viewpager实现自动循环轮播图

本文实例为大家分享了viewpager自动循环轮播图的具体代码，供大家参考，具体内容如下

布局文件

android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

  

  
 

核心代码

public class MainActivity extends AppCompatActivity {
 private ImageView indicator;//表示圆点指示器
 private ImageView [] indicators;//保存圆点指示器的数组
 private boolean iscontinue = true;
 private ViewPager viewPager;
 private ViewGroup viewGroup;
 private ArrayList fragments;
 List imgs = null;
 private AtomicInteger index = new AtomicInteger();
 private Handler viewHandler= new Handler(){
  @Override
  public void handleMessage(@NonNull Message msg) {
   super.handleMessage(msg);
   viewPager.setCurrentItem(msg.what);
  }
 };

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  initView();
 }
 public void initView(){
  viewPager=findViewById(R.id.vp_adv);
  viewGroup=findViewById(R.id.View_indicator);
  //四张广告图片加载到集合中进行保存
  List listPics = new ArrayList<>();
  ImageView img1 = new ImageView(this);
  img1.setBackgroundResource(R.mipmap.food1);
  listPics.add(img1);
  ImageView img2 = new ImageView(this);
  img1.setBackgroundResource(R.mipmap.shop2);
  listPics.add(img2);
  ImageView img3 = new ImageView(this);
  img1.setBackgroundResource(R.mipmap.shop3);
  listPics.add(img3);
  ImageView img4 = new ImageView(this);
  img1.setBackgroundResource(R.mipmap.shop4);
  listPics.add(img4);
  initFragments();
  //动态设置四个圆点属性
  indicators = new ImageView[listPics.size()];
  for(int i=0;iindicators.length-1){
   index.getAndAdd(-4);
  }
  try {
   Thread.sleep(2000);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
 }
 private void initFragments() {
  imgs = new ArrayList();
  imgs.add(R.mipmap.timg1);
  imgs.add(R.mipmap.timg2);
  imgs.add(R.mipmap.timg3);
  imgs.add(R.mipmap.timg4);

 }
 class pagerAdapter extends FragmentPagerAdapter{

  public pagerAdapter(FragmentManager fm) {
   super(fm);
  }

  @Override
  public Fragment getItem(int arg0) {
   //得到要显示的对象并初始化图片
   MyFragment fm = new MyFragment();
   fm.setUrl(imgs.get(arg0));

   return fm;
  }

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

 }
}

class MyPagerAdapter extends PagerAdapter{
 private List viewList;
 public MyPagerAdapter(ListviewList){
  this.viewList = viewList;
 }

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

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

 @NonNull
 @Override
 public Object instantiateItem(@NonNull ViewGroup container, int position) {
  container.addView(viewList.get(position));
  return viewList.get(position);
 }

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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。