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所以我在网上找到了一个例子，我用他们为我创建的蛇游戏创建的处理程序。但是，当我从主页面转到游戏视图时，我再次点击Android平板电脑并再次启动我的游戏视图，我的动画速度似乎翻了一番。 这是处理程序。处理程序如何工作？为什么我重新启动活动后动画的速度翻倍？
class RefreshHandler extends Handler { //Makes animation possible
@Override
public void handleMessage(Message msg) {
Snake.this.update();
Snake.gamePanel.invalidate();
}
public void sleep(long delayMillis) {
this.removeMessages(0);
sendMessageDelayed(obtainMessage(0), delayMillis);
}
}
这是我在我的游戏活动的oncreate过程中调用的更新函数;
private void update() {
//contains some code borrowed from snake example
long currentTime = System.currentTimeMillis();
if (currentTime - lastUpdateTime >= delay) {
if (!gamePaused) {
gamePanel.invalidate();
lastUpdateTime = currentTime;
}
}
refreshHandler.sleep(delay);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//remove the title
requestWindowFeature(Window.FEATURE_NO_TITLE);
//fullscreen
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
//Set top and left boundaries; ball tends to get stuck on these
//set up the application context for toast notifications
context = getApplicationContext();
gamePanel = new GameView(this);
drawColor.setColor(Color.GREEN);
up=true;
setContentView(gamePanel);
lastUpdateTime = System.currentTimeMillis();
update();
}