本文實例為大家分享了Android輪播圖無限循環的具體代碼，供大家參考，具體內容如下
實現無限循環
在getCount()方法中，返回一個很大的值，Integer.MAX_VALUE
在instantiateItem()方法中，獲取當前View的索引時，進行取于操作，傳遞進來的int position是個非常大的數，對他進行求余數
在destroyItem()方法中，同樣
在onPageSelected()監聽方法中，對傳遞進來的索引進行取于
反向的無限循環
調用ViewPager對象的setCurrentItem()方法，設置第一次進來時候的當前頁，參數：int數字，我們把它定位到Integer.MAX_VALUE的中間，并且保證第一條是當前位置，Integer.MAX_VALUE/2-((Integer.MAX_VALUE/2)%banners.size())
目前有個左劃空白頁的問題沒解決
package com.tsh.myviewpager;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;public class MainActivity extends Activity { private ViewPager vp_banner; private LinearLayout ll_points; private TextView tv_title; private List<View> banners; private String[] titles=new String[]{ "新聞標題1", "新聞標題2", "新聞標題3" }; private List<ImageView> points=new ArrayList<ImageView>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 初始化 vp_banner = (ViewPager) findViewById(R.id.vp_banner); ll_points = (LinearLayout) findViewById(R.id.ll_points); tv_title = (TextView) findViewById(R.id.tv_title); // banner部分 banners = new ArrayList<>(); ImageView img1 = new ImageView(this); img1.setImageResource(R.drawable.a); banners.add(img1); ImageView img2 = new ImageView(this); img2.setImageResource(R.drawable.b); banners.add(img2); ImageView img3 = new ImageView(this); img3.setImageResource(R.drawable.c); banners.add(img3); //小圖標 ll_points=(LinearLayout) findViewById(R.id.ll_points); for(int i=0;i<banners.size();i++){ ImageView image=new ImageView(this); image.setImageResource(R.drawable.point_selector); LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(5, 5); params.rightMargin=4; image.setLayoutParams(params); if(i==0){ image.setEnabled(true); }else{ image.setEnabled(false); } points.add(image); ll_points.addView(image); } // 設置適配器 vp_banner.setAdapter(new MyPagerAdapter()); vp_banner.setCurrentItem(Integer.MAX_VALUE/2-((Integer.MAX_VALUE/2)%banners.size())); vp_banner.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageSelected(int arg0) { tv_title.setText(titles[arg0%banners.size()]); //小圖標處理 for(ImageView point:points){ point.setEnabled(false); } points.get(arg0%banners.size()).setEnabled(true); } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } }); } private class MyPagerAdapter extends PagerAdapter { @Override public void destroyItem(ViewGroup container, int position, Object object) { System.out.println("銷毀："+position); container.removeView((View)object); object=null; } @Override public Object instantiateItem(ViewGroup container, int position) { System.out.println("初始化："+position); position=position%banners.size(); //解決右劃出錯 if(banners.get(position).getParent()!=null){ //container.removeView(banners.get(position)); }else{ container.addView(banners.get(position)); } return banners.get(position); } @Override public int getCount() { return Integer.MAX_VALUE; } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == arg1; } }}以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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