TopicsAdapter.java

package com.kanshu.kanshu;

/**
 * Created by alouanemed on 22-01-2015.
 */

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.kanshu.kanshu.controller.TopicsController;
import com.kanshu.kanshu.model.Topic;
import com.squareup.picasso.Picasso;

import java.util.ArrayList;

public class TopicsAdapter extends BaseAdapter {
    private ArrayList<Topic> mTopicsList;
    private Activity activity;
    private final Typeface tf;
    TopicsController mTopicsController;

    public TopicsAdapter(Activity context,
                         ArrayList<Topic> mTopicsList, Typeface tfBold,
                         TopicsController mTopicsController) {
        super();
        this.mTopicsList = mTopicsList;
        activity = context;
        this.tf = tfBold;
        this.mTopicsController = mTopicsController;

    }


    public static class ViewHolder {

        public TextView tvTopicTitle;
        public ImageView IvTopicImg;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View v = convertView;
        ViewHolder holder;
        if (v == null) {
            LayoutInflater vi =
                    (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(R.layout.topic_card, null);

            holder = new ViewHolder();

            holder.tvTopicTitle = (TextView) v.findViewById(R.id.topicTitle);
            holder.IvTopicImg = (ImageView) v.findViewById(R.id.topic_image);

            v.setTag(holder);
        } else holder = (ViewHolder) v.getTag();

        if (!TextUtils.isEmpty(mTopicsList.get(position).getTitle())) {
            holder.tvTopicTitle.setText(mTopicsList.get(position).getTitle());
            holder.tvTopicTitle.setTypeface(tf);
        } else {
            holder.tvTopicTitle.setVisibility(View.GONE);
        }

        if (!TextUtils.isEmpty(mTopicsList.get(position).getImgURL())) {
            //we will use drawable .. for now
            String mImg_url = mTopicsList.get(position).getImgURL();
            if (mImg_url.endsWith("_updated")){
                String helper_str  =mImg_url.substring(0,mImg_url.length()-8);

                int id = activity.getResources().getIdentifier((helper_str
                ), "drawable", activity.getPackageName());
                Drawable Dra = activity.getResources().getDrawable(id);
                holder.IvTopicImg.setImageDrawable(Dra);
                //Picasso.with(activity).load(id).into(holder.IvTopicImg);
            }else{
                Bitmap mTopic_bmp = mTopicsController.toGrayscale(mTopicsList.get(position).getImgURL());
                holder.IvTopicImg.setImageBitmap(mTopic_bmp);
            }
        } else {
            Picasso.with(activity).load(R.drawable.kanshu_gray).into(holder.IvTopicImg);
        }
        return v;
    }

    @Override
    public int getCount() {
        return mTopicsList == null ? 0 : mTopicsList.size();
    }

    @Override
    public Object getItem(int position) {
        return mTopicsList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }
}