MyLinearLayout.java

/**
 * Created by Pamir on 09/03/2017.
 */

public class MyLinearLayout extends LinearLayout {

    private final float SCALE_PRESSED = 0.9f;
    private final float SCALE_NORMAL = 1.0f;

    private OnMyClickListener myOnClickListener;

    public MyLinearLayout(Context context) {
        super(context);
        init();
    }

    public MyLinearLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyLinearLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        setFocusable(true);
        setFocusableInTouchMode(true); // Needed to call onFocusChanged()
        setBackgroundColor(Color.BLACK);
        setClickable(true);
    }

    public void setOnMyClickListener(OnMyClickListener myOnClickListener) {
        this.myOnClickListener = myOnClickListener;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            setScale(SCALE_PRESSED);
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            setScale(SCALE_NORMAL);
        }

        gestureDetector.onTouchEvent(event);
        return super.onTouchEvent(event);
    }

    public void setScale(float scale) {
        setScaleX(scale);
        setScaleY(scale);
    }

    private GestureDetector.SimpleOnGestureListener gestureListener = new GestureDetector.SimpleOnGestureListener() {
        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            if (myOnClickListener != null) {
                myOnClickListener.onClick();
            }
            Log.v("MyButton", "TapConfirmed");
            return super.onSingleTapConfirmed(e);
        }
    };

    private GestureDetector gestureDetector = new GestureDetector(getContext(), gestureListener);

    public interface OnMyClickListener {
        void onClick();
    }
}

Scales down when takes focus, turn back to normal state when released.