Android UI实现广告Banner轮播效果

本篇博客要分享的一个效果是实现广告banner轮播效果，这个效果也比较常见，一些视频类应用就经常有，就拿360影视大全来举例吧：

 

用红框框住的那个效果就是小巫今天要分享的，先来思考一下会用到什么控件？有什么用户体验？

 控件我们可能一下子就可以想到的自然是viewpager,没错！用到的就是viewpager,那么它会有什么用户体验呢，它可能有以下几个体验：

 1. 间隔不停的切换图片，指示器也跟着变

 2. 点击图片可以跳转到指定的页面

如何实现？

布局开始着手
/bannerautoscrolldemo/res/layout/banner.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" >

 <framelayout
  android:layout_width="match_parent"
  android:layout_height="210dp" >

  <android.support.v4.view.viewpager
   android:id="@+id/vp"
   android:layout_width="match_parent"
   android:layout_height="210dp" />

  <relativelayout
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:layout_gravity="bottom"
   android:background="@drawable/shadow_article" >

   <textview
    android:id="@+id/tv_date"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/author_layout"
    android:layout_marginbottom="10dp"
    android:layout_marginleft="10dp"
    android:maxlines="2"
    android:text="3月4日"
    android:textcolor="@color/white"
    android:textsize="18sp" />

   <textview
    android:id="@+id/tv_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/author_layout"
    android:layout_marginbottom="10dp"
    android:layout_marginleft="10dp"
    android:layout_marginright="10dp"
    android:layout_torightof="@+id/tv_date"
    android:maxlines="2"
    android:text="我和*只是同姓"
    android:textcolor="@color/white"
    android:textsize="18sp" />

   <relativelayout
    android:id="@+id/author_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignparentbottom="true"
    android:layout_marginleft="10dp"
    android:gravity="center_vertical"
    android:paddingbottom="20dp" >

    <textview
     android:id="@+id/tv_pre"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="文章选题来自"
     android:textcolor="@color/white"
     android:textsize="12sp" />

    <textview
     android:id="@+id/tv_topic_from"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_torightof="@+id/tv_pre"
     android:text="阿宅的"
     android:textcolor="@color/white"
     android:textsize="12sp" />

    <textview
     android:id="@+id/tv_topic"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_marginleft="10dp"
     android:layout_torightof="@+id/tv_topic_from"
     android:text="“我想知道令狐安和*有什么关系？”"
     android:textcolor="@color/white"
     android:textsize="12sp" />
   </relativelayout>
  </relativelayout>

  <linearlayout
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_margintop="10dip"
   android:layout_gravity="bottom|center_horizontal"
   android:layout_marginbottom="10dp"
   android:gravity="center" >

   <view
    android:id="@+id/v_dot0"
    style="@style/dot_style"
    android:background="@drawable/dot_focused"
    android:visibility="invisible" />

   <view
    android:id="@+id/v_dot1"
    style="@style/dot_style" 
    android:visibility="invisible"/>

   <view
    android:id="@+id/v_dot2"
    style="@style/dot_style" 
    android:visibility="invisible"/>

   <view
    android:id="@+id/v_dot3"
    style="@style/dot_style" 
    android:visibility="invisible"/>

   <view
    android:id="@+id/v_dot4"
    style="@style/dot_style"
    android:visibility="invisible" />
  </linearlayout>
 </framelayout>

</linearlayout>

一个viewpager,下面五个指示点，注意每个点都有同样的样式，我们在style.xml中定义样式：
/bannerautoscrolldemo/res/values/styles.xml

<style name="dot_style">
  <item name="android:layout_width">5dip</item>
  <item name="android:layout_height">5dip</item>
  <item name="android:background">@drawable/dot_normal</item>
  <item name="android:layout_marginleft">1.5dip</item>
  <item name="android:layout_marginright">1.5dip</item>
 </style>

定义圆点图形资源
/bannerautoscrolldemo/res/drawable/dot_normal.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="oval" >

 <solid android:color="#33000000" />

 <corners android:radius="5dip" />

</shape>

/bannerautoscrolldemo/res/drawable/dot_focused.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="oval" >

