先獲取系統(tǒng)管理網(wǎng)絡(luò)連接的Manager：

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

再獲取當前已經(jīng)激活的連接：（當期為null時代表當前無連接）

NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();

其中常量ConnectivityManager.TYPE_MOBILE標識著是移動數(shù)據(jù)流量，

而ConnectivityManager.TYPE_WIFI標志著是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, "沒有聯(lián)網(wǎng)！", 1).show();
            return;
        }
        if(activeNetworkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
            Toast.makeText(this, "連接的網(wǎng)絡(luò)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, "沒有聯(lián)網(wǎng)！", 1).show();
            return;
        }
        if(activeNetworkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
            Toast.makeText(this, "連接的網(wǎng)絡(luò)是移動數(shù)據(jù)流量！", 1).show();
        } else {
            Toast.makeText(this, "不是移動數(shù)據(jù)流量！", 1).show();
        }
    }
}

總結(jié)

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