/* * 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 * * 代码功能:小米便签桌面小部件提供者基类 * 主要负责: * 1. 管理小部件的生命周期(创建/删除) * 2. 更新小部件显示内容 * 3. 处理点击事件与便签的交互 */ 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 { // 数据库查询投影(需要获取的列) public static final String[] PROJECTION = new String[]{ NoteColumns.ID, // 便签ID NoteColumns.BG_COLOR_ID, // 背景颜色ID NoteColumns.SNIPPET // 内容摘要 }; // 投影列的索引常量 public static final int COLUMN_ID = 0; public static final int COLUMN_BG_COLOR_ID = 1; public static final int COLUMN_SNIPPET = 2; private static final String TAG = "NoteWidgetProvider"; // 日志标签 @Override public void onDeleted(Context context, int[] appWidgetIds) { // 当小部件被删除时,清空关联的widget ID ContentValues values = new ContentValues(); values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); for (int appWidgetId : appWidgetIds) { // 更新数据库,将对应widget ID设为无效 context.getContentResolver().update( Notes.CONTENT_NOTE_URI, values, NoteColumns.WIDGET_ID + "=?", new String[]{String.valueOf(appWidgetId)} ); } } // 获取指定widget关联的便签信息 private Cursor getNoteWidgetInfo(Context context, int widgetId) { return context.getContentResolver().query( Notes.CONTENT_NOTE_URI, PROJECTION, // 查询条件:匹配widget ID且不在回收站 NoteColumns.WIDGET_ID + "=? AND " + NoteColumns.PARENT_ID + "<>?", new String[]{String.valueOf(widgetId), String.valueOf(Notes.ID_TRASH_FOLER)}, null ); } // 更新小部件显示内容(公开方法) protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) { update(context, appWidgetManager, appWidgetIds, false); } // 实际更新逻辑(私有方法) private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds, boolean privacyMode) { for (int appWidgetId : appWidgetIds) { if (appWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID) continue; // 默认背景和内容 int bgId = ResourceParser.getDefaultBgId(context); String snippet = ""; // 准备跳转到编辑页面的Intent Intent intent = new Intent(context, NoteEditActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetId); intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType()); // 查询数据库获取便签信息 try (Cursor c = getNoteWidgetInfo(context, appWidgetId)) { if (c != null && c.moveToFirst()) { if (c.getCount() > 1) { Log.e(TAG, "发现重复的widget ID关联多个便签: " + appWidgetId); return; // 发现数据异常直接返回 } // 获取数据库中的内容 snippet = c.getString(COLUMN_SNIPPET); bgId = c.getInt(COLUMN_BG_COLOR_ID); intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID)); intent.setAction(Intent.ACTION_VIEW); // 查看模式 } else { // 无关联便签时的默认提示 snippet = context.getString(R.string.widget_havenot_content); intent.setAction(Intent.ACTION_INSERT_OR_EDIT); // 新建模式 } } // 构建RemoteViews对象 RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId()); // 设置背景资源 rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId)); intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId); // 构建PendingIntent PendingIntent pendingIntent; if (privacyMode) { // 隐私模式:显示提示文字,点击进入列表页 rv.setTextViewText(R.id.widget_text, context.getString(R.string.widget_under_visit_mode)); pendingIntent = PendingIntent.getActivity( context, appWidgetId, new Intent(context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT ); } else { // 正常模式:显示便签内容,点击进入编辑页 rv.setTextViewText(R.id.widget_text, snippet); pendingIntent = PendingIntent.getActivity( context, appWidgetId, intent, PendingIntent.FLAG_UPDATE_CURRENT ); } // 设置点击事件 rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent); // 更新小部件 appWidgetManager.updateAppWidget(appWidgetId, rv); } } // 抽象方法(需要子类实现) protected abstract int getBgResourceId(int bgId); // 获取实际背景资源ID protected abstract int getLayoutId(); // 获取小部件布局ID protected abstract int getWidgetType(); // 获取小部件类型标识 }