在Adapter的getView方法中动态设置图片的透明失效

Question

public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.white_light_collection_item, null);
holder.title = (TextView) convertView.findViewById(R.id.tv_collect);
holder.white_bg = (ImageView) convertView.findViewById(R.id.white_bg);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}

        holder.title.setText(ControlList.get(position) + "%");

        int myAlpha = (int) (Integer.parseInt(ControlList.get(position))*2.55);
        holder.white_bg.setImageAlpha(myAlpha);

        return convertView;
    }

Answer 1

sorry，是我粗心的原因。我在XMl文件中把ImageView设置的是android:background="xxxxxx"。设置图片是透明度应该是android:src="xxxxxx"