[android-developers] Stop all the threads in ExecutorService

Hello. I have to stop all the threads from an ExecutorService object. I used the example from http://developer.android.com/reference/java/util/concurrent/ExecutorService.html#awaitTermination(long, java.util.concurrent.TimeUnit)

and only 1 out if 15 threads was terminated. Why? 

Is it a better idea to solve my task such a way?

    public void stopInteraction() {

        Log.i(Constants.LOG_TAG, "Stop threads: ServerInteraction::stopInteraction()");

        isCancelling = true;

        mPoolThreads.shutdown(); // Disable new tasks from being submitted

        boolean isTerminated = mPoolThreads.isTerminated();

        while (!isTerminated) {

            mPoolThreads.shutdownNow();

            isTerminated = mPoolThreads.isTerminated();

            Log.i(Constants.LOG_TAG, "Stop threads: the threads are not terminated yet");

        }

        Log.w(Constants.LOG_TAG, "Stop threads: Terminated");

        if (mLoadHandler != null) {

            mLoadHandler.onDataLoadCancelled();

        }

        if (mSendHandler != null) {

            mSendHandler.onDataSendCancelled();

        }

    }

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