Android Open Source - spring-a-gram-android Gallery Photo List Fragment

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2014 Roy Clarkson//w ww .  j ava 2  s  . c  o  m
 *
 * 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 com.royclarkson.springagram;

import android.app.Activity;
import android.app.Fragment;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ListAdapter;

import com.royclarkson.springagram.model.GalleryResource;
import com.royclarkson.springagram.model.ItemResource;

import org.springframework.core.ParameterizedTypeReference;
import org.springframework.hateoas.Resources;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

import java.util.ArrayList;
import java.util.List;

/**
 * {@link Fragment} that displays a list of {@link ItemResource}s assigned to the {@link GalleryResource}
 *
 * @author Roy Clarkson
 */
public class GalleryPhotoListFragment extends Fragment implements AbsListView.OnItemClickListener {

  private static final String TAG = GalleryPhotoListFragment.class.getSimpleName();

  private static final String ARG_GALLERY_PHOTOS_URI = "gallery_photos_uri";

  private String galleryPhotosUrl;

  private GalleryPhotoListFragmentListener galleryPhotoListFragmentListener;

  private AbsListView listView;

  private ListAdapter listAdapter;


  public GalleryPhotoListFragment() {
    // Required empty public constructor
  }

  public static GalleryPhotoListFragment newInstance(String galleryPhotosUrl) {
    GalleryPhotoListFragment fragment = new GalleryPhotoListFragment();
    Bundle args = new Bundle();
    args.putString(ARG_GALLERY_PHOTOS_URI, galleryPhotosUrl);
    fragment.setArguments(args);
    return fragment;
  }


  //***************************************
  // Fragment methods
  //***************************************

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments() != null) {
      this.galleryPhotosUrl = getArguments().getString(ARG_GALLERY_PHOTOS_URI);
    }
    fetchGalleryPhotoList();
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
               Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_photo, container, false);
    this.listView = (AbsListView) view.findViewById(android.R.id.list);
    this.listView.setOnItemClickListener(this);
    registerForContextMenu(this.listView);
    return view;
  }

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    setRetainInstance(true);
  }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
      this.galleryPhotoListFragmentListener = (GalleryPhotoListFragmentListener) activity;
    } catch (ClassCastException e) {
      throw new ClassCastException(activity.toString()
          + " must implement OnPhotoSelectedListener");
    }
  }

  @Override
  public void onDetach() {
    super.onDetach();
    this.galleryPhotoListFragmentListener = null;
  }

  @Override
  public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    MenuInflater inflater = new MenuInflater(this.getActivity());
    inflater.inflate(R.menu.gallery_photo_list_context_menu, menu);
  }

  @Override
  public boolean onContextItemSelected(MenuItem item) {
    AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
    switch (item.getItemId()) {
      case R.id.action_remove_from_gallery:
        removeFromGallery(info.position);
        return true;
      default:
        return super.onContextItemSelected(item);
    }
  }


  //***************************************
  // OnItemClickListener methods
  //***************************************

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    if (null != this.galleryPhotoListFragmentListener) {
      this.galleryPhotoListFragmentListener.onGalleryPhotoSelected(position);
    }
  }


  //***************************************
  // Listener interface
  //***************************************

  public interface GalleryPhotoListFragmentListener {

    public void onGalleryPhotoSelected(int position);

    public void onDownloadGalleryPhotosComplete(List<ItemResource> photos);

    public ItemResource getGalleryPhotoByPosition(int position);

    public void onRemovePhotoFromGalleryByPosition(int position);

  }


  //***************************************
  // Helper methods
  //***************************************

  public void fetchGalleryPhotoList() {
    new DownloadGalleryPhotosTask().execute(this.galleryPhotosUrl);
  }

  private void refreshPhotoList(Resources resources) {
    List<ItemResource> photos = new ArrayList<ItemResource>(resources.getContent());
    if (null != this.galleryPhotoListFragmentListener) {
      this.galleryPhotoListFragmentListener.onDownloadGalleryPhotosComplete(photos);
    }
    listAdapter = new PhotoListAdapter(getActivity(), photos);
    listView.setAdapter(listAdapter);
  }

  private void removeFromGallery(int position) {
    if (null != this.galleryPhotoListFragmentListener) {
      ItemResource itemResource = this.galleryPhotoListFragmentListener.getGalleryPhotoByPosition(position);
      new RemoveGalleryPhotoTask().execute(itemResource.getLink(ItemResource.REL_GALLERY).getHref());
      this.galleryPhotoListFragmentListener.onRemovePhotoFromGalleryByPosition(position);
      ((PhotoListAdapter) listAdapter).notifyDataSetChanged();
    }
  }


  //***************************************
  // Private classes
  //***************************************

  private class DownloadGalleryPhotosTask extends AsyncTask<String, Void, Resources> {

    @Override
    protected Resources doInBackground(String... params) {
      try {
        final String url = params[0];
        RestTemplate restTemplate = RestUtils.getInstance();
        ResponseEntity<Resources<ItemResource>> responseEntity = restTemplate.exchange(url, HttpMethod.GET,
            RestUtils.getRequestEntity(),
            new ParameterizedTypeReference<Resources<ItemResource>>() {
            });
        return responseEntity.getBody();
      } catch (Exception e) {
        Log.e(TAG, e.getMessage(), e);
      }

      return null;
    }

    @Override
    protected void onPostExecute(Resources resources) {
      refreshPhotoList(resources);
    }

  }

  private class RemoveGalleryPhotoTask extends AsyncTask<String, Void, Boolean> {

    @Override
    protected Boolean doInBackground(String... params) {
      try {
        final String url = params[0];
        RestTemplate restTemplate = RestUtils.getInstance();
        restTemplate.delete(url);
        return true;
      } catch (Exception e) {
        Log.e(TAG, e.getMessage(), e);
        return false;
      }
    }

    @Override
    protected void onPostExecute(Boolean success) {

    }

  }
}

Java Source Code List

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