CODEWITHSUNDEEP
javaandroidimagebitmaptake
DoD
DoD

Reputation: 1

How to take multiple images and still keep the quality on Android java using ImageReader?

I am trying to take multiple images on Android java using ImageReader. It's working fine if the user only takes a single image. But if they take multiple images at the same time (click the button continuously for a short duration) the images will be pixelated and unable to use.

Below you can see the result. If I took a single image

single image

If I took multiple images

multiple images

I'm using bitmate to take the image.

byte[] imageData = ImageUtils.NV21toJPEG(ImageUtils.YUV420toNV21(image), image.getWidth(), image.getHeight(), 100);
Bitmap bitmapImage = BitmapFactory.decodeByteArray(imageData, 0, imageData.length, null);

transform the bitmap into image

public static File bitmapToFile(Bitmap bitmap, String fileNameToSave, Context context) {
    File file = null;
    try {
        file = new File(context.getExternalCacheDir() + File.separator + fileNameToSave);
        file.createNewFile();

        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
        byte[] bitmapdata = bos.toByteArray();

        FileOutputStream fos = new FileOutputStream(file);
        fos.write(bitmapdata);
        fos.flush();
        fos.close();
        return file;
    } catch (Exception e) {
        e.printStackTrace();
        return file; // it will return null
    }

The reason I can think of is. When the user click the button multiple time, the image couldn't finish the process fast enough so the image got pixelated. I try to add a sleeping thread and also disable the button, but it takes so long for the image to finish the process (if I set it below 2.5s ~ 2500ms the image will still be pixelated)

try {
            Thread.sleep(2000);
        } catch (InterruptedException ex) {
            Thread.currentThread().interrupt();
        }

Can someone advise me what I should do with this situation? is it the way I generate the image or Somehow I can check if the Image is perfectly generated and then allow the user to take the image again. I believe it should have been possible for the user to take multiple images in a short time.

Upvotes: 0

Views: 90

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