前言：经常会看到有一些app的banner界面可以实现循环播放多个广告图片和手动滑动循环。本以为单纯的ViewPager就可以实现这些功能。但是蛋疼的事情来了，ViewPager并不支持循环翻页。所以要实现循环还得需要自己去动手。自己在网上也找了些例子，本博文的Demo是结合自己找到的一些相关例子的基础上去改造，也希望对读者有用。

Demo实现的效果图如下：

Demo代码：

工程目录如下图：

废话不多说，上代码。

1.主Activity代码如下：

package com.stevenhu.android.phone.ui; 
import java.util.ArrayList; 
import java.util.List; 
import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator; 
import com.nostra13.universalimageloader.core.DisplayImageOptions; 
import com.nostra13.universalimageloader.core.ImageLoader; 
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration; 
import com.nostra13.universalimageloader.core.assist.QueueProcessingType; 
import com.stevenhu.android.phone.bean.ADInfo; 
import com.stevenhu.android.phone.utils.ViewFactory; 
import android.annotation.SuppressLint; 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.ImageView; 
import android.widget.Toast; 
import cn.androiddevelop.cycleviewpager.lib.CycleViewPager; 
import cn.androiddevelop.cycleviewpager.lib.CycleViewPager.ImageCycleViewListener; 
/** 
* 描述：主页 
* 
* @author stevenhu 
* @version 2015年5月8日 上午10:47:37 
*/ 
public class MainActivity extends Activity { 
private List<ImageView> views = new ArrayList<ImageView>(); 
private List<ADInfo> infos = new ArrayList<ADInfo>(); 
private CycleViewPager cycleViewPager; 
private String[] imageUrls = {"http://img.taodiantong.cn/v55183/infoimg/2013-07/130720115322ky.jpg", 
"http://pic30.nipic.com/20130626/8174275_085522448172_2.jpg", 
"http://pic18.nipic.com/20111215/577405_080531548148_2.jpg", 
"http://pic15.nipic.com/20110722/2912365_092519919000_2.jpg", 
"http://pic.58pic.com/58pic/12/64/27/55U58PICrdX.jpg"}; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.ui_main); 
configImageLoader(); 
initialize(); 
} 
@SuppressLint("NewApi") 
private void initialize() { 
cycleViewPager = (CycleViewPager) getFragmentManager() 
.findFragmentById(R.id.fragment_cycle_viewpager_content); 
for(int i = 0; i < imageUrls.length; i ++){ 
ADInfo info = new ADInfo(); 
info.setUrl(imageUrls[i]); 
info.setContent("图片-->" + i ); 
infos.add(info); 
} 
// 将最后一个ImageView添加进来 
views.add(ViewFactory.getImageView(this, infos.get(infos.size() - 1).getUrl())); 
for (int i = 0; i < infos.size(); i++) { 
views.add(ViewFactory.getImageView(this, infos.get(i).getUrl())); 
} 
// 将第一个ImageView添加进来 
views.add(ViewFactory.getImageView(this, infos.get(0).getUrl())); 
// 设置循环，在调用setData方法前调用 
cycleViewPager.setCycle(true); 
// 在加载数据前设置是否循环 
cycleViewPager.setData(views, infos, mAdCycleViewListener); 
//设置轮播 
cycleViewPager.setWheel(true); 
// 设置轮播时间，默认5000ms 
cycleViewPager.setTime(2000); 
//设置圆点指示图标组居中显示，默认靠右 
cycleViewPager.setIndicatorCenter(); 
} 
private ImageCycleViewListener mAdCycleViewListener = new ImageCycleViewListener() { 
@Override 
public void onImageClick(ADInfo info, int position, View imageView) { 
if (cycleViewPager.isCycle()) { 
position = position - 1; 
Toast.makeText(MainActivity.this, 
"position-->" + info.getContent(), Toast.LENGTH_SHORT) 
.show(); 
} 
} 
}; 
/** 
* 配置ImageLoder 
*/ 
private void configImageLoader() { 
// 初始化ImageLoader 
@SuppressWarnings("deprecation") 
DisplayImageOptions options = new DisplayImageOptions.Builder().showStubImage(R.drawable.icon_stub) // 设置图片下载期间显示的图片 
.showImageForEmptyUri(R.drawable.icon_empty) // 设置图片Uri为空或是错误的时候显示的图片 
.showImageOnFail(R.drawable.icon_error) // 设置图片加载或解码过程中发生错误显示的图片 
.cacheInMemory(true) // 设置下载的图片是否缓存在内存中 
.cacheOnDisc(true) // 设置下载的图片是否缓存在SD卡中 
// .displayer(new RoundedBitmapDisplayer(20)) // 设置成圆角图片 
.build(); // 创建配置过得DisplayImageOption对象 
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext()).defaultDisplayImageOptions(options) 
.threadPriority(Thread.NORM_PRIORITY - 2).denyCacheImageMultipleSizesInMemory() 
.discCacheFileNameGenerator(new Md5FileNameGenerator()).tasksProcessingOrder(QueueProcessingType.LIFO).build(); 
ImageLoader.getInstance().init(config); 
} 
} 

