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