如何检测，当WIFI连接已经建立的Andr​​oid？ [英] How to detect when WIFI Connection has been established in Android?

问题描述

我需要检测时，我有过WIFI的网络连接。什么广播被发送到建立已经作出了有效的网络连接。我需要验证的HTTP有效的网络连接存在。我应该听什么额外的测试，我需要让知道，一个有效的连接是否存在。

I need to detect when I have network connectivity over WIFI. What broadcast is sent to establish that a valid network connection has been made. I need to validate that a valid network connection for HTTP exists. What should I listen for and what additional tests do I need to make to know that a valid connection exists.

推荐答案

您可以注册一个<一个href="http://developer.android.com/reference/android/content/BroadcastReceiver.html"><$c$c>BroadcastReceiver得到通知时，建立一个无线连接（或者连接更改）。

You can register a BroadcastReceiver to be notified when a WiFi connection is established (or if the connection changed).

注册的BroadcastReceiver ：

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
registerReceiver(broadcastReceiver, intentFilter);

，然后在的BroadcastReceiver 做这样的事情：

@Override
public void onReceive(Context context, Intent intent) {
    final String action = intent.getAction();
    if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION)) {
        if (intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, false)){
            //do stuff
        } else {
            // wifi connection was lost
        }
    }
}

有关更多信息，请参阅文件<一个href="http://developer.android.com/reference/android/content/BroadcastReceiver.html"><$c$c>BroadcastReceiver和<一href="http://developer.android.com/reference/android/net/wifi/WifiManager.html"><$c$c>WifiManager

For more info, see the documentation for BroadcastReceiver and WifiManager

当然，你应该检查设备是否已连接到无线网络在此之前。

Of course you should check whether the device is already connected to WiFi before this.

编辑： 由于禁止，地球工程，这里有一个方法来检查设备是否已连接：

Thanks to ban-geoengineering, here's a method to check whether the device is already connected:

    private boolean isConnectedViaWifi() {
         ConnectivityManager connectivityManager = (ConnectivityManager) appObj.getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkInfo mWifi = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);     
         return mWifi.isConnected();
    }

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