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/** * The MIT License (MIT)// w ww .ja v a2 s . c o m * Copyright (c) 2014 Lemberg Solutions Limited * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package com.ls.drupal8demo.adapters; import com.android.volley.RequestQueue; import com.android.volley.VolleyError; import com.android.volley.toolbox.ImageLoader; import com.android.volley.toolbox.ImageLoader.ImageCache; import com.android.volley.toolbox.NetworkImageView; import com.android.volley.toolbox.Volley; import com.ls.drupal.AbstractBaseDrupalEntity; import com.ls.drupal.AbstractBaseDrupalEntity.OnEntityRequestListener; import com.ls.drupal.DrupalClient; import com.ls.drupal8demo.R; import com.ls.drupal8demo.article.ArticlePreview; import com.ls.drupal8demo.article.Page; import com.ls.http.base.ResponseData; import android.content.Context; import android.graphics.Bitmap; import android.text.Html; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; import java.util.ArrayList; import java.util.List; public class CategoryArticlesListAdapter extends BaseAdapter implements OnEntityRequestListener { private final static int PRE_LOADING_PAGE_OFFSET = 4; private int mPagesLoaded = 0; private boolean mCanLoadMore; private Page mArticlePreviews; private final DrupalClient mDrupalClient; private final LayoutInflater mInflater; private ImageLoader mImageLoader; private String mCategoryId; private View mEmptyView; private final List<ArticlePreview> mArticlePreviewList; public CategoryArticlesListAdapter(String theCategoryId, DrupalClient theClient, Context theContext, View emptyView) { mEmptyView = emptyView; mArticlePreviewList = new ArrayList<ArticlePreview>(); mInflater = LayoutInflater.from(theContext); mDrupalClient = theClient; setCanLoadMore(true); mCategoryId = theCategoryId; initImageLoader(theContext); loadNextPage(); } private void initImageLoader(Context theContext) { RequestQueue queue = Volley.newRequestQueue(theContext); mImageLoader = new ImageLoader(queue, new ImageCache() { @Override public void putBitmap(String url, Bitmap bitmap) { } @Override public Bitmap getBitmap(String url) { return null; } }); } @Override public int getCount() { return mArticlePreviewList.size(); } @Override public ArticlePreview getItem(int position) { return mArticlePreviewList.get(position); } @Override public long getItemId(int position) { return position; } public void setCanLoadMore(boolean canLoadMore) { mCanLoadMore = canLoadMore; if (!mCanLoadMore && mArticlePreviewList.isEmpty()) { mEmptyView.setVisibility(View.VISIBLE); } else { mEmptyView.setVisibility(View.INVISIBLE); } } @Override public View getView(int position, View convertView, ViewGroup parent) { if (position > mArticlePreviewList.size() - PRE_LOADING_PAGE_OFFSET) { loadNextPage(); } if (convertView == null) { convertView = mInflater.inflate(R.layout.list_item_article, null); } ArticlePreview item = mArticlePreviewList.get(position); if (item != null) { TextView title = (TextView) convertView.findViewById(R.id.title); title.setText(Html.fromHtml(item.getTitle()).toString()); TextView author = (TextView) convertView.findViewById(R.id.author); View byView = convertView.findViewById(R.id.by); String authorName = item.getAuthor(); if (authorName != null && !authorName.isEmpty()) { author.setText(authorName); byView.setVisibility(View.VISIBLE); author.setVisibility(View.VISIBLE); } else { byView.setVisibility(View.INVISIBLE); author.setVisibility(View.INVISIBLE); } TextView date = (TextView) convertView.findViewById(R.id.date); date.setText(item.getDate()); TextView description = (TextView) convertView.findViewById(R.id.description); description.setText(Html.fromHtml(item.getBody())); NetworkImageView imageView = (NetworkImageView) convertView.findViewById(R.id.image); imageView.setImageUrl(item.getImage(), mImageLoader); } return convertView; } private void loadNextPage() { if (mCanLoadMore && mArticlePreviews == null) { mArticlePreviews = new Page(mDrupalClient, mPagesLoaded, mCategoryId); mArticlePreviews.pullFromServer(false, null, this); } } @Override public void onRequestCompleted(AbstractBaseDrupalEntity entity, Object tag, ResponseData data) { if (!mArticlePreviews.isEmpty()) { mArticlePreviewList.addAll(mArticlePreviews); mArticlePreviews = null; mPagesLoaded++; notifyDataSetChanged(); } else { setCanLoadMore(false); } } @Override public void onRequestFailed(AbstractBaseDrupalEntity entity, Object tag, VolleyError error) { setCanLoadMore(false); } @Override public void onRequestCanceled(AbstractBaseDrupalEntity entity, Object tag) { } }