用于互联网连接状态更改的 Android 事件 [英] Android event for internet connectivity state change

问题描述

我正在制作一个应用程序，其中用户经常将信息和文件上传到我的服务器.这是通过专用的上传服务在新线程中完成的.

I am making an app where a user is uploading information and files to my server on a somewhat frequent basis. This is done in new threads through a dedicated uploader service.

我从这个帖子中知道

检测Android上是否有可用的互联网连接

您可以相对轻松地检查是否有互联网连接.您还可以获取 socketTimeoutExceptions 以检测 Internet 连接问题.所有这些都很好，当连接因任何原因无法正常工作时，让我可以轻松地缓存我的上传.

that you can check if there is an internet connection relatively easily. You can also get socketTimeoutExceptions to detect internet connectivity issues. All that is well and good, and lets me cache my uploads easily enough when the connection didn't work for whatever reason.

我的问题是我怎么知道什么时候重新尝试上传?连接恢复时是否触发了事件?或者我是否坚持制作一个新线程，然后每 30 秒检查一次互联网连接?

My question though is how do I know when to reattempt the upload? Is there an event triggered when the connection is restored? Or am I stuck making a new thread that sleeps and then checks internet connectivity every 30 seconds or something?

任何想法将不胜感激！

推荐答案

很老的帖子但我想分享我的接收器

very old post but i would like to share my receiver

无需将您的手放在清单或其他无聊的资源上:)

no need to put your hands on manifest or other boring resources :)

/*
 * You need to implement NetworkStateReceiverListener.
 * This interface is described inside the NewtworkStateReceiver class
 */
public class MyActivity implements NetworkStateReceiverListener {
    /* ... */
    private NetworkStateReceiver networkStateReceiver;
}

在您的活动中:实例化接收器

public void onCreate(Bundle savedInstanceState) {
    /* ... */
    networkStateReceiver = new NetworkStateReceiver();
    networkStateReceiver.addListener(this);
    this.registerReceiver(networkStateReceiver, new IntentFilter(android.net.ConnectivityManager.CONNECTIVITY_ACTION));
}

public void onDestroy() {
    super.onDestroy();
    networkStateReceiver.removeListener(this);
    this.unregisterReceiver(networkStateReceiver);
}

在您的活动中:实施所需的方法

@Override
public void networkAvailable() {
    Log.d("tommydevall", "I'm in, baby!");
    /* TODO: Your connection-oriented stuff here */
}

@Override
public void networkUnavailable() {
    Log.d("tommydevall", "I'm dancing with myself");
    /* TODO: Your disconnection-oriented stuff here */        
}

接收器

只需将 NetworkStateReceiver.java 复制并粘贴到您的项目中

public class NetworkStateReceiver extends BroadcastReceiver {

    protected Set<NetworkStateReceiverListener> listeners;
    protected Boolean connected;

    public NetworkStateReceiver() {
        listeners = new HashSet<NetworkStateReceiverListener>();
        connected = null;
    }

    public void onReceive(Context context, Intent intent) {
        if(intent == null || intent.getExtras() == null)
            return;

        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo ni = manager.getActiveNetworkInfo();

        if(ni != null && ni.getState() == NetworkInfo.State.CONNECTED) {
            connected = true;
        } else if(intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY,Boolean.FALSE)) {
            connected = false;
        }

        notifyStateToAll();
    }

    private void notifyStateToAll() {
        for(NetworkStateReceiverListener listener : listeners)
            notifyState(listener);
    }

    private void notifyState(NetworkStateReceiverListener listener) {
        if(connected == null || listener == null)
            return;

        if(connected == true)
            listener.networkAvailable();
        else
            listener.networkUnavailable();
    }

    public void addListener(NetworkStateReceiverListener l) {
        listeners.add(l);
        notifyState(l);
    }

    public void removeListener(NetworkStateReceiverListener l) {
        listeners.remove(l);
    }

    public interface NetworkStateReceiverListener {
        public void networkAvailable();
        public void networkUnavailable();
    }
}

享受;)

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