUONTED = 0; + // The backup file not exist 备份文件夹不存在 public static final int STATE_BACKUP_FILE_NOT_EXIST = 1; - // The data is not well formated, may be changed by other programs + // The data is not well formated, may be changed by other programs 数据已被破坏，可能被修改 public static final int STATE_DATA_DESTROIED = 2; - // Some run-time exception which causes restore or backup fails + // Some run-time exception which causes restore or backup fails 超时异常 public static final int STATE_SYSTEM_ERROR = 3; - // Backup or restore success + // Backup or restore success 成功存储 public static final int STATE_SUCCESS = 4; - + private TextExport mTextExport; - - private BackupUtils(Context context) { + + private BackupUtils(Context context) { //初始化函数 mTextExport = new TextExport(context); } - - private static boolean externalStorageAvailable() { + + private static boolean externalStorageAvailable() { //外部存储功能是否可用 return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()); } - + public int exportToText() { return mTextExport.exportToText(); } - + public String getExportedTextFileName() { return mTextExport.mFileName; } - + public String getExportedTextFileDir() { return mTextExport.mFileDirectory; } - + private static class TextExport { private static final String[] NOTE_PROJECTION = { NoteColumns.ID, @@ -92,13 +96,13 @@ public class BackupUtils { NoteColumns.SNIPPET, NoteColumns.TYPE }; - + private static final int NOTE_COLUMN_ID = 0; - + private static final int NOTE_COLUMN_MODIFIED_DATE = 1; - + private static final int NOTE_COLUMN_SNIPPET = 2; - + private static final String[] DATA_PROJECTION = { DataColumns.CONTENT, DataColumns.MIME_TYPE, @@ -107,71 +111,71 @@ public class BackupUtils { DataColumns.DATA3, DataColumns.DATA4, }; - + private static final int DATA_COLUMN_CONTENT = 0; - + private static final int DATA_COLUMN_MIME_TYPE = 1; - + private static final int DATA_COLUMN_CALL_DATE = 2; - + private static final int DATA_COLUMN_PHONE_NUMBER = 4; - + private final String [] TEXT_FORMAT; private static final int FORMAT_FOLDER_NAME = 0; private static final int FORMAT_NOTE_DATE = 1; private static final int FORMAT_NOTE_CONTENT = 2; - + private Context mContext; private String mFileName; private String mFileDirectory; - + public TextExport(Context context) { TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note); mContext = context; - mFileName = ""; + mFileName = ""; //为什么为空? mFileDirectory = ""; } - - private String getFormat(int id) { + + private String getFormat(int id) { //获取文本的组成部分 return TEXT_FORMAT[id]; } - + /** * Export the folder identified by folder id to text */ - private void exportFolderToText(String folderId, PrintStream ps) { - // Query notes belong to this folder + private void exportFolderToText(String folderId, PrintStream ps) { + // Query notes belong to this folder 通过查询parent id是文件夹id的note来选出制定ID文件夹下的Note Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI, NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] { folderId }, null); - - if (notesCursor != null) { + + if (notesCursor != null) { if (notesCursor.moveToFirst()) { do { - // Print note's last modified date + // Print note's last modified date ps里面保存有这份note的日期 ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format( mContext.getString(R.string.format_datetime_mdhm), notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE)))); // Query data belong to this note String noteId = notesCursor.getString(NOTE_COLUMN_ID); - exportNoteToText(noteId, ps); + exportNoteToText(noteId, ps); //将文件导出到text } while (notesCursor.moveToNext()); } notesCursor.close(); } } - + /** * Export note identified by id to a print stream */ - private void exportNoteToText(String noteId, PrintStream ps) { + private void exportNoteToText(String noteId, PrintStream ps) { Cursor dataCursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI, DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[] { noteId }, null); - - if (dataCursor != null) { + + if (dataCursor != null) { //利用光标来扫描内容，区别为callnote和note两种，靠ps.printline输出 if (dataCursor.moveToFirst()) { do { String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE); @@ -180,8 +184,8 @@ public class BackupUtils { String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER); long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE); String location = dataCursor.getString(DATA_COLUMN_CONTENT); - - if (!TextUtils.isEmpty(phoneNumber)) { + + if (!TextUtils.isEmpty(phoneNumber)) { //判断是否为空字符 ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), phoneNumber)); } @@ -214,29 +218,29 @@ public class BackupUtils { Log.e(TAG, e.toString()); } } - + /** * Note will be exported as text which is user readable */ - public int exportToText() { + public int exportToText() { //总函数，调用上面的exportFolder和exportNote if (!externalStorageAvailable()) { Log.d(TAG, "Media was not mounted"); return STATE_SD_CARD_UNMOUONTED; } - + PrintStream ps = getExportToTextPrintStream(); if (ps == null) { Log.e(TAG, "get print stream error"); return STATE_SYSTEM_ERROR; } - // First export folder and its notes + // First export folder and its notes 导出文件夹，就是导出里面包含的便签 Cursor folderCursor = mContext.getContentResolver().query( Notes.CONTENT_NOTE_URI, NOTE_PROJECTION, "(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR " + NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, null, null); - + if (folderCursor != null) { if (folderCursor.moveToFirst()) { do { @@ -256,14 +260,14 @@ public class BackupUtils { } folderCursor.close(); } - - // Export notes in root's folder + + // Export notes in root's folder 将根目录里的便签导出（由于不属于任何文件夹，因此无法通过文件夹导出来实现这一部分便签的导出） Cursor noteCursor = mContext.getContentResolver().query( Notes.CONTENT_NOTE_URI, NOTE_PROJECTION, NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID + "=0", null, null); - + if (noteCursor != null) { if (noteCursor.moveToFirst()) { do { @@ -278,14 +282,14 @@ public class BackupUtils { noteCursor.close(); } ps.close(); - + return STATE_SUCCESS; } - + /** * Get a print stream pointed to the file {@generateExportedTextFile} */ - private PrintStream getExportToTextPrintStream() { + private PrintStream getExportToTextPrintStream() { File file = generateFileMountedOnSDcard(mContext, R.string.file_path, R.string.file_name_txt_format); if (file == null) { @@ -297,7 +301,7 @@ public class BackupUtils { PrintStream ps = null; try { FileOutputStream fos = new FileOutputStream(file); - ps = new PrintStream(fos); + ps = new PrintStream(fos); //将ps输出流输出到特定的文件，目的就是导出到文件，而不是直接输出 } catch (FileNotFoundException e) { e.printStackTrace(); return null; @@ -308,22 +312,22 @@ public class BackupUtils { return ps; } } - + /** * Generate the text file to store imported data */ private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) { StringBuilder sb = new StringBuilder(); - sb.append(Environment.getExternalStorageDirectory()); - sb.append(context.getString(filePathResId)); - File filedir = new File(sb.toString()); + sb.append(Environment.getExternalStorageDirectory()); //外部（SD卡）的存储路径 + sb.append(context.getString(filePathResId)); //文件的存储路径 + File filedir = new File(sb.toString()); //filedir应该就是用来存储路径信息 sb.append(context.getString( fileNameFormatResId, DateFormat.format(context.getString(R.string.format_date_ymd), System.currentTimeMillis()))); File file = new File(sb.toString()); - - try { + + try { //如果这些文件不存在，则新建 if (!filedir.exists()) { filedir.mkdir(); } @@ -336,9 +340,8 @@ public class BackupUtils { } catch (IOException e) { e.printStackTrace(); } - +// try catch 异常处理 return null; } } - - + diff --git a/src/MiNotes-master/app/src/main/java/net/micode/notes/tool/DataUtils.java b/src/MiNotes-master/app/src/main/java/net/micode/notes/tool/DataUtils.java index 2a14982..3e84b20 100644 --- a/src/MiNotes-master/app/src/main/java/net/micode/notes/tool/DataUtils.java +++ b/src/MiNotes-master/app/src/main/java/net/micode/notes/tool/DataUtils.java @@ -35,9 +35,11 @@ import