Question

我已经设置了ListView。每个ListView-Items都包含一个ToggleButton，它启动或停止服务中的线程。

只要激活toggleButtons，线程就需要运行。如果活动停止，则服务和激活的线程需要继续。

//In MainActivity
@Override
public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {
Intent intent = new Intent(context,MyService.class);
intent.putExtra("id",listviewPosition);
startService(intent);
}


//MyService
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // Thread(startId) starten
    HandlerThread thread = new HandlerThread(String.valueOf(startId));
    thread.start();
    // Threads looper holen und beim servicehandler benutzen
    serviceHandler = new ServiceHandler(thread.getLooper());
    listServericeHandler.add(serviceHandler);
    //message ausm pool holen
    Message msg = serviceHandler.obtainMessage();
    msg.arg1 = startId;
    serviceHandler.sendMessage(msg);
    return START_STICKY;
}

private final class ServiceHandler extends Handler {
public ServiceHandler(Looper looper) {
    super(looper);
    }

@Override
public void handleMessage(Message msg) {
while (continueUntilToggleButtonIsDeactivated) {
Log.d(MainActivity.TAG, "Thread " + tring.valueOf(msg.arg1)
                + " running: " + url.toExternalForm());
synchronized (this) {
        try {
            //do stuff
            wait(1000);
        } catch (Exception e) {
        }
        }
    }
}
}

所以，每次激活toggleButton时，我都会尝试在OnStartCommand()中启动一个帖子。

我不知道的是如何停止线程并使其脱离while循环。

Answer 1

您只需要为while循环创建一个标志，以便知道何时停止。例如：

private final class ServiceHandler extends Handler {
    private volatile boolean _continueRunning = true;

    public ServiceHandler(Looper looper) {
        super(looper);
    }

    public void stopRunning() {
        _continueRunning = false;
        this.notify(); //Interrupts the wait
    }

    @Override
    public void handleMessage(Message msg) {
        while (_continueRunning) { //Watches the variable
            Log.d(MainActivity.TAG, "Thread " + tring.valueOf(msg.arg1)
                                + " running: " + url.toExternalForm());

        synchronized (this) {
            try {
                //do stuff
                wait(1000);
            } catch (Exception e) {}
        }
    }
}

修改

您应该在服务的onCreate()方法中创建处理程序。 onStartCommand方法会通知您新消息。

//In your Service Class ... private ServiceHandler _serviceHandler; @Override public void onCreate() { HandlerThread thread = new HandlerThread("ServiceClassName"); thread.start(); // Threads looper holen und beim servicehandler benutzen serviceHandler = new ServiceHandler(thread.getLooper()); } @Override public int onStartCommand(Intent intent, int flags, int startId) { //message ausm pool holen Message msg = _serviceHandler.obtainMessage(); msg.arg1 = startId; serviceHandler.sendMessage(msg); return START_STICKY; } private class mRunnable implements Runnable { private volatile boolean _continueRunning = true; @Override public void run() { while (_continueRunning) { //Watches the variable synchronized (this) { try { //do stuff wait(1000); } catch (Exception e) { //Purposefully left blank } } } } public void stopRunning() { _continueRunning = false; this.notify(); } }

然后将ServiceHandler更改为

private final class ServiceHandler extends Handler { //TODO whatever type of list you need private List<mRunnable> _runningThreads = new LinkedList<mRunnable>(); public ServiceHandler(Looper looper) { super(looper); } @Override public void handleMessage(Message msg) { mRunnable runnable = new mRunnable(); new Thread(runnable).start(); } }

具有多个线程的Android服务

1 个答案: