动态viewpager加载图片

最新推荐文章于 2021-05-26 22:49:46 发布

原创最新推荐文章于 2021-05-26 22:49:46 发布 · 2k 阅读

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#viewpager #动态图片

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本文介绍了一个自定义PagerAdapter类的实现方式，用于在Android应用中加载网络图片到ViewPager中。该类通过ImageLoader加载图片，并使用LayoutInflater从资源文件创建视图布局，同时提供了ViewPager所需的方法实现，如获取图片数量、实例化和销毁页面等。

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传入网络图片地址就行了

public class MyPagerAdapter extends PagerAdapter {

    private List<String> viewlist;
    private Context mContext;

    public MyPagerAdapter(List<String> viewlist, Context mContext) {
        this.viewlist = viewlist;
        this.mContext = mContext;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return viewlist.size();
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        // TODO Auto-generated method stub
        return arg0 == arg1;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        // TODO Auto-generated method stub

        View imagelayout = LayoutInflater.from(mContext).inflate(
                R.layout.view1, null);
        ImageView imageview = (ImageView) imagelayout
                .findViewById(R.id.imageloaderimageview);

        DisplayImageOptions options = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.drawable.ic_launcher)
                .showImageOnFail(R.drawable.icon15_03_middle)
                .showImageForEmptyUri(R.drawable.icon15_03_middle)
                .cacheInMemory(true).cacheOnDisc(true)
                .bitmapConfig(Bitmap.Config.RGB_565).build();
        ImageLoader.getInstance().displayImage(viewlist.get(position),
                imageview, options);
           ((ViewPager) container).addView(imagelayout, 0);
        return imagelayout;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        // TODO Auto-generated method stub
          ((ViewPager) container).removeView((View) object);
    }

}