如何在Android中利用viewpager实现一个无限轮播功能？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
小圆点属性
dot_focused.xml
<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <solid android:color="#f00"/> <corners android:radius="8dp"/></shape> dot_normal.xml
<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <solid android:color="#88000000"/> <corners android:radius="8dp"/></shape> dot_layout.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <View android:id="@+id/scrollView" android:layout_width="8dp" android:layout_height="8dp" android:layout_margin="3dp" android:background="@drawable/dot_normal" /></LinearLayout>activity_main.xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <android.support.v4.view.ViewPager android:id="@+id/viewPager" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v4.view.ViewPager> <LinearLayout android:id="@+id/ll" android:layout_marginTop="450dp" android:orientation="horizontal" android:gravity="center" android:layout_width="match_parent" android:layout_height="20dp"/> </RelativeLayout>以上是布局
下面src代码
import android.content.Intent;import android.os.AsyncTask;import android.os.Handler;import android.os.Message;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.ImageView;import android.widget.LinearLayout;import com.bwie.bean.SuperClass;import com.bwie.utils.NetWorkUtils;import com.bwie.utils.URLDB;import com.google.gson.Gson;import com.nostra13.universalimageloader.core.ImageLoader;import java.util.ArrayList;import java.util.List;import java.util.Timer;import java.util.TimerTask;public class MainActivity extends AppCompatActivity { private ViewPager viewPager; private Button bt; private LinearLayout layout; private List<SuperClass.ResultBean.DataBean> data; private NetWorkUtils netWorkUtils = new NetWorkUtils();//实例化工具类 private List<ImageView>imgs = new ArrayList<ImageView>();//图片的集合 private List<View> dots = new ArrayList<View>(); //小圆点集合 private int i = 0; private int dot = 0; private Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); viewPager.setCurrentItem(i); dots.get(dot).setBackgroundResource(R.drawable.dots_normal); dots.get(i%imgs.size()).setBackgroundResource(R.drawable.dots_focus); dot=i%imgs.size(); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //异步网络请求 new AsyncTask<String,Integer,String>(){ @Override protected String doInBackground(String... params) { String json = netWorkUtils.getJsonHttpConnetion(URLDB.URL_IJ); return json; } @Override protected void onPostExecute(String s) { super.onPostExecute(s); SuperClass superClass = new Gson().fromJson(s, SuperClass.class); data = superClass.getResult().getData(); init();//初始化方法 } }.execute(); } //初始化方法 private void init() { viewPager = (ViewPager) findViewById(R.id.viewPager); layout = (LinearLayout) findViewById(R.id.ll); getImgs();//获取图片 getDots();//获取小圆点 //viewPager适配器 viewPager.setAdapter(new PagerAdapter() { @Override public int getCount() { return Integer.MAX_VALUE; } @Override public boolean isViewFromObject(View view, Object object) { return view==object; } @Override public Object instantiateItem(ViewGroup container, int position) { int i = position % imgs.size(); ImageView imageView = imgs.get(i); imageView.setScaleType(ImageView.ScaleType.FIT_XY); container.addView(imageView); return imageView; } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); } }); //设置初始化位置 i = imgs.size()*10; //得到位置 viewPager.setCurrentItem(i); //设置第一个圆点为true dots.get(0).setBackgroundResource(R.drawable.dots_focus); //timer自动轮播 Timer timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { i = viewPager.getCurrentItem() + 1; handler.sendEmptyMessage(i); } },1,2000); } //图片的方法 private void getImgs() { for(int i = 0;i<data.size();i++){ List<SuperClass.ResultBean.DataBean.StepsBean> steps = data.get(i).getSteps(); String url = steps.get(0).getImg(); ImageView img = new ImageView(this); img.setScaleType(ImageView.ScaleType.FIT_XY); ImageLoader.getInstance().displayImage(url,img); imgs.add(img); } } //小圆点的方法 private void getDots() { for(int i=0;i<imgs.size();i++){ View view = LayoutInflater.from(this).inflate(R.layout.dot_item,null); View viewById = view.findViewById(R.id.scrollView); dots.add(viewById); layout.addView(view); } }}关于如何在Android中利用viewpager实现一个无限轮播功能问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注编程网行业资讯频道了解更多相关知识。
