바탕화면에 항상 떠 있는 뷰의 이동

출처: http://itmir.tistory.com/548

private float mTouchX, mTouchY;

private int mViewX, mViewY;

 

private OnTouchListener mViewTouchListener = new OnTouchListener() {

    @Override

    public boolean onTouch(View v, MotionEvent event) {

 

        switch (event.getAction()) {

        case MotionEvent.ACTION_DOWN:

 

            mTouchX = event.getRawX();

            mTouchY = event.getRawY();

            mViewX = mParams.x;

            mViewY = mParams.y;

 

            break;

 

        case MotionEvent.ACTION_UP:

            break;

 

        case MotionEvent.ACTION_MOVE:

            int x = (int) (event.getRawX() - mTouchX);

            int y = (int) (event.getRawY() - mTouchY);

 

            mParams.x = mViewX + x;

            mParams.y = mViewY + y;

 

            mManager.updateViewLayout(mView, mParams);

 

            break;

        }

 

        return true;

    }

};