greatly fix all the follower/ing stuff

closes #1334 (assuming)
closes #1340 (by implementing API search)
closes #1342
closes #1472
closes #1473

app/src/main/java/awais/instagrabber/adapters/FollowAdapter.java

@@ -12,12 +12,13 @@ import androidx.recyclerview.widget.RecyclerView;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 import awais.instagrabber.R;
 import awais.instagrabber.adapters.viewholder.FollowsViewHolder;
 import awais.instagrabber.databinding.ItemFollowBinding;
 import awais.instagrabber.interfaces.OnGroupClickListener;
-import awais.instagrabber.models.FollowModel;
+import awais.instagrabber.repositories.responses.User;
 import awais.instagrabber.utils.TextUtils;
 import thoughtbot.expandableadapter.ExpandableGroup;
 import thoughtbot.expandableadapter.ExpandableList;
@@ -27,28 +28,33 @@ import thoughtbot.expandableadapter.GroupViewHolder;
 // thanks to ThoughtBot's ExpandableRecyclerViewAdapter
 //   https://github.com/thoughtbot/expandable-recycler-view
 public final class FollowAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements OnGroupClickListener, Filterable {
+    private final View.OnClickListener onClickListener;
+    private final ExpandableList expandableListOriginal;
+    private final boolean hasManyGroups;
+    private ExpandableList expandableList;
+
     private final Filter filter = new Filter() {
         @Nullable
         @Override
         protected FilterResults performFiltering(final CharSequence filter) {
-            if (expandableList.groups != null) {
-                final boolean isFilterEmpty = TextUtils.isEmpty(filter);
-                final String query = isFilterEmpty ? null : filter.toString().toLowerCase();
-
-                for (int x = 0; x < expandableList.groups.size(); ++x) {
-                    final ExpandableGroup expandableGroup = expandableList.groups.get(x);
-                    final List<FollowModel> items = expandableGroup.getItems(false);
-                    final int itemCount = expandableGroup.getItemCount(false);
-
-                    for (int i = 0; i < itemCount; ++i) {
-                        final FollowModel followModel = items.get(i);
-
-                        if (isFilterEmpty) followModel.setShown(true);
-                        else followModel.setShown(hasKey(query, followModel.getUsername(), followModel.getFullName()));
-                    }
+            final List<User> filteredItems = new ArrayList<User>();
+            if (expandableListOriginal.groups == null || TextUtils.isEmpty(filter)) return null;
+            final String query = filter.toString().toLowerCase();
+            final ArrayList<ExpandableGroup> groups = new ArrayList<ExpandableGroup>();
+            for (int x = 0; x < expandableListOriginal.groups.size(); ++x) {
+                final ExpandableGroup expandableGroup = expandableListOriginal.groups.get(x);
+                final String title = expandableGroup.getTitle();
+                final List<User> items = expandableGroup.getItems();
+                if (items != null) {
+                    final List<User> toReturn = items.stream()
+                            .filter(u -> hasKey(query, u.getUsername(), u.getFullName()))
+                            .collect(Collectors.toList());
+                    groups.add(new ExpandableGroup(title, toReturn));
                 }
             }
-            return null;
+            final FilterResults filterResults = new FilterResults();
+            filterResults.values = new ExpandableList(groups, expandableList.expandedGroupIndexes);
+            return filterResults;
         }
 
         private boolean hasKey(final String key, final String username, final String name) {
@@ -60,15 +66,20 @@ public final class FollowAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
 
         @Override
         protected void publishResults(final CharSequence constraint, final FilterResults results) {
+            if (results == null) {
+                expandableList = expandableListOriginal;
+            }
+            else {
+                final ExpandableList filteredList = (ExpandableList) results.values;
+                expandableList = filteredList;
+            }
             notifyDataSetChanged();
         }
     };
-    private final View.OnClickListener onClickListener;
-    private final ExpandableList expandableList;
-    private final boolean hasManyGroups;
 
     public FollowAdapter(final View.OnClickListener onClickListener, @NonNull final ArrayList<ExpandableGroup> groups) {
-        this.expandableList = new ExpandableList(groups);
+        this.expandableListOriginal = new ExpandableList(groups);
+        expandableList = this.expandableListOriginal;
         this.onClickListener = onClickListener;
         this.hasManyGroups = groups.size() > 1;
     }
@@ -104,7 +115,7 @@ public final class FollowAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
             gvh.toggle(isGroupExpanded(group));
             return;
         }
-        final FollowModel model = group.getItems(true).get(hasManyGroups ? listPos.childPos : position);
+        final User model = group.getItems().get(hasManyGroups ? listPos.childPos : position);
         ((FollowsViewHolder) holder).bind(model, onClickListener);
     }
 
@@ -124,7 +135,7 @@ public final class FollowAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
 
         final int groupPos = listPosition.groupPos;
         final int positionStart = expandableList.getFlattenedGroupIndex(listPosition) + 1;
-        final int positionEnd = expandableList.groups.get(groupPos).getItemCount(true);
+        final int positionEnd = expandableList.groups.get(groupPos).getItemCount();
 
         final boolean isExpanded = expandableList.expandedGroupIndexes[groupPos];
         expandableList.expandedGroupIndexes[groupPos] = !isExpanded;

app/src/main/java/awais/instagrabber/adapters/viewholder/FollowsViewHolder.java

@@ -6,7 +6,6 @@ import androidx.annotation.NonNull;
 import androidx.recyclerview.widget.RecyclerView;
 
 import awais.instagrabber.databinding.ItemFollowBinding;
-import awais.instagrabber.models.FollowModel;
 import awais.instagrabber.repositories.responses.User;
 
 public final class FollowsViewHolder extends RecyclerView.ViewHolder {
@@ -27,14 +26,4 @@ public final class FollowsViewHolder extends RecyclerView.ViewHolder {
         binding.fullName.setText(model.getFullName());
         binding.profilePic.setImageURI(model.getProfilePicUrl());
     }
-
-    public void bind(final FollowModel model,
-                     final View.OnClickListener onClickListener) {
-        if (model == null) return;
-        itemView.setTag(model);
-        itemView.setOnClickListener(onClickListener);
-        binding.username.setUsername("@" + model.getUsername());
-        binding.fullName.setText(model.getFullName());
-        binding.profilePic.setImageURI(model.getProfilePicUrl());
-    }
 }

app/src/main/java/awais/instagrabber/fragments/FollowViewerFragment.kt

@@ -1,453 +1,260 @@
-package awais.instagrabber.fragments;
+package awais.instagrabber.fragments
 
-import android.content.Context;
-import android.content.res.Resources;
-import android.os.Bundle;
-import android.util.Log;
-import android.view.LayoutInflater;
-import android.view.Menu;
-import android.view.MenuInflater;
-import android.view.MenuItem;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.Toast;
+import android.content.Context
+import android.content.res.Resources
+import android.os.Bundle
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.Menu
+import android.view.MenuInflater
+import android.view.MenuItem
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Toast
 
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.appcompat.app.ActionBar;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.appcompat.widget.SearchView;
-import androidx.fragment.app.Fragment;
-import androidx.navigation.fragment.NavHostFragment;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
+import androidx.annotation.NonNull
+import androidx.annotation.Nullable
+import androidx.appcompat.app.ActionBar
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.SearchView
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import androidx.navigation.fragment.NavHostFragment
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 
-import java.util.ArrayList;
+import java.util.ArrayList
 
-import awais.instagrabber.R;
-import awais.instagrabber.adapters.FollowAdapter;
-import awais.instagrabber.customviews.helpers.RecyclerLazyLoader;
-import awais.instagrabber.databinding.FragmentFollowersViewerBinding;
-import awais.instagrabber.models.FollowModel;
-import awais.instagrabber.repositories.responses.FriendshipListFetchResponse;
-import awais.instagrabber.utils.AppExecutors;
-import awais.instagrabber.utils.CoroutineUtilsKt;
-import awais.instagrabber.utils.TextUtils;
-import awais.instagrabber.webservices.FriendshipRepository;
-import awais.instagrabber.webservices.ServiceCallback;
-import kotlinx.coroutines.Dispatchers;
-import thoughtbot.expandableadapter.ExpandableGroup;
+import awais.instagrabber.R
+import awais.instagrabber.adapters.FollowAdapter
+import awais.instagrabber.customviews.helpers.RecyclerLazyLoader
+import awais.instagrabber.databinding.FragmentFollowersViewerBinding
+import awais.instagrabber.models.Resource
+import awais.instagrabber.repositories.responses.User
+import awais.instagrabber.utils.AppExecutors
+import awais.instagrabber.viewmodels.FollowViewModel
+import thoughtbot.expandableadapter.ExpandableGroup
 
-public final class FollowViewerFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener {
-    private static final String TAG = "FollowViewerFragment";
+class FollowViewerFragment : Fragment(), SwipeRefreshLayout.OnRefreshListener {
+    private val followModels: ArrayList<User> = ArrayList<User>()
+    private val followingModels: ArrayList<User> = ArrayList<User>()
+    private val followersModels: ArrayList<User> = ArrayList<User>()
+    private val allFollowing: ArrayList<User> = ArrayList<User>()
+    private val moreAvailable = true
+    private var isFollowersList = false
+    private var isCompare = false
+    private var shouldRefresh = true
+    private var searching = false
+    private var profileId: Long = 0
+    private var username: String? = null
+    private var namePost: String? = null
+    private var type = 0
+    private var root: SwipeRefreshLayout? = null
+    private var adapter: FollowAdapter? = null
+    private lateinit var lazyLoader: RecyclerLazyLoader
+    private lateinit var fragmentActivity: AppCompatActivity
+    private lateinit var viewModel: FollowViewModel
+    private lateinit var binding: FragmentFollowersViewerBinding
 
