Downloading images with multiple Threads causes an OutOfMemory Exception

Question

I'm retrieve the String of image name and having to download bitmap from server For getting String of image name fron JSON data and download using this link :

String str_ImgURL_bmp_pattern = "http://xxxx/xxx/MobileService.svc/DownloadFile/FileName/" + imageName; download_PngFile(str_ImgURL_bmp_pattern);

void download_PngFile(String fileUrl) {
        Log.e("In download_PngFile ", " str_imgList_imageaudioPath = " + imageName);
        Bitmap imagenObtenida = null;
        try {
            URL ImgUrl = new URL(fileUrl);
            HttpURLConnection conn = (HttpURLConnection) ImgUrl.openConnection();
            conn.connect();
            imagenObtenida = BitmapFactory.decodeStream(conn.getInputStream());
            //Log.e("imagenObtenida", " = " + imagenObtenida);

            String fotoname = imageName;
            File file = new File(newFolder, fotoname);
            int sizeOfImage = (int) file.length();
            Log.e("sizeOfImage ", " = " + sizeOfImage + "@ " + imageName);
            if (file.exists()) file.delete();
            try {
                FileOutputStream out = new FileOutputStream(file);
                imagenObtenida.compress(Bitmap.CompressFormat.PNG, 100, out);
                out.flush();
                out.close();
               // Log.e("Png = ", "DownLoad complete");

            } catch (Exception e) {

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

But this some images are download and after sometime app crashes and I get the error in the title in logcat.

java.lang.RuntimeException: An error occured while executing doInBackground()
            at android.os.AsyncTask$3.done(AsyncTask.java:278)
            at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
            at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
            at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
            at java.util.concurrent.FutureTask.run(FutureTask.java:137)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
            at java.lang.Thread.run(Thread.java:856)
     Caused by: java.lang.OutOfMemoryError
            at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
            at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:493)
            at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:549)
            at com.example.tazeen.classnkk.AllPosts_Page.download_PngFile(AllPosts_Page.java:896)
            at com.example.tazeen.classnkk.AllPosts_Page.getDoenLoaddata(AllPosts_Page.java:820)
            at com.example.tazeen.classnkk.AllPosts_Page$GetgetAllImagePath_List.doInBackground(AllPosts_Page.java:781)
            at com.example.tazeen.classnkk.AllPosts_Page$GetgetAllImagePath_List.doInBackground(AllPosts_Page.java:771)
            at android.os.AsyncTask$2.call(AsyncTask.java:264)
            at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
            at java.util.concurrent.FutureTask.run(FutureTask.java:137)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
            at java.lang.Thread.run(Thread.java:856)

The error at this line :imagenObtenida = BitmapFactory.decodeStream(conn.getInputStream());

How to resolve this issues.

Try referring this [answer][1].This might help you. [1]: http://stackoverflow.com/questions/14051068/java-lang-outofmemoryerror-in-android-while-getting-image-from-gallery-in-androi — Jas, Sep 23 '15 at 04:58

daemmie · Accepted Answer · 2015-09-23T06:14:48.147

So basically the exception is pretty clear. You are out of memory.

There are some possible solutions:

1. Scale down your images:

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
Bitmap imagenObtenida = BitmapFactory.decodeStream(conn.getInputStream(), null, options);

This is required, if even a single image download causes a crash.

2. Don't decode at the same time

So don't use a ThreadPoolExecutor

3. Combinations For example:

-just use 2 parallel Threads

-check the available memory and set a thread number which fits to the current memory

-catch out of memory exceptions and wait till other thread finish

Downloading images with multiple Threads causes an OutOfMemory Exception

1 Answers1