网络状态判断

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetUtils {
    //网络状态判断工具类
    public static int isNetworkConnected(Context context) {
        int NetWork = -1;
        //判断上下文是否为空
        if (context != null) {
            //获取网络状态
            ConnectivityManager manager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = manager.getActiveNetworkInfo();
            //无网络
            if (mNetworkInfo == null) {
                NetWork = -1;
                //WiFi
            } else if (manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI) != null) {
                NetWork = 1;
                //移动
            } else if (manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE) != null) {
                NetWork = 2;
            }
        }
        return NetWork;
    }
}

main：

//判断网络连接状态并吐丝
private void NetWork() {
    int connected = NetUtils.isNetworkConnected(MainActivity.this);
    if (connected == -1) {
        Toast.makeText(this, "没有网络", Toast.LENGTH_SHORT).show();
    } else if (connected == 1) {
        Toast.makeText(this, "wifi在线", Toast.LENGTH_SHORT).show();
    } else if (connected == 2) {
        Toast.makeText(this, "移动在线", Toast.LENGTH_SHORT).show();
    }
}