SyncAdaptr.doUploadSync(): Add "interface" param to mark it as from t…

…he app.

Add:
interface: murrayc.com-android-galaxyzoo
to the parameters in the content of the POST to make it easier for
the server to identify the app as the source of the classifications.
See #11

app/src/androidTest/java/com/murrayc/galaxyzoo/app/provider/test/ZooniverseClientTest.java

@@ -216,6 +216,8 @@ public void testUploadWithSuccess() throws IOException, InterruptedException {
         final URL mockUrl = server.getUrl("/");
         final ZooniverseClient client = new ZooniverseClient(getContext(), mockUrl.toString());
 
+        //SyncAdapter.doUploadSync() adds an "interface" parameter too,
+        //but we are testing a more generic API here:
         List<NameValuePair> values = new ArrayList<>();
         values.add(new BasicNameValuePair("classification[subject_ids][]", "504e4a38c499611ea6010c6a"));
         values.add(new BasicNameValuePair("classification[favorite][]", "true"));

app/src/main/java/com/murrayc/galaxyzoo/app/syncadapter/SyncAdapter.java

@@ -322,11 +322,18 @@ private void removeItem(final String itemId) {
 
     private boolean doUploadSync(final String itemId, final String subjectId, final String authName, final String authApiKey) {
 
-        final String PARAM_PART_CLASSIFICATION = "classification";
 
         //Note: I tried using HttpPost.getParams().setParameter() instead of the NameValuePairs,
         //but that did not allow multiple parameters with the same name, which we need.
         final List<NameValuePair> nameValuePairs = new ArrayList<>();
+
+        //Help the server know that the classification is from this Android app,
+        //by reusing the User-Agent string as a parameter value.
+        //See https://github.com/murraycu/android-galaxyzoo/issues/11
+        nameValuePairs.add(new BasicNameValuePair("interface",
+                HttpUtils.USER_AGENT_MURRAYC));
+
+        final String PARAM_PART_CLASSIFICATION = "classification";
         nameValuePairs.add(new BasicNameValuePair(PARAM_PART_CLASSIFICATION + "[subject_ids][]",
                 subjectId));