[android-developers] Re: URGENT : HELP NEEDED ! Loading Bitmap Image into Custom ListView using AsyncTask

Hi,

Do you eventually see the bitmap in imageView, after it is loaded from the network ?

See the definitive example from Romain Guy -  http://code.google.com/p/shelves/ 

And discussed here - http://www.curious-creature.org/2009/03/04/speed-up-your-android-ui/

Also no need to say a post is URGENT, we assume all posts are urgent anyway.

Regards

On Tuesday, July 24, 2012 9:44:30 AM UTC+10, Raghav Shankar wrote:

I am working on an android application that has a custom listview that contains an imageview and a textview. I am loading an image from the internet and converting it into a bitmap image. I am doing this using an async task.  I am trying to display the bitmap in the imageview. When the activity starts I am only able to see a black screen and I don't see any listview. I would appreciate any help. Here is my code: 

 public class CustomList {

public Bitmap icon;

    public String title;

    public CustomList(){

        super();

    }

    

    public CustomList(Bitmap icon, String title) {

        super();

        this.icon = icon;

        this.title = title;

    }

}

Here is my adapter class: 

public class CustomListAdapter extends ArrayAdapter<CustomList> {

Context context;

int layoutResourceId;

LinkedList<CustomList> data = new LinkedList<CustomList>();

public CustomListAdapter(Context context, int layoutResourceId,

LinkedList<CustomList> data) {

super(context, layoutResourceId, data);

// TODO Auto-generated constructor stub

this.context = context;

this.layoutResourceId = layoutResourceId;

this.data = data;

}

@Override

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

// TODO Auto-generated method stub

View row = convertView;

CustomListHolder holder = null;

if(row == null){

LayoutInflater inflater = ((Activity)context).getLayoutInflater();

            row = inflater.inflate(layoutResourceId, parent, false);

            holder = new CustomListHolder();

     holder.text = (TextView)row.findViewById(R.id.txtTitle);

     holder.thumbnail = (ImageView)row.findViewById(R.id.imgIcon);

     row.setTag(holder);

}

else

holder = (CustomListHolder)row.getTag();

CustomList cl = data.get(position);

        holder.text.setText(cl.title);

        if(cl.icon != null)

        holder.thumbnail.setImageBitmap(cl.icon);

        

return row;

}

static class CustomListHolder

    {

        ImageView thumbnail;

        TextView text;

    }

}

Here is my main activity and it has an async class as a sub class: 

public class MainActivity extends Activity {

LinkedList<CustomList> list_data = new LinkedList<CustomList>();

LinkedList<String> photo_url = new LinkedList<String>();

LinkedList<String> list_title = new LinkedList<String>();

ListView lv ;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.list_main);

        photo_url.add(0,"http://java.sogeti.nl/JavaBlog/wp-content/uploads/2009/04/android_icon_256.png");

        list_title.add(0, "Android");

        LoadImage eventImageLoader = new LoadImage(MainActivity.this, photo_url, list_title);

        eventImageLoader.execute();

        

        CustomListAdapter adapter = new CustomListAdapter(this,R.layout.list_item, list_data);

    lv = (ListView)findViewById(R.id.listView1);

    lv.setAdapter(adapter);

      

    }

       

    public class LoadImage extends AsyncTask<Void, Void, LinkedList<CustomList>>{

     Context callingContext = null;

     LinkedList<String> pic_url = new LinkedList<String>();

     LinkedList<String> title = new LinkedList<String>();

     Bitmap b = null;

     LinkedList<Bitmap> bm = new LinkedList<Bitmap>();

    

     public LoadImage(Context callingContext, LinkedList<String> pic_url, LinkedList<String> title){

    

     this.callingContext = callingContext;

     this.pic_url = pic_url;

     this.title = title;

     }

    

@Override

protected LinkedList<CustomList> doInBackground(Void... params) {

// TODO Auto-generated method stub

URL imageUrl;

CustomList temp;

for(int i = 0; i < pic_url.size(); i++)

        {           

try {

imageUrl = new URL(pic_url.get(i));

temp = new CustomList(BitmapFactory.decodeStream(imageUrl.openConnection().getInputStream()),title.get(i));

list_data.add(i,temp);

System.out.println("Added" + i + "th Value");

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}             

        }

return list_data;

}

    

protected void onPostExecute(LinkedList<CustomList> bm) {

// TODO Auto-generated method stub

super.onPostExecute(bm);

}

    }   

}

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