Android UI - 实现广告Banner轮播效果
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转载自http://blog.csdn.net/wwj_748/article/details/44243053
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:
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
[html] view plain copy
- <?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="我和令计划只是同姓"
- 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="“我想知道令狐安和令计划有什么关系?”"
- 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
[html] view plain copy
- <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
[html] view plain copy
- <?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
[html] view plain copy
- <?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[java] view plain copy
- 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
[java] view plain copy
- 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
[java] view plain copy
- 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
[java] view plain copy
- 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
[java] view plain copy
- /**
- * 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:
/BannerAutoScrollDemo/src/com/xiaowu/banner/demo/MainActivity.Java
[java] view plain copy
- 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;
- }
- }
0 0
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