-    private final ArrayList<FollowModel> followModels = new ArrayList<>();
-    private final ArrayList<FollowModel> followingModels = new ArrayList<>();
-    private final ArrayList<FollowModel> followersModels = new ArrayList<>();
-    private final ArrayList<FollowModel> allFollowing = new ArrayList<>();
-
-    private boolean moreAvailable = true, isFollowersList, isCompare = false, loading = false, shouldRefresh = true, searching = false;
-    private long profileId;
-    private String username;
-    private String namePost;
-    private String type;
-    private String endCursor;
-    private Resources resources;
-    private LinearLayoutManager layoutManager;
-    private RecyclerLazyLoader lazyLoader;
-    private FollowModel model;
-    private FollowAdapter adapter;
-    private View.OnClickListener clickListener;
-    private FragmentFollowersViewerBinding binding;
-    private SwipeRefreshLayout root;
-    private FriendshipRepository friendshipRepository;
-    private AppCompatActivity fragmentActivity;
-
-    final ServiceCallback<FriendshipListFetchResponse> followingFetchCb = new ServiceCallback<FriendshipListFetchResponse>() {
-        @Override
-        public void onSuccess(final FriendshipListFetchResponse result) {
-            if (result != null && isCompare) {
-                followingModels.addAll(result.getItems());
-                if (!isFollowersList) followModels.addAll(result.getItems());
-                if (result.isMoreAvailable()) {
-                    endCursor = result.getNextMaxId();
-                    friendshipRepository.getList(
-                            false,
-                            profileId,
-                            endCursor,
-                            CoroutineUtilsKt.getContinuation((response, throwable) -> AppExecutors.INSTANCE.getMainThread().execute(() -> {
-                                if (throwable != null) {
-                                    onFailure(throwable);
-                                    return;
-                                }
-                                onSuccess(response);
-                            }), Dispatchers.getIO())
-                    );
-                } else if (followersModels.size() == 0) {
-                    if (!isFollowersList) moreAvailable = false;
-                    friendshipRepository.getList(
-                            true,
-                            profileId,
-                            null,
-                            CoroutineUtilsKt.getContinuation((response, throwable) -> AppExecutors.INSTANCE.getMainThread().execute(() -> {
-                                if (throwable != null) {
-                                    followingFetchCb.onFailure(throwable);
-                                    return;
-                                }
-                                followingFetchCb.onSuccess(response);
-                            }), Dispatchers.getIO())
-                    );
-                } else {
-                    if (!isFollowersList) moreAvailable = false;
-                    showCompare();
-                }
-            } else if (isCompare) binding.swipeRefreshLayout.setRefreshing(false);
-        }
-
-        @Override
-        public void onFailure(final Throwable t) {
-            try {
-                binding.swipeRefreshLayout.setRefreshing(false);
-                Toast.makeText(getContext(), t.getMessage(), Toast.LENGTH_SHORT).show();
-            } catch (Throwable ignored) {}
-            Log.e(TAG, "Error fetching list (double, following)", t);
-        }
-    };
-    final ServiceCallback<FriendshipListFetchResponse> followersFetchCb = new ServiceCallback<FriendshipListFetchResponse>() {
-        @Override
-        public void onSuccess(final FriendshipListFetchResponse result) {
-            if (result != null && isCompare) {
-                followersModels.addAll(result.getItems());
-                if (isFollowersList) followModels.addAll(result.getItems());
-                if (result.isMoreAvailable()) {
-                    endCursor = result.getNextMaxId();
-                    friendshipRepository.getList(
-                            true,
-                            profileId,
-                            endCursor,
-                            CoroutineUtilsKt.getContinuation((response, throwable) -> AppExecutors.INSTANCE.getMainThread().execute(() -> {
-                                if (throwable != null) {
-                                    onFailure(throwable);
-                                    return;
-                                }
-                                onSuccess(response);
-                            }), Dispatchers.getIO())
-                    );
-                } else if (followingModels.size() == 0) {
-                    if (isFollowersList) moreAvailable = false;
-                    friendshipRepository.getList(
-                            false,
-                            profileId,
-                            null,
-                            CoroutineUtilsKt.getContinuation((response, throwable) -> AppExecutors.INSTANCE.getMainThread().execute(() -> {
-                                if (throwable != null) {
-                                    followingFetchCb.onFailure(throwable);
-                                    return;
-                                }
-                                followingFetchCb.onSuccess(response);
-                            }), Dispatchers.getIO())
-                    );
-                } else {
-                    if (isFollowersList) moreAvailable = false;
-                    showCompare();
-                }
-            } else if (isCompare) binding.swipeRefreshLayout.setRefreshing(false);
-        }
-
-        @Override
-        public void onFailure(final Throwable t) {
-            try {
-                binding.swipeRefreshLayout.setRefreshing(false);
-                Toast.makeText(getContext(), t.getMessage(), Toast.LENGTH_SHORT).show();
-            } catch (Throwable ignored) {}
-            Log.e(TAG, "Error fetching list (double, follower)", t);
-        }
-    };
-
-    @Override
-    public void onCreate(@Nullable final Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        friendshipRepository = FriendshipRepository.Companion.getInstance();
-        fragmentActivity = (AppCompatActivity) getActivity();
-        setHasOptionsMenu(true);
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        fragmentActivity = activity as AppCompatActivity
+        viewModel = ViewModelProvider(this).get(FollowViewModel::class.java)
+        setHasOptionsMenu(true)
     }
 
-    @NonNull
-    @Override
-    public View onCreateView(@NonNull final LayoutInflater inflater, @Nullable final ViewGroup container, @Nullable final Bundle savedInstanceState) {
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
         if (root != null) {
-            shouldRefresh = false;
-            return root;
+            shouldRefresh = false
+            return root!!
         }
-        binding = FragmentFollowersViewerBinding.inflate(getLayoutInflater());
-        root = binding.getRoot();
-        return root;
+        binding = FragmentFollowersViewerBinding.inflate(layoutInflater)
+        root = binding.root
+        return root!!
     }
 
-    @Override
-    public void onViewCreated(@NonNull final View view, @Nullable final Bundle savedInstanceState) {
-        if (!shouldRefresh) return;
-        init();
-        shouldRefresh = false;
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        if (!shouldRefresh) return
+        init()
+        shouldRefresh = false
     }
 
-    private void init() {
-        if (getArguments() == null) return;
-        final FollowViewerFragmentArgs fragmentArgs = FollowViewerFragmentArgs.fromBundle(getArguments());
-        profileId = fragmentArgs.getProfileId();
-        isFollowersList = fragmentArgs.getIsFollowersList();
-        username = fragmentArgs.getUsername();
-        namePost = username;
-        if (TextUtils.isEmpty(username)) {
-            // this usually should not occur
-            username = "You";
-            namePost = "You're";
+    private fun init() {
+        val args = arguments ?: return
+        val fragmentArgs = FollowViewerFragmentArgs.fromBundle(args)
+        viewModel.userId.value = fragmentArgs.profileId
+        isFollowersList = fragmentArgs.isFollowersList
+        username = fragmentArgs.username
+        namePost = username
+        setTitle(username)
+        binding.swipeRefreshLayout.setOnRefreshListener(this)
+        if (isCompare) listCompare() else listFollows()
+        viewModel.fetch(isFollowersList, null)
+    }
+
+    override fun onResume() {
+        super.onResume()
+        setTitle(username)
+        setSubtitle(type)
+    }
+
+    private fun setTitle(title: String?) {
+        val actionBar: ActionBar = fragmentActivity.supportActionBar ?: return
+        actionBar.title = title
+    }
+
+    private fun setSubtitle(subtitleRes: Int) {
+        val actionBar: ActionBar = fragmentActivity.supportActionBar ?: return
+        actionBar.setSubtitle(subtitleRes)
+    }
+
+    override fun onRefresh() {
+        lazyLoader.resetState()
+        viewModel.clearProgress()
+        if (isCompare) listCompare()
+        else viewModel.fetch(isFollowersList, null)
+    }
+
+    private fun listFollows() {
+        viewModel.comparison.removeObservers(viewLifecycleOwner)
+        viewModel.status.removeObservers(viewLifecycleOwner)
+        type = if (isFollowersList) R.string.followers_type_followers else R.string.followers_type_following
+        setSubtitle(type)
+        val layoutManager = LinearLayoutManager(context)
+        lazyLoader = RecyclerLazyLoader(layoutManager, { _, totalItemsCount ->
+            binding.swipeRefreshLayout.isRefreshing = true
+            val liveData = if (searching) viewModel.search(isFollowersList)
+                           else viewModel.fetch(isFollowersList, null)
+            liveData.observe(viewLifecycleOwner) {
+                binding.swipeRefreshLayout.isRefreshing = it.status != Resource.Status.SUCCESS
+                layoutManager.scrollToPosition(totalItemsCount)
+            }
+        })
+        binding.rvFollow.addOnScrollListener(lazyLoader)
+        binding.rvFollow.layoutManager = layoutManager
+        viewModel.getList(isFollowersList).observe(viewLifecycleOwner) {
+            binding.swipeRefreshLayout.isRefreshing = false
+            refreshAdapter(it, null, null, null)
         }
-        setTitle(username);
-        resources = getResources();
-        clickListener = v -> {
-            final Object tag = v.getTag();
-            if (tag instanceof FollowModel) {
-                model = (FollowModel) tag;
-                final FollowViewerFragmentDirections.ActionFollowViewerFragmentToProfileFragment action = FollowViewerFragmentDirections
-                        .actionFollowViewerFragmentToProfileFragment();
-                action.setUsername("@" + model.getUsername());
-                NavHostFragment.findNavController(this).navigate(action);
+    }
+
+    private fun listCompare() {
+        viewModel.getList(isFollowersList).removeObservers(viewLifecycleOwner)
+        binding.rvFollow.clearOnScrollListeners()
+        binding.swipeRefreshLayout.isRefreshing = true
+        setSubtitle(R.string.followers_compare)
+        viewModel.status.observe(viewLifecycleOwner) {}
+        viewModel.comparison.observe(viewLifecycleOwner) {
+            if (it != null) {
+                binding.swipeRefreshLayout.isRefreshing = false
+                refreshAdapter(null, it.first, it.second, it.third)
             }
-        };
-        binding.swipeRefreshLayout.setOnRefreshListener(this);
-        onRefresh();
+        }
     }
 
-    @Override
-    public void onResume() {
-        super.onResume();
-        setTitle(username);
-        setSubtitle(type);
-    }
-
-    private void setTitle(final String title) {
-        final ActionBar actionBar = fragmentActivity.getSupportActionBar();
-        if (actionBar == null) return;
-        actionBar.setTitle(title);
-    }
-
-    private void setSubtitle(final String subtitle) {
-        final ActionBar actionBar = fragmentActivity.getSupportActionBar();
-        if (actionBar == null) return;
-        actionBar.setSubtitle(subtitle);
-    }
-
-    private void setSubtitle(@SuppressWarnings("SameParameterValue") final int subtitleRes) {
-        final ActionBar actionBar = fragmentActivity.getSupportActionBar();
-        if (actionBar == null) return;
-        actionBar.setSubtitle(subtitleRes);
-    }
-
-    @Override
-    public void onRefresh() {
-        if (isCompare) listCompare();
-        else listFollows();
-        endCursor = null;
-        lazyLoader.resetState();
-    }
-
-    private void listFollows() {
-        type = resources.getString(isFollowersList ? R.string.followers_type_followers : R.string.followers_type_following);
-        setSubtitle(type);
-        final ServiceCallback<FriendshipListFetchResponse> cb = new ServiceCallback<FriendshipListFetchResponse>() {
-            @Override
-            public void onSuccess(final FriendshipListFetchResponse result) {
-                if (result == null) {
-                    binding.swipeRefreshLayout.setRefreshing(false);
-                    return;
-                }
-                int oldSize = followModels.size() == 0 ? 0 : followModels.size() - 1;
-                followModels.addAll(result.getItems());
-                if (result.isMoreAvailable()) {
-                    moreAvailable = true;
-                    endCursor = result.getNextMaxId();
-                } else moreAvailable = false;
-                binding.swipeRefreshLayout.setRefreshing(false);
-                if (isFollowersList) followersModels.addAll(result.getItems());
-                else followingModels.addAll(result.getItems());
-                refreshAdapter(followModels, null, null, null);
-                layoutManager.scrollToPosition(oldSize);
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
+        inflater.inflate(R.menu.follow, menu)
+        val menuSearch = menu.findItem(R.id.action_search)
+        val searchView = menuSearch.actionView as SearchView
+        searchView.queryHint = resources.getString(R.string.action_search)
+        searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
+            override fun onQueryTextSubmit(query: String): Boolean {
+                return false
             }
 
