Replace Guava-implemented getUploadCount with RxJava2 version

app/build.gradle

@@ -25,14 +25,18 @@ dependencies {
     compile ('com.mapbox.mapboxsdk:mapbox-android-sdk:5.1.0@aar'){
         transitive=true
     }
+
+    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
+    // Because RxAndroid releases are few and far between, it is recommended you also
+    // explicitly depend on RxJava's latest version for bug fixes and new features.
+    compile 'io.reactivex.rxjava2:rxjava:2.1.2'
+
+
     compile 'com.facebook.fresco:fresco:1.3.0'
     compile 'com.facebook.stetho:stetho:1.5.0'
-    compile "com.google.guava:guava:${GUAVA_VERSION}"
 
     testCompile 'junit:junit:4.12'
-    testCompile ('org.robolectric:robolectric:3.3.2') {
-        exclude module: 'guava'
-    }
+    testCompile 'org.robolectric:robolectric:3.3.2'
 
     testCompile 'com.squareup.okhttp3:mockwebserver:3.8.1'
     androidTestCompile 'com.squareup.okhttp3:mockwebserver:3.8.1'

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsActivity.java

@@ -11,7 +11,6 @@
 import android.os.Bundle;
 import android.os.IBinder;
 import android.preference.PreferenceManager;
-import android.support.annotation.NonNull;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.app.LoaderManager;
 import android.support.v4.content.CursorLoader;
@@ -23,10 +22,6 @@
 import android.widget.Adapter;
 import android.widget.AdapterView;
 
-import com.google.common.util.concurrent.FutureCallback;
-import com.google.common.util.concurrent.Futures;
-import com.google.common.util.concurrent.ListenableFuture;
-
 import java.util.ArrayList;
 
 import butterknife.ButterKnife;
@@ -38,7 +33,9 @@
 import fr.free.nrw.commons.media.MediaDetailPagerFragment;
 import fr.free.nrw.commons.settings.Prefs;
 import fr.free.nrw.commons.upload.UploadService;
-import fr.free.nrw.commons.utils.ExecutorUtils;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.CompositeDisposable;
+import io.reactivex.schedulers.Schedulers;
 import timber.log.Timber;
 
 public  class       ContributionsActivity
@@ -68,6 +65,8 @@ Queued to Upload (Sorted in ascending order of time added - FIFO)
      */
     private String CONTRIBUTION_SORT = Contribution.Table.COLUMN_STATE + " DESC, " + Contribution.Table.COLUMN_UPLOADED + " DESC , (" + Contribution.Table.COLUMN_TIMESTAMP + " * " + Contribution.Table.COLUMN_STATE + ")";
 
+    private CompositeDisposable compositeDisposable = new CompositeDisposable();
+
     private ServiceConnection uploadServiceConnection = new ServiceConnection() {
         @Override
         public void onServiceConnected(ComponentName componentName, IBinder binder) {
@@ -84,6 +83,7 @@ public void onServiceDisconnected(ComponentName componentName) {
 
     @Override
     protected void onDestroy() {
+        compositeDisposable.clear();
         getSupportFragmentManager().removeOnBackStackChangedListener(this);
         super.onDestroy();
         if(isUploadServiceConnected) {
@@ -110,6 +110,8 @@ protected void onPause() {
         super.onPause();
     }
 
+
+
     @Override
     protected void onAuthCookieAcquired(String authCookie) {
         // Do a sync everytime we get here!
@@ -268,24 +270,21 @@ public int getTotalMediaCount() {
     }
 
     private void setUploadCount() {
-        UploadCountClient uploadCountClient = new UploadCountClient();
         CommonsApplication application = CommonsApplication.getInstance();
-        ListenableFuture<Integer> future = uploadCountClient
-                .getUploadCount(application.getCurrentAccount().name);
-        Futures.addCallback(future, new FutureCallback<Integer>() {
-            @Override
-            public void onSuccess(Integer uploadCount) {
-                getSupportActionBar().setSubtitle(getResources()
-                        .getQuantityString(R.plurals.contributions_subtitle,
-                                uploadCount,
-                                uploadCount));
-            }
-
-            @Override
-            public void onFailure(@NonNull Throwable t) {
-                Timber.e(t, "Fetching upload count failed");
-            }
-        }, ExecutorUtils.uiExecutor());
+
+        compositeDisposable.add(
+                RxJava2Tasks.getUploadCount(application.getCurrentAccount().name)
+                        .subscribeOn(Schedulers.io())
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .subscribe(
+                                uploadCount ->
+                                        getSupportActionBar().setSubtitle(getResources()
+                                                .getQuantityString(R.plurals.contributions_subtitle,
+                                                        uploadCount,
+                                                        uploadCount)),
+                                throwable -> Timber.e(throwable, "Fetching upload count failed")
+                        )
+        );
     }
 
     @Override

app/src/main/java/fr/free/nrw/commons/contributions/RxJava2Tasks.java

@@ -0,0 +1,30 @@
+package fr.free.nrw.commons.contributions;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.Locale;
+
+import fr.free.nrw.commons.PageTitle;
+import io.reactivex.Single;
+
+class RxJava2Tasks {
+
+    private static final String UPLOAD_COUNT_URL_TEMPLATE =
+            "https://tools.wmflabs.org/urbanecmbot/uploadsbyuser/uploadsbyuser.py?user=%s";
+
+    static Single<Integer> getUploadCount(String userName) {
+        return Single.fromCallable(() -> {
+                    URL url = new URL(String.format(Locale.ENGLISH, UPLOAD_COUNT_URL_TEMPLATE,
+                                new PageTitle(userName).getText()));
+                    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
+                    BufferedReader bufferedReader = new BufferedReader(new
+                            InputStreamReader(urlConnection.getInputStream()));
+                    String uploadCount = bufferedReader.readLine();
+                    bufferedReader.close();
+                    urlConnection.disconnect();
+                    return Integer.parseInt(uploadCount);
+        });
+    }
+}