Android: Dragging Popup Window 可移动浮动View

 final View cv = new View(this);
    setContentView(cv);

    TextView tv = new TextView(this);
    tv.setBackgroundColor(0xffeeeeee);
    tv.setTextColor(0xff000000);
    tv.setTextSize(24);
    tv.setText("click me
then drag me");
    tv.setPadding(8, 8, 8, 8);
    mPopup = new PopupWindow(tv, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

    OnTouchListener otl = new OnTouchListener() {
        private float mDx;
        private float mDy;

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            int action = event.getAction();
            if (action == MotionEvent.ACTION_DOWN) {
                mDx = mCurrentX - event.getRawX();
                mDy = mCurrentY - event.getRawY();
            } else
            if (action == MotionEvent.ACTION_MOVE) {
                mCurrentX = (int) (event.getRawX() + mDx);
                mCurrentY = (int) (event.getRawY() + mDy);
                mPopup.update(mCurrentX, mCurrentY, -1, -1);
            }
            return true;
        }
    };
    tv.setOnTouchListener(otl);

    mCurrentX = 20;
    mCurrentY = 50;
    cv.post(new Runnable() {
        @Override
        public void run() {
            mPopup.showAtLocation(cv, Gravity.NO_GRAVITY, mCurrentX, mCurrentY);
        }
    });

或者：

layout_counter.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent event)
        {
            if (currentState != State.EDIT_MOVE) return false;

            FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) view.getLayoutParams();
            if (view.getId() != R.id.layout_counter) return false;

            switch (event.getAction())
            {
                case MotionEvent.ACTION_MOVE:
                    params.topMargin = (int) event.getRawY() - view.getHeight();
                    params.leftMargin = (int) event.getRawX() - (view.getWidth() / 2);
                    view.setLayoutParams(params);
                    break;

                case MotionEvent.ACTION_UP:
                    params.topMargin = (int) event.getRawY() - view.getHeight();
                    params.leftMargin = (int) event.getRawX() - (view.getWidth() / 2);
                    view.setLayoutParams(params);
                    break;

                case MotionEvent.ACTION_DOWN:
                    view.setLayoutParams(params);
                    break;
            }

            return true;
        }
    });

或者：

public class MyActivity extends Activity implements View.OnTouchListener {

TextView _view;
ViewGroup _root;
private int _xDelta;
private int _yDelta;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    _root = (ViewGroup)findViewById(R.id.root);

    _view = new TextView(this);
    _view.setText("TextView!!!!!!!!");

    RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(150, 50);
    layoutParams.leftMargin = 50;
    layoutParams.topMargin = 50;
    layoutParams.bottomMargin = -250;
    layoutParams.rightMargin = -250;
    _view.setLayoutParams(layoutParams);

    _view.setOnTouchListener(this);
    _root.addView(_view);
}

public boolean onTouch(View view, MotionEvent event) {
    final int X = (int) event.getRawX();
    final int Y = (int) event.getRawY();
    switch (event.getAction() & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN:
            RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
            _xDelta = X - lParams.leftMargin;
            _yDelta = Y - lParams.topMargin;
            break;
        case MotionEvent.ACTION_UP:
            break;
        case MotionEvent.ACTION_POINTER_DOWN:
            break;
        case MotionEvent.ACTION_POINTER_UP:
            break;
        case MotionEvent.ACTION_MOVE:
            RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
            layoutParams.leftMargin = X - _xDelta;
            layoutParams.topMargin = Y - _yDelta;
            layoutParams.rightMargin = -250;
            layoutParams.bottomMargin = -250;
            view.setLayoutParams(layoutParams);
            break;
    }
    _root.invalidate();
    return true;
}}