not downloading image from url

Hi, i set this lib like this but its not working yet.

@Override
protected void onPostExecute(String images) {
try {
JSONArray jsonArray = new JSONArray(images);
//JSONObject jsonObject = new JSONObject(result);
for (int j = 0; j < jsonArray.length(); j++) {
JSONObject object = jsonArray.getJSONObject(j);
final String data = object.getString("name");
url_maps.put("Image", ImageUrl + data);
}
for (int i = 0; i < url_maps.size(); i++) {
textSliderView = new TextSliderView(GalleryActivity.this);
textSliderView
.image(url_maps.get(i))
.setScaleType(BaseSliderView.ScaleType.Fit)
.setOnSliderClickListener(GalleryActivity.this);
textSliderView.bundle(new Bundle());
mDemoSlider.addSlider(textSliderView);
}
mDemoSlider.setPresetTransformer(SliderLayout.Transformer.Accordion);
mDemoSlider.setPresetIndicator(SliderLayout.PresetIndicators.Center_Bottom);
mDemoSlider.setCustomAnimation(new DescriptionAnimation());
mDemoSlider.setDuration(4000);
mDemoSlider.addOnPageChangeListener(GalleryActivity.this);
} catch (JSONException e) {
e.printStackTrace();
}