zuoye/src/net/micode/notes/widget/NoteWidgetProvider.java

/*
 * 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;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.util.Log;
import android.widget.RemoteViews;

import net.micode.notes.R;
import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.tool.ResourceParser;
import net.micode.notes.ui.NoteEditActivity;
import net.micode.notes.ui.NotesListActivity;

public abstract class NoteWidgetProvider extends AppWidgetProvider {
    // 用于查询数据库的投影列：ID、背景颜色ID和摘要信息
    public static final String[] PROJECTION = new String[] {
            NoteColumns.ID,  // 笔记的ID
            NoteColumns.BG_COLOR_ID,  // 笔记的背景颜色ID
            NoteColumns.SNIPPET  // 笔记的摘要信息
    };

    // 投影列的索引值
    public static final int COLUMN_ID = 0;
    public static final int COLUMN_BG_COLOR_ID = 1;
    public static final int COLUMN_SNIPPET = 2;

    // 日志标签
    private static final String TAG = "NoteWidgetProvider";

    // 当一个小部件被删除时调用
    @Override
    public void onDeleted(Context context, int[] appWidgetIds) {
        ContentValues values = new ContentValues();
        values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);  // 将小部件ID标记为无效

        // 更新笔记的WIDGET_ID字段，将已删除的小部件ID置为无效
        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]) });
        }
    }

    // 获取与小部件相关的笔记信息（如摘要、背景颜色ID）
    private Cursor getNoteWidgetInfo(Context context, int widgetId) {
        // 查询与小部件ID相关的笔记，排除垃圾箱文件夹的笔记
        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);
    }

    // 更新小部件内容
    protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        update(context, appWidgetManager, appWidgetIds, false);  // 默认隐私模式为关闭
    }

    // 更新小部件内容，支持隐私模式
    private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
                        boolean privacyMode) {
        for (int i = 0; i < appWidgetIds.length; i++) {
            if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {
                // 默认背景ID和摘要内容
                int bgId = ResourceParser.getDefaultBgId(context);
                String snippet = "";

                // 创建一个启动笔记编辑活动的Intent
                Intent intent = new Intent(context, NoteEditActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]);
                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType());

                // 获取小部件相关的笔记信息
                Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
                if (c != null && c.moveToFirst()) {
                    if (c.getCount() > 1) {
                        Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);
                        c.close();
                        return;
                    }
                    // 获取摘要和背景颜色ID
                    snippet = c.getString(COLUMN_SNIPPET);
                    bgId = c.getInt(COLUMN_BG_COLOR_ID);
                    intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID));  // 传递笔记ID
                    intent.setAction(Intent.ACTION_VIEW);  // 设置为查看操作
                } else {
                    // 如果没有笔记内容，设置默认提示内容
                    snippet = context.getResources().getString(R.string.widget_havenot_content);
                    intent.setAction(Intent.ACTION_INSERT_OR_EDIT);  // 设置为插入或编辑操作
                }

                // 关闭Cursor
                if (c != null) {
                    c.close();
                }

                // 设置小部件的视图
                RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
                rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId));  // 设置背景资源
                intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);  // 传递背景ID

                PendingIntent pendingIntent = null;
                if (privacyMode) {
                    // 如果是隐私模式，设置提示信息
                    rv.setTextViewText(R.id.widget_text, context.getString(R.string.widget_under_visit_mode));
                    // 设置点击事件为打开笔记列表
                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
                            context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
                } else {
                    // 否则显示笔记的摘要内容
                    rv.setTextViewText(R.id.widget_text, snippet);
                    // 设置点击事件为打开笔记编辑界面
                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
                            PendingIntent.FLAG_UPDATE_CURRENT);
                }

                // 设置小部件点击事件
                rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);

                // 更新小部件
                appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
            }
        }
    }

    // 获取背景资源ID，根据笔记的背景颜色ID来设置
    protected abstract int getBgResourceId(int bgId);

    // 获取小部件的布局ID
    protected abstract int getLayoutId();

    // 获取小部件的类型
    protected abstract int getWidgetType();
}