我目前正在构建一个在 WiFi 扬声器上播放音乐的应用程序。该应用程序可以连接多个扬声器，每个扬声器播放不同的音乐。
由于经常无法接收扬声器发送到应用程序的歌曲播放进度，我必须为每个正在播放音乐的扬声器运行一个计时器，以便持续跟踪歌曲进度。这样，每次我收到歌曲进度时，我都会更新计时器，然后计时器将从更新的歌曲进度开始计数。
这是运行计时器的代码。
public class SongTimer
{
Timer mTimer;
int count;
long duration;
int groupAddress;
SongTimerListener listener;
boolean timer;
private Handler mHandler = new Handler();
public interface SongTimerListener
{
public void onPositionCounted(int position);
public void onFinishCounting();
}
public SongTimer(int position, long duration, int groupAddress, SongTimerListener listener)
{
this.listener = listener;
this.count = position;
this.duration = duration;
this.groupAddress = groupAddress;
timer = true;
}
public void startTimer()
{
mTimer = new Timer();
mTimer.schedule(new TimerTask()
{
@Override
public void run()
{
if (timer)
{
if(count<=(duration/1000))
{
mHandler.post(new Runnable()
{
public void run(){
if (DataHolder.PlayProgress.containsKey(DataHolder.tSpeaker.mAddress))
{
long progress = DataHolder.PlayProgress.get(DataHolder.tSpeaker.mAddress);
count=(int)progress;
}
}
});
}
else
{
mHandler.post(new Runnable()
{
public void run()
{
count = 0;
}
});
}
}
else
{
mHandler.post(new Runnable()
{
public void run()
{
mTimer.cancel();
mTimer = null;
if(SongTimer.this.listener != null)
{
SongTimer.this.listener.onFinishCounting();
}
}
});
}
count++;
if(SongTimer.this.listener != null)
{
SongTimer.this.listener.onPositionCounted(count);
}
}
}, 1000, 1000);
}
public void stopTimer()
{
timer = false;
DataHolder.PlayProgress.put(this.groupAddress, (long)count);
}
}
用户选择一个扬声器，然后当用户用该扬声器播放音乐时将启动一个计时器。当用户切换到另一个扬声器并用它播放歌曲时，将再次启动新的计时器。所有启动的计时器都将存储在一个 HashMap 中，使用 groupAddress 作为对象计时器的键。
当用户点击暂停时，计时器将从HashMap中获取，然后终止它，但最后计算的位置将被记住。
当用户点击恢复时，时间将再次开始(new Timer())，然后从最后存储的位置开始计数。
问题来了:
当多个计时器开始运行时，它们工作正常。但是当用户点击暂停时，将从 HashMap 中获取一个计时器，然后终止它。但不幸的是所有计时器都同时终止。我检查了日志中计时器的对象ID，它们都是不同的。所以我不明白这里出了什么问题。
请帮忙。非常感谢!
最佳答案
试试这个
public class SongTimer{
int count;
long duration;
int groupAddress;
SongTimerListener listener;
boolean timer,run;
View user; //the view who this is going to be attached to
public interface SongTimerListener {
public void onPositionCounted(int position);
public void onFinishCounting();
}
//your constructor
public SongTimer(int position, long duration, int groupAddress,
SongTimerListener listener, View viewToAttach){ //added new parameter
this.listener = listener;
this.count = position;
this.duration = duration;
this.groupAddress = groupAddress;
timer = run = true;
user = viewToAttach;
new Thread(new Runnable() { // your timer
@Override
public void run() {
while(run){
if(!timer)
continue;
//now add your implementation here, (its too late here)
//put your code that you already have here, but minor changes
//if you need to call a Ui method use the user.post(runnable); it
// the same as handler.post(runnable), also with this you have
// reference to your view to which you want to alter, so all you
// to do is do what you want to do easily without actually needing
// your interface call. and all Views that they rely on the music
//mechanism that you talked about will each have an instance of this
//class. your pausing mechanism has already being implemented so
//maintain your old pausing mechanism. Also if you are done and want
// totally stop the thread or kill this class set the boolean run
//variable to false.
}
}).start();
}
希望对你有帮助
关于java - Android - 如何在后台运行多个计时器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31467745/