Android实现Banner界面广告图片循环轮播（包括实现手动滑动循环）

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：

 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。

  ok，接下来的其他类就不多说了。自己下载Demo学习吧。

   本博文Demo下载链接地址如下：

   http://download.csdn.net/detail/stevenhu_223/8675717

   另外，还有一种通过自定义ViewPager实现和本博文相同效果的广告界面Demo，这里就不再贴代码，可以通过如下地址下载：

   http://download.csdn.net/detail/stevenhu_223/8697903