FoldersFragment.java

package com.naman14.timber.fragments;

import android.app.Activity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ProgressBar;

import com.afollestad.appthemeengine.ATE;
import com.naman14.timber.R;
import com.naman14.timber.adapters.FolderAdapter;
import com.naman14.timber.utils.PreferencesUtility;
import com.naman14.timber.widgets.DividerItemDecoration;
import com.naman14.timber.widgets.FastScroller;

import java.io.File;

/**
 * Created by nv95 on 10.11.16.
 */

public class FoldersFragment extends Fragment {

    private FolderAdapter mAdapter;
    private RecyclerView recyclerView;
    private FastScroller fastScroller;
    private ProgressBar mProgressBar;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(
                R.layout.fragment_folders, container, false);

        Toolbar toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
        ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);

        ActionBar ab = ((AppCompatActivity) getActivity()).getSupportActionBar();
        ab.setHomeAsUpIndicator(R.drawable.ic_menu);
        ab.setDisplayHomeAsUpEnabled(true);
        ab.setTitle(R.string.folders);

        recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview);
        fastScroller = (FastScroller) rootView.findViewById(R.id.fastscroller);
        mProgressBar = (ProgressBar) rootView.findViewById(R.id.progressBar);

        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        if (getActivity() != null)
            new loadFolders().execute("");
        return rootView;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        boolean dark = PreferenceManager.getDefaultSharedPreferences(getActivity()).getBoolean("dark_theme", false);
        if (dark) {
            ATE.apply(this, "dark_theme");
        } else {
            ATE.apply(this, "light_theme");
        }
        if (mAdapter != null) {
            mAdapter.applyTheme(dark);
            mAdapter.notifyDataSetChanged();
        }
    }

    private void setItemDecoration() {
        recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST));
    }

    @Override
    public void onActivityCreated(final Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        //setHasOptionsMenu(true);
    }

    public void updateTheme() {
        Context context = getActivity();
        if (context != null) {
            boolean dark = PreferenceManager.getDefaultSharedPreferences(context).getBoolean("dark_theme", false);
            mAdapter.applyTheme(dark);
        }
    }

    private class loadFolders extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
            Activity activity = getActivity();
            if (activity != null) {
                mAdapter = new FolderAdapter(activity, new File(PreferencesUtility.getInstance(activity).getLastFolder()));
                updateTheme();
            }
            return "Executed";
        }

        @Override
        protected void onPostExecute(String result) {
            recyclerView.setAdapter(mAdapter);
            //to add spacing between cards
            if (getActivity() != null) {
                setItemDecoration();
            }
            mAdapter.notifyDataSetChanged();
            mProgressBar.setVisibility(View.GONE);
            fastScroller.setVisibility(View.VISIBLE);
            fastScroller.setRecyclerView(recyclerView);
        }

        @Override
        protected void onPreExecute() {
        }
    }
}