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):

@Overridepublic 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.

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