Rate the app in the app itself

1. Is it possible to evaluate the application by clicking on a button (for example), while not going to the Google Play page?
   It is impossible. Google Play does not have such an API, and never will . Why? - Because any application would have the opportunity to set ratings on its own on behalf of users.
2. Is it possible to somehow check the user rated the application or not?
   Not. Because you can not find out who put the assessment. Google Play again does not provide such an opportunity, which in my opinion is correct (anonymous evaluation)

Judging by the fact that in none of the many dozens of applications that I have encountered, this is not realized, but there is always a suggestion to evaluate in the store - you can only evaluate it in the store.

In fact, you can check whether the user left a comment in google play-e, but not in the traditional way =). This service is proof of that. At least earlier after installing the application, he demanded to leave a rating. A few years ago I was making a similar product and the customer had the same requirement. In the end, came up with the following solution:

 public static void getCommentsFromMarket(final int pageNumber, final String uid, String marketName, final CallBack callBack) { AsyncHttpClient client = new AsyncHttpClient(); String url = "https://play.google.com/store/getreviews"; RequestParams params = new RequestParams(); try { client.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; rv:8.0) Gecko/20100101 Firefox/8.0"); client.addHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"); client.addHeader("Accept-Language", "ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3"); client.addHeader("Accept-Encoding", "gzip, deflate"); client.addHeader("Accept-Charset", "windows-1251,utf-8;q=0.7,*;q=0.7"); client.addHeader("Connection", "keep-alive"); client.addHeader("Referer", "https://play.google.com"); params.put("reviewType", "0"); params.put("pageNum", String.valueOf(pageNumber)); params.put("id", marketName); params.put("reviewSortOrder", "0"); params.put("xhr", "1"); params.put("hl", "ru"); client.post(url, params, new AsyncHttpResponseHandler() { @Override public void onSuccess(String result) { // postDataToServer(pageNumber, uid, result, new CallBack()); if (result.contains(uid)) { callBack.onSuccess(true); } else { callBack.onSuccess(false); } } public void onFailure(Throwable th) { callBack.onFail(th.getLocalizedMessage()); } }); } catch (Exception e) { callBack.onFail(e.getLocalizedMessage()); } } 

where int pageNumber is the page number with comments, String uid is the user id in google plus. In the example I used the asyncHttpClient library. Actually, the method had to be run in a cycle over 10 pages, since as a rule, fresh comment was always within their framework.