本例是用ViewPager去做的实现，支持自动滑动和手动滑动，不仅优酷网，实际上有很多商城和门户网站都有类似的实现:
具体思路：
1. 工程中需要添加android-support-v4.jar,才能使用ViewPager控件.
2. 图片的自动切换: 可使用Timer或者ScheduledExecutorService,这个有多重方式可以实现.
同时要切换底部的dots（园点）
3.Handler+Message机制更新UI,这个相信大家都很熟练，不再描述
4. 实现的一些细节:注意本例中的优化：图片的自动切换启动了其他的线程，要在Activity在可见到不可见的状态,也就是在onStop()方法中将线程停止，在onStart()方法中开启线程。否则，Timer没有停止，或者反复开启，会引起较大的内存消耗，时间一长就程序就会崩掉。 还有，就是在跳转到其他Activity的过程中会出现画面的卡顿
下面看一下效果图和具体代码:
工程结构如下图所示：
main.xml:
[java] view plaincopy
<p>
</p><p><strong>然后是具体的布局文件及代码实现:</strong></p><p>main.xml:</p>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFFFFF"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="40dip"
android:background="@drawable/title_bk" >
<ImageButton
android:id="@+id/btn_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/btn_back_selector"
android:src="@drawable/btn_back" />
<View
android:id="@+id/line0"
android:layout_width="1px"
android:layout_height="fill_parent"
android:layout_toRightOf="@id/btn_back"
android:background="#aa11264f" />
<View
android:layout_width="1px"
android:layout_height="fill_parent"
android:layout_toRightOf="@id/line0"
android:background="#009ad6" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="优酷客户端"
android:textColor="#FFFFFF"
android:textSize="20sp" />
</RelativeLayout>
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="140dip" >
<android.support.v4.view.ViewPager
android:id="@+id/vp"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="35dip"
android:layout_gravity="bottom"
android:background="#33000000"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="中国家庭院校园区域名字体现"
android:textColor="#ffffff" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="3dip"
android:gravity="center" >
<View
android:id="@+id/v_dot0"
style="@style/dot_style"
android:background="@drawable/dot_focused" />
<View
android:id="@+id/v_dot1"
style="@style/dot_style" />
<View
android:id="@+id/v_dot2"
style="@style/dot_style" />
<View
android:id="@+id/v_dot3"
style="@style/dot_style" />
<View
android:id="@+id/v_dot4"
style="@style/dot_style" />
</LinearLayout>
</LinearLayout>
</FrameLayout>
</LinearLayout>
MyViewPagerActivity:
[java] view plaincopy
package com.tony.viewpager; 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.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.widget.ImageView; import android.widget.ImageView.ScaleType; import android.widget.TextView; /** * 仿优酷Android客户端图片左右滑动 * */ public class MyViewPagerActivity extends Activity { private ViewPager viewPager; // android-support-v4中的滑动组件 private List<ImageView> imageViews; // 滑动的图片集合 private String[] titles; // 图片标题 private int[] imageResId; // 图片ID private List<View> dots; // 图片标题正文的那些点 private TextView tv_title; private int currentItem = 0; // 当前图片的索引号 // An ExecutorService that can schedule commands to run after a given delay, // or to execute periodically. private ScheduledExecutorService scheduledExecutorService; // 切换当前显示的图片 private Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { viewPager.setCurrentItem(currentItem);// 切换当前显示的图片 }; }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); imageResId = new int[] { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e }; titles = new String[imageResId.length]; titles[0] = "巩俐不低俗，我就不能低俗"; titles[1] = "扑树又回来啦！再唱经典老歌引万人大合唱"; titles[2] = "揭秘北京电影如何升级"; titles[3] = "乐视网TV版大派送"; titles[4] = "热血屌丝的反杀"; imageViews = new ArrayList<ImageView>(); // 初始化图片资源 for (int i = 0; i < imageResId.length; i++) { ImageView imageView = new ImageView(this); imageView.setImageResource(imageResId[i]); imageView.setScaleType(ScaleType.CENTER_CROP); imageViews.add(imageView); } dots = new ArrayList<View>(); dots.add(findViewById(R.id.v_dot0)); dots.add(findViewById(R.id.v_dot1)); dots.add(findViewById(R.id.v_dot2)); dots.add(findViewById(R.id.v_dot3)); dots.add(findViewById(R.id.v_dot4)); tv_title = (TextView) findViewById(R.id.tv_title); tv_title.setText(titles[0]);// viewPager = (ViewPager) findViewById(R.id.vp); viewPager.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 viewPager.setOnPageChangeListener(new MyPageChangeListener()); } @Override protected void onStart() { scheduledExecutorService = Executors.newSingleThreadScheduledExecutor(); // 当Activity显示出来后，每两秒钟切换一次图片显示 scheduledExecutorService.scheduleAtFixedRate(new ScrollTask(), 1, 2, TimeUnit.SECONDS); super.onStart(); } @Override protected void onStop() { // 当Activity不可见的时候停止切换 scheduledExecutorService.shutdown(); super.onStop(); } /** * 换行切换任务 * * @author Administrator * */ private class ScrollTask implements Runnable { public void run() { synchronized (viewPager) { System.out.println("currentItem: " + currentItem); currentItem = (currentItem + 1) % imageViews.size(); handler.obtainMessage().sendToTarget(); // 通过Handler切换图片 } } } /** * 当ViewPager中页面的状态发生改变时调用 * * @author Administrator * */ private class MyPageChangeListener implements OnPageChangeListener { private int oldPosition = 0; /** * This method will be invoked when a new page becomes selected. * position: Position index of the new selected page. */ public void onPageSelected(int position) { currentItem = position; tv_title.setText(titles[position]); dots.get(oldPosition).setBackgroundResource(R.drawable.dot_normal); dots.get(position).setBackgroundResource(R.drawable.dot_focused); oldPosition = position; } public void onPageScrollStateChanged(int arg0) { } public void onPageScrolled(int arg0, float arg1, int arg2) { } } /** * 填充ViewPager页面的适配器 * * @author Administrator * */ private class MyAdapter extends PagerAdapter { @Override public int getCount() { return imageResId.length; } @Override public Object instantiateItem(View arg0, int arg1) { ((ViewPager) arg0).addView(imageViews.get(arg1)); return imageViews.get(arg1); } @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) { } } }
Drawable目录下
btn_back_selector.xml:
[java] view plaincopy
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/btn_top_pressed" android:state_focused="true"></item> <item android:drawable="@drawable/btn_top_pressed" android:state_pressed="true"></item> <item android:drawable="@drawable/btn_top_pressed" android:state_selected="true"></item> <item android:drawable="@drawable/title_bk"></item> </selector> btn_top_pressed.xml: [java] view plaincopy <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" > <gradient android:angle="270" android:endColor="#009ad6" android:startColor="#11264f" /> </shape>
dot_focused.xml:
[java] view plaincopy
<?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>
dot_normal.xml:
[java] view plaincopy
<?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>
title_bk.xml:
[java] view plaincopy
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<gradient
android:angle="270"
android:endColor="#11264f"
android:startColor="#009ad6" />
</shape>
源码下载地址:
