V. 2

CollectionListAdapter.java

package com.ap.wificam.collection;

import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.ThumbnailUtils;
import android.os.AsyncTask;
import android.os.Environment;
import android.preference.PreferenceManager;
import android.util.Log;
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.ap.wificam.R;
import com.ap.wificam.model.Collection;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.ArrayList;

import static android.graphics.BitmapFactory.decodeFile;

/**
 * Created by AND1 on 07.03.14.
 */
public class CollectionListAdapter extends BaseAdapter {

    private Context context;
    private ArrayList<Collection> collectionList;
    private int activeCollectionId;
    private File SDCardRoot = Environment.getExternalStorageDirectory();
    private SharedPreferences prefs;
    private String savePath;

    private String[] imagePaths;

    public CollectionListAdapter(Context context, ArrayList<Collection> collectionList, int activeCollectionId) {
        this.context = context;
        this.collectionList = collectionList;
        this.activeCollectionId = activeCollectionId;

        prefs = PreferenceManager.getDefaultSharedPreferences(context);
        savePath =  prefs.getString("folder_name_text", "default_no");
    }

    @Override
    public int getCount() {
        return collectionList.size();
    }

    @Override
    public Object getItem(int i) {
        return collectionList.get(i);
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        Collection collection = collectionList.get(i);

        Log.d("and1", "element : " + i);
        ViewHolder holder;

        if(view == null){
            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.item_collection_row, null);
            holder = new ViewHolder();
            holder.name = (TextView) view.findViewById(R.id.textViewName);
            holder.date = (TextView) view.findViewById(R.id.textViewDate);
            holder.location = (TextView) view.findViewById(R.id.textViewLocation);
            holder.active = (TextView) view.findViewById(R.id.textViewActiveCollection);
            holder.count = (TextView) view.findViewById(R.id.textViewImageCount);
            holder.imageView[0] = (ImageView) view.findViewById(R.id.imageViewThumb0);
            holder.imageView[1] = (ImageView) view.findViewById(R.id.imageViewThumb1);
            holder.imageView[2] = (ImageView) view.findViewById(R.id.imageViewThumb2);
            holder.imageView[3] = (ImageView) view.findViewById(R.id.imageViewThumb3);
            holder.position = i;
            view.setTag(holder);
            Log.d("and1", "holder if");
        }
        else{
            holder = (ViewHolder) view.getTag();
            Log.d("and1", "holder else");
        }

        holder.name.setText(collection.getName());
        holder.date.setText(collection.getDate());
        holder.location.setText(collection.getLocation());
        holder.count.setText(String.valueOf(getImageCount((int) collection.getId())));
        new ThumbnailTask(i, holder).execute(imagePaths);

        //highlighten um active collection vorzuheben
        if( ((int)collection.getId()) == activeCollectionId){
            holder.active.setVisibility(View.VISIBLE);
            view.setBackgroundColor(context.getResources().getColor(R.color.bg_gray_highlight));
        }
        else{
            holder.active.setVisibility(View.INVISIBLE);
            view.setBackgroundColor(0x00000000);
        }

        return view;
    }

    private int getImageCount(int collectionId){

        String folderPath = SDCardRoot.getAbsolutePath() + savePath + collectionId + "/"; //TODO single var file path
        imagePaths = getFilePaths(folderPath);
        File collectionFolder = new File(folderPath);
        int imageCount = 0;
        if(collectionFolder.exists())
            imageCount = collectionFolder.list().length;
        return imageCount;
    }

    private class ThumbnailTask extends AsyncTask<String, Void, Bitmap[]> {

        private ViewHolder viewHolder;
        private Bitmap thumb[] = new Bitmap[4];
        private int position;

        public ThumbnailTask(int position, ViewHolder holder){
            super();
            this.position = position;
            this.viewHolder = holder;
        }

        @Override
        protected Bitmap[] doInBackground(String... args) {
            //Lade Die Bilder als Bitmap wenn welche existieren
            File imageFile;
            File thumbFile;

            int j = args.length;
            if (j >4) j=4;

            for(int i=0; i<j; i++){
                imageFile = new File(args[i]);
                thumbFile = new File(context.getFilesDir().getAbsolutePath() + "/thumbs/" + imageFile.getName());
                if(!thumbFile.exists()){
                    thumb[i] = createThumb(args[i]);
                }
                else{
                    thumb[i] = BitmapFactory.decodeFile(thumbFile.getAbsolutePath());
                }
            }
            return null;
        }

        @Override
        protected void onPostExecute(Bitmap[] result) {

            if(viewHolder.position == this.position) {
                for (int i = 0; i < 4; i++) {
                    if(thumb[i] != null)
                        viewHolder.imageView[i].setImageBitmap(thumb[i]);
                    else
                        viewHolder.imageView[i].setImageResource(R.drawable.ic_action_new);
                }
            }

        }

        @Override
        protected void onPreExecute() {}

        @Override
        protected void onProgressUpdate(Void... values) {}

        public Bitmap createThumb(String filePath){
            File imageFile = new File(filePath);
            File thumbFile = new File(context.getFilesDir().getAbsolutePath() + "/thumbs/" + imageFile.getName());
            Bitmap thumbX = ThumbnailUtils.extractThumbnail(decodeFile(filePath), 200, 200);
            //saveThumb(thumb, thumbFile);

            return thumbX;
        }

        //TODO
        public void saveThumb(Bitmap thumb, File thumbFile) {

            FileOutputStream out = null;
            try {
                out = new FileOutputStream(thumbFile.getAbsolutePath());
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            thumb.compress(Bitmap.CompressFormat.JPEG, 85, out);
        }

        //TODO
        public void loadThumb(String filePath){

        }

    }

    public class ViewHolder
    {
        public ImageView imageView[] = new ImageView[4];
        public TextView date, location, name, active, count;
        public int position;

    }

    public String[] getFilePaths(String folderPath){
           [...]
    }

}