Magisk/app/src/main/java/com/topjohnwu/magisk/fragments/ReposFragment.java

package com.topjohnwu.magisk.fragments;

import android.app.AlertDialog;
import android.os.Bundle;
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.SearchView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.RecyclerView;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

import com.topjohnwu.magisk.Config;
import com.topjohnwu.magisk.R;
import com.topjohnwu.magisk.adapters.ReposAdapter;
import com.topjohnwu.magisk.components.BaseFragment;
import com.topjohnwu.magisk.tasks.UpdateRepos;
import com.topjohnwu.magisk.utils.Event;

import butterknife.BindView;

public class ReposFragment extends BaseFragment {

    @BindView(R.id.recyclerView) RecyclerView recyclerView;
    @BindView(R.id.empty_rv) TextView emptyRv;
    @BindView(R.id.swipeRefreshLayout) SwipeRefreshLayout mSwipeRefreshLayout;

    private ReposAdapter adapter;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_repos, container, false);
        unbinder = new ReposFragment_ViewBinding(this, view);

        mSwipeRefreshLayout.setRefreshing(true);
        mSwipeRefreshLayout.setOnRefreshListener(() -> new UpdateRepos().exec(true));

        adapter = new ReposAdapter();
        recyclerView.setAdapter(adapter);
        recyclerView.setVisibility(View.GONE);

        requireActivity().setTitle(R.string.downloads);

        return view;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        Event.unregister(adapter);
    }

    @Override
    public int[] getListeningEvents() {
        return new int[] {Event.REPO_LOAD_DONE};
    }

    @Override
    public void onEvent(int event) {
        adapter.notifyDBChanged(false);
        Event.register(adapter);
        mSwipeRefreshLayout.setRefreshing(false);
        boolean empty = adapter.getItemCount() == 0;
        recyclerView.setVisibility(empty ? View.GONE : View.VISIBLE);
        emptyRv.setVisibility(empty ? View.VISIBLE : View.GONE);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.menu_repo, menu);
        SearchView search = (SearchView) menu.findItem(R.id.repo_search).getActionView();
        adapter.setSearchView(search);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.repo_sort) {
            new AlertDialog.Builder(getActivity())
                .setTitle(R.string.sorting_order)
                .setSingleChoiceItems(R.array.sorting_orders,
                        Config.get(Config.Key.REPO_ORDER), (d, which) -> {
                    Config.set(Config.Key.REPO_ORDER, which);
                    adapter.notifyDBChanged(true);
                    d.dismiss();
                }).show();
        }
        return true;
    }
}