如何确定Android互联网连接? [英] How to determine Android internet connection?

问题描述

如何确定 Android 设备当前可用的互联网连接类型?例如让它返回 WiFi，3G，无.

How can I determine the current internet connection type available to an Android device? e.g. have it return WiFi, 3G, none.

推荐答案

你可以用这个来判断你是否已连接:

You can use this to determine whether you are connected:

final ConnectivityManager connectManager = (ConnectivityManager)ctx.getSystemService(Context.CONNECTIVITY_SERVICE); // ctx stands for the Context
final NetworkInfo mobile = connectManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
final NetworkInfo wifi   = connectManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI  );

// Return true if connected, either in 3G or wi-fi
return ((mobile != null && mobile.getState() == NetworkInfo.State.CONNECTED) || 
        (wifi   != null && wifi.getState()   == NetworkInfo.State.CONNECTED)   );
}

此代码需要权限ACCESS_NETWORK_STATE 和ACCESS_WIFI_STATE.

编辑:public NetworkInfo getNetworkInfo (int networkType) 已在 API 21 中弃用.对于高于 20 的 API 级别，您可以执行以下操作:

EDIT: public NetworkInfo getNetworkInfo (int networkType) has been deprecated in API 21. For API levels higher than 20 you can do as follows:

final Network[] networks = connectManager.getAllNetworks();
boolean connected = false;

for (int ctr = 0; !connected && ctr < networks.length; ++ctr) {
    final NetworkInfo network = connectManager.getNetworkInfo(networks[ctr]);
    final int netType = network.getType();

    connected = (network.getState() == NetworkInfo.State.CONNECTED) &&
            (
                netType == ConnectivityManager.TYPE_MOBILE     ||
                netType == ConnectivityManager.TYPE_WIFI     /*||
                netType == ConnectivityManager.TYPE_WIMAX      ||
                netType == ConnectivityManager.TYPE_ETHERNET */  );
}

return connected;

根据 OP 的问题，我将此代码限制为 Wi-Fi 和 3G，但很容易将其扩展到新添加的连接类型，例如以太网或 Wi-Max.

I limited this code to Wi-Fi and 3G as per the OP's question but it's easy to extend it to newly added connection types such as Ethernet or Wi-Max.

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