android: move a view on touch move (ACTION_MOVE)

Question

I\'d like to do a simple control: a container with a view inside. If I touch the container and I move the finger, I want to move the view to follow my finger.

What

Answer 1

Touch the container and the view will follow your finger.

xml code

Java code

public class DashBoardActivity extends Activity implements View.OnClickListener, View.OnTouchListener {

    float dX;
    float dY;
    int lastAction;
    LinearLayout floatingLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dashboard);

        floatingLayout = findViewById(R.id.floating_layout);
        floatingLayout.setOnTouchListener(this);    



     @Override
    public boolean onTouch(View view, MotionEvent event) {
        switch (event.getActionMasked()) {
            case MotionEvent.ACTION_DOWN:
                dX = view.getX() - event.getRawX();
                dY = view.getY() - event.getRawY();
                lastAction = MotionEvent.ACTION_DOWN;
                break;

            case MotionEvent.ACTION_MOVE:
                view.setY(event.getRawY() + dY);
                view.setX(event.getRawX() + dX);
                lastAction = MotionEvent.ACTION_MOVE;
                break;

            case MotionEvent.ACTION_UP:
                if (lastAction == MotionEvent.ACTION_DOWN)
                    Toast.makeText(DashBoardActivity.this, "Clicked!", Toast.LENGTH_SHORT).show();
                break;

            default:
                return false;
        }
        return true;
    }
}