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In my application I have to manage lot of images taken by the Android Camera.
The problem is that when I have a lot of pictures the phone has a lack of memory and works very slowly. I want to still be able to manage the same number of images but without the memory issues
Any advice on what I should do to achieve this?
Answer
You should decode a scaled images.
You can reduce the amount of dynamic heap used by expanding the JPEG into a memory array that’s already scaled to match the size of the destination view.
The following example method demonstrates this technique:
private void setPic() {
// Get the dimensions of the View
int targetW = mImageView.getWidth();
int targetH = mImageView.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = true;
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
mImageView.setImageBitmap(bitmap);
}
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