 <solid android:color="#aaffffff" />

 <corners android:radius="5dip" />

</shape>

定义广告实体
/bannerautoscrolldemo/src/com/xiaowu/banner/demo/addomain.java

package com.xiaowu.banner.demo;

/**
 * 广告实体
 * 
 * @author wwj_748
 * 
 */
public class addomain {
 private string id; // 广告id
 private string date; // 日期
 private string title; // 标题
 private string topicfrom; //选题来自 
 private string topic; // 选题
 private string imgurl; // 图片url
 private boolean isad; // 是否为广告
 private string starttime; // 广告开始时间
 private string endtime; // 广告结束时间
 private string targeturl; // 目标url
 private int width; // 宽
 private int height; // 高
 private boolean available; // 是否可用
 

 public string getid() {
 return id;
 }

 public void setid(string id) {
 this.id = id;
 }

 public string gettitle() {
 return title;
 }

 public void settitle(string title) {
 this.title = title;
 }

 public string getimgurl() {
 return imgurl;
 }

 public void setimgurl(string imgurl) {
 this.imgurl = imgurl;
 }

 public boolean isad() {
 return isad;
 }

 public void setad(boolean isad) {
 this.isad = isad;
 }

 public string getdate() {
 return date;
 }

 public void setdate(string date) {
 this.date = date;
 }

 public string gettopic() {
 return topic;
 }

 public void settopic(string topic) {
 this.topic = topic;
 }

 public string gettopicfrom() {
 return topicfrom;
 }

 public void settopicfrom(string topicfrom) {
 this.topicfrom = topicfrom;
 }

 public string getstarttime() {
 return starttime;
 }

 public void setstarttime(string starttime) {
 this.starttime = starttime;
 }

 public string getendtime() {
 return endtime;
 }

 public void setendtime(string endtime) {
 this.endtime = endtime;
 }

 public string gettargeturl() {
 return targeturl;
 }

 public void settargeturl(string targeturl) {
 this.targeturl = targeturl;
 }

 public int getwidth() {
 return width;
 }

 public void setwidth(int width) {
 this.width = width;
 }

 public int getheight() {
 return height;
 }

 public void setheight(int height) {
 this.height = height;
 }

 public boolean isavailable() {
 return available;
 }

 public void setavailable(boolean available) {
 this.available = available;
 }
 

}

实现切换逻辑

1. 定时切换

2. 切换图片

3. 切换标题

4. 切换指示器

定时切换用到一个类：scheduledexecutorservice

作用是定时执行任务，我们这里要做的定时任务是，2秒执行一次图片切换

private void startad() {
 scheduledexecutorservice = executors.newsinglethreadscheduledexecutor();
 // 当activity显示出来后，每两秒切换一次图片显示
 scheduledexecutorservice.scheduleatfixedrate(new scrolltask(), 1, 2,
 timeunit.seconds);
 }

定义子线程

private class scrolltask implements runnable {

 @override
 public void run() {
 synchronized (adviewpager) {
 currentitem = (currentitem + 1) % imageviews.size();
 handler.obtainmessage().sendtotarget();
 }
 }
 }

通过handle来通知viewpager进行视图切换

private handler handler = new handler() {
 public void handlemessage(android.os.message msg) {
 adviewpager.setcurrentitem(currentitem);
 };
 };

我们提供模拟数据来进行测试

/**
 * 轮播广播模拟数据
 * 
 * @return
 */
 public static list<addomain> getbannerad() {
 list<addomain> adlist = new arraylist<addomain>();

 addomain addomain = new addomain();
 addomain.setid("108078");
 addomain.setdate("3月4日");
 addomain.settitle("我和*只是同姓");
 addomain.settopicfrom("阿宅");
 addomain.settopic("我想知道令狐安和*有什么关系？");
 addomain.setimgurl("/d50735fae6cd7b8900d74cd40c2442a7d9330e29.jpg");
 addomain.setad(false);
 adlist.add(addomain);

 addomain addomain2 = new addomain();
 addomain2.setid("108078");
 addomain2.setdate("3月5日");
 addomain2.settitle("我和*只是同姓");
 addomain2.settopicfrom("小巫");
 addomain2.settopic("“我想知道令狐安和*有什么关系？”");
 addomain2
 .setimgurl("/eaf81a4c510fd9f9a1edb58b262dd42a2934a45e.jpg");
 addomain2.setad(false);
 adlist.add(addomain2);

