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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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// 包声明,该类所在的包名为net.micode.notes.widget
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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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// 抽象的AppWidgetProvider子类,用于为笔记相关的小部件提供功能支持
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// 注意它是抽象类,意味着具体功能需要由子类去实现特定的抽象方法
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public abstract class NoteWidgetProvider extends AppWidgetProvider {
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// 定义查询数据库时使用的投影(即要查询的列),用于获取笔记小部件相关信息
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// 包含笔记的ID、背景颜色ID以及内容摘要等列
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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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};
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// 定义列索引常量,方便后续从游标(Cursor)中获取对应列的数据
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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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// 用于日志输出的标签,方便在日志中识别该类相关的输出信息
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private static final String TAG = "NoteWidgetProvider";
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// 当小部件被删除时调用的方法
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// 作用是将与被删除小部件相关的数据库记录中的WIDGET_ID设置为无效值
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// 这样表示对应的笔记不再与该小部件关联
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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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// 设置要更新到数据库的WIDGET_ID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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// 通过ContentResolver更新数据库中对应的记录
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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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// 私有方法,用于获取与指定小部件ID相关的笔记小部件信息的游标(Cursor)
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// 通过查询数据库,筛选出符合特定条件(小部件ID匹配且不属于回收站文件夹)的笔记记录
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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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}
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// 用于更新小部件的方法,调用了另一个重载的update方法并传入默认的隐私模式参数(false)
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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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// 私有方法,真正执行小部件更新的逻辑
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// 根据传入的小部件ID数组,逐个更新对应的小部件显示内容和相关交互设置等
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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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// 检查小部件ID是否有效,如果无效则跳过该小部件的更新
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if (appWidgetIds[i]!= AppWidgetManager.INVALID_APPWIDGET_ID) {
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int bgId = ResourceParser.getDefaultBgId(context);
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String snippet = "";
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// 创建一个启动NoteEditActivity的意图(Intent),用于点击小部件文本时进行相应操作
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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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// 获取与当前小部件ID相关的笔记信息游标
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Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
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if (c!= null && c.moveToFirst()) {
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// 如果查询到多条记录对应同一个小部件ID,则记录错误日志并关闭游标,返回不再继续更新
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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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// 从游标中获取内容摘要、背景颜色ID以及笔记ID等信息,并设置到相应变量和意图中
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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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// 如果没有查询到对应笔记信息,则设置默认的提示文本,并设置意图的操作类型为插入或编辑
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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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// 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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// 创建RemoteViews对象,用于设置小部件的布局和显示内容
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RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
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// 设置小部件背景图片资源ID
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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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// 根据隐私模式生成对应的PendingIntent,用于处理小部件点击事件
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PendingIntent pendingIntent = null;
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if (privacyMode) {
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// 如果是隐私模式,设置特定的提示文本,并创建启动NotesListActivity的PendingIntent
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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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// 非隐私模式下,设置内容摘要文本,并创建基于前面创建的intent的PendingIntent
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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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// 设置小部件文本的点击事件PendingIntent
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rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
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// 通过AppWidgetManager更新小部件的显示内容
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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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// 抽象方法,由子类实现,用于根据给定的背景颜色ID获取对应的背景资源ID
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protected abstract int getBgResourceId(int bgId);
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// 抽象方法,由子类实现,用于获取小部件对应的布局资源ID
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protected abstract int getLayoutId();
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// 抽象方法,由子类实现,用于获取小部件的类型
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protected abstract int getWidgetType();
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}
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