-            @Override
-            public void onFailure(final Throwable t) {
-                try {
-                    binding.swipeRefreshLayout.setRefreshing(false);
-                    Toast.makeText(getContext(), t.getMessage(), Toast.LENGTH_SHORT).show();
-                } catch (Throwable ignored) {}
-                Log.e(TAG, "Error fetching list (single)", t);
-            }
-        };
-        layoutManager = new LinearLayoutManager(getContext());
-        lazyLoader = new RecyclerLazyLoader(layoutManager, (page, totalItemsCount) -> {
-            if (!TextUtils.isEmpty(endCursor) && !searching) {
-                binding.swipeRefreshLayout.setRefreshing(true);
-                layoutManager.setStackFromEnd(true);
-                friendshipRepository.getList(
-                        isFollowersList,
-                        profileId,
-                        endCursor,
-                        CoroutineUtilsKt.getContinuation((response, throwable) -> AppExecutors.INSTANCE.getMainThread().execute(() -> {
-                            if (throwable != null) {
-                                cb.onFailure(throwable);
-                                return;
-                            }
-                            cb.onSuccess(response);
-                        }), Dispatchers.getIO())
-                );
-                endCursor = null;
-            }
-        });
-        binding.rvFollow.addOnScrollListener(lazyLoader);
-        binding.rvFollow.setLayoutManager(layoutManager);
-        if (moreAvailable) {
-            binding.swipeRefreshLayout.setRefreshing(true);
-            friendshipRepository.getList(
-                    isFollowersList,
-                    profileId,
-                    endCursor,
-                    CoroutineUtilsKt.getContinuation((response, throwable) -> AppExecutors.INSTANCE.getMainThread().execute(() -> {
-                        if (throwable != null) {
-                            cb.onFailure(throwable);
-                            return;
+            override fun onQueryTextChange(query: String): Boolean {
+                if (query.isNullOrEmpty()) {
+                    if (!isCompare && searching) {
+                        viewModel.setQuery(null, isFollowersList)
+                        viewModel.getSearch().removeObservers(viewLifecycleOwner)
+                        viewModel.getList(isFollowersList).observe(viewLifecycleOwner) {
+                            refreshAdapter(it, null, null, null)
                         }
-                        cb.onSuccess(response);
-                    }), Dispatchers.getIO())
-            );
+                    }
+                    searching = false
+                    return true
+                }
+                searching = true
+                if (isCompare && adapter != null) {
+                    adapter!!.filter.filter(query)
+                    return true
+                }
+                viewModel.getList(isFollowersList).removeObservers(viewLifecycleOwner)
+                binding.swipeRefreshLayout.isRefreshing = true
+                viewModel.setQuery(query, isFollowersList)
+                viewModel.getSearch().observe(viewLifecycleOwner) {
+                    binding.swipeRefreshLayout.isRefreshing = false
+                    refreshAdapter(it, null, null, null)
+                }
+                return true
+            }
+        })
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        if (item.itemId != R.id.action_compare) return super.onOptionsItemSelected(item)
+        binding.rvFollow.adapter = null
+        if (isCompare) {
+            isCompare = false
+            listFollows()
         } else {
-            refreshAdapter(followModels, null, null, null);
-            layoutManager.scrollToPosition(0);
+            isCompare = true
+            listCompare()
         }
+        return true
     }
 
-    private void listCompare() {
-        layoutManager.setStackFromEnd(false);
-        binding.rvFollow.clearOnScrollListeners();
-        loading = true;
-        setSubtitle(R.string.followers_compare);
-        allFollowing.clear();
-        if (moreAvailable) {
-            binding.swipeRefreshLayout.setRefreshing(true);
-            Toast.makeText(getContext(), R.string.follower_start_compare, Toast.LENGTH_LONG).show();
-            friendshipRepository.getList(
-                    isFollowersList,
-                    profileId,
-                    endCursor,
-                    CoroutineUtilsKt.getContinuation((response, throwable) -> AppExecutors.INSTANCE.getMainThread().execute(() -> {
-                        final ServiceCallback<FriendshipListFetchResponse> callback = isFollowersList ? followersFetchCb : followingFetchCb;
-                        if (throwable != null) {
-                            callback.onFailure(throwable);
-                            return;
-                        }
-                        callback.onSuccess(response);
-                    }), Dispatchers.getIO())
-            );
-        } else if (followersModels.size() == 0 || followingModels.size() == 0) {
-            binding.swipeRefreshLayout.setRefreshing(true);
-            Toast.makeText(getContext(), R.string.follower_start_compare, Toast.LENGTH_LONG).show();
-            friendshipRepository.getList(
-                    !isFollowersList,
-                    profileId,
-                    null,
-                    CoroutineUtilsKt.getContinuation((response, throwable) -> AppExecutors.INSTANCE.getMainThread().execute(() -> {
-                        final ServiceCallback<FriendshipListFetchResponse> callback = isFollowersList ? followingFetchCb : followersFetchCb;
-                        if (throwable != null) {
-                            callback.onFailure(throwable);
-                            return;
-                        }
-                        callback.onSuccess(response);
-                    }), Dispatchers.getIO()));
-        } else showCompare();
-    }
-
-    private void showCompare() {
-        allFollowing.addAll(followersModels);
-        allFollowing.retainAll(followingModels);
-
-        for (final FollowModel followModel : allFollowing) {
-            followersModels.remove(followModel);
-            followingModels.remove(followModel);
-        }
-
-        allFollowing.trimToSize();
-        followersModels.trimToSize();
-        followingModels.trimToSize();
-
-        binding.swipeRefreshLayout.setRefreshing(false);
-
-        refreshAdapter(null, followingModels, followersModels, allFollowing);
-    }
-
-    @Override
-    public void onCreateOptionsMenu(@NonNull final Menu menu, final MenuInflater inflater) {
-        inflater.inflate(R.menu.follow, menu);
-        final MenuItem menuSearch = menu.findItem(R.id.action_search);
-        final SearchView searchView = (SearchView) menuSearch.getActionView();
-        searchView.setQueryHint(getResources().getString(R.string.action_search));
-        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
-
-            @Override
-            public boolean onQueryTextSubmit(final String query) {
-                return false;
-            }
-
-            @Override
-            public boolean onQueryTextChange(final String query) {
-                if (TextUtils.isEmpty(query)) {
-                    searching = false;
-                    // refreshAdapter(followModels, followingModels, followersModels, allFollowing);
-                }
-                // else filter.filter(query.toLowerCase());
-                if (adapter != null) {
-                    searching = true;
-                    adapter.getFilter().filter(query);
-                }
-                return true;
-            }
-        });
-    }
-
-    @Override
-    public boolean onOptionsItemSelected(@NonNull final MenuItem item) {
-        if (item.getItemId() != R.id.action_compare) return super.onOptionsItemSelected(item);
-        binding.rvFollow.setAdapter(null);
-        final Context context = getContext();
-        if (loading) Toast.makeText(context, R.string.follower_wait_to_load, Toast.LENGTH_LONG).show();
-        else if (isCompare) {
-            isCompare = false;
-            listFollows();
-        } else {
-            isCompare = true;
-            listCompare();
-        }
-        return true;
-    }
-
-    private void refreshAdapter(final ArrayList<FollowModel> followModels,
-                                final ArrayList<FollowModel> followingModels,
-                                final ArrayList<FollowModel> followersModels,
-                                final ArrayList<FollowModel> allFollowing) {
-        loading = false;
-        final ArrayList<ExpandableGroup> groups = new ArrayList<>(1);
-
+    private fun refreshAdapter(
+        followModels: List<User>?,
+        allFollowing: List<User>?,
+        followingModels: List<User>?,
+        followersModels: List<User>?
+    ) {
+        val groups: ArrayList<ExpandableGroup> = ArrayList<ExpandableGroup>(1)
         if (isCompare && followingModels != null && followersModels != null && allFollowing != null) {
-            if (followingModels.size() > 0)
-                groups.add(new ExpandableGroup(resources.getString(R.string.followers_not_following, username), followingModels));
-            if (followersModels.size() > 0)
-                groups.add(new ExpandableGroup(resources.getString(R.string.followers_not_follower, namePost), followersModels));
-            if (allFollowing.size() > 0)
-                groups.add(new ExpandableGroup(resources.getString(R.string.followers_both_following), allFollowing));
+            if (followingModels.size > 0) groups.add(
+                ExpandableGroup(
+                    getString(
+                        R.string.followers_not_following,
+                        username
+                    ), followingModels
+                )
+            )
+            if (followersModels.size > 0) groups.add(
+                ExpandableGroup(
+                    getString(
+                        R.string.followers_not_follower,
+                        namePost
+                    ), followersModels
+                )
+            )
+            if (allFollowing.size > 0) groups.add(
+                ExpandableGroup(
+                    getString(R.string.followers_both_following),
+                    allFollowing
+                )
+            )
         } else if (followModels != null) {
-            groups.add(new ExpandableGroup(type, followModels));
-        } else return;
-        adapter = new FollowAdapter(clickListener, groups);
-        adapter.toggleGroup(0);
-        binding.rvFollow.setAdapter(adapter);
+            groups.add(ExpandableGroup(getString(type), followModels))
+        } else return
+        adapter = FollowAdapter({ v ->
+            val tag = v.tag
+            if (tag is User) {
+                val model = tag
+                val bundle = Bundle()
+                bundle.putString("username", model.username)
+                NavHostFragment.findNavController(this).navigate(R.id.action_global_profileFragment, bundle)
+            }
+        }, groups)
+        adapter!!.toggleGroup(0)
+        binding.rvFollow.adapter = adapter!!
+    }
+
+    companion object {
+        private const val TAG = "FollowViewerFragment"
     }
 }

