android - 在 ListView 中添加 viewpager 作为滚动标题

Question

我正在尝试在列表标题中添加 Viewpager(使用支持库 4)，但它没有显示任何内容。这是我的代码请帮助。它将出现在列表标题中，而不是作为一个项目，所以这应该不是问题。

public class CustomActivity extends ListActivity {

    private static int NUM_AWESOME_VIEWS = 20;
    private Context cxt;
    private CustomPageAdapter pageAdapter;

        /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        String[] items = { "this", "is", "my", "list",    "view", "data" };
        this.cxt = this;

        ViewPager viewPager =  new ViewPager(this);

        pageAdapter = new CustomPageAdapter();
        viewPager.setAdapter(pageAdapter);
        viewPager.requestLayout();

        getListView().addHeaderView(viewPager);
        setListAdapter(new ArrayAdapter<String>(this,  android.R.layout.simple_list_item_1, items));

    }

    private class CustomPageAdapter extends PagerAdapter{


            @Override
            public int getCount() {
                    return NUM_AWESOME_VIEWS;
            }

        /**
         * Create the page for the given position.  The adapter is responsible
         * for adding the view to the container given here, although it only
         * must ensure this is done by the time it returns from
         * {@link #finishUpdate()}.
         *
         * @param container The containing View in which the page will be shown.
         * @param position The page position to be instantiated.
         * @return Returns an Object representing the new page.  This does not
         * need to be a View, but can be some other container of the page.
         */
            @Override
            public Object instantiateItem(View collection, int position) {
                    TextView tv = new TextView(cxt);
                    tv.setText("Bonjour PAUG " + position);
                    tv.setTextColor(Color.WHITE);
                    tv.setTextSize(20);

                    ((ViewPager) collection).addView(tv,0);

                    return tv;
            }

        /**
         * Remove a page for the given position.  The adapter is responsible
         * for removing the view from its container, although it only must ensure
         * this is done by the time it returns from {@link #finishUpdate()}.
         *
         * @param container The containing View from which the page will be removed.
         * @param position The page position to be removed.
         * @param object The same object that was returned by
         * {@link #instantiateItem(View, int)}.
         */
            @Override
            public void destroyItem(View collection, int position, Object view) {
                    ((ViewPager) collection).removeView((TextView) view);
            }



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


        /**
         * Called when the a change in the shown pages has been completed.  At this
         * point you must ensure that all of the pages have actually been added or
         * removed from the container as appropriate.
         * @param container The containing View which is displaying this adapter's
         * page views.
         */
            @Override
            public void finishUpdate(View arg0) {

            }


            @Override
            public void restoreState(Parcelable arg0, ClassLoader arg1) {

            }

            @Override
            public Parcelable saveState() {
                    return null;
            }

            @Override
            public void startUpdate(View arg0) {

            }

}

}

Answer 1

listview 页眉和页脚在 setadapter 之后显示。

如果您尝试 setadapter，但看不到 viewpager。检查 viewpager 的宽度和高度。

如果 viewpager 的宽度或高度值为 0。使用布局参数创建 LienarLayout(或任何 ViewGroup)并在 View 组中添加 View viewpager，包括宽度和高度设置。并添加标题 View 组。

我的英语水平不好，如果不明白，添加评论我。

我希望能有所帮助。