网络监听以及判断网络是否可用

<receiver

android:name=".receiver.ConnectionChangeReceiver" >

<intent-filter>

<action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>

</intent-filter>

</receiver>

public class ConnectionChangeReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
if (!Utils.isNetworkConnected()) {
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.cancel(Constants.NOTIFICATION_SYNC);
}
}

}

public static boolean isNetworkConnected() {
ConnectivityManager connectivity = (ConnectivityManager) DoitApplication.mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null) {
// TODO 网络不可用
} else {// 获取所有网络连接信息
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {// 逐一查找状态为已连接的网络
for (int i = 0; i < info.length; i++) {
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return false;
}