Add fast scroller for MultiRedditListingActivity and FollowedUsersListingFragment.

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/MultiRedditListingActivity.java

@@ -36,6 +36,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import me.zhanghai.android.fastscroll.FastScrollerBuilder;
 import ml.docilealligator.infinityforreddit.Adapter.MultiRedditListingRecyclerViewAdapter;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.InsertMultiRedditAsyncTask;
@@ -179,6 +180,7 @@ public class MultiRedditListingActivity extends BaseActivity {
                 }
             }
         });
+        new FastScrollerBuilder(mRecyclerView).build();
 
         mMultiRedditViewModel = new ViewModelProvider(this,
                 new MultiRedditViewModel.Factory(getApplication(), mRedditDataRoomDatabase, mAccountName))

app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/FollowedUsersRecyclerViewAdapter.java

@@ -21,6 +21,7 @@ import java.util.List;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
+import me.zhanghai.android.fastscroll.PopupTextProvider;
 import ml.docilealligator.infinityforreddit.Activity.ViewUserDetailActivity;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.FavoriteThing;
@@ -30,7 +31,7 @@ import ml.docilealligator.infinityforreddit.SubscribedUserDatabase.SubscribedUse
 import pl.droidsonroids.gif.GifImageView;
 import retrofit2.Retrofit;
 
-public class FollowedUsersRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+public class FollowedUsersRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements PopupTextProvider {
     private static final int VIEW_TYPE_FAVORITE_USER_DIVIDER = 0;
     private static final int VIEW_TYPE_FAVORITE_USER = 1;
     private static final int VIEW_TYPE_USER_DIVIDER = 2;
@@ -289,6 +290,21 @@ public class FollowedUsersRecyclerViewAdapter extends RecyclerView.Adapter<Recyc
         notifyDataSetChanged();
     }
 
+    @NonNull
+    @Override
+    public String getPopupText(int position) {
+        switch (getItemViewType(position)) {
+            case VIEW_TYPE_USER_DIVIDER:
+                int offset = (mFavoriteSubscribedUserData != null && mFavoriteSubscribedUserData.size() > 0) ?
+                        mFavoriteSubscribedUserData.size() + 2 : 0;
+                return mSubscribedUserData.get(position - offset).getName().substring(0, 1).toUpperCase();
+            case VIEW_TYPE_FAVORITE_USER:
+                return mFavoriteSubscribedUserData.get(position - 1).getName().substring(0, 1).toUpperCase();
+            default:
+                return "";
+        }
+    }
+
     class FavoriteUserViewHolder extends RecyclerView.ViewHolder {
         @BindView(R.id.thing_icon_gif_image_view_item_subscribed_thing)
         GifImageView iconGifImageView;

app/src/main/java/ml/docilealligator/infinityforreddit/Adapter/MultiRedditListingRecyclerViewAdapter.java

@@ -22,6 +22,7 @@ import java.util.List;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
+import me.zhanghai.android.fastscroll.PopupTextProvider;
 import ml.docilealligator.infinityforreddit.Activity.ViewMultiRedditDetailActivity;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.Fragment.MultiRedditOptionsBottomSheetFragment;
@@ -32,7 +33,7 @@ import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import pl.droidsonroids.gif.GifImageView;
 import retrofit2.Retrofit;
 
-public class MultiRedditListingRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+public class MultiRedditListingRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>  implements PopupTextProvider {
 
     private static final int VIEW_TYPE_FAVORITE_MULTI_REDDIT_DIVIDER = 0;
     private static final int VIEW_TYPE_FAVORITE_MULTI_REDDIT = 1;
@@ -328,6 +329,21 @@ public class MultiRedditListingRecyclerViewAdapter extends RecyclerView.Adapter<
         notifyDataSetChanged();
     }
 
+    @NonNull
+    @Override
+    public String getPopupText(int position) {
+        switch (getItemViewType(position)) {
+            case VIEW_TYPE_MULTI_REDDIT:
+                int offset = (mFavoriteMultiReddits != null && mFavoriteMultiReddits.size() > 0) ?
+                        mFavoriteMultiReddits.size() + 2 : 0;
+                return mMultiReddits.get(position - offset).getDisplayName().substring(0, 1).toUpperCase();
+            case VIEW_TYPE_FAVORITE_MULTI_REDDIT:
+                return mFavoriteMultiReddits.get(position - 1).getDisplayName().substring(0, 1).toUpperCase();
+            default:
+                return "";
+        }
+    }
+
     class MultiRedditViewHolder extends RecyclerView.ViewHolder {
         @BindView(R.id.multi_reddit_icon_gif_image_view_item_multi_reddit)
         GifImageView iconImageView;

app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/FollowedUsersListingFragment.java

@@ -29,6 +29,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import me.zhanghai.android.fastscroll.FastScrollerBuilder;
 import ml.docilealligator.infinityforreddit.Activity.BaseActivity;
 import ml.docilealligator.infinityforreddit.Activity.SubscribedThingListingActivity;
 import ml.docilealligator.infinityforreddit.Adapter.FollowedUsersRecyclerViewAdapter;
@@ -108,6 +109,7 @@ public class FollowedUsersListingFragment extends Fragment implements FragmentCo
                 mOauthRetrofit, mRedditDataRoomDatabase, customThemeWrapper,
                 getArguments().getString(EXTRA_ACCESS_TOKEN));
         mRecyclerView.setAdapter(adapter);
+        new FastScrollerBuilder(mRecyclerView).build();
 
         mSubscribedUserViewModel = new ViewModelProvider(this,
                 new SubscribedUserViewModel.Factory(mActivity.getApplication(), mRedditDataRoomDatabase, getArguments().getString(EXTRA_ACCOUNT_NAME)))