我想在拖动的同时改变TextView的位置

<TextView
    android:id="@+id/myTextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    android:layout_marginLeft="50dp"
    android:layout_marginTop="50dp" />

TextView myTextView = findViewById(R.id.myTextView);
myTextView.setOnTouchListener(new View.OnTouchListener() {
    private float lastX, lastY;

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                lastX = event.getRawX();
                lastY = event.getRawY();
                break;
            case MotionEvent.ACTION_MOVE:
                float deltaX = event.getRawX() - lastX;
                float deltaY = event.getRawY() - lastY;
                float newX = v.getX() + deltaX;
                float newY = v.getY() + deltaY;
                v.setX(newX);
                v.setY(newY);
                lastX = event.getRawX();
                lastY = event.getRawY();
                break;
        }
        return true;
    }
});