Decode a part of Bitmap from file in Android

Question

I have a file with a very large image: for example 9000x9000.

I can\'t load the Bitmap in memory because the heap size. But I only need to display a small part of th

Answer 1

Try this code:

public static Bitmap decodeSampledBitmapFromFile(String path, int reqWidth, int reqHeight) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        final int height = options.outHeight;
        final int width = options.outWidth;
        options.inPreferredConfig = Bitmap.Config.RGB_565;
        int inSampleSize = 1;
        if (height > reqHeight) {
            inSampleSize = Math.round((float) height / (float) reqHeight);
        }
        int expectedWidth = width / inSampleSize;
        if (expectedWidth > reqWidth) {
            inSampleSize = Math.round((float) width / (float) reqWidth);
        }
        options.inSampleSize = inSampleSize;
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeFile(path, options);
    }