我正在制作一个应用程序，用户经常将信息和文件上传到我的服务器。这是通过专门的上传服务在新线程中完成的。
我从这个线程知道
检测 Android 上是否有可用的 Internet 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 来检测互联网连接问题。这一切都很好，并且让我可以在连接由于某种原因无法正常工作时轻松缓存我的上传。
我的问题是我怎么知道何时重新尝试上传？连接恢复时是否触发事件？或者我是否坚持创建一个新线程，然后每 30 秒检查一次互联网连接或其他什么？
任何想法，将不胜感激！
很旧的帖子，但我想分享我的接收器
无需将手放在清单或其他无聊的资源上 :)
/*
* You need to implement NetworkStateReceiverListener.
* This interface is described inside the NewtworkStateReceiver class
*/
public class MyActivity implements NetworkStateReceiverListener {
/* ... */
private NetworkStateReceiver networkStateReceiver;
}
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);
}
@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 */
}
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();
}
}
请享用 ;）
如果您只想在连接发生变化时做一些简单的事情，那么有一个更简单的解决方案。
在您的活动中，创建一个广播接收器：
private BroadcastReceiver networkStateReceiver=new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = manager.getActiveNetworkInfo();
doSomethingOnNetworkChange(ni);
}
};
然后进入onResume并onPause进行注册：
@Override
public void onResume() {
super.onResume();
registerReceiver(networkStateReceiver, new IntentFilter(android.net.ConnectivityManager.CONNECTIVITY_ACTION));
}
@Override
public void onPause() {
unregisterReceiver(networkStateReceiver);
super.onPause();
}
不太确定 Tommaso 的广播接收器发生了什么，但它对我不起作用，这是我的实现。它只通知连接可用/不可用之间的变化。
我也将其注册onResume()并取消注册onPause()。否则同上。
public class NetworkStateReceiver extends BroadcastReceiver {
private ConnectivityManager mManager;
private List<NetworkStateReceiverListener> mListeners;
private boolean mConnected;
public NetworkStateReceiver(Context context) {
mListeners = new ArrayList<NetworkStateReceiverListener>();
mManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
checkStateChanged();
}
public void onReceive(Context context, Intent intent) {
if (intent == null || intent.getExtras() == null)
return;
if (checkStateChanged()) notifyStateToAll();
}
private boolean checkStateChanged() {
boolean prev = mConnected;
NetworkInfo activeNetwork = mManager.getActiveNetworkInfo();
mConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();
return prev != mConnected;
}
private void notifyStateToAll() {
for (NetworkStateReceiverListener listener : mListeners) {
notifyState(listener);
}
}
private void notifyState(NetworkStateReceiverListener listener) {
if (listener != null) {
if (mConnected) listener.onNetworkAvailable();
else listener.onNetworkUnavailable();
}
}
public void addListener(NetworkStateReceiverListener l) {
mListeners.add(l);
notifyState(l);
}
public void removeListener(NetworkStateReceiverListener l) {
mListeners.remove(l);
}
public interface NetworkStateReceiverListener {
public void onNetworkAvailable();
public void onNetworkUnavailable();
}
}
对 @darnmason 答案（构造函数）进行了更改，使其适用于API 24+。
public NetworkStateReceiver(Context context) {
mListeners = new ArrayList<>();
mManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
context.registerReceiver(NetworkStateReceiver.this, intentFilter);
checkStateChanged();
}