lazy loading in android works only on emulator?

Question

I have been trying to implement Lazy Loading of images in Android. I have followed this excellent tutorial here: http://www.androidhive.info/2012/02/android-custom-listview-with-image-and-text/

The problem is it works perfectly fine in the emulator. In emulator the images load up but on real devices they just display the default image.

I have tested it on 6 android devices with no luck but they load perfectly on Emulator.

Any ideas on where i am going wrong?

Thanks in advance guys!

Edit: I have modified the code to use JSON Parsing rather than XML Parsing, if that matters.

My Lazy Adapter class:

public class LazyAdapter extends BaseAdapter {

private Activity activity;
private ArrayList<HashMap<String, String>> data;
private static LayoutInflater inflater=null;
public ImageLoader imageLoader; 

public LazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
    activity = a;
    data=d;
    inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    imageLoader=new ImageLoader(activity.getApplicationContext());
   // Toast.makeText(a, "here too", 500).show();
}

public int getCount() {
    return data.size();
}

public Object getItem(int position) {
    return position;
}

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

public View getView(int position, View convertView, ViewGroup parent) {
    View vi=convertView;
    if(convertView==null)
        vi = inflater.inflate(R.layout.list_row, null);

    TextView title = (TextView)vi.findViewById(R.id.title); // title
    ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image

    HashMap<String, String> song = new HashMap<String, String>();
    song = data.get(position);

    // Setting all values in listview
    title.setText(song.get("msg"));

    imageLoader.DisplayImage(song.get("thumb"), thumb_image);
    return vi;
}
}

Nope bro, on emulator its working perfectly without any problems, but when i try on a real device it fails :( — Adnan Mulla
– Adnan Mulla, Commented Oct 26, 2012 at 17:14
I would say to post your LazyAdapter class so we can take a look. Not much else to go off of otherwise. You can try and execute some logging in the app for when it is on the device. Download a LogCat app and check to see if anything throws an error on the device.. — burmat
– burmat, Commented Oct 26, 2012 at 17:16

Stipe · Accepted Answer · 2012-11-05 07:57:57Z

3

If you use this solution

https://github.com/thest1/LazyList

you need to add

android.permission.WRITE_EXTERNAL_STORAGE

in android manifest

answered Nov 5, 2012 at 7:57

Stipe

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1 Comment

Adnan Mulla Over a year ago

This was the error, apparently the tutorial i was using also needed that permission & i totally forgot to see it !! Thanks a ton for pointing it out ! Weird though emulator loaded thumbs without that permission :P

AndroidLearner · Accepted Answer · 2012-10-30 09:13:39Z

3

Put this line in your code and try it ...

thumb_image.setTag(song.get("thumb"));
imageLoader.DisplayImage(song.get("thumb"), thumb_image);

answered Oct 30, 2012 at 9:13

AndroidLearner

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Comments

thepoosh · Accepted Answer · 2012-10-30 09:19:04Z

1

the best answer I can give you is: "use other better implementations of lazy loading" such as fedorvlasov's lazy list adapter.

answered Oct 30, 2012 at 9:19

thepoosh

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Salahi Halil Altıncı · Accepted Answer · 2013-04-16 18:39:41Z

0

This is going to be a late answer but some can benefit. The tutorial you referenced is working very well on emulator and phones.

I think problem here was a permission issue.

if you dont put the following line to your manifest file, it works on Emulator but not on Phones.

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

answered Apr 16, 2013 at 18:39

Salahi Halil Altıncı

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