android中监听wifi广播的方法

android中监听wifi广播有以下方法：

在清单xml文件里注册广播：

<receiver android:name=".WifiReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
<action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
<action android:name="android.net.wifi.STATE_CHANGE" />
</intent-filter>
</receiver>

用java代码注册广播：
IntentFilter filter = new IntentFilter();
filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(new WifiReceiver(), filter);

public class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {

if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction())) {//这个监听wifi的打开与关闭，与wifi的连接无关
int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
Log.i("WIFI状态", "wifiState"+wifiState);
switch (wifiState) {
case WifiManager.WIFI_STATE_DISABLED:
break;
case WifiManager.WIFI_STATE_DISABLING:
break;
case WifiManager.WIFI_STATE_ENABLING:
break;
case WifiManager.WIFI_STATE_ENABLED:
break;
case WifiManager.WIFI_STATE_UNKNOWN:
break;
}
}
// 这个监听wifi的连接状态即是否连上了一个有效无线路由，当上边广播的状态是WifiManager.WIFI_STATE_DISABLING，和WIFI_STATE_DISABLED的时候，根本不会接到这个广播。
// 在上边广播接到广播是WifiManager.WIFI_STATE_ENABLED状态的同时也会接到这个广播，当然刚打开wifi肯定还没有连接到有效的无线
if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())) {
Parcelable parcelableExtra = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
if (null != parcelableExtra) {
NetworkInfo networkInfo = (NetworkInfo) parcelableExtra;
State state = networkInfo.getState();
boolean isConnected = state==State.CONNECTED;//当然，这边可以更精确的确定状态
Log.i(this.getClass().getSimpleName(), "isConnected"+isConnected);
if(isConnected){
}else{

}
}
}
//这个监听网络连接的设置，包括wifi和移动数据的打开和关闭。.
//最好用的还是这个监听。wifi如果打开，关闭，以及连接上可用的连接都会接到监听。见log
// 这个广播的最大弊端是比上边两个广播的反应要慢，如果只是要监听wifi，我觉得还是用上边两个配合比较合适
if(ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())){
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo gprs = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
NetworkInfo wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
Log.i("CONNECTIVITY_ACTION", "网络状态改变:" + wifi.isConnected() + " 3g:" + gprs.isConnected());

NetworkInfo info = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
if (info != null) {
Log.i("CONNECTIVITY_ACTION", "info.getTypeName()"+info.getTypeName());
Log.i("CONNECTIVITY_ACTION", "getSubtypeName()"+info.getSubtypeName());
Log.i("CONNECTIVITY_ACTION", "getState()"+info.getState());
Log.i("CONNECTIVITY_ACTION",
"getDetailedState()"+info.getDetailedState().name());
Log.i("CONNECTIVITY_ACTION", "getDetailedState()"+info.getExtraInfo());
Log.i("CONNECTIVITY_ACTION", "getType()"+info.getType());
}
}

}
}