尝试在 onResume 和 onPause 方法中添加一些代码

Try to have some code in onResume and onPause methods

@Override
public void onResume() {
    super.onResume();
    isOnline(true);
    }
}


@Override
public void onPause() {
    super.onPause();
    isOnline(false);
}