Android WebView not stopping after user presses back

try this, hope it helps:

@Override
public void onPause() {
    myWebView.onPause();
    myWebView.pauseTimers();//this may cause adMob to stop working
    super.onPause();
}

@Override
public void onResume() {
    super.onResume();
    myWebView.resumeTimers();
    myWebView.onResume();
}


@Override
protected void onDestroy() {
    myWebView.destroy();
    myWebView = null;
    super.onDestroy();
}