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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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public abstract class NoteWidgetProvider extends AppWidgetProvider { /*定义查询数据库时需要获取的列名数组*/
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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, /*背景颜色ID*/
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NoteColumns.SNIPPET /*笔记片段*/
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};
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/*列索引常量，方便后续使用*/
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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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/*日志标签*/
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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) { /*当小部件被删除时，更新数据库中的 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查询笔记信息*/
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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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/*更新小部件的显示内容*/
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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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/*更新小部件的显示内容，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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/*初始化背景颜色ID和笔记片段*/
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int bgId = ResourceParser.getDefaultBgId(context);
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String snippet = "";
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/*创建一个 Intent 用于启动 NoteEditActivity*/
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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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/*查询数据库获取笔记信息*/
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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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/*如果有多个笔记与同一个小部件ID关联，记录错误并返回*/
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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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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，显示默认的“没有内容”消息*/
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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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/*创建 RemoteViews 对象，用于更新小部件的 UI*/
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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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/**
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* Generate the pending intent to start host for the widget
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*/
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/*创建 PendingIntent 用于启动 Activity*/
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PendingIntent pendingIntent = null;
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if (privacyMode) {
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/*如果启用隐私模式，显示特定的隐私模式文本*/
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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，显示笔记片段*/
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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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/*设置点击小部件时触发的 PendingIntent*/
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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：获取背景资源ID*/
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protected abstract int getBgResourceId(int bgId);
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/*抽象方法：获取布局资源ID*/
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protected abstract int getLayoutId();
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/*抽象方法：获取小部件类型*/
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protected abstract int getWidgetType();
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}
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