Android: How do I stop Runnable?

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.

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);                
        }
    }
};

mHandler.removeCallbacks(updateThread);

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