在Xamarin Android中播放铃声一分钟

Question

我的警报项目几乎完成了，我有代码每秒比较当前时间和目标时间，看看是否为真，并在警报成熟时播放铃声。我的问题是，我似乎无法在指定的时间段内播放铃声，然后停止这是我的源文件。。。

class SecondActivity : AppCompatActivity{
//System Timer defintion with interval of one second in class
System.Timers.Timer _stopringtone = new System.Timers.Timer(1000);
protected override void OnCreate(Bundle savedInstanceState){
//Defining path for Ringtone's default uri
path = RingtoneManager.GetDefaultUri(RingtoneType.Ringtone);
//Ringtone instance
r = RingtoneManager.GetRingtone(Application.Context, path);
//Timer elpase event handler 
_stopringtone.Elapsed += _stopringtone_Elapsed;
//Timer disabled by default will be enabled by alarm maturity event
_stopringtone.Enabled = false;

}
//This event checks every second if the two time variables are equal and plays a ringtone alongside a vibration pattern 
private void OnTimedEvent(object sender, System.Timers.ElapsedEventArgs e)
{
RunOnUiThread(() =>
{
//Code to check current time and target time defined here


//Logic to compare the two variables
if (span == span1){
//Event Elapse method returns true so alarm time has matured, play some music and vibration

//Vibration definition
Vibrator vibrator = (Vibrator)GetSystemService(Context.VibratorService);
//Vibration pattern definition
long[] pattern = { 0, 2000, 2000 };
//Play vibration
vibrator.Vibrate(pattern,0);
//Play Ringtone Uri,This is where I need code to play the ringtone for interval 60 seconds
r.Play();
//Alarm matured so enable timer to count down 20 seconds and shut off music
_stopringtone.Enabled = true;
}
}
//CountDown Logic method
private void _stopringtone_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
RunOnUiThread(() =>
{
int a = 0;
int b = a++;
if (b == 10)
{
r.Stop();
}
});
}
}

铃声永远播放，我需要一些代码来检查和管理播放时间，谢谢。它现在工作。。。

Answer 1

您可以使用TimerTask和Timer来安排一段指定的时间来做某事。

例如，每秒创建一个TimerTask以计数并停止计时器任务直到60秒。

class MyTask : TimerTask
{
Timer mTimer;
Ringtone ringtone;
MainActivity mainActivity;
public MyTask(Timer timer, Ringtone r, MainActivity mainActivity)
{
this.mTimer = timer;
this.ringtone = r;
this.mainActivity = mainActivity;
}
int i;
public override void Run()
{
if (i < 60)
{
i++;
}
else
{
mTimer.Cancel();
ringtone.Stop();
mainActivity.StartActivity(typeof(NextActivity));
}

}
}

然后在Activity.cs中，我们可以调用方法中的Ringtone.Play()，例如单击按钮的方法：

private void Button_Click(object sender, EventArgs e)
{
Timer timer = new Timer();
timer.Schedule(new MyTask(timer,r,this), 0, 1000);
r.Play();
}