Android 判断当前联网的类型 wifi、移动数据流量

先获取系统管理网络连接的Manager：

ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

再获取当前已经激活的连接：（当期为null时代表当前无连接）

NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();

其中常量ConnectivityManager.TYPE_MOBILE标识着是移动数据流量，

而ConnectivityManager.TYPE_WIFI标志着是wifi。

package com.example.NetworkChangeReceiver2;



import android.app.Activity;

import android.content.Context;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

import android.os.Bundle;

import android.view.View;

import android.widget.Toast;



public class MyActivity extends Activity {



    ConnectivityManager connectivityManager;



    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);



        connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    }



    public void isWifi(View view) {

        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();

        if (activeNetworkInfo == null) {

            Toast.makeText(this, "没有联网！", 1).show();

            return;

        }

        if(activeNetworkInfo.getType() == ConnectivityManager.TYPE_WIFI) {

            Toast.makeText(this, "连接的网络是wifi！", 1).show();

        } else {

            Toast.makeText(this, "不是wifi！", 1).show();

        }

    }



    public void isMobile(View view) {

        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();

        if (activeNetworkInfo == null) {

            Toast.makeText(this, "没有联网！", 1).show();

            return;

        }

        if(activeNetworkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {

            Toast.makeText(this, "连接的网络是移动数据流量！", 1).show();

        } else {

            Toast.makeText(this, "不是移动数据流量！", 1).show();

        }

    }

}