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：

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！