 addomain addomain3 = new addomain();
 addomain3.setid("108078");
 addomain3.setdate("3月6日");
 addomain3.settitle("我和*只是同姓");
 addomain3.settopicfrom("旭东");
 addomain3.settopic("“我想知道令狐安和*有什么关系？”");
 addomain3
 .setimgurl("/8718367adab44aed22a58aeeb11c8701a08bfbd4.jpg");
 addomain3.setad(false);
 adlist.add(addomain3);

 addomain addomain4 = new addomain();
 addomain4.setid("108078");
 addomain4.setdate("3月7日");
 addomain4.settitle("我和*只是同姓");
 addomain4.settopicfrom("小软");
 addomain4.settopic("“我想知道令狐安和*有什么关系？”");
 addomain4
 .setimgurl("/a686c9177f3e670932e4cf9338c79f3df9dc55f2.jpg");
 addomain4.setad(false);
 adlist.add(addomain4);

 addomain addomain5 = new addomain();
 addomain5.setid("108078");
 addomain5.setdate("3月8日");
 addomain5.settitle("我和*只是同姓");
 addomain5.settopicfrom("大熊");
 addomain5.settopic("“我想知道令狐安和*有什么关系？”");
 addomain5
 .setimgurl("/0bd162d9f2d3572c7dad11ba8913632762d0c30d.jpg");
 addomain5.setad(true); // 代表是广告
 adlist.add(addomain5);

 return adlist;
 }

viewpager逻辑处理

1. 填充数据（自定义adapter)

2. 设置页面切换监听事件

3. 在自定义adapter中的instantiateitem方法设置viewpager点击事件

这里我们的图片是从网上下载的，用到了universal-image-loader-1.8.6-with-sources.jar这个类库，可以实现异步加载图片，具体使用查看代码。

最后给出完整代码：

/bannerautoscrolldemo/src/com/xiaowu/banner/demo/mainactivity.java

package com.xiaowu.banner.demo;

import java.io.file;
import java.util.arraylist;
import java.util.list;
import java.util.concurrent.executors;
import java.util.concurrent.scheduledexecutorservice;
import java.util.concurrent.timeunit;

import android.app.activity;
import android.graphics.bitmap;
import android.os.bundle;
import android.os.handler;
import android.os.parcelable;
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.view.onclicklistener;
import android.view.viewgroup;
import android.widget.imageview;
import android.widget.imageview.scaletype;
import android.widget.textview;

import com.nostra13.universalimageloader.cache.disc.impl.unlimiteddisccache;
import com.nostra13.universalimageloader.cache.memory.impl.lrumemorycache;
import com.nostra13.universalimageloader.core.displayimageoptions;
import com.nostra13.universalimageloader.core.imageloader;
import com.nostra13.universalimageloader.core.imageloaderconfiguration;
import com.nostra13.universalimageloader.core.assist.imagescaletype;
import com.nostra13.universalimageloader.core.assist.queueprocessingtype;

public class mainactivity extends activity {
 
 public static string image_cache_path = "imageloader/cache"; // 图片缓存路径

 private viewpager adviewpager;
 private list<imageview> imageviews;// 滑动的图片集合

 private list<view> dots; // 图片标题正文的那些点
 private list<view> dotlist;

 private textview tv_date;
 private textview tv_title;
 private textview tv_topic_from;
 private textview tv_topic;
 private int currentitem = 0; // 当前图片的索引号
 // 定义的五个指示点
 private view dot0;
 private view dot1;
 private view dot2;
 private view dot3;
 private view dot4;

 // 定时任务
 private scheduledexecutorservice scheduledexecutorservice;

 // 异步加载图片
 private imageloader mimageloader;
 private displayimageoptions options;

 // 轮播banner的数据
 private list<addomain> adlist;

 private handler handler = new handler() {
 public void handlemessage(android.os.message msg) {
 adviewpager.setcurrentitem(currentitem);
 };
 };

 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_main);
 // 使用imageloader之前初始化
 initimageloader();