app/src/main/java/awais/instagrabber/models/FollowModel.kt

@@ -1,49 +0,0 @@
-package awais.instagrabber.models
-
-import java.io.Serializable
-
-class FollowModel(
-    val id: String,
-    val username: String,
-    val fullName: String,
-    val profilePicUrl: String
-) : Serializable {
-    private var hasNextPage = false
-        get() = endCursor != null && field
-
-    var isShown = true
-
-    var endCursor: String? = null
-        private set
-
-    fun setPageCursor(hasNextPage: Boolean, endCursor: String?) {
-        this.endCursor = endCursor
-        this.hasNextPage = hasNextPage
-    }
-
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (javaClass != other?.javaClass) return false
-
-        other as FollowModel
-
-        if (id != other.id) return false
-        if (username != other.username) return false
-        if (fullName != other.fullName) return false
-        if (profilePicUrl != other.profilePicUrl) return false
-        if (isShown != other.isShown) return false
-        if (endCursor != other.endCursor) return false
-
-        return true
-    }
-
-    override fun hashCode(): Int {
-        var result = id.hashCode()
-        result = 31 * result + username.hashCode()
-        result = 31 * result + fullName.hashCode()
-        result = 31 * result + profilePicUrl.hashCode()
-        result = 31 * result + isShown.hashCode()
-        result = 31 * result + (endCursor?.hashCode() ?: 0)
-        return result
-    }
-}

app/src/main/java/awais/instagrabber/repositories/FriendshipService.kt

@@ -1,6 +1,7 @@
 package awais.instagrabber.repositories
 
 import awais.instagrabber.repositories.responses.FriendshipChangeResponse
+import awais.instagrabber.repositories.responses.FriendshipListFetchResponse
 import awais.instagrabber.repositories.responses.FriendshipRestrictResponse
 import retrofit2.http.*
 
@@ -25,7 +26,7 @@ interface FriendshipService {
         @Path("userId") userId: Long,
         @Path("type") type: String,  // following or followers
         @QueryMap(encoded = true) queryParams: Map<String, String>,
-    ): String
+    ): FriendshipListFetchResponse
 
     @FormUrlEncoded
     @POST("/api/v1/friendships/{action}/")

app/src/main/java/awais/instagrabber/repositories/responses/FriendshipListFetchResponse.kt

@@ -1,27 +1,10 @@
 package awais.instagrabber.repositories.responses
 
-import awais.instagrabber.models.FollowModel
-
 data class FriendshipListFetchResponse(
     var nextMaxId: String?,
     var status: String?,
-    var items: List<FollowModel>?
+    var users: List<User>?
 ) {
     val isMoreAvailable: Boolean
         get() = !nextMaxId.isNullOrBlank()
-
-    fun setNextMaxId(nextMaxId: String): FriendshipListFetchResponse {
-        this.nextMaxId = nextMaxId
-        return this
-    }
-
-    fun setStatus(status: String): FriendshipListFetchResponse {
-        this.status = status
-        return this
-    }
-
-    fun setItems(items: List<FollowModel>): FriendshipListFetchResponse {
-        this.items = items
-        return this
-    }
 }

app/src/main/java/awais/instagrabber/viewmodels/FollowViewModel.kt

@@ -1,19 +1,167 @@
-package awais.instagrabber.viewmodels;
+package awais.instagrabber.viewmodels
 
