Android 实时监测网络，网络变化监听 适配7.0方案

【友情链接】 https://www.jianshu.com/p/89e3fbd33964
【总结】android 7.0之后必须动态注册 网络监听。

 **
 * 网络状态监听
 *
 * @author lee
 * @date 2018/11/29
  */

public class NetworkReceiver extends BroadcastReceiver {

private NetworkCallback networkCallback;
private ConnectivityManager.NetworkCallback callback;

public NetworkReceiver(Activity activity, NetworkCallback networkCallback) {
    this.networkCallback = networkCallback;

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        ConnectivityManager connManager = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);

        callback = new ConnectivityManager.NetworkCallback() {

            @Override
            public void onAvailable(Network network) {
                super.onAvailable(network);
                networkCallback.onAvailable();
            }

            @Override
            public void onLost(Network network) {
                super.onLost(network);
                networkCallback.onLost();
            }
        };
        connManager.registerDefaultNetworkCallback(callback);
    } else {
        IntentFilter intentFilter = new IntentFilter();
        //intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
        //intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
        intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);

        activity.registerReceiver(this, intentFilter);
    }
}

@Override
public void onReceive(Context context, Intent intent) {
    if (intent.getAction() == ConnectivityManager.CONNECTIVITY_ACTION) {
        NetworkInfo networkInfo = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
        if (NetworkUtils.isConnected()) {
            this.networkCallback.onAvailable();
        } else {
            this.networkCallback.onLost();
        }
    }
}

/**
 * 取消网络监听
 *
 * @param activity
 */
public void unRegister(Activity activity) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        ConnectivityManager connManager = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);

        connManager.unregisterNetworkCallback(callback);
    } else {
        activity.unregisterReceiver(this);
    }
}

/**
 * 网络状态回调
 */
public interface NetworkCallback {

    /**
     * 网络可用
     */
    void onAvailable();

    /**
     * 网络不可用，丢失连接
     */
    void onLost();

     }

  }