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本文摘抄自：https://blog.safaribooksonline.com/2014/01/16/advertising-id-android-kitkat/?utm_source=tuicool

Beginning in August, Google will replace the Android ID with the new Google Advertising ID.

Because Advertising ID is part of the Google Play services platform, you must first get the Google Play services SDK and set up your project. Note that Google provides good documentation on setting up the SDK which includes the following steps:

1. Copy the Google SDK library and import it into your project.
2. Update your app Manifest file.
3. Create a ProGuard exception to prevent ProGuard from stripping away required classes.
4. Ensure Devices Have the Google Play services APK.

See Install the Google Play Services SDK for more information.

Once setup, you will use the classes in package com.google.android.gms.ads.identifier, shown here:

To get the Advertising ID, you must first get an AdvertisingIdClient.Info object by calling the method getAdvertisingIdInfo(). Note that this must be done on its own thread and not on the main thread or you will get an IllegalStateException. The following code snippet shows an example of how to get the Advertising ID:

 1 import com.google.android.gms.ads.identifier.AdvertisingIdClient;
 2 import com.google.android.gms.ads.identifier.AdvertisingIdClient.Info;
 3 :
 4 :
 5 
 6 Info adInfo = null;
 7 
 8 try {
 9      adInfo = AdvertisingIdClient.getAdvertisingIdInfo(mContext);
10 } catch (IOException e) {
11      ...
12 } catch (GooglePlayServicesAvailabilityException e) {
13      ...
14 } catch (GooglePlayServicesNotAvailableException e) {
15      ...
16 }
17 
18 String AdId = adInfo.getId();
19 
20 :

Once you get the advertising ID you can use it instead of using the non-anonymous Android device ID.

Summary

Developers have a number of options to generate unique user identifiers. These include Telephony identifiers such as IMEI or the Android Device ID. Starting with Android 4.4, developers can use the Advertising ID that provides a user-specific, unique, and resettable ID for advertising, as provided by Google Play services.

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Android获取Advertising ID