Question

我正在使用此Android类来实现倒计时：http://developer.android.com/reference/android/os/CountDownTimer.html

我创建了一个自己的类My Count：

public class MyCount extends CountDownTimer{

public MyCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}

@Override
public void onFinish() {
tv_test.setText("");
}

@Override
public void onTick(long millisUntilFinished) {
tv_test.setText("d"+ (millisUntilFinished/(3600000*24))+ " h: "+  (millisUntilFinished/3600000)%24  +" m: " +  (millisUntilFinished/60000) % 60 + " sec: "+   (millisUntilFinished/1000) % 60);

}

}

在我的活动的onStart（）中我有这段代码：

MyCount counter = new MyCount(time, 1000);
        counter.start();

现在的问题是：如果我导航到下一个活动并返回，则会再次启动倒数计时器并进行两次倒计时。

我无法将其放在onCreate（）中，因为用户可以更改时间变量。他在另一项活动中改变了它

Answer 1

尝试添加布尔值例如：

booelan counterIsLaunched = false;
boolean timeChanged = false;

并在您的计数器实现中添加：

@Override
public void onFinish() { tv_test.setText("");
counterIsLaunched = false;
if(timeChanged) start();
}
@Override
public void onTick(long millisUntilFinished) {
tv_test.setText("d"+ (millisUntilFinished/(3600000*24))+ " h: "+  (millisUntilFinished/3600000)%24  +" m: " +  (millisUntilFinished/60000) % 60 + " sec: "+   (millisUntilFinished/1000) % 60);
counterIsLaunched = true;
if(timeChanged) start();
}

并在你的onStart（）中尝试测试变量

if(counter.getCounterIsLaunched() == false ) {
counter.start();
}

当您更改计时器时，请执行以下操作：

counter.getTimeChanged() = true;

希望它有助于男人：）

倒数计时器问题

1 个答案: