Android解决网络连接广播接收到多次的问题

我们知道,监听网络是否连接,是需要用广播的,如下操作:

IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
mReceiver = new NetWorkReceiver();
registerReceiver(mReceiver, filter);

当网络发生变化后,就会收到广播,然后判断网络是否连接,如下:

NetworkInfo networkInfo = getSystemService(Context.CONNECTIVITY_SERVICE).getActiveNetworkInfo();
if (networkInfo != null && networkInfo.getState() == NetworkInfo.State.CONNECTED) {
    //网络已连接
}

然而,仅仅是已连接的状态,系统就会发出多次广播,这时如果我们做一些操作,很可能会重复,所以需要做一些去重操作,如下:

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;

public class NetChanageReceiver extends BroadcastReceiver {
    private String TAG = NetChanageReceiver.class.getSimpleName();
    private NetworkInfo lastConnectedNetwork;
    @Override
    public void onReceive(Context context, Intent intent) {
        networkStateChange(context);
    }
    public void networkStateChange(Context context) {
        NetworkInfo networkInfo = ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();

        if (networkInfo != null && networkInfo.getState() == NetworkInfo.State.CONNECTED) {
            if (lastConnectedNetwork == null
                    || lastConnectedNetwork.getType() != networkInfo.getType()
                    || !equalsObj(lastConnectedNetwork.getExtraInfo(), networkInfo.getExtraInfo())
            ) {
                Log.d(TAG,"Network is connected");
                
                lastConnectedNetwork = networkInfo;
            }
        } else if (networkInfo == null) {
            // Not connected, stop openvpn, set last connected network to no network
            lastConnectedNetwork = null;
            Log.d(TAG,"Disconnected from the network");
        }
    }

    public static boolean equalsObj(Object a, Object b) {
        return (a == null) ? (b == null) : a.equals(b);
    }
}