 // 获取图片加载实例
 mimageloader = imageloader.getinstance();
 options = new displayimageoptions.builder()
 .showstubimage(r.drawable.top_banner_android)
 .showimageforemptyuri(r.drawable.top_banner_android)
 .showimageonfail(r.drawable.top_banner_android)
 .cacheinmemory(true).cacheondisc(true)
 .bitmapconfig(bitmap.config.rgb_565)
 .imagescaletype(imagescaletype.exactly).build();

 initaddata();

 startad();
 }
 
 /**
 * 初始化imageloader
 */
 private void initimageloader() {
 file cachedir = com.nostra13.universalimageloader.utils.storageutils
 .getowncachedirectory(getapplicationcontext(),
  image_cache_path);

 displayimageoptions defaultoptions = new displayimageoptions.builder()
 .cacheinmemory(true).cacheondisc(true).build();

 imageloaderconfiguration config = new imageloaderconfiguration.builder(
 this).defaultdisplayimageoptions(defaultoptions)
 .memorycache(new lrumemorycache(12 * 1024 * 1024))
 .memorycachesize(12 * 1024 * 1024)
 .disccachesize(32 * 1024 * 1024).disccachefilecount(100)
 .disccache(new unlimiteddisccache(cachedir))
 .threadpriority(thread.norm_priority - 2)
 .tasksprocessingorder(queueprocessingtype.lifo).build();

 imageloader.getinstance().init(config);
 }

 /**
 * 初始化广告数据
 */
 private void initaddata() {
 // 广告数据
 adlist = getbannerad();

 imageviews = new arraylist<imageview>();

 // 点
 dots = new arraylist<view>();
 dotlist = new arraylist<view>();
 dot0 = findviewbyid(r.id.v_dot0);
 dot1 = findviewbyid(r.id.v_dot1);
 dot2 = findviewbyid(r.id.v_dot2);
 dot3 = findviewbyid(r.id.v_dot3);
 dot4 = findviewbyid(r.id.v_dot4);
 dots.add(dot0);
 dots.add(dot1);
 dots.add(dot2);
 dots.add(dot3);
 dots.add(dot4);
 
 tv_date = (textview) findviewbyid(r.id.tv_date);
 tv_title = (textview) findviewbyid(r.id.tv_title);
 tv_topic_from = (textview) findviewbyid(r.id.tv_topic_from);
 tv_topic = (textview) findviewbyid(r.id.tv_topic);

 adviewpager = (viewpager) findviewbyid(r.id.vp);
 adviewpager.setadapter(new myadapter());// 设置填充viewpager页面的适配器
 // 设置一个监听器，当viewpager中的页面改变时调用
 adviewpager.setonpagechangelistener(new mypagechangelistener());
 adddynamicview();
 }

 private void adddynamicview() {
 // 动态添加图片和下面指示的圆点
 // 初始化图片资源
 for (int i = 0; i < adlist.size(); i++) {
 imageview imageview = new imageview(this);
 // 异步加载图片
 mimageloader.displayimage(adlist.get(i).getimgurl(), imageview,
  options);
 imageview.setscaletype(scaletype.center_crop);
 imageviews.add(imageview);
 dots.get(i).setvisibility(view.visible);
 dotlist.add(dots.get(i));
 }
 }

 @override
 protected void onresume() {
 super.onresume();
 }

 private void startad() {
 scheduledexecutorservice = executors.newsinglethreadscheduledexecutor();
 // 当activity显示出来后，每两秒切换一次图片显示
 scheduledexecutorservice.scheduleatfixedrate(new scrolltask(), 1, 2,
 timeunit.seconds);
 }

 private class scrolltask implements runnable {

 @override
 public void run() {
 synchronized (adviewpager) {
 currentitem = (currentitem + 1) % imageviews.size();
 handler.obtainmessage().sendtotarget();
 }
 }
 }

 @override
 protected void onstop() {
 super.onstop();
 // 当activity不可见的时候停止切换
 scheduledexecutorservice.shutdown();
 }

 private class mypagechangelistener implements onpagechangelistener {

 private int oldposition = 0;