java.util.ArrayList; import java.util.HashSet; +package net.micode.notes.tool; + public class DataUtils { public static final String TAG = "DataUtils"; - public static boolean batchDeleteNotes(ContentResolver resolver, HashSet ids) { + public static boolean batchDeleteNotes(ContentResolver resolver, HashSet ids) { //直接删除多个笔记 if (ids == null) { Log.d(TAG, "the ids is null"); return true; @@ -46,19 +48,20 @@ public class DataUtils { Log.d(TAG, "no id is in the hashset"); return true; } - - ArrayList operationList = new ArrayList(); + + ArrayList operationList = new ArrayList(); //提供一个任务列表 for (long id : ids) { if(id == Notes.ID_ROOT_FOLDER) { Log.e(TAG, "Don't delete system folder root"); continue; - } + } //如果发现是根文件夹，则不删除 ContentProviderOperation.Builder builder = ContentProviderOperation - .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); - operationList.add(builder.build()); + .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); //用newDelete实现删除功能 + operationList.add(builder.build()); // } try { - ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); + ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);//主机名（或叫Authority）用于唯一标识这个ContentProvider，外部调用者可以根据这个标识来找到它。 + //数据库事务，数据库事务是由一组数据库操作序列组成，事务作为一个整体被执行 if (results == null || results.length == 0 || results[0] == null) { Log.d(TAG, "delete notes failed, ids:" + ids.toString()); return false; @@ -71,33 +74,33 @@ public class DataUtils { } return false; } - + public static void moveNoteToFoler(ContentResolver resolver, long id, long srcFolderId, long desFolderId) { ContentValues values = new ContentValues(); values.put(NoteColumns.PARENT_ID, desFolderId); values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId); values.put(NoteColumns.LOCAL_MODIFIED, 1); - resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null); + resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null); //对需要移动的便签进行数据更新，然后用update实现 } - + public static boolean batchMoveToFolder(ContentResolver resolver, HashSet ids, long folderId) { if (ids == null) { Log.d(TAG, "the ids is null"); return true; } - + ArrayList operationList = new ArrayList(); for (long id : ids) { ContentProviderOperation.Builder builder = ContentProviderOperation - .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); + .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); //通过withAppendedId方法，为该Uri加上ID builder.withValue(NoteColumns.PARENT_ID, folderId); builder.withValue(NoteColumns.LOCAL_MODIFIED, 1); operationList.add(builder.build()); - } - + }//将ids里包含的每一列的数据逐次加入到operationList中，等待最后的批量处理 + try { - ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); + ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); //applyBatch一次性处理一个操作列表 if (results == null || results.length == 0 || results[0] == null) { Log.d(TAG, "delete notes failed, ids:" + ids.toString()); return false; @@ -110,7 +113,7 @@ public class DataUtils { } return false; } - + /** * Get the all folder count except system folders {@link Notes#TYPE_SYSTEM}} */ @@ -119,13 +122,13 @@ public class DataUtils { new String[] { "COUNT(*)" }, NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?", new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)}, - null); - + null); //筛选条件：源文件不为trash folder + int count = 0; if(cursor != null) { if(cursor.moveToFirst()) { try { - count = cursor.getInt(0); + count = cursor.getInt(0); } catch (IndexOutOfBoundsException e) { Log.e(TAG, "get folder count failed:" + e.toString()); } finally { @@ -134,29 +137,29 @@ public class DataUtils { } } return count; - } - + } + public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) { - Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), + Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), //通过withAppendedId方法，为该Uri加上ID null, NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER, - new String [] {String.valueOf(type)}, - null); - + new String [] {String.valueOf(type)}, + null); //查询条件：type符合，且不属于垃圾文件夹 + boolean exist = false; if (cursor != null) { - if (cursor.getCount() > 0) { + if (cursor.getCount() > 0) {//用getcount函数判断cursor是否为空 exist = true; } cursor.close(); } return exist; } - + public static boolean existInNoteDatabase(ContentResolver resolver, long noteId) { Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null, null, null, null); - + boolean exist = false; if (cursor != null) { if (cursor.getCount() > 0) { @@ -166,11 +169,11 @@ public class DataUtils { } return exist; } - + public static boolean existInDataDatabase(ContentResolver resolver, long dataId) { Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null, null, null, null); - + boolean exist = false; if (cursor != null) { if (cursor.getCount() > 0) { @@ -180,13 +183,14 @@ public class DataUtils { } return exist; } - + public static boolean checkVisibleFolderName(ContentResolver resolver, String name) { Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, null, NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + " AND " + NoteColumns.SNIPPET + "=?", new String[] { name }, null); + //通过名字查询文件是否存在 boolean exist = false; if(cursor != null) { if(cursor.getCount() > 0) { @@ -196,14 +200,14 @@ public class DataUtils { } return exist; } - + public static HashSet getFolderNoteWidget(ContentResolver resolver, long folderId) { Cursor c = resolver.query(Notes.CONTENT_NOTE_URI, new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE }, NoteColumns.PARENT_ID + "=?", new String[] { String.valueOf(folderId) }, - null); - + null); //查询条件：父ID是传入的folderId; + HashSet set = null; if (c != null) { if (c.moveToFirst()) { @@ -211,26 +215,26 @@ public class DataUtils { do { try { AppWidgetAttribute widget = new AppWidgetAttribute(); - widget.widgetId = c.getInt(0); - widget.widgetType = c.getInt(1); + widget.widgetId = c.getInt(0); //0对应的NoteColumns.WIDGET_ID + widget.widgetType = c.getInt(1); //1对应的NoteColumns.WIDGET_TYPE set.add(widget); } catch (IndexOutOfBoundsException e) { Log.e(TAG, e.toString()); } - } while (c.moveToNext()); + } while (c.moveToNext()); //查询下一条 } c.close(); } return set; } - + public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) { Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI, new String [] { CallNote.PHONE_NUMBER }, CallNote.NOTE_ID + "=? AND " + CallNote.MIME_TYPE + "=?", new String [] { String.valueOf(noteId), CallNote.CONTENT_ITEM_TYPE }, null); - + if (cursor != null && cursor.moveToFirst()) { try { return cursor.getString(0); @@ -242,7 +246,7 @@ public class DataUtils { } return ""; } - + public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) { Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI, new String [] { CallNote.NOTE_ID }, @@ -250,11 +254,12 @@ public class DataUtils { + CallNote.PHONE_NUMBER + ",?)", new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber }, null); - + //通过数据库操作，查询条件是（callDate和phoneNumber匹配传入参数的值） + if (cursor != null) { if (cursor.moveToFirst()) { try { - return cursor.getLong(0); + return cursor.getLong(0); //0对应的CallNote.NOTE_ID } catch (IndexOutOfBoundsException e) { Log.e(TAG, "Get call note id fails " + e.toString()); } @@ -263,14 +268,14 @@ public class DataUtils { } return 0; } - + public static String getSnippetById(ContentResolver resolver, long noteId) { Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, new String [] { NoteColumns.SNIPPET }, NoteColumns.ID + "=?", new String [] { String.valueOf(noteId)}, - null); - + null);//查询条件：noteId + if (cursor != null) { String snippet = ""; if (cursor.moveToFirst()) { @@ -281,8 +286,7 @@ public class DataUtils { } throw new IllegalArgumentException("Note is not found with id: " + noteId); } - - public static String getFormattedSnippet(String snippet) { + public static String getFormattedSnippet(String snippet) { //对字符串进行格式处理，将字符串两头的空格去掉，同时将换行符去掉 if (snippet != null) { snippet = snippet.trim(); int index = snippet.indexOf('\n'); @@ -292,4 +296,5 @@ public class DataUtils { } return snippet; } -} + +} \ No newline at end of file