如何在Android应用程序中优雅地关闭所有活动并关闭所有正在运行的线程?

目前,在我的每一项活动中,我都有这样的方法:

private void registerReceiverClose(){
    Activity activity = this;
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction("CLOSE_ALL");
    broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            activity.finish();
        }
    };
    registerReceiver(broadcastReceiver, intentFilter);
}

还有这个:

@Override
protected void onDestroy() {
    unregisterReceiver(broadcastReceiver);
    super.onDestroy();
}

它们由以下注销按钮触发:

    Button logout = findViewById(R.id.logout_button);
    logout.setOnClickListener(click -> {
        Intent intent = new Intent("CLOSE_ALL");
        this.sendBroadcast(intent);
    });

有一件事我肯定不是以正确的方式结束的,那就是我有这样的代码:

private static final ScheduledExecutorService pollingScheduledExecutor = Executors.newSingleThreadScheduledExecutor();

private static final Object lock = new Object();
private static ScheduledFuture<?> currentRunningTask;

public void longPoll() {
    synchronized (lock) {
        if (currentRunningTask != null) {
            currentRunningTask.cancel(true);
        }
        try {
            currentRunningTask = pollingScheduledExecutor.scheduleAtFixedRate(this, 0, 3, TimeUnit.SECONDS);
        } catch (Exception ignored) {
        }
    }
}

public void request() {
    Thread requestThread = new Thread(this);
    requestThread.start();
}

即使在我死后也会继续发出请求 认为 我应该注销,这会导致服务器出错。