Android 利用ViewPager实现图片可以左右循环滑动效果附代码下载

<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> 

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);  }  }  } } 

 @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[java] view plaincopy在CODE上查看代码片派生到我的代码片@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];  }