-import androidx.lifecycle.MutableLiveData;
-import androidx.lifecycle.ViewModel;
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MediatorLiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import awais.instagrabber.models.Resource
+import awais.instagrabber.repositories.responses.User
+import awais.instagrabber.webservices.FriendshipRepository
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 
-import java.util.List;
+class FollowViewModel : ViewModel() {
+    // data
+    val userId = MutableLiveData<Long>()
+    private val followers = MutableLiveData<List<User>>()
+    private val followings = MutableLiveData<List<User>>()
+    private val searchResults = MutableLiveData<List<User>>()
 
-import awais.instagrabber.models.FollowModel;
+    // cursors
+    private val followersMaxId = MutableLiveData<String?>("")
+    private val followingMaxId = MutableLiveData<String?>("")
+    private val searchingMaxId = MutableLiveData<String?>("")
+    private val searchQuery = MutableLiveData<String?>()
 
-public class FollowViewModel extends ViewModel {
-    private MutableLiveData<List<FollowModel>> list;
-
-    public MutableLiveData<List<FollowModel>> getList() {
-        if (list == null) {
-            list = new MutableLiveData<>();
+    // comparison
+    val status: LiveData<Pair<Boolean, Boolean>> = object : MediatorLiveData<Pair<Boolean, Boolean>>() {
+            init {
+                postValue(Pair(false, false))
+                addSource(followersMaxId) {
+                    if (it == null) {
+                        postValue(Pair(true, value!!.second))
+                    }
+                    else fetch(true, it)
+                }
+                addSource(followingMaxId) {
+                    if (it == null) {
+                        postValue(Pair(value!!.first, true))
+                    }
+                    else fetch(false, it)
+                }
+            }
         }
-        return list;
+    val comparison: LiveData<Triple<List<User>, List<User>, List<User>>> =
+        object : MediatorLiveData<Triple<List<User>, List<User>, List<User>>>() {
+            init {
+                addSource(status) {
+                    if (it.first && it.second) {
+                        val followersList = followers.value!!
+                        val followingList = followings.value!!
+                        val allUsers: MutableList<User> = mutableListOf()
+                        allUsers.addAll(followersList)
+                        allUsers.addAll(followingList)
+                        val followersMap = followersList.groupBy { it.pk }
+                        val followingMap = followingList.groupBy { it.pk }
+                        val mutual: MutableList<User> = mutableListOf()
+                        val onlyFollowing: MutableList<User> = mutableListOf()
+                        val onlyFollowers: MutableList<User> = mutableListOf()
+                        allUsers.forEach {
+                            val isFollowing = followingMap.get(it.pk) != null
+                            val isFollower = followersMap.get(it.pk) != null
+                            if (isFollowing && isFollower) mutual.add(it)
+                            else if (isFollowing) onlyFollowing.add(it)
+                            else if (isFollower) onlyFollowers.add(it)
+                        }
+                        postValue(Triple(mutual, onlyFollowing, onlyFollowers))
+                    }
+                }
+            }
+        }
+
+    private val friendshipRepository: FriendshipRepository by lazy { FriendshipRepository.getInstance() }
+
+    // fetch: supply max ID for continuous fetch
+    fun fetch(follower: Boolean, nextMaxId: String?): LiveData<Resource<Any?>> {
+        val data = MutableLiveData<Resource<Any?>>()
+        data.postValue(Resource.loading(null))
+        val maxId = if (follower) followersMaxId else followingMaxId
+        if (maxId.value == null && nextMaxId == null) data.postValue(Resource.success(null))
+        else if (userId.value == null) data.postValue(Resource.error("No user ID supplied!", null))
+        else viewModelScope.launch(Dispatchers.IO) {
+            try {
+                val tempList = friendshipRepository.getList(
+                    follower,
+                    userId.value!!,
+                    nextMaxId ?: maxId.value,
+                    null
+                )
+                if (!tempList.status.equals("ok")) {
+                    data.postValue(Resource.error("Status not ok!", null))
+                }
+                else {
+                    if (tempList.users != null) {
+                        val liveData = if (follower) followers else followings
+                        val currentList = if (liveData.value != null) liveData.value!!.toMutableList()
+                                          else mutableListOf()
+                        currentList.addAll(tempList.users!!)
+                        liveData.postValue(currentList.toList())
+                    }
+                    maxId.postValue(tempList.nextMaxId)
+                    data.postValue(Resource.success(null))
+                }
+            } catch (e: Exception) {
+                data.postValue(Resource.error(e.message, null))
+            }
+        }
+        return data
     }
-}
+
+    fun getList(follower: Boolean): LiveData<List<User>> {
+        return if (follower) followers else followings
+    }
+
+    fun search(follower: Boolean): LiveData<Resource<Any?>> {
+        val data = MutableLiveData<Resource<Any?>>()
+        data.postValue(Resource.loading(null))
+        val query = searchQuery.value
+        if (searchingMaxId.value == null) data.postValue(Resource.success(null))
+        else if (userId.value == null) data.postValue(Resource.error("No user ID supplied!", null))
+        else if (query.isNullOrEmpty()) data.postValue(Resource.error("No query supplied!", null))
+        else viewModelScope.launch(Dispatchers.IO) {
+            try {
+                val tempList = friendshipRepository.getList(
+                    follower,
+                    userId.value!!,
+                    searchingMaxId.value,
+                    query
+                )
+                if (!tempList.status.equals("ok")) {
+                    data.postValue(Resource.error("Status not ok!", null))
+                }
+                else {
+                    if (tempList.users != null) {
+                        val currentList = if (searchResults.value != null) searchResults.value!!.toMutableList()
+                                          else mutableListOf()
+                        currentList.addAll(tempList.users!!)
+                        searchResults.postValue(currentList.toList())
+                    }
+                    searchingMaxId.postValue(tempList.nextMaxId)
+                    data.postValue(Resource.success(null))
+                }
+            } catch (e: Exception) {
+                data.postValue(Resource.error(e.message, null))
+            }
+        }
+        return data
+    }
+
+    fun getSearch(): LiveData<List<User>> {
+        return searchResults
+    }
+
+    fun setQuery(query: String?, follower: Boolean) {
+        searchQuery.value = query
+        if (!query.isNullOrEmpty()) search(follower)
+    }
+
+    fun clearProgress() {
+        followersMaxId.value = ""
+        followingMaxId.value = ""
+        searchingMaxId.value = ""
+        followings.value = listOf<User>()
+        followers.value = listOf<User>()
+        searchResults.value = listOf<User>()
+    }
+}

