JsonListAdapter.java

/*
 Swisscom Safe Connect
 Copyright (C) 2014 Swisscom

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package com.swisscom.safeconnect.adapter;

import java.util.LinkedList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.text.method.LinkMovementMethod;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

import com.swisscom.safeconnect.R;
import com.swisscom.safeconnect.json.ResourceJsonParser;

/**
 * class that shows faq and other similar stuff
 * @author Vadym Uvin
 */
public class JsonListAdapter extends BaseExpandableListAdapter {
	private Context context;
	private List<ResourceJsonParser.Elem> list = new LinkedList<ResourceJsonParser.Elem>();
	
	/**
	 * @param rawResId id of the json under res/raw folder
	 */
	public JsonListAdapter(Context context, int rawResId) {
		this.context = context;
		
		// parse json
		list = new ResourceJsonParser(context, rawResId).getListResult();
	}
	
	@Override
	public int getGroupCount() {
		return list.size();
	}
	
	@Override
	public int getChildrenCount(int groupPosition) {
		return 1;
	}
	
	@Override
	public Object getGroup(int groupPosition) {
		return list.get(groupPosition);
	}
	
	@Override
	public Object getChild(int groupPosition, int childPosition) {
		return list.get(groupPosition);
	}
	
	@Override
	public long getGroupId(int groupPosition) {
		return groupPosition;
	}
	
	@Override
	public long getChildId(int groupPosition, int childPosition) {
		return childPosition;
	}
	
	@Override
    public boolean hasStableIds() {
        return true;
    }
	
	/**
	 * to avoid instantiation of objects due to list scrolling, we use this class
	 * @author Vadym Uvin
	 *
	 */
	static class ViewHolder {
		TextView text;
		TextView descr;
	}
	
	@Override
	public View getGroupView(int groupPosition, boolean isExpanded,
			View convertView, ViewGroup parent) {
		ResourceJsonParser.Elem elem = list.get(groupPosition);
		View rowView = convertView;

		// helps to reuse objects and avoid allocating a memory
		if (rowView == null) {
			LayoutInflater inflater = ((Activity) context).getLayoutInflater();
			rowView = inflater.inflate(R.layout.list_row_faq_header, parent, false);
			
			ViewHolder h = new ViewHolder();
			h.text = (TextView) rowView.findViewById(R.id.item_text);
			rowView.setTag(h);
		}

		ViewHolder h = (ViewHolder) rowView.getTag();

		h.text.setText(elem.title);
		
		return rowView;
	}
	
	@Override
	public View getChildView(int groupPosition, int childPosition,
			boolean isLastChild, View convertView, ViewGroup parent) {
		ResourceJsonParser.Elem elem = (ResourceJsonParser.Elem) getChild(groupPosition, childPosition);
		View rowView = convertView;

		// helps to reuse objects and avoid allocating a memory
		if (rowView == null) {
			LayoutInflater inflater = ((Activity) context).getLayoutInflater();
			rowView = inflater.inflate(R.layout.list_row_faq_content, parent, false);
			
			ViewHolder h = new ViewHolder();
			h.text = (TextView) rowView.findViewById(R.id.item_text);
			// ensures clickable hyperlinks
			h.text.setMovementMethod(LinkMovementMethod.getInstance());
			rowView.setTag(h);
		}

		ViewHolder h = (ViewHolder) rowView.getTag();

		h.text.setText(elem.content);
		
		return rowView;
	}

	@Override
	public boolean isChildSelectable(int groupPosition, int childPosition) {
		return false;
	}
}