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.