app/src/main/java/awais/instagrabber/webservices/FriendshipRepository.kt

@@ -1,15 +1,11 @@
 package awais.instagrabber.webservices
 
-import awais.instagrabber.models.FollowModel
 import awais.instagrabber.repositories.FriendshipService
 import awais.instagrabber.repositories.responses.FriendshipChangeResponse
 import awais.instagrabber.repositories.responses.FriendshipListFetchResponse
 import awais.instagrabber.repositories.responses.FriendshipRestrictResponse
 import awais.instagrabber.utils.Utils
 import awais.instagrabber.webservices.RetrofitFactory.retrofit
-import org.json.JSONArray
-import org.json.JSONException
-import org.json.JSONObject
 
 class FriendshipRepository(private val service: FriendshipService) {
 
@@ -113,43 +109,12 @@ class FriendshipRepository(private val service: FriendshipService) {
         follower: Boolean,
         targetUserId: Long,
         maxId: String?,
+        query: String?
     ): FriendshipListFetchResponse {
-        val queryMap = if (maxId != null) mapOf("max_id" to maxId) else emptyMap()
-        val response = service.getList(targetUserId, if (follower) "followers" else "following", queryMap)
-        return parseListResponse(response)
-    }
-
-    @Throws(JSONException::class)
-    private fun parseListResponse(body: String): FriendshipListFetchResponse {
-        val root = JSONObject(body)
-        val nextMaxId = root.optString("next_max_id")
-        val status = root.optString("status")
-        val itemsJson = root.optJSONArray("users")
-        val items = parseItems(itemsJson)
-        return FriendshipListFetchResponse(
-            nextMaxId,
-            status,
-            items
-        )
-    }
-
-    @Throws(JSONException::class)
-    private fun parseItems(items: JSONArray?): List<FollowModel> {
-        if (items == null) {
-            return emptyList()
-        }
-        val followModels = mutableListOf<FollowModel>()
-        for (i in 0 until items.length()) {
-            val itemJson = items.optJSONObject(i) ?: continue
-            val followModel = FollowModel(
-                itemJson.getString("pk"),
-                itemJson.getString("username"),
-                itemJson.optString("full_name"),
-                itemJson.getString("profile_pic_url")
-            )
-            followModels.add(followModel)
-        }
-        return followModels
+        val queryMap: MutableMap<String, String> = mutableMapOf()
+        if (!maxId.isNullOrEmpty()) queryMap.set("max_id", maxId)
+        if (!query.isNullOrEmpty()) queryMap.set("query", query)
+        return service.getList(targetUserId, if (follower) "followers" else "following", queryMap.toMap())
     }
 
     companion object {

app/src/main/java/thoughtbot/expandableadapter/ExpandableGroup.java

@@ -3,13 +3,13 @@ package thoughtbot.expandableadapter;
 import java.util.ArrayList;
 import java.util.List;
 
-import awais.instagrabber.models.FollowModel;
+import awais.instagrabber.repositories.responses.User;
 
 public class ExpandableGroup {
     private final String title;
-    private final List<FollowModel> items;
+    private final List<User> items;
 
-    public ExpandableGroup(final String title, final List<FollowModel> items) {
+    public ExpandableGroup(final String title, final List<User> items) {
         this.title = title;
         this.items = items;
     }
@@ -18,22 +18,13 @@ public class ExpandableGroup {
         return title;
     }
 
-    public List<FollowModel> getItems(final boolean filtered) {
-        if (!filtered) return items;
-        final ArrayList<FollowModel> followModels = new ArrayList<>();
-        for (final FollowModel followModel : items) if (followModel.isShown()) followModels.add(followModel);
-        return followModels;
+    public List<User> getItems() {
+        return items;
     }
 
-    public int getItemCount(final boolean filtered) {
+    public int getItemCount() {
         if (items != null) {
-            final int size = items.size();
-            if (filtered) {
-                int finalSize = 0;
-                for (int i = 0; i < size; ++i) if (items.get(i).isShown()) ++finalSize;
-                return finalSize;
-            }
-            return size;
+            return items.size();
         }
         return 0;
     }

app/src/main/java/thoughtbot/expandableadapter/ExpandableList.java

@@ -1,6 +1,7 @@
 package thoughtbot.expandableadapter;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 
 import java.util.ArrayList;
 
@@ -15,6 +16,13 @@ public final class ExpandableList {
         this.expandedGroupIndexes = new boolean[groupsSize];
     }
 
+    public ExpandableList(@NonNull final ArrayList<ExpandableGroup> groups,
+                          @Nullable final boolean[] expandedGroupIndexes) {
+        this.groups = groups;
+        this.groupsSize = groups.size();
+        this.expandedGroupIndexes = expandedGroupIndexes;
+    }
+
     public int getVisibleItemCount() {
         int count = 0;
         for (int i = 0; i < groupsSize; i++) count = count + numberOfVisibleItemsInGroup(i);
@@ -36,7 +44,7 @@ public final class ExpandableList {
     }
 
     private int numberOfVisibleItemsInGroup(final int group) {
-        return expandedGroupIndexes[group] ? groups.get(group).getItemCount(true) + 1 : 1;
+        return expandedGroupIndexes[group] ? groups.get(group).getItemCount() + 1 : 1;
     }
 
     public int getFlattenedGroupIndex(@NonNull final ExpandableListPosition listPosition) {

app/src/main/res/layout/fragment_followers_viewer.xml

@@ -16,6 +16,5 @@
         android:paddingLeft="8dp"
         android:paddingEnd="8dp"
         android:paddingRight="8dp"
-        app:layoutManager="LinearLayoutManager"
         tools:listitem="@layout/item_follow" />
 </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>