Android UI - 实现广告Banner轮播效果
前言 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:
文章图片
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
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
- 5dip
- 5dip
- @drawable/dot_normal
- 1.5dip
- 1.5dip
定义圆点图形资源
/BannerAutoScrollDemo/res/drawable/dot_normal.xml
/BannerAutoScrollDemo/res/drawable/dot_focused.xml
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 getBannerAd() {
List adList = new ArrayList();
AdDomain adDomain = new AdDomain();
adDomain.setId("108078");
adDomain.setDate("3月4日");
adDomain.setTitle("我和令计划只是同姓");
adDomain.setTopicFrom("阿宅");
adDomain.setTopic("我想知道令狐安和令计划有什么关系?");
adDomain.setImgUrl("http://g.hiphotos.baidu.com/image/w%3D310/sign=bb99d6add2c8a786be2a4c0f5708c9c7/d50735fae6cd7b8900d74cd40c2442a7d9330e29.jpg");
adDomain.setAd(false);
adList.add(adDomain);
AdDomain adDomain2 = new AdDomain();
adDomain2.setId("108078");
adDomain2.setDate("3月5日");
adDomain2.setTitle("我和令计划只是同姓");
adDomain2.setTopicFrom("小巫");
adDomain2.setTopic("“我想知道令狐安和令计划有什么关系?”");
adDomain2
.setImgUrl("http://g.hiphotos.baidu.com/image/w%3D310/sign=7cbcd7da78f40ad115e4c1e2672e1151/eaf81a4c510fd9f9a1edb58b262dd42a2934a45e.jpg");
adDomain2.setAd(false);
adList.add(adDomain2);
AdDomain adDomain3 = new AdDomain();
adDomain3.setId("108078");
adDomain3.setDate("3月6日");
adDomain3.setTitle("我和令计划只是同姓");
adDomain3.setTopicFrom("旭东");
adDomain3.setTopic("“我想知道令狐安和令计划有什么关系?”");
adDomain3
.setImgUrl("http://e.hiphotos.baidu.com/image/w%3D310/sign=392ce7f779899e51788e3c1572a6d990/8718367adab44aed22a58aeeb11c8701a08bfbd4.jpg");
adDomain3.setAd(false);
adList.add(adDomain3);
AdDomain adDomain4 = new AdDomain();
adDomain4.setId("108078");
adDomain4.setDate("3月7日");
adDomain4.setTitle("我和令计划只是同姓");
adDomain4.setTopicFrom("小软");
adDomain4.setTopic("“我想知道令狐安和令计划有什么关系?”");
adDomain4
.setImgUrl("http://d.hiphotos.baidu.com/image/w%3D310/sign=54884c82b78f8c54e3d3c32e0a282dee/a686c9177f3e670932e4cf9338c79f3df9dc55f2.jpg");
adDomain4.setAd(false);
adList.add(adDomain4);
AdDomain adDomain5 = new AdDomain();
adDomain5.setId("108078");
adDomain5.setDate("3月8日");
adDomain5.setTitle("我和令计划只是同姓");
adDomain5.setTopicFrom("大熊");
adDomain5.setTopic("“我想知道令狐安和令计划有什么关系?”");
adDomain5
.setImgUrl("http://e.hiphotos.baidu.com/image/w%3D310/sign=66270b4fe8c4b7453494b117fffd1e78/0bd162d9f2d3572c7dad11ba8913632762d0c30d.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:
【【Android|Android UI - 实现广告Banner轮播效果】/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 imageViews;
// 滑动的图片集合 private List dots;
// 图片标题正文的那些点
private List 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 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();
// 点
dots = new ArrayList();
dotList = new ArrayList();
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 getBannerAd() {
List adList = new ArrayList();
AdDomain adDomain = new AdDomain();
adDomain.setId("108078");
adDomain.setDate("3月4日");
adDomain.setTitle("我和令计划只是同姓");
adDomain.setTopicFrom("阿宅");
adDomain.setTopic("我想知道令狐安和令计划有什么关系?");
adDomain.setImgUrl("http://g.hiphotos.baidu.com/image/w%3D310/sign=bb99d6add2c8a786be2a4c0f5708c9c7/d50735fae6cd7b8900d74cd40c2442a7d9330e29.jpg");
adDomain.setAd(false);
adList.add(adDomain);
AdDomain adDomain2 = new AdDomain();
adDomain2.setId("108078");
adDomain2.setDate("3月5日");
adDomain2.setTitle("我和令计划只是同姓");
adDomain2.setTopicFrom("小巫");
adDomain2.setTopic("“我想知道令狐安和令计划有什么关系?”");
adDomain2
.setImgUrl("http://g.hiphotos.baidu.com/image/w%3D310/sign=7cbcd7da78f40ad115e4c1e2672e1151/eaf81a4c510fd9f9a1edb58b262dd42a2934a45e.jpg");
adDomain2.setAd(false);
adList.add(adDomain2);
AdDomain adDomain3 = new AdDomain();
adDomain3.setId("108078");
adDomain3.setDate("3月6日");
adDomain3.setTitle("我和令计划只是同姓");
adDomain3.setTopicFrom("旭东");
adDomain3.setTopic("“我想知道令狐安和令计划有什么关系?”");
adDomain3
.setImgUrl("http://e.hiphotos.baidu.com/image/w%3D310/sign=392ce7f779899e51788e3c1572a6d990/8718367adab44aed22a58aeeb11c8701a08bfbd4.jpg");
adDomain3.setAd(false);
adList.add(adDomain3);
AdDomain adDomain4 = new AdDomain();
adDomain4.setId("108078");
adDomain4.setDate("3月7日");
adDomain4.setTitle("我和令计划只是同姓");
adDomain4.setTopicFrom("小软");
adDomain4.setTopic("“我想知道令狐安和令计划有什么关系?”");
adDomain4
.setImgUrl("http://d.hiphotos.baidu.com/image/w%3D310/sign=54884c82b78f8c54e3d3c32e0a282dee/a686c9177f3e670932e4cf9338c79f3df9dc55f2.jpg");
adDomain4.setAd(false);
adList.add(adDomain4);
AdDomain adDomain5 = new AdDomain();
adDomain5.setId("108078");
adDomain5.setDate("3月8日");
adDomain5.setTitle("我和令计划只是同姓");
adDomain5.setTopicFrom("大熊");
adDomain5.setTopic("“我想知道令狐安和令计划有什么关系?”");
adDomain5
.setImgUrl("http://e.hiphotos.baidu.com/image/w%3D310/sign=66270b4fe8c4b7453494b117fffd1e78/0bd162d9f2d3572c7dad11ba8913632762d0c30d.jpg");
adDomain5.setAd(true);
// 代表是广告
adList.add(adDomain5);
return adList;
}}
源码下载:http://download.csdn.net/detail/wwj_748/8498749
转载请注明:IT_xiao小巫
博客地址:http://blog.csdn.net/wwj_748
移动开发狂热者群:299402133
推荐阅读
- 【Android|Android ViewPager的简单使用
- 【Android|Android Fragment 真正的完全解析(上)
- 【android|Android Https相关完全解析 当OkHttp遇到Https
- 【android|Android OkHttp完全解析 是时候来了解OkHttp了
- 【Android|Android NestedScrolling机制完全解析 带你玩转嵌套滑动
- 【Android|Android 获取本地已安装的应用程序