android项目浮窗的移动

wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
        final WindowManager.LayoutParams params = new WindowManager.LayoutParams();
        params.height = WindowManager.LayoutParams.WRAP_CONTENT;
        params.width = WindowManager.LayoutParams.WRAP_CONTENT;
        params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
        params.format = PixelFormat.TRANSLUCENT;
        params.type = WindowManager.LayoutParams.TYPE_PHONE;
        params.gravity = Gravity.LEFT+Gravity.TOP;
        params.setTitle("Toast");
        SharedPreferences sharedPreferences = getSharedPreferences("xy", 0);
        int backX = sharedPreferences.getInt("x", 0);
        int backY = sharedPreferences.getInt("y", 0);
        //是以默认的gravity为原点的，默认的是center这里我们要重新设置gravity
        params.x = backX;
        params.y = backY;
        view = new TextView(this);
        view.setText(address);
        view.setTextSize(30f);
        view.setTextColor(Color.WHITE);
        view.setOnTouchListener(new OnTouchListener() {
            
            private int startX;
            private int startY;

            @Override
            public boolean onTouch(View arg0, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int endX = (int) event.getRawX();
                    int endY = (int) event.getRawY();

                    // 计算移动偏移量
                    int dx = endX - startX;
                    int dy = endY - startY;
                    
                    // 更新浮窗位置
                    params.x += dx;
                    params.y += dy;
                    wm.updateViewLayout(view, params);
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_UP:
                    
                    break;

                default:
                    break;
                }
                return true;
            }
        });