Question

我使用自定义视图寻呼机适配器创建视图寻呼机但是当我运行项目时我看不到任何内容

  public class CustomAdapter extends PagerAdapter {

        private List<NewsObject> newsObjects;
        private Activity mActivity;
        private LayoutInflater inflater;
        private ImageLoaderConfiguration imageConfig;
        private ImageLoader imageLoader = ImageLoader.getInstance();

        public CustomAdapter(List<NewsObject> newsObjects, Activity mActivity) {
            super();
            Log.d("Con :", "structor");
            this.newsObjects = newsObjects;
            this.mActivity = mActivity;
            imageConfig = new ImageLoaderConfiguration.Builder(
                    mActivity.getApplicationContext()).build();
            imageLoader.init(imageConfig);
        }

        @Override
        public int getCount() {
            return this.newsObjects.size();
        }

        @Override
        public void destroyItem(View collection, int position, Object view) {
            ((ViewPager) collection).removeView((View) view);
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {

            ImageViewPlus img_news_image;
            TextView txt_news_title;
            TextView txt_news_description;

            inflater = (LayoutInflater) mActivity
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            View viewLayout = inflater.inflate(R.layout.detail_news_page, null);

            img_news_image = (ImageViewPlus) viewLayout
                    .findViewById(R.id.img_detail_news_image);
            txt_news_title = (TextView) viewLayout
                    .findViewById(R.id.txt_detail_news_title);
            txt_news_description = (TextView) viewLayout
                    .findViewById(R.id.txt_detail_news_description);

            Log.d("TAG :", "instantiateItem");

            imageLoader.displayImage(newsObjects.get(position).getNews_image(),
                    img_news_image);

            Toast.makeText(mActivity.getApplicationContext(),
                    Constantz.newsObjects.get(position).getNews_id() + "",
                    Toast.LENGTH_SHORT).show();

            txt_news_title.setText(newsObjects.get(position).getNews_title());
            txt_news_description.setText(newsObjects.get(position)
                    .getNews_description());

            return viewLayout;
        }

    }

但是吐司正在显示但我在我的应用程序上看不到任何文字

Answer 1

写

container.addView(viewLayout);

在instantiateItem

中返回视图之前

  public Object instantiateItem(ViewGroup container, int position) {

        ImageViewPlus img_news_image;
        TextView txt_news_title;
        TextView txt_news_description;

        inflater = (LayoutInflater) mActivity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View viewLayout = inflater.inflate(R.layout.detail_news_page, null);

        img_news_image = (ImageViewPlus) viewLayout
                .findViewById(R.id.img_detail_news_image);
        txt_news_title = (TextView) viewLayout
                .findViewById(R.id.txt_detail_news_title);
        txt_news_description = (TextView) viewLayout
                .findViewById(R.id.txt_detail_news_description);

        Log.d("TAG :", "instantiateItem");

        imageLoader.displayImage(newsObjects.get(position).getNews_image(),
                img_news_image);

        Toast.makeText(mActivity.getApplicationContext(),
                Constantz.newsObjects.get(position).getNews_id() + "",
                Toast.LENGTH_SHORT).show();

        txt_news_title.setText(newsObjects.get(position).getNews_title());
        txt_news_description.setText(newsObjects.get(position)
                .getNews_description());
        container.addView(viewLayout);

        return viewLayout;
    }

Answer 2

您错过了将视图添加到容器中。需要在返回视图之前添加。

((ViewPager) container).addView(viewLayout);

同时确保您已为View Pager设置当前项目。

Answer 3

您没有将视图添加到容器中。

container.addView(viewLayout, 0);

Answer 4

<TabHost
     ......
<TabWidget
.....
<FrameLayout
     android:id="@android:id/tabcontent"
     android:layout_width="0dp"
     android:layout_height="0dp" >
</FrameLayout>
<android.support.v4.view.ViewPager

ViewPager没有显示任何内容

4 个答案: