public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) { 
     RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.main); 
     ComponentName thisWidget = new ComponentName(context, PhotoWidgetProvider.class); 
     boolean mExternalStorageWriteable = false; 
     String state = Environment.getExternalStorageState(); 
     if (Environment.MEDIA_MOUNTED.equals(state))
          mExternalStorageWriteable = true;  
     if(mExternalStorageWriteable) {
          BitmapFactory.Options options = new BitmapFactory.Options(); 
          options.inSampleSize = 2;
          //of course it's a sample filename 
          String fileName = Environment.getExternalStorageDirectory().getPath() + "/DCIM/100MEDIA/IMAG0159.jpg"; 
          Bitmap bitmap = BitmapFactory.decodeFile(fileName, options); 
          remoteViews.setImageViewBitmap(R.id.widget_imageview, bitmap);
          appWidgetManager.updateAppWidget(thisWidget, remoteViews);
     } 
}