如何检查WiFi或3G网络可在Android设备 [英] how to check wifi or 3g network is available on android device

问题描述

在这里，我的Andr​​oid设备同时支持WiFi和3G。在特定时间的网络可在此设备上。因为我的要求是，当3G是可用我要上传少量数据。当无线可用整个数据必须上传。所以，我要检查连接WiFi或3G。请帮我。提前致谢。

Here, my android device supports both wifi and 3g. At particular time which network is available on this device. Because my requirement is when 3g is available I have to upload small amount of data. when wifi is available entire data have to upload. So, I have to check connection is wifi or 3g. Please help me. Thanks in advance.

推荐答案

我用这样的：

/**
 * Checks if we have a valid Internet Connection on the device.
 * @param ctx
 * @return True if device has internet
 *
 * Code from: http://www.androidsnippets.org/snippets/131/
 */
public static boolean haveInternet(Context ctx) {

    NetworkInfo info = (NetworkInfo) ((ConnectivityManager) ctx
            .getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();

    if (info == null || !info.isConnected()) {
        return false;
    }
    if (info.isRoaming()) {
        // here is the roaming option you can change it if you want to
        // disable internet while roaming, just return false
        return false;
    }
    return true;
}

您还需要

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

在AndroidMainfest.xml

in AndroidMainfest.xml

为了让您可以使用此code段的网络类型：

ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

//mobile
State mobile = conMan.getNetworkInfo(0).getState();

//wifi
State wifi = conMan.getNetworkInfo(1).getState();

，然后用它这样的：

and then use it like that:

if (mobile == NetworkInfo.State.CONNECTED || mobile == NetworkInfo.State.CONNECTING) {
    //mobile
} else if (wifi == NetworkInfo.State.CONNECTED || wifi == NetworkInfo.State.CONNECTING) {
    //wifi
}

要获得移动网络我会尝试<一的类型href="http://developer.android.com/reference/android/telephony/TelephonyManager.html#getNetworkType%28%29">TelephonyManager#getNetworkType或<一href="http://developer.android.com/reference/android/net/NetworkInfo.html#getSubtypeName%28%29">NetworkInfo#getSubtypeName

To get the type of the mobile network I would try TelephonyManager#getNetworkType or NetworkInfo#getSubtypeName

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