ViewPager这个小demo实现的是可以左右循环滑动图片，下面带索引，滑到最后一页在往右滑动就要第一页，第一页往左滑动就到最后一页，先上效果图，用美女图片是我一贯的作风，呵呵

1.    首先看一些layout下的xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >       <android.support.v4.view.ViewPager          android:id="@+id/viewPager"          android:layout_width="fill_parent"          android:layout_height="wrap_content" />             <RelativeLayout          android:layout_width="fill_parent"          android:layout_height="wrap_content"         android:orientation="vertical" >            <LinearLayout              android:id="@+id/viewGroup"              android:layout_width="fill_parent"              android:layout_height="wrap_content"              android:layout_alignParentBottom="true"             android:layout_marginBottom="30dp"              android:gravity="center_horizontal"              android:orientation="horizontal" >          </LinearLayout>      </RelativeLayout>  </FrameLayout>

使用ViewPager首先需要引入android-support-v4.jar这个jar包。自己不要忘记加

package com.example.viewpagerdemo;import android.app.Activity;import android.os.Bundle;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.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.widget.ImageView;import android.widget.LinearLayout;public class TwoActivity extends Activity implements OnPageChangeListener{	/**	 * ViewPager	 */	private ViewPager viewPager;		/**	 * 装点点的ImageView数组	 */	private ImageView[] tips;		/**	 * 装ImageView数组	 */	private ImageView[] mImageViews;		/**	 * 图片资源id	 */	private int[] imgIdArray ;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		ViewGroup group = (ViewGroup)findViewById(R.id.viewGroup);		viewPager = (ViewPager) findViewById(R.id.viewPager);				//载入图片资源ID		imgIdArray = new int[]{R.drawable.item01, R.drawable.item02, R.drawable.item03, R.drawable.item04,				R.drawable.item05,R.drawable.item06, R.drawable.item07, R.drawable.item08};						//将点点加入到ViewGroup中		tips = new ImageView[imgIdArray.length];		for(int i=0; i<tips.length; i++){			ImageView imageView = new ImageView(this);	    	imageView.setLayoutParams(new LayoutParams(10,10));	    	tips[i] = imageView;	    	if(i == 0){	    		tips[i].setBackgroundResource(R.drawable.page_indicator_focused);	    	}else{	    		tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);	    	}	    		    	LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,                      LayoutParams.WRAP_CONTENT));	    	layoutParams.leftMargin = 5;	    	layoutParams.rightMargin = 5;	    	group.addView(imageView, layoutParams);		}						//将图片装载到数组中		mImageViews = new ImageView[imgIdArray.length];		for(int i=0; i<mImageViews.length; i++){			ImageView imageView = new ImageView(this);			mImageViews[i] = imageView;			imageView.setBackgroundResource(imgIdArray[i]);		}				//设置Adapter		viewPager.setAdapter(new MyAdapter());		//设置监听，主要是设置点点的背景		viewPager.setOnPageChangeListener(this);		//设置ViewPager的默认项, 设置为长度的100倍，这样子开始就能往左滑动		viewPager.setCurrentItem((mImageViews.length) * 100);			}		/**	 * 	 * @author xiaanming	 *	 */	public class MyAdapter extends PagerAdapter{		@Override		public int getCount() {			return Integer.MAX_VALUE;		}		@Override		public boolean isViewFromObject(View arg0, Object arg1) {			return arg0 == arg1;		}		@Override		public void destroyItem(View container, int position, Object object) {			((ViewPager)container).removeView(mImageViews[position % mImageViews.length]);					}		/**		 * 载入图片进去，用当前的position 除以 图片数组长度取余数是关键		 */		@Override		public Object instantiateItem(View container, int position) {			((ViewPager)container).addView(mImageViews[position % mImageViews.length], 0);			return mImageViews[position % mImageViews.length];		}							}	@Override	public void onPageScrollStateChanged(int arg0) {			}	@Override	public void onPageScrolled(int arg0, float arg1, int arg2) {			}	@Override	public void onPageSelected(int arg0) {		setImageBackground(arg0 % mImageViews.length);	}		/**	 * 设置选中的tip的背景	 * @param selectItems	 */	private void setImageBackground(int selectItems){		for(int i=0; i<tips.length; i++){			if(i == selectItems){				tips[i].setBackgroundResource(R.drawable.page_indicator_focused);			}else{				tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);			}		}	}}

代码下载

上面的代码中，当只有3张图片或者2张图片的时候，滑动存在BUG问题的修改如下

• destroyItem(View container, int position, Object object)方法中不removeView

	@Override		public void destroyItem(View container, int position, Object object) {//			((ViewPager)container).removeView(mImageViews[position % mImageViews.length]);		}

• instantiateItem(View container, int position)增加异常扑捉

	@Override		public Object instantiateItem(View container, int position) {			try {  				((ViewPager)container).addView(mImageViews[position % mImageViews.length], 0);			}catch(Exception e){				//handler something			}			return mImageViews[position % mImageViews.length];		}