2.主文件ui_main.xml代码如下：

<?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" > 
<fragment 
android:id="@+id/fragment_cycle_viewpager_content" 
android:name="cn.androiddevelop.cycleviewpager.lib.CycleViewPager" 
android:layout_width="match_parent" 
android:layout_height="180dip" /> 
<RelativeLayout 
android:layout_width="fill_parent" 
android:layout_height="0dip" 
android:layout_weight="1"> 
<TextView 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_centerInParent="true" 
android:text="content"/> 
</RelativeLayout> 
</LinearLayout> 

3.CycleViewPager类代码如下：

package cn.androiddevelop.cycleviewpager.lib; 
import java.util.ArrayList; 
import java.util.List; 
import android.annotation.SuppressLint; 
import android.app.Fragment; 
import android.os.Bundle; 
import android.os.Message; 
import android.support.v4.view.PagerAdapter; 
import android.support.v4.view.ViewPager.OnPageChangeListener; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.FrameLayout; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
import android.widget.RelativeLayout; 
import com.stevenhu.android.phone.bean.ADInfo; 
import com.stevenhu.android.phone.ui.R; 
/** 
* 实现可循环，可轮播的viewpager 
*/ 
@SuppressLint("NewApi") 
public class CycleViewPager extends Fragment implements OnPageChangeListener { 
private List<ImageView> imageViews = new ArrayList<ImageView>(); 
private ImageView[] indicators; 
private FrameLayout viewPagerFragmentLayout; 
private LinearLayout indicatorLayout; // 指示器 
private BaseViewPager viewPager; 
private BaseViewPager parentViewPager; 
private ViewPagerAdapter adapter; 
private CycleViewPagerHandler handler; 
private int time = 5000; // 默认轮播时间 
private int currentPosition = 0; // 轮播当前位置 
private boolean isScrolling = false; // 滚动框是否滚动着 
private boolean isCycle = false; // 是否循环 
private boolean isWheel = false; // 是否轮播 
private long releaseTime = 0; // 手指松开、页面不滚动时间，防止手机松开后短时间进行切换 
private int WHEEL = 100; // 转动 
private int WHEEL_WAIT = 101; // 等待 
private ImageCycleViewListener mImageCycleViewListener; 
private List<ADInfo> infos; 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
Bundle savedInstanceState) { 
View view = LayoutInflater.from(getActivity()).inflate( 
R.layout.view_cycle_viewpager_contet, null); 
viewPager = (BaseViewPager) view.findViewById(R.id.viewPager); 
indicatorLayout = (LinearLayout) view 
.findViewById(R.id.layout_viewpager_indicator); 
viewPagerFragmentLayout = (FrameLayout) view 
.findViewById(R.id.layout_viewager_content); 
handler = new CycleViewPagerHandler(getActivity()) { 
@Override 
public void handleMessage(Message msg) { 
super.handleMessage(msg); 
if (msg.what == WHEEL && imageViews.size() != 0) { 
if (!isScrolling) { 
int max = imageViews.size() + 1; 
int position = (currentPosition + 1) % imageViews.size(); 
viewPager.setCurrentItem(position, true); 
if (position == max) { // 最后一页时回到第一页 
viewPager.setCurrentItem(1, false); 
} 
} 
releaseTime = System.currentTimeMillis(); 
handler.removeCallbacks(runnable); 
handler.postDelayed(runnable, time); 
return; 
} 
if (msg.what == WHEEL_WAIT && imageViews.size() != 0) { 
handler.removeCallbacks(runnable); 
