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@ -32,19 +32,31 @@ 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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/**
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* 便签桌面小部件的基类,提供了小部件的核心功能实现
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* 继承自AppWidgetProvider,处理小部件的创建、更新和删除等操作
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*/
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public abstract class NoteWidgetProvider extends AppWidgetProvider {
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// 定义查询便签内容时需要的字段
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public static final String [] PROJECTION = new String [] {
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NoteColumns.ID,
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NoteColumns.BG_COLOR_ID,
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NoteColumns.SNIPPET
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NoteColumns.ID, // 便签ID
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NoteColumns.BG_COLOR_ID, // 便签背景色ID
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NoteColumns.SNIPPET // 便签摘要内容
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};
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// 投影列的索引常量,方便从Cursor中获取对应数据
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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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private static final String TAG = "NoteWidgetProvider";
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/**
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* 当小部件被删除时调用此方法
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* 将对应便签的widget_id字段置为INVALID_APPWIDGET_ID,表示该便签不再关联小部件
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* @param context 上下文
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* @param appWidgetIds 被删除的小部件ID数组
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*/
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@Override
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public void onDeleted(Context context, int[] appWidgetIds) {
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ContentValues values = new ContentValues();
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@ -57,6 +69,12 @@ public abstract class NoteWidgetProvider extends AppWidgetProvider {
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}
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}
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/**
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* 获取指定小部件ID对应的便签信息
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* @param context 上下文
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* @param widgetId 小部件ID
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* @return 返回包含便签信息的Cursor,或null(如果查询失败)
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*/
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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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@ -65,68 +83,109 @@ public abstract class NoteWidgetProvider extends AppWidgetProvider {
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null);
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}
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/**
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* 更新小部件(非隐私模式)
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* @param context 上下文
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* @param appWidgetManager AppWidgetManager实例
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* @param appWidgetIds 需要更新的小部件ID数组
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*/
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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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/**
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* 更新小部件显示内容
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* @param context 上下文
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* @param appWidgetManager AppWidgetManager实例
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* @param appWidgetIds 需要更新的小部件ID数组
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* @param privacyMode 是否为隐私模式(隐私模式下显示通用提示,隐藏具体便签内容)
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*/
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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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int bgId = ResourceParser.getDefaultBgId(context);
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String snippet = "";
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int bgId = ResourceParser.getDefaultBgId(context); // 默认背景色ID
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String snippet = ""; // 便签内容摘要
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// 创建启动便签编辑页面的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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// 查询小部件对应的便签内容
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Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
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if (c != null && c.moveToFirst()) {
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// 检查是否存在多个便签关联同一个小部件ID的异常情况
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if (c.getCount() > 1) {
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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中获取便签内容和背景色
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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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intent.setAction(Intent.ACTION_VIEW); // 设置Intent动作为查看已有便签
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} else {
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// 如果没有找到对应便签,显示默认提示信息
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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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intent.setAction(Intent.ACTION_INSERT_OR_EDIT); // 设置Intent动作为新建便签
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}
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// 确保Cursor被关闭,防止内存泄漏
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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,用于设置小部件的显示内容
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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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* 生成用于启动小部件宿主的PendingIntent
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* 根据是否为隐私模式,设置不同的点击行为
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*/
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PendingIntent pendingIntent = null;
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if (privacyMode) {
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// 隐私模式下显示提示信息,点击后跳转到便签列表
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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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// 正常模式下显示便签内容,点击后跳转到便签编辑页
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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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// 设置小部件的点击事件
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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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/**
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* 获取背景资源ID(由子类实现)
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* @param bgId 背景色ID
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* @return 对应的资源ID
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*/
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protected abstract int getBgResourceId(int bgId);
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/**
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* 获取小部件布局ID(由子类实现)
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* @return 布局资源ID
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*/
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protected abstract int getLayoutId();
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/**
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* 获取小部件类型(由子类实现)
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* @return 小部件类型常量
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*/
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protected abstract int getWidgetType();
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}
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}
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