how to scroll to top after showing a long big ScrollView?

=======in your activity,override the  onWindowFocusChanged event=============

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        ScrollView scrollView = (ScrollView) findViewById(R.id.someScrollView);
        scrollView.scrollTo(0, 0);
    }

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