ProgressDialog : how to prevent Leaked Window

Use:

progressDialog.dismiss();

in end work

There are situations when you have to verify in onDetach or in onDestroy if the progress dialog is still visible. Like so:

@Override
public void onDetach() {
    if (mProgressDialog != null && mProgressDialog.isShowing())
        mProgressDialog.dismiss();
    super.onDetach();
}

The leak comes probably from your PixelRainActivity.staticThis attribute. If you’re keeping a reference to an activity, even after that this activity has been destroyed, you have a memory leak.

The easiest way to fix is to use the application’s Context instead. Change your staticThis = this line in the method onCreate() to staticThis = this.getApplicationContext() and it should work (and change the type of staticThis to Context if this is not already the case)