How can I Animate the color change of the statusbar and toolbar (like the new Calendar app does)

Question

The new Google Calendar app has an animation I would like to do in my app. When you create a new event you can choose a color for the event. When you do, the statusbar and too

Answer 1

Try this, it works great for me and it gets the same effect Google Calendar app does.

private void reveal(CollapsingToolbarLayout toolbarLayout, int colorPrimary, int colorPrimaryDark){
    // get the center for the clipping circle
    int cx = toolbarLayout.getWidth() / 2;
    int cy = toolbarLayout.getHeight() / 2;

    // get the final radius for the clipping circle
    float finalRadius = (float) Math.hypot(cx, cy);

    // create the animator for this view (the start radius is zero)
    Animator anim =
            ViewAnimationUtils.createCircularReveal(toolbarLayout, cx, cy, 0, finalRadius);

    // make the view visible and start the animation
    toolbarLayout.setBackgroundColor(colorPrimary);
    anim.start();
    Window window = getWindow();
    window.setStatusBarColor(colorPrimaryDark);
    toolbarLayout.setContentScrimColor(colorPrimary);
}