Android实时监听网络状态

我们在Android应用开发中有时必须实时监听这个程序的实时网络状态，还好Android在网络断开与连接时都会发送系统广播，我们通过接收系统的广播就可以实现网络的实时监听。

1.定义一个名为MyBroadcastReceiver的广播接收器并且实现BroadcastReceiver，重载 onReceive（）函数，并在里面对网络状态进行判断：

package com.broadcast;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.net.ConnectivityManager;import android.net.NetworkInfo;public class MyBroadcastReceiver extends BroadcastReceiver {private SharedPreferences shared = null;private int flag = -1;@Overridepublic void onReceive(Context context, Intent intent) {// 获得网络连接服务ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);// 判断是否正在使用GPRS网络NetworkInfo mobileNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);// 判断是否正在使用WIFI网络NetworkInfo wifiNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);if (!mobileNetInfo.isConnected() && !wifiNetInfo.isConnected()) {flag = 0;} else {flag = 1;}System.out.println("--当前网络状态--flag--:" + flag);shared = context.getSharedPreferences("UserInfo", 0);Editor editor = shared.edit();editor.putInt("network", flag);editor.commit();}}

2.在合适的地方注册MyBroadcastReceiver，在onCreate（）中调用如下函数进行广播的注册（动态注册）：

/** * 注册广播 */private void registerReceiver() {// 注册广播接收器IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);MyBroadcastReceiver receiver = new MyBroadcastReceiver();registerReceiver(receiver, filter);}

3.记得加权限

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

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