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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; // 用于处理延迟执行的Intent
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import android.appwidget.AppWidgetManager; // 管理应用小部件的类
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import android.appwidget.AppWidgetProvider; // 小部件的基类
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import android.content.ContentValues; // 用于向ContentProvider提供新值
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import android.content.Context; // 提供应用环境信息的类
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import android.content.Intent; // 用于不同组件间通信的类
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import android.database.Cursor; // 用于遍历查询结果的类
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import android.util.Log; // 用于打印日志信息
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import android.widget.RemoteViews; // 用于在远程视图中更新小部件的UI
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import net.micode.notes.R; // 应用的资源类
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import net.micode.notes.data.Notes; // 笔记的数据访问类
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import net.micode.notes.data.Notes.NoteColumns; // 笔记数据表的列定义
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import net.micode.notes.tool.ResourceParser; // 资源解析工具类
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import net.micode.notes.ui.NoteEditActivity; // 编辑笔记的Activity
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import net.micode.notes.ui.NotesListActivity; // 笔记列表的Activity
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// 定义一个抽象类，用于实现自定义笔记小部件
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public abstract class NoteWidgetProvider extends AppWidgetProvider {
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// 定义查询笔记时需要的列
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public static final String [] PROJECTION = new String [] {
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NoteColumns.ID, // 笔记ID
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NoteColumns.BG_COLOR_ID, // 笔记背景颜色ID
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NoteColumns.SNIPPET // 笔记摘要
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};
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// 定义列的索引，用于从Cursor中获取数据
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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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// 定义日志标签
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private static final String TAG = "NoteWidgetProvider";
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// 当小部件被删除时调用
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@Override
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public void onDeleted(Context context, int[] appWidgetIds) {
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// 更新被删除小部件对应的笔记中的WIDGET_ID为无效值
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ContentValues values = new ContentValues();
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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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// 根据小部件ID获取笔记信息
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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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// 更新小部件的UI（公开方法）
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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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// 更新小部件的UI（私有方法，支持隐私模式）
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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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// 获取默认背景ID和摘要文本
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int bgId = ResourceParser.getDefaultBgId(context);
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String snippet = "";
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// 创建跳转到编辑笔记Activity的Intent
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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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// 查询小部件对应的笔记信息
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Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
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if (c != null && c.moveToFirst()) {
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if (c.getCount() > 1) {
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// 如果有多条记录，打印错误日志并关闭Cursor
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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Cursor中获取摘要和背景ID，并设置Intent的额外数据
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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);
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} else {
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// 如果没有找到笔记，设置默认摘要文本和Intent动作
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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Cursor
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if (c != null) {
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c.close();
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}
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// 创建RemoteViews对象并设置背景和资源
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RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
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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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// 根据隐私模式设置不同的PendingIntent
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PendingIntent pendingIntent = null;
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if (privacyMode) {
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// 隐私模式下，设置文本为提示信息，并创建跳转到笔记列表的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，设置文本为摘要，并创建跳转到编辑笔记的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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// 抽象方法，用于获取背景资源的ID
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protected abstract int getBgResourceId(int bgId);
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// 抽象方法，用于获取小部件的布局ID
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protected abstract int getLayoutId();
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// 抽象方法，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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