Android handling big images

Question

I let the user choose a background and the user can pick their own pictures from gallery or pictures from the list I bring with the app. I save this picture to FileOutputStream. However, my application gets really slow, I am using the following functions;

//When user picks from gallery
public void save(Bitmap bitmapImage) {
    bitmapImage = scaleBitmap(bitmapImage);

    FileOutputStream fileOutputStream = null;
    try {
        fileOutputStream = new FileOutputStream(createFile());
        bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (fileOutputStream != null) {
                fileOutputStream.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

//When user picks from list and I load from drawables
public void save(int resId) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = IMAGE_IN_SAMPLE_SIZE;
    options.inScaled = false;
    options.inJustDecodeBounds = false;

    Bitmap bitmapImage = BitmapFactory.decodeResource(context.getResources(), resId, options);

    FileOutputStream fileOutputStream = null;
    try {
        fileOutputStream = new FileOutputStream(createFile());
        bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (fileOutputStream != null) {
                fileOutputStream.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

How can I make those functions faster?

I also get this messages:

06-15 12:02:58.884 22320-22320/com I/dalvikvm-heap: Grow heap (frag case) to 15.172MB for 2073616-byte allocation
06-15 12:03:00.716 22320-22320/com I/dalvikvm-heap: Grow heap (frag case) to 15.149MB for 2073616-byte allocation
06-15 12:03:03.129 22320-22320/com I/Choreographer: Skipped 145 frames!  The application may be doing too much work on its main thread.

Possible duplicate of [The application may be doing too much work on its main thread](https://stackoverflow.com/questions/14678593/the-application-may-be-doing-too-much-work-on-its-main-thread) — user3802077, Jun 15 '17 at 10:28
I want to use glide, but how can I save a image with glide to a File? — tomhogenkamp, Jun 15 '17 at 11:05

Lewis · Answer 1 · 2017-06-18T12:17:37.357

0

U should not do must IO work in main thread，maybe you can do it int a Thread, and update your ui by hanlder.

  new Thread(new Runnable() {
        @Override
        public void run() {
            // save your picture
            handler.sendEmptyMessage(0);
        }
    }).start();

And it is better to use rxjava and rxAndroid.

Hope it can help you

edited Jun 18 '17 at 12:17

answered Jun 15 '17 at 10:41

Lewis

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score 0 · Answer 2 · answered Jun 15 '17 at 10:51

If the image is too big working on another thread will not help , it will still cause OutOfMemory ,

You should try using Glide library to do your thing they implement it in the best way

This link for Glide\Picasso installment and basic use-

https://inthecheesefactory.com/blog/get-to-know-glide-recommended-by-google/en

For scaling-

https://futurestud.io/tutorials/glide-image-resizing-scaling

Android handling big images

2 Answers2