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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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* 便签小部件基类，定义不同尺寸小部件的通用行为
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* 子类需实现具体布局、背景资源和小部件类型的获取
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*/
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public abstract class NoteWidgetProvider extends AppWidgetProvider {
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// 查询便签数据时使用的字段投影
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public static final String [] PROJECTION = new String [] {
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NoteColumns.ID, // 便签ID
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NoteColumns.BG_COLOR_ID, // 背景颜色ID
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NoteColumns.SNIPPET // 便签内容摘要
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};
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// 投影字段对应的索引值
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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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private static final String TAG = "NoteWidgetProvider";
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/**
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* 当小部件被删除时调用
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* 清除数据库中与该小部件关联的记录
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*/
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@Override
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public void onDeleted(Context context, int[] appWidgetIds) {
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ContentValues values = new ContentValues();
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// 将小部件ID设为无效值
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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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// 更新数据库中关联该小部件的便签记录
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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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* 获取与指定小部件关联的便签信息
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* @param context 上下文
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* @param widgetId 小部件ID
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* @return 包含便签信息的游标
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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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// 查询条件：小部件ID匹配且不在回收站中
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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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}
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/**
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* 公开的更新方法，调用带隐私模式参数的私有更新方法
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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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* 核心更新方法，更新小部件的UI显示
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* @param context 上下文
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* @param appWidgetManager 小部件管理器
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* @param appWidgetIds 需要更新的小部件ID数组
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* @param privacyMode 是否隐私模式（隐藏内容）
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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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// 只处理有效的小部件ID
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if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {
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// 默认背景颜色ID
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int bgId = ResourceParser.getDefaultBgId(context);
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// 便签内容摘要
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String snippet = "";
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// 点击小部件时的跳转意图
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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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// 查询与当前小部件关联的便签数据
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Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
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if (c != null && c.moveToFirst()) {
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// 检查是否有多个便签关联到同一小部件（异常情况）
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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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// 从游标中获取数据
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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); // 查看已有便签
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} else {
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// 无关联便签时显示默认文本
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snippet = context.getResources().getString(R.string.widget_havenot_content);
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intent.setAction(Intent.ACTION_INSERT_OR_EDIT); // 新建便签
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}
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// 关闭游标释放资源
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if (c != null) {
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c.close();
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}
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// 加载小部件布局
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RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
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// 设置背景图片
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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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// 创建点击事件的PendingIntent
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PendingIntent pendingIntent = null;
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if (privacyMode) {
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// 隐私模式下显示提示文本，点击跳转至便签列表
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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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// 正常模式下显示便签内容，点击跳转至编辑页
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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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// 设置点击事件
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rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
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// 更新小部件
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appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
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}
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}
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}
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/**
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* 抽象方法：获取背景资源ID
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* 由子类实现不同尺寸小部件的背景资源
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*/
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protected abstract int getBgResourceId(int bgId);
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/**
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* 抽象方法：获取布局ID
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* 由子类实现不同尺寸小部件的布局文件
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*/
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protected abstract int getLayoutId();
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/**
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* 抽象方法：获取小部件类型
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* 由子类定义具体的小部件类型（如2x、4x等）
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*/
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protected abstract int getWidgetType();
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}
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fangzheng
7 hours ago