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
publicclassMainActivityextendsAppCompatActivity{
privateImageViewindicator;//表示圆点指示器
privateImageView[]indicators;//保存圆点指示器的数组
privatebooleaniscontinue=true;
privateViewPagerviewPager;
privateViewGroupviewGroup;
privateArrayListfragments;
Listimgs=null;
privateAtomicIntegerindex=newAtomicInteger();
privateHandlerviewHandler=newHandler(){
@Override
publicvoidhandleMessage(@NonNullMessagemsg){
super.handleMessage(msg);
viewPager.setCurrentItem(msg.what);
}
};
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
publicvoidinitView(){
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
ListlistPics=newArrayList<>();
ImageViewimg1=newImageView(this);
img1.setBackgroundResource(R.mipmap.food1);
listPics.add(img1);
ImageViewimg2=newImageView(this);
img1.setBackgroundResource(R.mipmap.shop2);
listPics.add(img2);
ImageViewimg3=newImageView(this);
img1.setBackgroundResource(R.mipmap.shop3);
listPics.add(img3);
ImageViewimg4=newImageView(this);
img1.setBackgroundResource(R.mipmap.shop4);
listPics.add(img4);
initFragments();
//动态设置四个圆点属性
indicators=newImageView[listPics.size()];
for(inti=0;iindicators.length-1){
index.getAndAdd(-4);
}
try{
Thread.sleep(2000);
}catch(InterruptedExceptione){
e.printStackTrace();
}
}
privatevoidinitFragments(){
imgs=newArrayList();
imgs.add(R.mipmap.timg1);
imgs.add(R.mipmap.timg2);
imgs.add(R.mipmap.timg3);
imgs.add(R.mipmap.timg4);
}
classpagerAdapterextendsFragmentPagerAdapter{
publicpagerAdapter(FragmentManagerfm){
super(fm);
}
@Override
publicFragmentgetItem(intarg0){
//得到要显示的对象并初始化图片
MyFragmentfm=newMyFragment();
fm.setUrl(imgs.get(arg0));
returnfm;
}
@Override
publicintgetCount(){
returnimgs.size();
}
}
}
classMyPagerAdapterextendsPagerAdapter{
privateListviewList;
publicMyPagerAdapter(ListviewList){
this.viewList=viewList;
}
@Override
publicintgetCount(){
returnviewList.size();
}
@Override
publicbooleanisViewFromObject(@NonNullViewview,@NonNullObjectobject){
returnview==object;
}
@NonNull
@Override
publicObjectinstantiateItem(@NonNullViewGroupcontainer,intposition){
container.addView(viewList.get(position));
returnviewList.get(position);
}
@Override
publicvoiddestroyItem(@NonNullViewGroupcontainer,intposition,@NonNullObjectobject){
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毛票票。