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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