Update android.cake

eng/devices/android.cake

@@ -26,7 +26,13 @@ bool DEVICE_BOOT_WAIT = Argument("wait", true);
 // set up env
 var ANDROID_SDK_ROOT = Argument("android", EnvironmentVariable("ANDROID_SDK_ROOT") ?? EnvironmentVariable("ANDROID_HOME"));
 if (string.IsNullOrEmpty(ANDROID_SDK_ROOT)) {
-	throw new Exception("Environment variable 'ANDROID_SDK_ROOT' or 'ANDROID_HOME' must be set to the Android SDK root.");
+	if(!string.IsNullOrEmpty(EnvironmentVariable("ANDROIDSDK")))
+	{
+		ANDROID_SDK_ROOT = EnvironmentVariable("ANDROIDSDK").Replace("/tools/android","")
+	}
+	else {
+		throw new Exception("Environment variable 'ANDROID_SDK_ROOT' or 'ANDROID_HOME' must be set to the Android SDK root.");
+	}
 }
 System.Environment.SetEnvironmentVariable("PATH",
 	$"{ANDROID_SDK_ROOT}/tools/bin" + System.IO.Path.PathSeparator +