Android(安卓)监测手机联网状态 wifi、移动数据流量、无联网状态

手机当完成联网时会发送一个广播，我们只要创建一个广播接收者即可，代码如下：

package com.example.NetworkChangeReceiver2;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.widget.Toast;/** * Created by Heyiyong on 2014-4-20 下午2:23. */public class NetworkChangeReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo activeNetworkInfo = cm.getActiveNetworkInfo();        if (activeNetworkInfo == null) {            Toast.makeText(MyActivity.instance, "当前无网络连接！", 1).show();        }        if (activeNetworkInfo.getType() == ConnectivityManager.TYPE_WIFI) {            Toast.makeText(MyActivity.instance, "wifi连接成功！", 1).show();            return;        }        if (activeNetworkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {//当前的connect不是wifi，并且是移动数据            Toast.makeText(MyActivity.instance, "移动数据流量连接！", 1).show();            return;        }    }}

MyActivity.java

package com.example.NetworkChangeReceiver2;import android.app.Activity;import android.os.Bundle;public class MyActivity extends Activity {    public static MyActivity instance;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        instance = this;    }}

注意：不要忘了添加权限：

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

注册广播接收者：

        <receiver                android:name=".NetworkChangeReceiver"                android:label="NetworkConnection" >            <intent-filter>                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />            </intent-filter>        </receiver>

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