HomeScreen重启后冻结小部件

时间:2014-01-04 16:42:15

标签: android android-widget android-pendingintent android-appwidget android-remoteview

我创建了一个小部件,可以使用存储在SharedPreferences中的不同设置进行多次实例化。在配置活动(Multiple, configurable widgets - update issue)之后直接解决了非更新小部件的初始问题后,一切似乎都正常。但。当主屏幕应用程序被杀/重启(我的情况下是Trebuchet,Android 4.3和4.2.2)小部件未刷新且onClick侦听器消失(onUpdate操作未被触发)。我只看到xml默认的非更新布局的无响应空WigdetView。更奇怪的是 - 手机重启后或添加我的小部件的另一个实例后 - 一切正常。

我已经尝试了很多不同的方法来解决这个奇怪的问题(比如单一引用RemoteViews,使用Service而不是AsyncTask等) - 但这些想法都没有解决问题..

代码中有很多重要的逻辑,快捷方式:

的AppWidgetProvider

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {  
// ASYNCTASK WAY    
    new DownloadTask(context, appWidgetManager).execute("http://sampleurl/");
/*      
// OR SERVICE WAY   
// SERVICE LOGIC IS ALMOST THE SAME AS IN DownloadTask              
    ComponentName thisWidget = new ComponentName(context, MyWidget.class);
    int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
    Intent intent = new Intent(context.getApplicationContext(), UpdateWidgetService.class);
    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);
    context.startService(intent);
*/      
}

@Override
public void onReceive(Context context, Intent intent){
    Bundle extras = intent.getExtras();

    int mAppWidgetId=0;;

    if (extras != null) {
        mAppWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
    }

    String action = intent.getAction();
    if (action.equals("PreferencesUpdated")) {
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_lay);
        views.setViewVisibility(R.id.menuLayout, View.GONE);
        appWidgetManager.updateAppWidget(mAppWidgetId, views);
        int[] appWidgetIds = new int[] {mAppWidgetId};
        onUpdate(context, appWidgetManager, appWidgetIds);
    }
    else if (action.equals("ShowMenu")) {
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_lay);
        views.setViewVisibility(R.id.menuLayout, View.VISIBLE);
        appWidgetManager.updateAppWidget(mAppWidgetId, views);
    }   
    super.onReceive(context, intent);
}

DownloadTask

public DownloadTask(Context context, AppWidgetManager appWidgetManager) {
    this.context = context;
    this.appWidgetManager = appWidgetManager;
}

@Override
protected String doInBackground(String... url) {
    // 1. DOWNLOAD FILE
    // 2. PROCESS FILE, ADD TO DATABASE, ETC

    // 3. UPDATE ALL WIDGETS
        ComponentName thisWidget = new ComponentName(context, MyWidget.class);
        int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
        for (int widgetId : allWidgetIds) {
            SharedPreferences settings = context.getSharedPreferences(PREFS_NAME, 0);
            int myPref= settings.getInt("myPref"+widgetId, -1);
            if(myPref!= -1){
                Log.d("DownloadTask", "widget id:"+widgetId);
                updateWidget(db, widgetId, selectedStation);
            }
        }
        db.close();

    return null;
}

@Override
protected void onPreExecute() {
  super.onPreExecute();

  //SHOW PROGRESSBAR (LOADER) ON ALL WIDGETS
  //ADD onClicks
  ComponentName thisWidget = new ComponentName(context, MyWidget.class);
  RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_lay);
  int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
  for (int widgetId : allWidgetIds) {
      views.setViewVisibility(R.id.progressLayout, View.VISIBLE);
      views.setOnClickPendingIntent(R.id.linearLayout1, getMenuPendingIntent(context, widgetId));
      views.setOnClickPendingIntent(R.id.refreshButton, getRefreshPendingIntent(context, widgetId));
      views.setOnClickPendingIntent(R.id.settingsButton, getSettingsPendingIntent(context, widgetId));
      appWidgetManager.updateAppWidget(widgetId, views);
  }
}

@Override
protected void onPostExecute(String result) {
   super.onPostExecute(result);

   //HIDE PROGRESSBAR (LOADER) ON ALL WIDGETS
   ComponentName thisWidget = new ComponentName(context, MyWidget.class);
   RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_lay);
   views.setViewVisibility(R.id.progressLayout, View.INVISIBLE);
   appWidgetManager.updateAppWidget(thisWidget, views);

   if (exception){
       Toast.makeText(context, context.getString(R.string.net_exc), Toast.LENGTH_LONG).show();
   }
}


public void updateWidget(MySQLiteHelper db, int widgetId, int myPref){
    // UPDATE SINGLE WIDGET
    RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_lay);
    views.setTextViewText(R.id.someText, "someText");
    // ETC
    appWidgetManager.updateAppWidget(widgetId, views);
}

我真的希望你们可以帮助我,因为我被困住了。

PS。这是所有小部件一起刷新的预期行为。

1 个答案:

答案 0 :(得分:1)

遇到类似问题后,我的小部件在重启启动器/主屏幕后无法正常工作,这里有一个可能的解决方案:

  • 每次访问RemoteView时,请再次设置.setOnClickPendingIntent(...)

基本上,在您修改onReceive()的{​​{1}}中添加相应的行以添加RemoteViews,以及您可能修改这些行的其他任何地方。

<强> PS:
您可以删除for循环迭代所有widgetIds并只使用

PendingIntent

一次更新所有观看次数。