Async loading of images in a CustomListView from MediaFiles

Question

I am developing a music app and my app takes a lot of time to generate the list of music files(because it has to generate the bitmaps) so I searched the net and came to know about the asynctask, I was able to implement it successfully in one another problem I had (so I think I understand the logic behind it) but in this case I just cant figure a way how to do it,(

Custom Adapter is confusing me a bit,i am wondering where should i do the tasks a- synchronously ,while i am generating the list or whether in the custom adapter where i am displaying the list i have generated )

so please I need help. here is the logic behind the program

I have a class "SongDetails" which has the following elements

Bitmap icon;
String song;
String Artist;
String Album;
String Path;

I have created an arraylist of SongDetails now I have another class called getSongsFromDirectory which searches for music files, fetches album and artist info from it, and adds the each item to the ArrayList and when the list is generated it returns the list to the onCreate method.Now onCreate method sorts the list by name of the songs and then gives the list to the custom adapter which displays the result,I can't understand where I should put this async task thing...........here is the code I have used

public class FragmentSongs extends  Fragment implements Serializable  {

    
    


    AdapterView.AdapterContextMenuInfo info;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) 
    {
              
       
       
       
       
        View view = inflater.inflate(R.layout.fragment_song, container, false);
                ListView SngList = (ListView) view.findViewById(R.id.SongList);
        registerForContextMenu(SngList);
        //File f=new File(Environment.getExternalStorageDirectory()+"Music");
        //File f=new File("/sdcard/Music");
        File f=new File(Environment.getExternalStorageDirectory()+"musicz");
        //File f=new File("/storage/extSdCard/My Music/");
        int j=0;int i=0;
        
        getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

         final ArrayList Songinfo = getSongsFromDirectory(f);
         FragmentSongs dv=new  FragmentSongs ();
         if (Songinfo.size()>0)
        {
         Bundle bundle = new Bundle();
        
         bundle.putParcelableArrayList("Fragdata",Songinfo);
         dv.setArguments(bundle);
         
        }
         
         
         
        
        
        if (Songinfo.size()>0)
        {
            
            for( j=0; j getSongsFromDirectory(File f)
        {MediaMetadataRetriever mmr = new MediaMetadataRetriever();
        
            ArrayList songs = new ArrayList();
            Bitmap bitmap2; 
            Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ab);

            float ht_px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, getResources().getDisplayMetrics());
            float wt_px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, getResources().getDisplayMetrics());
            
            Bitmap bitmap3 = Bitmap.createScaledBitmap(bmp, (int) ht_px, (int) wt_px, true);
            byte[] rawArt = null;
            Bitmap art;
            BitmapFactory.Options bfo=new BitmapFactory.Options();
            if (!f.exists() || !f.isDirectory()) 
            {    
                return songs;
            }
            File[] files = f.listFiles(new Mp3Filter());
            for(int i=0; i


now here is the code for the adapter
public class CustomAdapter extends BaseAdapter {

    private ArrayList _data;

    CustomAdapter (ArrayList data){
        _data = data;
    }

    public int getCount() {

        return _data.size();
    }

    public Object getItem(int position) {

        return _data.get(position);
    }

    public long getItemId(int position) {

        return position;
    }

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

        Context context = parent.getContext();
        View v = convertView;

        if (v == null) {
           v = LayoutInflater.from(context).inflate(R.layout.list_item, parent, false);
        }
        SongDetails sng = _data.get(position);
        ImageView image = (ImageView) v.findViewById(R.id.icon);
        ImageView image2 = (ImageView) v.findViewById(R.id.icon);
        TextView SongView = (TextView)v.findViewById(R.id.Song);
        TextView AlbumView = (TextView)v.findViewById(R.id.Album);
        TextView ArtistView = (TextView)v.findViewById(R.id.Artist);
       /*ImageLoaderConfiguration config=new ImageLoaderConfiguration.Builder(context).build();
        ImageLoader imageloader=ImageLoader.getInstance();  
        imageloader.init(config);
        imageloader.displayImage( null, image2);
       */

        image.setImageBitmap(sng.icon);
        image2.setBackgroundResource(sng.icLauncher);
        SongView.setText(sng.song);
        AlbumView.setText(sng.Album);
        ArtistView.setText(sng.Artist);

        return v;
    }
}

Async loading of images in a CustomListView from MediaFiles

Custom Adapter is confusing me a bit,i am wondering where should i do the tasks a- synchronously ,while i am generating the list or whether in the custom adapter where i am displaying the list i have generated )

Answers (1)

Related Questions