ViewPager切换图片

最新推荐文章于 2020-02-17 21:14:42 发布

原创最新推荐文章于 2020-02-17 21:14:42 发布 · 650 阅读

CC 4.0 BY-SA版权

本文介绍了一个使用Android中的Fragment2与ViewPager结合的具体实现案例。该示例中，Fragment2继承自Fragment，并通过ViewPager展示了一系列图片。文章展示了如何加载图片资源到ViewPager，并通过自定义适配器进行页面切换。

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public class Fragment2 extends Fragment {
    private View view;
    private ViewPager vp;
    List<Img> list = new ArrayList<>();

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment2,container,false);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        vp = (ViewPager)view.findViewById(R.id.vp);
        list.add(new Img(R.drawable.a));
        list.add(new Img(R.drawable.b));
        list.add(new Img(R.drawable.c));
        list.add(new Img(R.drawable.d));
        list.add(new Img(R.drawable.e));
        vp.setAdapter(new Myadapter2());
    }

    class Myadapter2 extends PagerAdapter {

        @Override
        public int getCount() {
            return list.size();
            //return Integer.MAX_VALUE;
        }

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

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            View view = View.inflate(getActivity(), R.layout.vp, null);
            ImageView imageview3 = (ImageView)view.findViewById(R.id.imageView3);
            imageview3.setImageResource(list.get(position).getImg());
            container.addView(view);
            return view;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((View) object);
        }
    }
}

//子布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">


<ImageView
    android:id="@+id/imageView3"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:srcCompat="@mipmap/ic_launcher" />

</LinearLayout>