Bound a View to drag inside RelativeLayout

Question

I have created a draggable view inside RelativeLayout. But it seems to go beyond the RelativeLayout.

I simply

Answer 1

In OnTouch you calculate where to move your view

case MotionEvent.ACTION_MOVE:
            v.animate()
                    .x(event.getRawX() + dX)
                    .y(event.getRawY() + dY)
                    .setDuration(0)
                    .start();

You should check the boundaries for x and y before moving it.

case MotionEvent.ACTION_MOVE:
        float x = event.getRawX() + dX; float y = event.getRawY() + dY;
        if (x > boundaryRight) x = boundaryRight;
        else if (x < boundaryLeft) x = boundaryLeft;
        if (y < boundaryTop) y = boundaryTop;
        else if (y > boundaryBottom) y = boundaryBottom;
        v.animate()
                .x(x)
                .y(y)
                .setDuration(0)
                .start();

And to calculate boundaries of your RelativeLayout at run-time you should use Runnable or a Listener or similar Determining the size of an Android view at runtime