Android - Zoom animation using AnimatorSet

Question

The official Zooming a View tutorial uses an AnimatorSet to zoom into a View. It creates the illusion of downward movement as the view expands. Later, the

Answer 1

Ok, I think you want a zoom out with upward movement from your images and description. I cant understand your code, it seems too much complex to me (I am a noob). Now I have done what you want using the following code. At first I declare a relative layout with an image view, this relative layout will be the container. I set initial width height, but we will change it later from code.

Now In Activity I set a listener for layout change so that I can get the actual size of the container. Then set the the layout for ImageView.

public class MainActivity extends Activity {
    ImageView im;
    RelativeLayout container;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Logger.init().hideThreadInfo().setMethodCount(0);

        setContentView(R.layout.activity_main);
        im = (ImageView) findViewById(R.id.imageView);
        container = (RelativeLayout) findViewById(R.id.container);
        container.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                setInitialPos();
                container.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            }
        });

    }

    int width;
    int height;
    int topMargin;

    private void setInitialPos() {
        Logger.e("container: " + container.getWidth() + " x " + container.getHeight());
        width = container.getWidth();
        height = 400;
        RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) im.getLayoutParams();
        layoutParams.width = width;
        layoutParams.height = height;
        topMargin = (container.getHeight() - height) / 2;
        layoutParams.topMargin = topMargin;
        im.setLayoutParams(layoutParams);

        startAnimation();
    }

We have to animate three things here, width, height and topMargin (for positioning). So, I declare three variable for initial position of animator and I calculate them on initial layoutsetup. Now we need to animate these three variables simultaneously which is easy.

    private void startAnimation() {
        AnimatorSet animator = new AnimatorSet();

        Animator widthAnimator = ObjectAnimator.ofInt(this, "width", width, 200);
        widthAnimator.setInterpolator(new LinearInterpolator());

        Animator heightAnimator = ObjectAnimator.ofInt(this, "height", height, 100);
        heightAnimator.setInterpolator(new LinearInterpolator());

        Animator marginAnimator = ObjectAnimator.ofInt(this, "topMargin", topMargin, 0);
        marginAnimator.setInterpolator(new LinearInterpolator());

        animator.playTogether(widthAnimator, heightAnimator, marginAnimator);
        animator.setDuration(3000);
        animator.start();
    }

    public void setWidth(int w) {
        RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) im.getLayoutParams();
        layoutParams.width = w;
        im.setLayoutParams(layoutParams);
    }

    public void setHeight(int h) {
        RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) im.getLayoutParams();
        layoutParams.height = h;
        im.setLayoutParams(layoutParams);
    }

    public void setTopMargin(int m) {
        RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) im.getLayoutParams();
        layoutParams.topMargin = m;
        im.setLayoutParams(layoutParams);
    }
}