org.lathanh.android.mvp.demo.presenter.PresenterDemo_Fragment.java Source code

Introduction

Here is the source code for org.lathanh.android.mvp.demo.presenter.PresenterDemo_Fragment.java

Source

/*
 *   Copyright 2016 Robert LaThanh
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package org.lathanh.android.mvp.demo.presenter;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import org.lathanh.android.mvp.adapter.adaptable.AdaptableAdapter;
import org.lathanh.android.mvp.adapter.adaptable.AdaptableViewModel;
import org.lathanh.android.mvp.adapter.presenter.AdaptOnDemandPresenterBindingAdapter;
import org.lathanh.android.mvp.adapter.presenter.PresenterBindingAdapter;
import org.lathanh.android.mvp.demo.R;
import org.lathanh.android.mvp.demo.presenter.PresenterDemo_GreenPresenter.GreenAdaptableViewModel;
import org.lathanh.android.mvp.demo.presenter.PresenterDemo_RedPresenter.RedAdaptableViewModel;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;

/**
 * Demonstration of usage of
 * {@link org.lathanh.android.mvp.adapter.presenter.PresenterBindingAdapter},
 * the Presenter Adapter Framework.
 *
 * See {@code README.md} at root of demo project.
 *
 * @author Robert LaThanh 2016-04-05
 */
public class PresenterDemo_Fragment extends Fragment {

    //== Constants ==============================================================

    private static final int NUM_LIST_ELEMENTS = 500;

    //== Instance fields ========================================================

    protected RecyclerView recyclerView;

    //== Instance methods =======================================================

    //-- 'Fragment' methods -----------------------------------------------------

    /**
     * Starts a task to "load data."
     *
     * The data is a heterogeneous list of {@link PresenterDemo_RedPresenter Red}
     * and {@link PresenterDemo_GreenPresenter Green} items, which have slightly
     * different visual and onLongClick behavior.
     */
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final long debugLoadStartTime = System.currentTimeMillis();
        new AsyncTask<Void, Void, List>() {

            private PresenterDemo_GreenPresenter greenPresenter;
            private PresenterDemo_RedPresenter redPresenter;

            @Override
            protected List doInBackground(Void... params) {
                //-- "Load" data
                Random random = new Random(0xABCDEF); // same "randomness" every run
                List dataModels = new ArrayList(NUM_LIST_ELEMENTS);
                for (int i = 0; i < NUM_LIST_ELEMENTS; i++) {
                    int delayForItem = 6 + random.nextInt(11);
                    if (random.nextBoolean()) {
                        // green
                        dataModels.add(new GreenAdaptableViewModel(i, delayForItem, new Date()));
                    } else {
                        // red
                        dataModels.add(new RedAdaptableViewModel(i, delayForItem, System.currentTimeMillis()));
                    }
                }

                //-- Also prepare the Presenters for this data
                greenPresenter = new PresenterDemo_GreenPresenter();
                redPresenter = new PresenterDemo_RedPresenter();

                return dataModels;
            }

            @Override
            protected void onPostExecute(List list) {
                //-- Create the BindingAdapter and add the Presenters to it
                BindingAdapter bindingAdapter = new BindingAdapter(LayoutInflater.from(getContext()), list);
                bindingAdapter.addPresenter(greenPresenter.getLayoutId(), greenPresenter, greenPresenter,
                        greenPresenter);
                bindingAdapter.addPresenter(redPresenter.getLayoutId(), redPresenter, redPresenter, redPresenter);

                RecyclerView recyclerView = (RecyclerView) getActivity().findViewById(R.id.recycler_view);
                recyclerView.setAdapter(bindingAdapter);

                //-- Update view to show list
                getActivity().findViewById(R.id.loadingView).setVisibility(View.GONE);
                recyclerView.setVisibility(View.VISIBLE);

                long debugElapsedMs = System.currentTimeMillis() - debugLoadStartTime;
                Toast.makeText(getActivity(), "Load completed in " + debugElapsedMs + "ms", Toast.LENGTH_SHORT)
                        .show();
            }
        }.execute();
    } // onCreate()

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

        recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
        recyclerView.setLayoutManager(layoutManager);

        return view;
    }

    //== Private inner classes ==================================================

    private static class BindingAdapter<VM, AVM extends AdaptableViewModel<VM> & PresenterBindingAdapter.ItemViewType, AA extends AdaptableAdapter<VM, AVM>, VH extends RecyclerView.ViewHolder, VHF extends PresenterBindingAdapter.ViewHolderFactory<VH>>
            extends AdaptOnDemandPresenterBindingAdapter<VM, AVM, AA, VH, VHF> {

        private final List<AVM> items;

        public BindingAdapter(@NonNull LayoutInflater layoutInflater, @NonNull List<AVM> items) {
            super(layoutInflater);
            this.items = items;
        }

        @Override
        protected @NonNull AVM get(int position) {
            return items.get(position);
        }

        @Override
        public int getItemCount() {
            return items.size();
        }
    }

}