com.imobilize.blogposts.articles.ArticlesManager.java Source code

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Here is the source code for com.imobilize.blogposts.articles.ArticlesManager.java

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/**
* Copyright 2014 iMobilize Ltd.
*
* 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.imobilize.blogposts.articles;

import org.json.JSONArray;

import android.content.Context;
import android.content.Intent;
//import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

import com.android.volley.Response;
import com.android.volley.Response.Listener;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.imobilize.blogposts.activities.ArticleActivity;
import com.imobilize.blogposts.adapters.ArticlesArrayAdapter;
import com.imobilize.blogposts.adapters.ArticlesArrayAdapter.ViewHolder;
import com.imobilize.blogposts.constants.Constants;
import com.imobilize.blogposts.json.ApplicationController;

public class ArticlesManager {

    private static ArticlesManager articleManagerInstance;

    public static ArticlesManager getInstance() {
        if (articleManagerInstance == null) {
            articleManagerInstance = new ArticlesManager();
        }
        return articleManagerInstance;
    }

    public <T> void loadArticlesTo(Context articlesContext, ListView articlesListView, String selectedCategory) {
        String urlJsonData = Constants.blogHostAndPort + "articlesToJson?category=" + selectedCategory;
        JsonArrayRequest articlesJsonRequest = new JsonArrayRequest(urlJsonData,
                listener(articlesContext, articlesListView), errorListener());
        ApplicationController.getInstance().addToRequestQueue(articlesJsonRequest);
    }

    private Listener<JSONArray> listener(final Context articlesContext, final ListView articlesListView) {
        return new Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray response) {
                articlesListView.setAdapter(new ArticlesArrayAdapter(articlesContext, response));
            }
        };
    }

    private Response.ErrorListener errorListener() {
        return new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
            }
        };
    }

    public OnItemClickListener onArticleClickListener(final Context articlesContext) {
        return new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                ViewHolder holder = (ViewHolder) view.getTag();
                if (holder.getArticleTitle() != null) {
                    loadSingleArticleTo(articlesContext, holder);
                }
            }
        };
    }

    private <T> void loadSingleArticleTo(Context context, ViewHolder holder) {
        Intent intentForArticleActivity = new Intent(context, ArticleActivity.class);
        intentForArticleActivity.putExtra(Constants.ARTICLE_TITLE, holder.getArticleTitle().getText());
        intentForArticleActivity.putExtra(Constants.ARTICLE_METADATA, holder.getArticleMetadata().getText());
        intentForArticleActivity.putExtra(Constants.ARTICLE_CONTENT, holder.getArticleContent());
        intentForArticleActivity.putExtra(Constants.ARTICLE_KEY, holder.getArticleKey());
        context.startActivity(intentForArticleActivity);
    }

}