ViewPager—02图片无限轮播

布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="200dp" >

        <android.support.v4.view.ViewPager
            android:id="@+id/vp"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <LinearLayout
            android:id="@+id/ll_point"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerInParent="true"
            android:layout_marginBottom="20dp"
            android:orientation="horizontal" />
    </RelativeLayout>

</RelativeLayout>

相关代码

 public class MainActivity extends Activity {

     private ViewPager mViewPager;
     private LinearLayout mLlPoint;
     private MyAdapter mAdapter;

     private int[] ids = {R.drawable.a1,R.drawable.a2,R.drawable.a3};
     private List<ImageView> mImages;
     private int lastPos;
     private boolean isRunning;

     private Handler mHandler = new Handler() {
         public void handleMessage(android.os.Message msg) {
             switch(msg.what){
             case 0:

                 mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1);

                 if (isRunning) {
                     mHandler.sendEmptyMessageDelayed(0,3000);
                 }

                 break;

             default:
                 break;
             }
         };
     };

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         initView();
         initData();

         mAdapter = new MyAdapter();
         mViewPager.setAdapter(mAdapter);
         mViewPager.addOnPageChangeListener(new PagerChnageListener());
         mViewPager.setCurrentItem((mImages.size()) * 1000);

         isRunning = true;
         mHandler.sendEmptyMessageDelayed(0,3000);
     }

     private void initView() {
         mViewPager = (ViewPager)findViewById(R.id.vp);
         mLlPoint = (LinearLayout)findViewById(R.id.ll_point);
     }

     private void initData() {

         mImages = new ArrayList<ImageView>();

         for (int i = 0;i < ids.length;i++) {
             ImageView iv = new ImageView(this);
             iv.setBackgroundResource(ids[i]);
             mImages.add(iv);

             View view = new View(this);
             view.setBackgroundResource(R.drawable.point_selector);
             LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(Utils.dip2px(this,10),
                     Utils.dip2px(this,10));
             if (i != 0) {
                 params.leftMargin = 20;
                 view.setEnabled(false);
             }else {
                 view.setEnabled(true);
             }
             view.setLayoutParams(params);
             mLlPoint.addView(view);
         }
     }

     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 Object instantiateItem(ViewGroup container,int position) {
             ImageView view = mImages.get(position % mImages.size());

             // 增加异常扑捉防止空白页
             try {
                 ((ViewPager)container).addView(view,0);
             }catch(Exception e) {
                 e.printStackTrace();
             }
             return view;
         }

         @Override
         public void destroyItem(ViewGroup container,int position,Object object) {
             // 防止2/3个出现BUG
             // container.removeView(mImages.get(position % mImages.size()));
         }
     }

     class PagerChnageListener implements OnPageChangeListener {

         /* state: 0空闲，1是滑行中，2加载完毕 */
         @Override
         public void onPageScrollStateChanged(int state) {
             switch(state){
             case 0:
                 isRunning = true;
                 break;
             case 1:
                 isRunning = false;
                 break;
             case 2:
                 isRunning = true;
                 break;

             default:
                 break;
             }
         }

         @Override
         public void onPageScrolled(int position,float positionOffset,int positionOffsetPixels) {

         }

         @Override
         public void onPageSelected(int position) {
             int pos = position % mImages.size();
             mLlPoint.getChildAt(lastPos).setEnabled(false);
             mLlPoint.getChildAt(pos).setEnabled(true);
             lastPos = pos;
         }
     }

     @Override
     protected void onDestroy() {
         super.onDestroy();
         isRunning = false;
         mHandler.removeCallbacksAndMessages(null);
     }
 }

 

 效果图