Viewpager无限轮播

最新推荐文章于 2019-03-24 22:30:00 发布

原创最新推荐文章于 2019-03-24 22:30:00 发布 · 199 阅读

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CC 4.0 BY-SA版权

本文展示了一个使用Android中ViewPager组件实现图片轮播的基本示例。通过创建自定义的PagerAdapter并利用ImageView显示不同资源文件中的图片，实现了无限循环轮播的效果。

public class MainActivity extends Activity {

ViewPager pager;
List<ImageView> list = new ArrayList<ImageView>();
int[] ids = new int[]{R.drawable.img1,R.drawable.img2,R.drawable.img3};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

pager = (ViewPager) findViewById(R.id.pager);
for (int i = 0; i < 3; i++) {
ImageView img = new ImageView(MainActivity.this);
img.setImageResource(ids[i]);
list.add(img);
}
MyAdapter adapter = new MyAdapter();
pager.setAdapter(adapter);
}
class MyAdapter extends PagerAdapter{

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

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

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

@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView img = new ImageView(MainActivity.this);
img.setImageResource(ids[position%3]);
container.addView(img);
return img;
}

}

}