Can't find an animation example?

Question

Android

Then I decided to learn something new in android and remembered a cool thing on the playmarket, when you open the page, instead of the status bar, the picture, and after you go down and rise again, the status bar appears. I can not find a lesson on how to do something similar, who can help?

Answer 1

This effect is called Collapsing Toolbar with Parallax.
First we make a normal AppBarLayout with Collapsing Toolbar .
(You can customize the view for yourself)
Then we write code to check the view toolbar, in which we do what we need:

appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
            @Override
            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                if (isCollapsed(verticalOffset)) {
                    //set status bar color your color
                } else {
                    // set status bar color transparent
                }

            }
        });

    private boolean isCollapsed(int offset) {
        return offset == 0 || offset <= toolbar.getHeight();
    }