监听网络状态变化

public class NetStateReceiver extends BroadcastReceiver {
    private static final String TAG = NetStateEvent.class.getSimpleName();
    @Override
    public void onReceive(Context context, Intent intent) {
        NetStateEvent stateEvent;
        if (NetWorkUtils.isNetworkAvailable(context)) {
            stateEvent = new NetStateEvent(true);
        } else {
            stateEvent = new NetStateEvent(false);
        }
        EventBus.getDefault().post(stateEvent);
    }
}

<receiver android:name="com.example.NetStateReceiver" >
           <intent-filter>
               <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
           </intent-filter>
</receiver>