handler.postDelayed(runnable, time); 
} 
} 
}; 
return view; 
} 
public void setData(List<ImageView> views, List<ADInfo> list, ImageCycleViewListener listener) { 
setData(views, list, listener, 0); 
} 
/** 
* 初始化viewpager 
* 
* @param views 
* 要显示的views 
* @param showPosition 
* 默认显示位置 
*/ 
public void setData(List<ImageView> views, List<ADInfo> list, ImageCycleViewListener listener, int showPosition) { 
mImageCycleViewListener = listener; 
infos = list; 
this.imageViews.clear(); 
if (views.size() == 0) { 
viewPagerFragmentLayout.setVisibility(View.GONE); 
return; 
} 
for (ImageView item : views) { 
this.imageViews.add(item); 
} 
int ivSize = views.size(); 
// 设置指示器 
indicators = new ImageView[ivSize]; 
if (isCycle) 
indicators = new ImageView[ivSize - 2]; 
indicatorLayout.removeAllViews(); 
for (int i = 0; i < indicators.length; i++) { 
View view = LayoutInflater.from(getActivity()).inflate( 
R.layout.view_cycle_viewpager_indicator, null); 
indicators[i] = (ImageView) view.findViewById(R.id.image_indicator); 
indicatorLayout.addView(view); 
} 
adapter = new ViewPagerAdapter(); 
// 默认指向第一项，下方viewPager.setCurrentItem将触发重新计算指示器指向 
setIndicator(0); 
viewPager.setOffscreenPageLimit(3); 
viewPager.setOnPageChangeListener(this); 
viewPager.setAdapter(adapter); 
if (showPosition < 0 || showPosition >= views.size()) 
showPosition = 0; 
if (isCycle) { 
showPosition = showPosition + 1; 
} 
viewPager.setCurrentItem(showPosition); 
} 
/** 
* 设置指示器居中，默认指示器在右方 
*/ 
public void setIndicatorCenter() { 
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams( 
RelativeLayout.LayoutParams.WRAP_CONTENT, 
RelativeLayout.LayoutParams.WRAP_CONTENT); 
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); 
params.addRule(RelativeLayout.CENTER_HORIZONTAL); 
indicatorLayout.setLayoutParams(params); 
} 
/** 
* 是否循环，默认不开启，开启前，请将views的最前面与最后面各加入一个视图，用于循环 
* 
* @param isCycle 
* 是否循环 
*/ 
public void setCycle(boolean isCycle) { 
this.isCycle = isCycle; 
} 
/** 
* 是否处于循环状态 
* 
* @return 
*/ 
public boolean isCycle() { 
return isCycle; 
} 
/** 
* 设置是否轮播，默认不轮播,轮播一定是循环的 
* 
* @param isWheel 
*/ 
public void setWheel(boolean isWheel) { 
this.isWheel = isWheel; 
isCycle = true; 
if (isWheel) { 
handler.postDelayed(runnable, time); 
} 
} 
/** 
* 是否处于轮播状态 
* 
* @return 
*/ 
public boolean isWheel() { 
return isWheel; 
} 
final Runnable runnable = new Runnable() { 
@Override 
public void run() { 
if (getActivity() != null && !getActivity().isFinishing() 
&& isWheel) { 
long now = System.currentTimeMillis(); 
// 检测上一次滑动时间与本次之间是否有触击(手滑动)操作，有的话等待下次轮播 
if (now - releaseTime > time - 500) { 
handler.sendEmptyMessage(WHEEL); 
} else { 
handler.sendEmptyMessage(WHEEL_WAIT); 
} 
} 
} 
}; 
/** 
* 释放指示器高度，可能由于之前指示器被限制了高度，此处释放 
*/ 
public void releaseHeight() { 
getView().getLayoutParams().height = RelativeLayout.LayoutParams.MATCH_PARENT; 
refreshData(); 
} 
/** 
* 设置轮播暂停时间，即没多少秒切换到下一张视图.默认5000ms 
* 
* @param time 
* 毫秒为单位 
*/ 
public void setTime(int time) { 
this.time = time; 
} 
/** 
* 刷新数据，当外部视图更新后，通知刷新数据 
*/ 
public void refreshData() { 
if (adapter != null) 
adapter.notifyDataSetChanged(); 
} 
