collection disappears on kitkat

I developed a widget for Android, using the listview-collection (only with one entry in order to enable scrolling). It updates itself every day. It works well, but it disappears sometimes. I don't get any error message in the LogCat and I can darg it around and resize it, but it's transparent. But after some hours it appears again.

That bug appears on a Smartphone with Android 4.1.2 (when I rotate the screen, too) and on an Android 4.4.2 Tablet

some Code:

AppWidgetProvider:

public class Widget extends AppWidgetProvider {

    @Override
    public void onEnabled(Context context) {
        super.onEnabled(context);
        //set first alarm
        AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);
        PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+100, pi);
    }



  @SuppressLint("NewApi") @Override
  public void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds) {

    // Get all ids
    ComponentName thisWidget = new ComponentName(context,Widget.class);
    int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);

    for(int widgetId: allWidgetIds){
        //which layout to show on widget
        RemoteViews remoteViews = new RemoteViews(context.getPackageName(),R.layout.widget_layout);

        //RemoteViews Service needed to provide adapter for ListView
        Intent svcIntent = new Intent(context, WidgetService.class);
        //passing app widget id to that RemoteViews Service
        svcIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);

        //setting adapter to listview of the widget
        remoteViews.setRemoteAdapter(R.id.listViewWidget,svcIntent);
        //setting views
        remoteViews.setEmptyView(R.id.listViewWidget, R.id.update);
        remoteViews.setTextViewText(R.id.update_list_head, getText(context)[0]);
        remoteViews.setTextViewText(R.id.update_list_content, getText(context)[1]);

        appWidgetManager.updateAppWidget(widgetId, remoteViews);
    }

    super.onUpdate(context, appWidgetManager, appWidgetIds);


  }

  public static String[] getText(Context context){
    String[] text  = null;
    //read a file ...
    return text;
  } 
}

getViewAt(int position) in RemoteViewsFactory

@Override
public RemoteViews getViewAt(int position) {

    SharedPreferences shPref = PreferenceManager.getDefaultSharedPreferences(context);
    final RemoteViews remoteView = new RemoteViews(context.getPackageName(), R.layout.list_row);

    int bgColor = Color.parseColor(shPref.getString("background-list-widget", "#E8E8E8"));
    remoteView.setInt(R.id.list_row, "setBackgroundColor", bgColor);

    int textColor = Color.parseColor(shPref.getString("color-list-widget", "#000000"));
    remoteView.setInt(R.id.update_list_content, "setTextColor", textColor); 
    remoteView.setInt(R.id.update_list_head, "setTextColor", textColor);

    float size;
    try {
         size = Float.parseFloat(shPref.getString("text-size-widget", "12"));
    } catch (Exception e) {
         size = 12;
    }   

    remoteView.setFloat(R.id.update_list_content, "setTextSize", size);
    remoteView.setFloat(R.id.update_list_head, "setTextSize", size);

    remoteView.setTextViewText(R.id.update_list_head, Widget.getText(context)[0]);
    remoteView.setTextViewText(R.id.update_list_content,Widget.getText(context)[1]);

    return remoteView;
}

BroadcastReceiver:

public class AlarmManagerBroadcastReceiver extends BroadcastReceiver {

    @SuppressLint({ "Wakelock", "NewApi" }) @Override
    public void onReceive(Context context, Intent intent) {

        PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
        PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "updateWidget");
        //Acquire the lock
        wl.acquire();

        //update remote views.
        RemoteViews remoteViews = new RemoteViews(context.getPackageName(),R.layout.widget_layout);
        remoteViews.setEmptyView(R.id.listViewWidget, R.id.update);
        remoteViews.setTextViewText(R.id.update_list_head, Widget.getText(context)[0]);
        remoteViews.setTextViewText(R.id.update_list_content, Widget.getText(context)[1]);

        ComponentName thiswidget = new ComponentName(context, Widget.class);
        AppWidgetManager manager = AppWidgetManager.getInstance(context);
        manager.updateAppWidget(thiswidget, remoteViews);
        //Release the lock
        wl.release();

        //set next alarm
        AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        Intent mIntent = new Intent(context, AlarmManagerBroadcastReceiver.class);
        PendingIntent pi = PendingIntent.getBroadcast(context, 0, mIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.SECOND, 10);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.HOUR, 0);
        calendar.set(Calendar.AM_PM, Calendar.AM);
        calendar.add(Calendar.DAY_OF_MONTH, 1);

        am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pi);

    }
}

Thank you!

---

我通过使用notifydatasetchanged（）解决了这个问题

链接地址: http://www.djcxy.com/p/8940.html

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