Android: How do I stop Runnable?

问题

I tried this way:

private Runnable changeColor = new Runnable() {
   private boolean killMe=false;
   public void run() {
       //some work
       if(!killMe) color_changer.postDelayed(changeColor, 150);
   }
   public void kill(){
       killMe=true;
   }
};

but I can\'t access kill() method!

回答1:

Instead implement your own thread.kill() mechanism, using existing API provided by the SDK. Manage your thread creation within a threadpool, and use Future.cancel() to kill the running thread:

ExecutorService executorService = Executors.newSingleThreadExecutor();
Runnable longRunningTask = new Runnable();

// submit task to threadpool:
Future longRunningTaskFuture = executorService.submit(longRunningTask);

... ...
// At some point in the future, if you want to kill the task:
longRunningTaskFuture.cancel(true);
... ...

Cancel method will behave differently based on your task running state, check the API for more details.

回答2:

public abstract class StoppableRunnable implements Runnable {

    private volatile boolean mIsStopped = false;

    public abstract void stoppableRun();

    public void run() {
        setStopped(false);
        while(!mIsStopped) {
            stoppableRun();
            stop();
        }
    }

    public boolean isStopped() {
        return mIsStopped;
    }

    private void setStopped(boolean isStop) {    
        if (mIsStopped != isStop)
            mIsStopped = isStop;
    }

    public void stop() {
        setStopped(true);
    }
}

class ......

    private Handler mHandler = new Handler();

public void onStopThread() {
    mTask.stop();       
    mHandler.removeCallbacks(mTask);
}

public void onStartThread(long delayMillis) {
    mHandler.postDelayed(mTask, delayMillis);
}

private StoppableRunnable mTask = new StoppableRunnable() {
    public void stoppableRun() {        
                    .....
            onStartThread(1000);                
        }
    }
};

回答3:

mHandler.removeCallbacks(updateThread);

回答4:

changeColor is declared as Runnable, which does not have a kill() method.

You need to create your own interface that extends Runnable and adds a (public) kill() method.

回答5:

You can Use this way

Stop Runnable Thread //==============================================================================

 ThreadUtil.startTask(() -> {
                        // doTask
                    }, 1500);


//==============================================================================
 public class ThreadUtil {

        private static Handler handler;
        private static Runnable runnable;

        public static void startTask(IThreadTask iThreadTask, long delayTime) {
            stopTask();
            handler = new Handler();
            runnable = () -> {
                iThreadTask.doTask();
            };

            if (handler == null || runnable == null) {
                return;
            }

            handler.postDelayed(runnable, delayTime);

        }

        public static void stopTask() {
            try {
                handler.removeCallbacks(runnable);
                handler.removeCallbacksAndMessages(null);
                handler = null;
                runnable = null;

            }catch (Exception e){
                Log.e("ThreadUtil:","Error:"+e.toString());

            }

        }


        public interface IThreadTask {
            void doTask();
        }


    }

来源：https://stackoverflow.com/questions/9458097/android-how-do-i-stop-runnable