静态注册广播监听网络变化

常用的IM聊天App中都会判断网络连接是否可用，今天我们就用静态注册注册广播来监听网络的变化：首先申请网络权限

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

然后在mainifest文件静态注册广播：
<receiver
android:name=".NetWorkChangeReceiver"
android:enabled="true"
android:exported="true">
<intent-filter android:priority="1000">
<action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
</intent-filter>
</receiver>

这样当网络变化的时候，就能监听到相应的网络情况：
package com.example.administrator.broadcastreceiver;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.widget.Toast;

public class NetWorkChangeReceiver extends BroadcastReceiver {
public NetWorkChangeReceiver() {
}

@Override
public void onReceive(Context context, Intent intent) {
// TODO: This method is called when the BroadcastReceiver is receiving
//Toast.makeText(context,"netChanged!",Toast.LENGTH_LONG).show();
ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if(networkInfo !=null && networkInfo.isAvailable())
{
Toast.makeText(context,"isAvailable!",Toast.LENGTH_LONG).show();
}else
{
Toast.makeText(context,"unAvailable!",Toast.LENGTH_LONG).show();
}
}
}
OK了，静注册广播监听网络变化已实现。