//Edited by mythou

　　private void createFloatView()
    {
                Button btn_floatView = new Button()
        btn_floatView = new Button(getApplicationContext());
        btn_floatView.setText("懸浮窗");

        wm = (WindowManager) getApplicationContext().getSystemService(
                Context.WINDOW_SERVICE);
        
 
params = new WindowManager.LayoutParams();

        // 設定window type
        params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
        /*
         * 如果設定為params.type = WindowManager.LayoutParams.TYPE_PHONE; 那麼優先順序會降低一些,
         * 即拉下通知欄不可見
         */

        params.format = PixelFormat.RGBA_8888; //
 
 設定圖片格式，效果為背景透明

        // 設定Window flag
        params.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        /*
         * 下面的flags屬性的效果形同“鎖定”。 懸浮窗不可觸控，不接受任何事件,同時不影響後面的事件響應。
         * wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL |
         * LayoutParams.FLAG_NOT_FOCUSABLE | LayoutParams.FLAG_NOT_TOUCHABLE;
         
 
*/

        // 設定懸浮窗的長得寬
        params.width = 100;
        params.height = 100;

        // 設定懸浮窗的Touch監聽
        btn_floatView.setOnTouchListener(new OnTouchListener()
        {
            int lastX, lastY;
            int paramX, paramY;

            public boolean onTouch(View v, MotionEvent event)
            {
                switch (event.getAction())
                {
                case MotionEvent.ACTION_DOWN:
                    lastX = (int) event.getRawX();
                    lastY = (int) event.getRawY();
                    paramX = params.x;
                    paramY = params.y;
                    break;
                case MotionEvent.ACTION_MOVE:
                    int dx = (int) event.getRawX() - lastX;
                    int dy = (int) event.getRawY() - lastY;
                    params.x = paramX + dx;
                    params.y = paramY + dy;
                    // 更新懸浮窗位置
                    wm.updateViewLayout(btn_floatView, params);
                    break;
                }
                return true;
            }
        });

        wm.addView(btn_floatView, params);
        isAdded = true;
    }