/** 
* 隐藏CycleViewPager 
*/ 
public void hide() { 
viewPagerFragmentLayout.setVisibility(View.GONE); 
} 
/** 
* 返回内置的viewpager 
* 
* @return viewPager 
*/ 
public BaseViewPager getViewPager() { 
return viewPager; 
} 
/** 
* 页面适配器 返回对应的view 
* 
* @author Yuedong Li 
* 
*/ 
private class ViewPagerAdapter extends PagerAdapter { 
@Override 
public int getCount() { 
return imageViews.size(); 
} 
@Override 
public boolean isViewFromObject(View arg0, Object arg1) { 
return arg0 == arg1; 
} 
@Override 
public void destroyItem(ViewGroup container, int position, Object object) { 
container.removeView((View) object); 
} 
@Override 
public View instantiateItem(ViewGroup container, final int position) { 
ImageView v = imageViews.get(position); 
if (mImageCycleViewListener != null) { 
v.setOnClickListener(new OnClickListener() { 
@Override 
public void onClick(View v) { 
mImageCycleViewListener.onImageClick(infos.get(currentPosition - 1), currentPosition, v); 
} 
}); 
} 
container.addView(v); 
return v; 
} 
@Override 
public int getItemPosition(Object object) { 
return POSITION_NONE; 
} 
} 
@Override 
public void onPageScrollStateChanged(int arg0) { 
if (arg0 == 1) { // viewPager在滚动 
isScrolling = true; 
return; 
} else if (arg0 == 0) { // viewPager滚动结束 
if (parentViewPager != null) 
parentViewPager.setScrollable(true); 
releaseTime = System.currentTimeMillis(); 
viewPager.setCurrentItem(currentPosition, false); 
} 
isScrolling = false; 
} 
@Override 
public void onPageScrolled(int arg0, float arg1, int arg2) { 
} 
@Override 
public void onPageSelected(int arg0) { 
int max = imageViews.size() - 1; 
int position = arg0; 
currentPosition = arg0; 
if (isCycle) { 
if (arg0 == 0) { 
currentPosition = max - 1; 
} else if (arg0 == max) { 
currentPosition = 1; 
} 
position = currentPosition - 1; 
} 
setIndicator(position); 
} 
/** 
* 设置viewpager是否可以滚动 
* 
* @param enable 
*/ 
public void setScrollable(boolean enable) { 
viewPager.setScrollable(enable); 
} 
/** 
* 返回当前位置,循环时需要注意返回的position包含之前在views最前方与最后方加入的视图，即当前页面试图在views集合的位置 
* 
* @return 
*/ 
public int getCurrentPostion() { 
return currentPosition; 
} 
/** 
* 设置指示器 
* 
* @param selectedPosition 
* 默认指示器位置 
*/ 
private void setIndicator(int selectedPosition) { 
for (int i = 0; i < indicators.length; i++) { 
indicators[i] 
.setBackgroundResource(R.drawable.icon_point); 
} 
if (indicators.length > selectedPosition) 
indicators[selectedPosition] 
.setBackgroundResource(R.drawable.icon_point_pre); 
} 
/** 
* 如果当前页面嵌套在另一个viewPager中，为了在进行滚动时阻断父ViewPager滚动，可以 阻止父ViewPager滑动事件 
* 父ViewPager需要实现ParentViewPager中的setScrollable方法 
*/ 
public void disableParentViewPagerTouchEvent(BaseViewPager parentViewPager) { 
if (parentViewPager != null) 
parentViewPager.setScrollable(false); 
} 
/** 
* 轮播控件的监听事件 
* 
* @author minking 
*/ 
public static interface ImageCycleViewListener { 
/** 
* 单击图片事件 
* 
* @param position 
* @param imageView 
*/ 
public void onImageClick(ADInfo info, int postion, View imageView); 
} 
}

CycleViewPager类为实现可循环，可轮播的ViewPager的核心类，继承自Fragment，具体实现原理就不多说了，代码中都有相关的注释。

以上所述是小编给大家介绍的Android实现Banner界面广告图片循环轮播（包括实现手动滑动循环)，希望对大家有所帮助！