Android如何实时监听网络状态.

前言: 

通过广播接收器实现.

1.自定义一个广播接收器 继承自:BroadcastReceiver

2.代码(重写onReceiver方法):

@Override
public void onReceive(Context context, Intent intent) {
    //API小于23
    if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) {
        ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(
                Context.CONNECTIVITY_SERVICE);

        NetworkInfo wifiNetworkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        NetworkInfo dataNetworkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        if (wifiNetworkInfo.isConnected() || dataNetworkInfo.isConnected()) {
            evevt.onNetChange(1);
        } else {
            evevt.onNetChange(0);
        }
    } else {//API大于23时
        System.out.println("API level 大于23");
        //获得ConnectivityManager对象
        ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(
                Context.CONNECTIVITY_SERVICE);

        Network[] networks = connMgr.getAllNetworks();
        StringBuilder sb = new StringBuilder();
        //通过循环将网络信息逐个取出来
        for (int i = 0; i < networks.length; i++) {
            //获取ConnectivityManager对象对应的NetworkInfo对象
            NetworkInfo networkInfo = connMgr.getNetworkInfo(networks[i]);
            if (networkInfo.isConnected()){
                evevt.onNetChange(1);
            }else {
                evevt.onNetChange(0);
            }
        }
    }

3.添加权限  与 动态注册.

4.通过接口回调将状态值返回去,执行相应逻辑处理.