【小结备用】Android监听网络状态实现(BroadcastReceiver + Service)

【总结备用】Android监听网络状态实现(BroadcastReceiver + Service)Android网络应用程序开发中，经常要判断

【总结备用】Android监听网络状态实现(BroadcastReceiver + Service)
Android网络应用程序开发中，经常要判断网络连接是否可用，因此经常有必要监听网络状态的变化。

Android的网络状态监听可以用BroadcastReceiver来接收网络状态改变的广播，具体实现如下：

/**?
?*?ConnectionChangeReceiver?
?*??
?*?@author?benny?Yang?on?2011-12-23?
?*?
?*/??
public?class?ConnectionChangeReceiver?extends?BroadcastReceiver?{??
??
????private?static?final?String?TAG?=ConnectionChangeReceiver.class.getSimpleName();??
??????
????@Override???
????public?void?onReceive(Context?context,?Intent?intent)?{???
????Log.e(TAG,?"网络状态改变");???
??
????boolean?success?=?false;???
??
????//获得网络连接服务???
????ConnectivityManager?connManager?=?(ConnectivityManager)?context.getSystemService(Context.CONNECTIVITY_SERVICE);???
????//?State?state?=?connManager.getActiveNetworkInfo().getState();???
????//?获取WIFI网络连接状态??
????State?state?=?connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();???
????//?判断是否正在使用WIFI网络???
????if?(State.CONNECTED?==?state)?{??
????success?=?true;???
????}???
????//?获取GPRS网络连接状态???
????state?=?connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();??
????//?判断是否正在使用GPRS网络???
????if?(State.CONNECTED?!=?state)?{???
????success?=?true;???
????}???
??
????if?(!success)?{???
????Toast.makeText(context,?context.getString(R.string.your_network_has_disconnected),?Toast.LENGTH_LONG).show();???
????}????
????}??

记得在Manifest文件里面进行权限声明，和广播接收器注册。

<?!--?Needed?to?check?when?the?network?connection?changes?-->? ?
<?uses-permission?android:name="android.permission.ACCESS_NETWORK_STATE"/>? ?
<?receiver?android:name="you_package_name.ConnectionChangeReceiver"? ?android:label="NetworkConnection">? ?
<?intent-filter>? ?
? ? ? <?action?android:name="android.net.conn.CONNECTIVITY_CHANGE"/>? ?
<?/intent-filter>? ?
<?/receiver>?

使用方式一：

1. 在Activity的onCreate中:
//注册网络监听?
IntentFilter filter = new IntentFilter();??
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);?
registerReceiver(mNetworkStateReceiver, filter);?
2. 在Activity中的onDestroy中:
//取消监听
unregisterReceiver(mNetworkStateReceiver);?

使用方式二：

1. 应用启动时，启动Service，在Service的onCreate方法中注册网络监听：

//注册网络监听?
IntentFilter filter = new IntentFilter();??
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);?
registerReceiver(mNetworkStateReceiver, filter);?

2. 应用退出时，Service关闭，在Service的onDestroy方法中取消监听：
//取消监听
unregisterReceiver(mNetworkStateReceiver);?