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+    @SuppressLint("CommitPrefEdits")
      @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB)
      @Synthetic void persistPosition() {
          getPreferences()
                 .edit()
                 .putFloat(mPreferenceX, getX())
                 .putFloat(mPreferenceY, getY())
                 .apply();
     }