gistfile1.txt

public class CustomSubsamplingScaleImageView extends SubsamplingScaleImageView {

    private final AtomicBoolean scaleSet = new AtomicBoolean(false);

    public CustomSubsamplingScaleImageView(Context context, AttributeSet attr) {
        super(context, attr);
        setAlpha(0);
    }

    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (scaleSet.get()) {
            setAlpha(1);
        }
    }

    @Override
    protected void onImageReady() {
        post(new Runnable() {
            @Override
            public void run() {
                float scale = Math.min(getWidth() / (float) getSWidth(), (getHeight() - (2 * 100)) / (float) getSHeight());
                setMinScale(scale);
                setMinimumScaleType(SCALE_TYPE_CUSTOM);
                setScaleAndCenter(scale, getCenter());
                postInvalidate();
                scaleSet.set(true);
            }
        });
    }
}