Question

I couldn’t find a good example for how to do this.

I have a RelativeLayout set with x height.

I want to add a button which expands the height to x+y height.

can someone refer me to a good example on how to do it programmatically?

Answer 1

Please check below new edited answer as below. But here you need to know the exact new height.

public class LayoutAnimationActivity extends Activity {
    RelativeLayout ril1;
    Button btn;
    int initialHeight;
    int actualHeight;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);
        ril1 = (RelativeLayout) findViewById(R.id.relativeLayout1);
        btn = new Button(this);
        btn.setWidth(100);
        btn.setHeight(200);
        btn.setText("Button");
        actualHeight = 210;
        Ani a = new Ani();
        a.setDuration(2000);
        ril1.startAnimation(a);
    }

    class Ani extends Animation {
        public Ani() {}

        @Override
        protected void applyTransformation(float interpolatedTime, Transformation t) {
            int newHeight;

            newHeight = (int) (initialHeight * interpolatedTime);

            ril1.removeAllViews();
            btn.setWidth(100);
            btn.setHeight(300);
            btn.setText("as");
            ril1.addView(btn);             
            ril1.getLayoutParams().height = newHeight;
            ril1.requestLayout();
        }

        @Override
        public void initialize(int width, int height, int parentWidth, int parentHeight) {
            super.initialize(width, height, parentWidth, parentHeight);
            initialHeight = actualHeight;
        }

        @Override
        public boolean willChangeBounds() {
            return true;
        }
    };
}