Android: ScrollView force to bottom

you should run the code inside the scroll.post like this:

scroll.post(new Runnable() {            
    @Override
    public void run() {
           scroll.fullScroll(View.FOCUS_DOWN);              
    }
});

scroll.fullScroll(View.FOCUS_DOWN) will lead to the change of focus. That will bring some strange behavior when there are more than one focusable views, e.g two EditText. There is another way for this question.

    View lastChild = scrollLayout.getChildAt(scrollLayout.getChildCount() - 1);
    int bottom = lastChild.getBottom() + scrollLayout.getPaddingBottom();
    int sy = scrollLayout.getScrollY();
    int sh = scrollLayout.getHeight();
    int delta = bottom - (sy + sh);

    scrollLayout.smoothScrollBy(0, delta);

This works well.

Kotlin Extension

fun ScrollView.scrollToBottom() {
    val lastChild = getChildAt(childCount - 1)
    val bottom = lastChild.bottom + paddingBottom
    val delta = bottom - (scrollY+ height)        
    smoothScrollBy(0, delta)
}

scroll.fullScroll(View.FOCUS_DOWN) also should work.

Put this in a scroll.Post(Runnable run)

Kotlin Code

scrollView.post {
   scrollView.fullScroll(View.FOCUS_DOWN)
}

Sometimes scrollView.post doesn't work

 scrollView.post(new Runnable() {
        @Override
        public void run() {
            scrollView.fullScroll(ScrollView.FOCUS_DOWN);
        }
    });

BUT if you use scrollView.postDelayed, it will definitely work

 scrollView.postDelayed(new Runnable() {
        @Override
        public void run() {
            scrollView.fullScroll(ScrollView.FOCUS_DOWN);
        }
    },1000);