/* * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.micode.notes.widget;// 包声明，指明代码属于哪个包 import android.app.PendingIntent;// 导入PendingIntent类 import android.appwidget.AppWidgetManager;// 导入AppWidgetManager类 import android.appwidget.AppWidgetProvider;// 导入AppWidgetProvider类 import android.content.ContentValues;// 导入ContentValues类 import android.content.Context;// 导入Context类 import android.content.Intent;// 导入Intent类 import android.database.Cursor;// 导入Cursor类 import android.util.Log;// 导入Log类 import android.widget.RemoteViews;// 导入RemoteViews类 import net.micode.notes.R;// 导入R类，用于访问资源 import net.micode.notes.data.Notes;// 导入Notes类 import net.micode.notes.data.Notes.NoteColumns;// 导入NoteColumns类 import net.micode.notes.tool.ResourceParser;// 导入ResourceParser类 import net.micode.notes.ui.NoteEditActivity;// 导入NoteEditActivity类 import net.micode.notes.ui.NotesListActivity;// 导入NotesListActivity类 public abstract class NoteWidgetProvider extends AppWidgetProvider {// 声明一个抽象类NoteWidgetProvider，继承自AppWidgetProvider public static final String [] PROJECTION = new String [] { NoteColumns.ID, NoteColumns.BG_COLOR_ID, NoteColumns.SNIPPET };// 定义一个常量数组PROJECTION，包含NoteColumns的ID、BG_COLOR_ID和SNIPPET public static final int COLUMN_ID = 0;// 定义COLUMN_ID常量，值为0 public static final int COLUMN_BG_COLOR_ID = 1;// 定义COLUMN_BG_COLOR_ID常量，值为1 public static final int COLUMN_SNIPPET = 2;// 定义COLUMN_SNIPPET常量，值为2 private static final String TAG = "NoteWidgetProvider";// 定义TAG常量，用于日志记录 @Override public void onDeleted(Context context, int[] appWidgetIds) {// 重写onDeleted方法，当小部件被删除时调用 ContentValues values = new ContentValues();// 创建ContentValues对象 values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);// 将WIDGET_ID列的值设置为INVALID_APPWIDGET_ID for (int i = 0; i < appWidgetIds.length; i++) { context.getContentResolver().update(Notes.CONTENT_NOTE_URI, values, NoteColumns.WIDGET_ID + "=?", new String[] { String.valueOf(appWidgetIds[i])});// 更新数据库，将指定小部件ID的WIDGET_ID列设置为INVALID_APPWIDGET_ID } } private Cursor getNoteWidgetInfo(Context context, int widgetId) {// 定义getNoteWidgetInfo方法，获取小部件信息 return context.getContentResolver().query(Notes.CONTENT_NOTE_URI, PROJECTION, NoteColumns.WIDGET_ID + "=? AND " + NoteColumns.PARENT_ID + "<>?", new String[] { String.valueOf(widgetId), String.valueOf(Notes.ID_TRASH_FOLER) }, null);// 查询数据库，返回符合条件的Cursor对象 } protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {// 定义update方法，更新小部件 update(context, appWidgetManager, appWidgetIds, false); }// 调用重载的update方法，传入false作为privacyMode参数 private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds, boolean privacyMode) {// 定义重载的update方法，更新小部件，传入privacyMode参数 for (int i = 0; i < appWidgetIds.length; i++) { if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {// 如果小部件ID有效 int bgId = ResourceParser.getDefaultBgId(context);// 获取默认背景ID String snippet = "";// 初始化snippet字符串 Intent intent = new Intent(context, NoteEditActivity.class);// 创建Intent对象，指向NoteEditActivity intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);// 设置Intent标志，确保活动位于任务栈顶部 intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]);// 添加额外数据，指定小部件ID intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType());// 添加额外数据，指定小部件类型 Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);// 获取小部件信息的Cursor对象 if (c != null && c.moveToFirst()) {// 如果Cursor不为空且移动到第一条记录 if (c.getCount() > 1) {// 如果记录数大于1 Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);// 记录错误日志 c.close(); return; } snippet = c.getString(COLUMN_SNIPPET);// 获取SNIPPET列的值 bgId = c.getInt(COLUMN_BG_COLOR_ID);// 获取BG_COLOR_ID列的值 intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID)); // 添加额外数据，指定记录ID intent.setAction(Intent.ACTION_VIEW); } else { snippet = context.getResources().getString(R.string.widget_havenot_content); intent.setAction(Intent.ACTION_INSERT_OR_EDIT); }// 设置Intent动作为ACTION_INSERT_OR_EDIT if (c != null) { c.close(); } RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());// 创建RemoteViews对象，指定布局ID rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId)); intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);// 设置背景图片资源ID /** * Generate the pending intent to start host for the widget */ PendingIntent pendingIntent = null; if (privacyMode) { // 如果隐私模式 rv.setTextViewText(R.id.widget_text, context.getString(R.string.widget_under_visit_mode));// 设置文本视图内容为隐私模式提示 pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent( context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT); } else { rv.setTextViewText(R.id.widget_text, snippet); pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent, PendingIntent.FLAG_UPDATE_CURRENT);// 创建PendingIntent对象，指向NoteEditActivity } rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);// 设置文本视图的点击 appWidgetManager.updateAppWidget(appWidgetIds[i], rv); } } } protected abstract int getBgResourceId(int bgId);// 声明抽象方法getBgResourceId，获取背景资源ID protected abstract int getLayoutId();// 声明抽象方法getLayoutId，获取布局ID protected abstract int getWidgetType();// 声明抽象方法getWidgetType }