Is there a way to check whether tethering is active?

Question

can I check programmaticall wheter the android device has tethering activated?

I just watched the WifiManager class. All vatraibles from the WifiInfo show the same values as iff the WIFI is turned off on the device.

Thnaks, best regards

Aliphatic

The tethering functionality is in the ConnectivityManager class, but hidden and not in the public API. If you intend to use the "unpublished API" you're going to need a modified framework JAR or use reflection. The method you're looking for is probably String[] ConnectivityManager#getTetheredIfaces(), which returns the currently tethered network interfaces. – Marquee

Answer 1

Try using reflection, like so:

WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
Method[] wmMethods = wifi.getClass().getDeclaredMethods();
for(Method method: wmMethods){
if(method.getName().equals("isWifiApEnabled")) {

try {
  method.invoke(wifi);
} catch (IllegalArgumentException e) {
  e.printStackTrace();
} catch (IllegalAccessException e) {
  e.printStackTrace();
} catch (InvocationTargetException e) {
  e.printStackTrace();
}
}

(It returns a Boolean)

---

As Dennis suggested it is better to use this :

    final Method method = manager.getClass().getDeclaredMethod("isWifiApEnabled");
    method.setAccessible(true); //in the case of visibility change in future APIs
    return (Boolean) method.invoke(manager);

(manager is the WiFiManager)

Aliber

There is no need to iterate all declared methods: the Class class have "getDeclaredMethod" method. Check out the code in my answer. – Volcanism

Answer 2

First, you need to get WifiManager:

Context context = ...
final WifiManager wifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);

Then:

public static boolean isSharingWiFi(final WifiManager manager)
{
    try
    {
        final Method method = manager.getClass().getDeclaredMethod("isWifiApEnabled");
        method.setAccessible(true); //in the case of visibility change in future APIs
        return (Boolean) method.invoke(manager);
    }
    catch (final Throwable ignored)
    {
    }

    return false;
}

Also you need to request a permission in AndroidManifest.xml:

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

Volcanism

What is the purpose of all the finals? Are these required in some instances? – Wound

@diedthreetimes: "What is the purpose of all the finals? Are these required in some instances?"—Coding style, each to their own. See should I use final and final abuse. – Brandebrandea

A little addition: one should check if the "getSystemService" returned null. – Volcanism

Does not work for me. I am getting an error: "Expected receiver of type android.net.wifi.WifiManager, but got java.lang.reflect.Method" – List