How to change the status bar color when scrolling

Question

I'm making an app for studies using the chucknorris api

I want that when the screen scrolls down, the status bar is transparent to match the text

Before sliding

After sliding

Answer 1

Step 1: Add a listener to scrollview

scrollView = (ScrollView) findViewById(R.id.scrollView);

    scrollView.getViewTreeObserver()
            .addOnScrollChangedListener(new 
            ViewTreeObserver.OnScrollChangedListener() {
                @Override
                public void onScrollChanged() {

                    if (!scrollView.canScrollVertically(1)) {
                        // bottom of scroll view, 
//you can change status bar color here

                    }
                    if (!scrollView.canScrollVertically(-1)) {
                        // top of scroll view


                    }
                }
            });

Step 2: change the status bar color inside scrollview listener with the following code

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    Window window = getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
    window.setStatusBarColor(Color.BLUE);
}