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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.widget;
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import android.app.PendingIntent;
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import android.appwidget.AppWidgetManager;
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import android.appwidget.AppWidgetProvider;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.Intent;
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import android.database.Cursor;
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import android.util.Log;
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import android.widget.RemoteViews;
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import net.micode.notes.R;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.tool.ResourceParser;
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import net.micode.notes.ui.NoteEditActivity;
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import net.micode.notes.ui.NotesListActivity;
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public abstract class NoteWidgetProvider extends AppWidgetProvider {
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public static final String [] PROJECTION = new String [] {
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NoteColumns.ID,//笔记的ID号
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NoteColumns.BG_COLOR_ID,//背景颜色的ID号
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NoteColumns.SNIPPET//笔记的片段
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};
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/**
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*抽象类NoteWidgetProvider,并在其中定义了一个名为PROJECTION的常量数组。该数组中包含三个元素,分别是NoteColumns.ID、NoteColumns.BG_COLOR_ID和NoteColumns.SNIPPET
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*/
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public static final int COLUMN_ID = 0;
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public static final int COLUMN_BG_COLOR_ID = 1;
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public static final int COLUMN_SNIPPET = 2;
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//定义了三个常量 COLUMN_ID、COLUMN_BG_COLOR_ID 和 COLUMN_SNIPPET,它们分别被赋值为0、1和2。
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private static final String TAG = "NoteWidgetProvider";
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//定义了一个名为TAG的私有常量字符串,其值为 "NoteWidgetProvider",这个常量通常用于日志输出中,方便开发人员在调试时快速定位和识别日志信息来源。
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@Override
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public void onDeleted(Context context, int[] appWidgetIds) {
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ContentValues values = new ContentValues();//要更新到数据库中的键值对。
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values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
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for (int i = 0; i < appWidgetIds.length; i++) {
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context.getContentResolver().update(Notes.CONTENT_NOTE_URI,
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values,
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NoteColumns.WIDGET_ID + "=?",
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new String[] { String.valueOf(appWidgetIds[i])});
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}
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}
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/**
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*这段代码是一个名为 onDeleted() 的方法,用于在从主屏幕上删除指定的笔记小部件时调用。
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*/
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private Cursor getNoteWidgetInfo(Context context, int widgetId) {
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return context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
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PROJECTION,
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NoteColumns.WIDGET_ID + "=? AND " + NoteColumns.PARENT_ID + "<>?",
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new String[] { String.valueOf(widgetId), String.valueOf(Notes.ID_TRASH_FOLER) },//用ID来筛选,同时要是存在于未被删除的文件夹中
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null);
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}
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/**
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*查询数据库中与指定小部件 ID 相关联的所有笔记记录,并返回表示查询结果的 Cursor 对象
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*/
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protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
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update(context, appWidgetManager, appWidgetIds, false);
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}
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/**
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* 用于更新小部件的显示内容。该方法接受三个参数:context、appWidgetManager 和 appWidgetIds,分别表示上下文对象、小部件管理器和要更新的小部件 ID 列表。
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*/
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private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
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boolean privacyMode) {
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for (int i = 0; i < appWidgetIds.length; i++) {
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if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {
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int bgId = ResourceParser.getDefaultBgId(context);//通过调用 ResourceParser.getDefaultBgId(context) 方法来获取默认背景 ID 并赋值给整型变量 bgId。
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String snippet = "";
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Intent intent = new Intent(context, NoteEditActivity.class);
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intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
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intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]);
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intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType());
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/**
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* 创建一个 Intent 对象 intent,将 NoteEditActivity 类作为目标 Activity,并添加一些额外参数,如小部件 ID、小部件类型等信息,以及标志位 FLAG_ACTIVITY_SINGLE_TOP。
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*
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*/
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Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);//查询指定小部件所关联的笔记记录,
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if (c != null && c.moveToFirst()) {
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if (c.getCount() > 1) {
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Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);
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c.close();
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return;
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}
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snippet = c.getString(COLUMN_SNIPPET);
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bgId = c.getInt(COLUMN_BG_COLOR_ID);
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intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID));
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intent.setAction(Intent.ACTION_VIEW);
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} else {
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snippet = context.getResources().getString(R.string.widget_havenot_content);
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intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
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}
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/**
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* 查询结果是否为空,分别进行不同操作
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*/
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if (c != null) {
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c.close();
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}// Cursor 对象 c,
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RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());//rv,将其与小部件布局文件对应起来。
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rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId));
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intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);
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/**
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* Generate the pending intent to start host for the widget
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*/
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PendingIntent pendingIntent = null;
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if (privacyMode) {
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rv.setTextViewText(R.id.widget_text,
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context.getString(R.string.widget_under_visit_mode));//设置小部件的背景图片。
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pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
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context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
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} else {
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rv.setTextViewText(R.id.widget_text, snippet);
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pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
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PendingIntent.FLAG_UPDATE_CURRENT);
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}
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rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
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appWidgetManager.updateAppWidget(appWidgetIds[i], rv);//更新指定小部件的布局和显示内容。
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}
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}
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}
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/**
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* update 的私有重载方法是一个私有方法,接受四个参数:上下文对象 context、小部件管理器 appWidgetManager、小部件 ID 列表 appWidgetIds 和一个布尔型参数 privacyMode,表示是否启用隐私模式。在该方法中,我们可以根据是否启用隐私模式来更新小部件的显示内容,例如显示隐私模式的提示信息等。
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*/
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protected abstract int getBgResourceId(int bgId);
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protected abstract int getLayoutId();
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protected abstract int getWidgetType();
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}
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