public class WindowService extends Service implements OnClickListener {

    private WindowManager wManager;// 視窗管理者
    private WindowManager.LayoutParams mParams;// 視窗的屬性
    private MyView myView;
    private boolean flag = true;

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
 

        return null;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        wManager = (WindowManager) getApplicationContext().getSystemService(
                Context.WINDOW_SERVICE);
        mParams = new WindowManager.LayoutParams();
        mParams.type 
 
= WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;// 系統提示window
        mParams.format = PixelFormat.TRANSLUCENT;// 支援透明
        //mParams.format = PixelFormat.RGBA_8888;
        mParams.flags |= WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;// 焦點
        mParams.width = 490;//視窗的寬和高
        mParams.height = 160;
        mParams.x 
 
= 0;//視窗位置的偏移量
        mParams.y = 0;
        //mParams.alpha = 0.1f;//視窗的透明度
        myView = new MyView(this);
        myView.setOnClickListener(this);
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub
        if (flag) {
            flag = false;
            wManager.addView(myView, mParams);//新增視窗
        }
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        if (myView.getParent() != null)
            wManager.removeView(myView);//移除視窗
        super.onDestroy();
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if (v.equals(myView)) {
            flag = true;
            if (myView.getParent() != null)
                wManager.removeView(myView);//移除視窗
        }
    }

}