Android利用ViewPager实现滑动广告板

•android-support-v4.jar,这是谷歌官方 给我们提供的一个兼容低版本Android设备的软件包，里面包囊了只有在Android3.0以上可以使用的api。而ViewPager就是其中之 一,利用它我们可以做很多事情，从最简单的导航，到页面切换菜单等等。

•ViewPager的功能就是可以使视图滑动，就像Lanucher左右滑动那样。

•本Demo向大家演示ViewPager的使用，并在用户未滑动View时，每隔5s钟自动切换到下一个View(循环切换)，而当用户有Touch到View时取消5s自动切换功能。并有指示器指示当前处于哪一个View。

 

下面是运行的截图：

 

这个是非常常见的应用

下面给出实现的代码：

1.源文件

 ackage com.eyeandroid.viewpager;  

 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;  

 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 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.MotionEvent;
 import android.view.View;
 import android.view.View.OnTouchListener;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 import android.widget.ImageView;  

 @SuppressLint("HandlerLeak")
 public class MainActivity extends Activity {
     private ImageView[] imageViews = null;
     private ImageView imageView = null;
     private ViewPager advPager = null;
     private AtomicInteger what = new AtomicInteger(0);
     private boolean isContinue = true;  

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         initViewPager();
     }  

     private void initViewPager() {
         advPager = (ViewPager) findViewById(R.id.adv_pager);
         ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup);  

 //      这里存放的是四张广告背景
         List<View> advPics = new ArrayList<View>();  

         ImageView img1 = new ImageView(this);
         img1.setBackgroundResource(R.drawable.advertising_default_1);
         advPics.add(img1);  

         ImageView img2 = new ImageView(this);
         img2.setBackgroundResource(R.drawable.advertising_default_2);
         advPics.add(img2);  

         ImageView img3 = new ImageView(this);
         img3.setBackgroundResource(R.drawable.advertising_default_3);
         advPics.add(img3);  

         ImageView img4 = new ImageView(this);
         img4.setBackgroundResource(R.drawable.advertising_default);
         advPics.add(img4);  

 //      对imageviews进行填充
         imageViews = new ImageView[advPics.size()];
 //小图标
         for (int i = 0; i < advPics.size(); i++) {
             imageView = new ImageView(this);
             imageView.setLayoutParams(new LayoutParams(20, 20));
             imageView.setPadding(5, 5, 5, 5);
             imageViews[i] = imageView;
             if (i == 0) {
                 imageViews[i]
                         .setBackgroundResource(R.drawable.banner_dian_focus);
             } else {
                 imageViews[i]
                         .setBackgroundResource(R.drawable.banner_dian_blur);
             }
             group.addView(imageViews[i]);
         }  

         advPager.setAdapter(new AdvAdapter(advPics));
         advPager.setOnPageChangeListener(new GuidePageChangeListener());
         advPager.setOnTouchListener(new OnTouchListener() {  

             @Override
             public boolean onTouch(View v, MotionEvent event) {
                 switch (event.getAction()) {
                 case MotionEvent.ACTION_DOWN:
                 case MotionEvent.ACTION_MOVE:
                     isContinue = false;
                     break;
                 case MotionEvent.ACTION_UP:
                     isContinue = true;
                     break;
                 default:
                     isContinue = true;
                     break;
                 }
                 return false;
             }
         });
         new Thread(new Runnable() {  

             @Override
             public void run() {
                 while (true) {
                     if (isContinue) {
                         viewHandler.sendEmptyMessage(what.get());
                         whatOption();
                     }
                 }
             }  

         }).start();
     }  

     private void whatOption() {
         what.incrementAndGet();
         if (what.get() > imageViews.length - 1) {
             what.getAndAdd(-4);
         }
         try {
             Thread.sleep(5000);
         } catch (InterruptedException e) {  

         }
     }  

     private final Handler viewHandler = new Handler() {  

         @Override
         public void handleMessage(Message msg) {
             advPager.setCurrentItem(msg.what);
             super.handleMessage(msg);
         }  

     };  

     private final class GuidePageChangeListener implements OnPageChangeListener {  

         @Override
         public void onPageScrollStateChanged(int arg0) {  

         }  

         @Override
         public void onPageScrolled(int arg0, float arg1, int arg2) {  

         }  

         @Override
         public void onPageSelected(int arg0) {
             what.getAndSet(arg0);
             for (int i = 0; i < imageViews.length; i++) {
                 imageViews[arg0]
                         .setBackgroundResource(R.drawable.banner_dian_focus);
                 if (arg0 != i) {
                     imageViews[i]
                             .setBackgroundResource(R.drawable.banner_dian_blur);
                 }
             }  

         }  

     }  

     private final class AdvAdapter extends PagerAdapter {
         private List<View> views = null;  

         public AdvAdapter(List<View> views) {
             this.views = views;
         }  

         @Override
         public void destroyItem(View arg0, int arg1, Object arg2) {
             ((ViewPager) arg0).removeView(views.get(arg1));
         }  

         @Override
         public void finishUpdate(View arg0) {  

         }  

         @Override
         public int getCount() {
             return views.size();
         }  

         @Override
         public Object instantiateItem(View arg0, int arg1) {
             ((ViewPager) arg0).addView(views.get(arg1), 0);
             return views.get(arg1);
         }  

         @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) {  

         }  

     }  

 }  

2.布局文件

这个文件在屏幕上的图片显示具有至关重要的作用

 <?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:orientation="vertical" >  

     <RelativeLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:orientation="vertical" >
         <!-- ViewPager是一个控件 -->
         <android.support.v4.view.ViewPager
             android:id="@+id/adv_pager"
             android:layout_width="fill_parent"
             android:layout_height="160dp" >  

         </android.support.v4.view.ViewPager>
         <LinearLayout
             android:id="@+id/viewGroup"
             android:layout_below="@id/adv_pager"
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
             android:layout_marginTop="-25px"
             android:gravity="right"
             android:orientation="horizontal" >
         </LinearLayout>
     </RelativeLayout>  

 </LinearLayout>  

原博客地址：http://blog.csdn.net/dlutbrucezhang/article/details/8736807