 @override
 public void onpagescrollstatechanged(int arg0) {
 
 }

 @override
 public void onpagescrolled(int arg0, float arg1, int arg2) {
 
 }

 @override
 public void onpageselected(int position) {
 currentitem = position;
 addomain addomain = adlist.get(position);
 tv_title.settext(addomain.gettitle()); // 设置标题
 tv_date.settext(addomain.getdate());
 tv_topic_from.settext(addomain.gettopicfrom());
 tv_topic.settext(addomain.gettopic());
 dots.get(oldposition).setbackgroundresource(r.drawable.dot_normal);
 dots.get(position).setbackgroundresource(r.drawable.dot_focused);
 oldposition = position;
 }
 }

 private class myadapter extends pageradapter {

 @override
 public int getcount() {
 return adlist.size();
 }

 @override
 public object instantiateitem(viewgroup container, int position) {
 imageview iv = imageviews.get(position);
 ((viewpager) container).addview(iv);
 final addomain addomain = adlist.get(position);
 // 在这个方法里面设置图片的点击事件
 iv.setonclicklistener(new onclicklistener() {

 @override
 public void onclick(view v) {
  // 处理跳转逻辑
 }
 });
 return iv;
 }

 @override
 public void destroyitem(view arg0, int arg1, object arg2) {
 ((viewpager) arg0).removeview((view) arg2);
 }

 @override
 public boolean isviewfromobject(view arg0, object arg1) {
 return arg0 == arg1;
 }

 @override
 public void restorestate(parcelable arg0, classloader arg1) {

 }

 @override
 public parcelable savestate() {
 return null;
 }

 @override
 public void startupdate(view arg0) {

 }

 @override
 public void finishupdate(view arg0) {

 }

 }

 /**
 * 轮播广播模拟数据
 * 
 * @return
 */
 public static list<addomain> getbannerad() {
 list<addomain> adlist = new arraylist<addomain>();

 addomain addomain = new addomain();
 addomain.setid("108078");
 addomain.setdate("3月4日");
 addomain.settitle("我和*只是同姓");
 addomain.settopicfrom("阿宅");
 addomain.settopic("我想知道令狐安和*有什么关系？");
 addomain.setimgurl("/d50735fae6cd7b8900d74cd40c2442a7d9330e29.jpg");
 addomain.setad(false);
 adlist.add(addomain);

 addomain addomain2 = new addomain();
 addomain2.setid("108078");
 addomain2.setdate("3月5日");
 addomain2.settitle("我和*只是同姓");
 addomain2.settopicfrom("小巫");
 addomain2.settopic("“我想知道令狐安和*有什么关系？”");
 addomain2
 .setimgurl("/eaf81a4c510fd9f9a1edb58b262dd42a2934a45e.jpg");
 addomain2.setad(false);
 adlist.add(addomain2);

 addomain addomain3 = new addomain();
 addomain3.setid("108078");
 addomain3.setdate("3月6日");
 addomain3.settitle("我和*只是同姓");
 addomain3.settopicfrom("旭东");
 addomain3.settopic("“我想知道令狐安和*有什么关系？”");
 addomain3
 .setimgurl("/8718367adab44aed22a58aeeb11c8701a08bfbd4.jpg");
 addomain3.setad(false);
 adlist.add(addomain3);

 addomain addomain4 = new addomain();
 addomain4.setid("108078");
 addomain4.setdate("3月7日");
 addomain4.settitle("我和*只是同姓");
 addomain4.settopicfrom("小软");
 addomain4.settopic("“我想知道令狐安和*有什么关系？”");
 addomain4
 .setimgurl("/a686c9177f3e670932e4cf9338c79f3df9dc55f2.jpg");
 addomain4.setad(false);
 adlist.add(addomain4);

 addomain addomain5 = new addomain();
 addomain5.setid("108078");
 addomain5.setdate("3月8日");
 addomain5.settitle("我和*只是同姓");
 addomain5.settopicfrom("大熊");
 addomain5.settopic("“我想知道令狐安和*有什么关系？”");
 addomain5
 .setimgurl("/0bd162d9f2d3572c7dad11ba8913632762d0c30d.jpg");
 addomain5.setad(true); // 代表是广告
 adlist.add(addomain5);

 return adlist;
 }

}

源码下载：http://xiazai.jb51.net/201612/yuanma/androidbannerautoscroll(jb51.net).rar

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。