自动刷新活动中的JMDNS服务

Question

我正在尝试在背景中自动刷新JMDNS服务。当我尝试时，没有什么发生的：

@Override
public void onDestroy() {
    try {
        hiNeighborService.unregisterListener(this);
        this.unbindService(this.serviceConnection);

    } catch (Exception ex) {
        Log.e(LOG_TAG, "Exception occur during destroying the app.");
    }

    super.onDestroy();
}

@Override
public void onStart() {
    /*new Thread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            try {
                refreshServices();
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } 

    }).start();*/

    ScheduledExecutorService scheduleTaskExecutor = Executors.newScheduledThreadPool(5);

    // This schedule a runnable task every 2 minutes
    scheduleTaskExecutor.scheduleAtFixedRate(new Runnable() {
      public void run() {
        rebindService();
        refreshServices();
      }
    }, 0, 1, TimeUnit.SECONDS);


    super.onStart();
}

@Override
public void onRestart() {
    /*new Thread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            try {
                refreshServices();
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } 

    }).start();*/
    ScheduledExecutorService scheduleTaskExecutor = Executors.newScheduledThreadPool(5);

    // This schedule a runnable task every 2 minutes
    scheduleTaskExecutor.scheduleAtFixedRate(new Runnable() {
      public void run() {
        rebindService();
        refreshServices();
      }
    }, 0, 1, TimeUnit.SECONDS);

    super.onRestart();
}

@Override
public void onResume() {
    /*new Thread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            try {
                refreshServices();
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } 

    }).start();*/

    ScheduledExecutorService scheduleTaskExecutor = Executors.newScheduledThreadPool(5);

    // This schedule a runnable task every 2 minutes
    scheduleTaskExecutor.scheduleAtFixedRate(new Runnable() {
      public void run() {
        rebindService();
        refreshServices();
      }
    }, 0, 1, TimeUnit.SECONDS);

    super.onResume();
}

.

这是我的resfreshservices（）方法：

private void refreshServices() {
    Log.i(LOG_TAG, "Refresh available neighbors...");
    final List<Neighbor> activeNeighbors = this.hiNeighborService
            .getActiveNeighbors();
    Log.d(LOG_TAG, activeNeighbors.size() + " active neighbors are found!");

    new Thread(new Runnable() {
        public void run() {
            Log.i(LOG_TAG, "refresh UI...");
            try {

                synchronized (activeNeighborsViewModel) {
                    activeNeighborsViewModel.clear();
                    for (Neighbor neighbor : activeNeighbors) {
                        NeighborViewModel vm = new NeighborViewModel(
                                neighbor);
                        vm.setNeighborUnreadCount(ConnectActivity.this
                                .getUnreadMessageCount(neighbor));
                        if (activeNeighborsViewModel.contains(vm)) {
                            activeNeighborsViewModel.remove(vm);
                        }

                        activeNeighborsViewModel.add(vm);
                    }
                }
                notifyServiceListChanged();

                Log.i(LOG_TAG, "refresh completed!");
            } catch (Exception ex) {
                ex.printStackTrace();
                Log.e(LOG_TAG, ex.toString());
            }
        }
    }).start();
}

.

通常在单击按钮时呼叫，但是我希望它是自动的。除非我点击调用ResFreshServices（）的Resfresh按钮，否则此代码不执行任何操作。我试图用线程尝试，但活动结束，应用程序也是如此。任何想法？

Answer 1

对您的代码有点评论。为什么您以三种不同的方法在三次实现相同的代码。我假设您正在编程Android（以您的方法名称欣赏）。每次开始或恢复活动时执行onresume的方法。请参阅此链接有关此主题的更多信息。 好的，然后......你已经检查了关于 scheduledexecutorservice ？

现在为jmdns问题。 JMDNS库具有符合功能以更新服务的构建。您可以倾听新服务，并在新服务提供时采取适当的行动。我不认为，反复投票的服务是正确的方法。

look 在此处在Android中使用jmdns的一点教程。