Loading images in ImageView from a url

Question

I found this snippet on the internet:

try{
        URL url = new URL(imgUrl+imageId[position]+".png");
        HttpURLConnection con = (HttpURLConnection)url.openConnection();
        InputStream is = con.getInputStream();
        Bitmap bmp = BitmapFactory.decodeStream(is);
        imageView.setImageBitmap(bmp);
    }catch(Exception e) {
        System.out.println(e.getMessage());
    }

The code doesn't give me any errors,I am getting the exact url I want. But the ImageView stays empty. Running the debugger I got no problem upto: InputStream is = con.getInputStream(); After this the debugger goes to the catch block, and debugger window shows

NetworkOnMainThreadException

I know it's because I am doing network operations on the UI thread , but my activity already is extending another class, so I can't extend AsycnTask. Any workaround for this?

Plus: If there is an exception, shouldn't the app crash? My app runs fine, but the imageview doesn't show anything.

Try this Android : Loading an image from the Web with Asynctask http://stackoverflow.com/a/3090802/4826114 — eddykordo, Jul 03 '15 at 11:58
Your class dont need to extend AsyncTask, create a class which extends AyncTask<...> the in doInBackground(...) of that write your code. — silentsudo, Jul 03 '15 at 12:00

score 1 · Answer 1 · answered Jul 03 '15 at 11:49

1

Newer versions of Android requires you to make HTTP requests (networking) on a separate thread. You can create a separate Thread, or use AsyncTask for this. The same code should work after you do this.

answered Jul 03 '15 at 11:49

tcak

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score 1 · Accepted Answer · answered Jul 03 '15 at 11:50

1

You can use Picasso that will help you also in async thread:

Picasso.with(context).load(imgUrl+imageId[position]+".png").into(imageView);

You can download the source here: http://square.github.io/picasso/ or add it as dependency directly from Android Studio

answered Jul 03 '15 at 11:50

Giorgio Antonioli

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will this line of code ensure the image loading is done in a separate thread? – Aman Grover Jul 03 '15 at 11:59
yes , picasso handle all background threads – eddykordo Jul 03 '15 at 12:01
@AmanGrover Absolutely yes. – Giorgio Antonioli Jul 03 '15 at 12:02
Yes. Picasso handles image loading for you in separated thread and resize the result (to get rid of OutOfMemory exception) then set the bitmap to your ImageView on UIThread – Nguyễn Hoài Nam Jul 03 '15 at 12:02

Loading images in ImageView from a url

2 Answers2