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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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/**
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* 抽象类,提供便签小部件的功能。
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*/
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public abstract class NoteWidgetProvider extends AppWidgetProvider {
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// 查询便签小部件信息所需的投影
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public static final String[] PROJECTION = new String[] {
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NoteColumns.ID,
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NoteColumns.BG_COLOR_ID,
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NoteColumns.SNIPPET
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};// 定义了一个静态常量数组 PROJECTION,用于指定在查询便签小部件信息时需要返回的列
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public static final int COLUMN_ID = 0;// 定义了一个公共静态常量 COLUMN_ID,其值为 0。这个常量用于表示在查询便签小部件信息时,ID 列所在的位置。
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public static final int COLUMN_BG_COLOR_ID = 1;// 定义了另一个公共静态常量 COLUMN_BG_COLOR_ID,其值为 1。这个常量用于表示在查询便签小部件信息时,背景颜色 ID
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// 列所在的位置。
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public static final int COLUMN_SNIPPET = 2;// 定义了第三个公共静态常量 COLUMN_SNIPPET,其值为
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// 2。这个常量用于表示在查询便签小部件信息时,摘要(snippet)列所在的位置。
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private static final String TAG = "NoteWidgetProvider";
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@Override
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public void onDeleted(Context context, int[] appWidgetIds) {
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// 当小部件被删除时,将小部件 ID 更新为无效的 ID
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ContentValues values = new ContentValues();
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values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);// 将所有具有特定小部件ID的便签的小部件ID设置为无效的ID。
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for (int i = 0; i < appWidgetIds.length; i++) {
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// 遍历给定的小部件ID数组 appWidgetIds。
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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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* 获取便签小部件信息的游标
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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) },
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null);
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}// 使用 context.getContentResolver().query() 方法查询数据库中的便签信息。
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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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}// 使用保护的方法更新便签小部件。
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/**
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* 更新小部件的方法
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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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// 历传入的小部件ID数组 appWidgetIds。
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if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {
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// 在循环中,检查当前小部件ID是否有效,即不等于 AppWidgetManager.INVALID_APPWIDGET_ID。
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int bgId = ResourceParser.getDefaultBgId(context);// 获取默认背景ID。
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String snippet = "";// 创建一个空字符串 snippet,用于存储便签摘要信息。
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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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// 向 Intent 中添加小部件ID和小部件类型的额外信息。
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Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
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// 进行判断,对便签信息进行存储等相关操作。
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if (c != null && c.moveToFirst()) {
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if (c.getCount() > 1) {
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Log.e(TAG, "相同小部件 ID 的多条信息:" + 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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if (c != null) {
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c.close();
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}
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RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());// 创建一个 RemoteViews
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// 对象,用于更新小部件的视图。
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rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId));
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// 设置小部件布局中 R.id.widget_bg_image 控件的背景图片资源,背景图片资源由 getBgResourceId(bgId)
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// 方法根据传入的背景ID bgId 获取。
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intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);// 将背景ID添加到 Intent 中。
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// 生成启动活动的待定意图
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PendingIntent pendingIntent = null;
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// 设置小部件的文本内容和点击事件的处理逻辑。
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if (privacyMode) {
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// 在隐私的前提下,将小部件的文本内容设置为提示用户当前处于访问模式下。
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rv.setTextViewText(R.id.widget_text,
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context.getString(R.string.widget_under_visit_mode));
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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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// 如果没有隐私,将小部件的文本内容设置为便签的摘要信息(snippet)。
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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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// 将点击事件处理的 PendingIntent 设置给小部件的文本视图(R.id.widget_text)。
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appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
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// 更新小部件的内容和点击事件处理逻辑。
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}
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}
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}
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/**
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* 根据 bgId 获取背景资源 ID
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*/
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protected abstract int getBgResourceId(int bgId);
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/**
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* 获取小部件的布局 ID
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*/
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protected abstract int getLayoutId();
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/**
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* 获取小部件类型
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*/
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protected abstract int getWidgetType();
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}
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// 代码实现了一个抽象类
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// NoteWidgetProvider,用于管理便签小部件的显示和更新。它提供了获取便签小部件信息、更新小部件等功能,并定义了一些抽象方法需要在子类中实现。
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