import com.google.android.gms.ads.identifier.AdvertisingIdClient;
import com.google.android.gms.common.GoogleApiAvailability;
...
AdvertisingIdClient.Info adInfo = null;
try {
adInfo = AdvertisingIdClient.getAdvertisingIdInfo(context);
String advertisingId = adInfo.getId();
boolean isLimitAdTrackingEnabled = adInfo.isLimitAdTrackingEnabled();
} catch (GooglePlayServicesNotAvailableException e) {
e.printStackTrace();
} catch (GooglePlayServicesRepairableException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<meta-data
android:name="com.google.android.gms.ads.APPLICATION_ID"
android:value="YOUR_APP_ID"/>
