android实现无限轮播

第一种方法用的是ViewPager+Handler 来实现无线轮播；

第二种方式用的是UltraViewPager来实现，用UltraViewPager可以很简单的实现无线或不无线的轮播实现

地址：https://github.com/alibaba/UltraViewPager

1 在ViewPager的适配器中的getCount()长度设置无限大Integer.MAX_VALUE

2  明白当前currentIten 为position % images.length;

3  设置一开始ViewPager的位置 viewPager.setCurrentItem((images.length) * 1000);这样刚开始就可以向左滑动了

4  在OnPageChangeListener ViewPager的滑动监听中设置小点的位置

5  设置Handler 定时滑动开启滑动

6 在onResume中发送空消息，在onPause中移除消息将所有的Callbacks和Messages全部清除掉，避免内存泄露。

如下是主代码 图片是本地的

 package com.demo.sb.main;

 import java.util.ArrayList;
 import com.demo.sb.utils.DensityUtil;
 import com.demo.suibian.R;
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 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.OnClickListener;
 import android.view.View.OnTouchListener;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.LinearLayout;

 public class MActivity_Luenbo extends Activity {

     private ViewPager viewPager;
     private LinearLayout group;
     private int[] images = { R.drawable.a, R.drawable.c, R.drawable.d,
             R.drawable.guide_1, R.drawable.guide_2 };
     private ArrayList<ImageView> mImageViewList;
     private ImageView[] diandian;// ViewPager上的点点
     private int selectedItem = 0;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.onCreate(savedInstanceState);
         setContentView(R.layout.mactivity_luenbo);
         viewPager = (ViewPager) findViewById(R.id.vp_viewPager);
         group = (LinearLayout) findViewById(R.id.ll_viewGroup);
         init();

     }

     @SuppressLint("HandlerLeak")
     private Handler mHandler = new Handler() {
         public void handleMessage(android.os.Message msg) {
             viewPager.setCurrentItem(selectedItem + 1);
             mHandler.sendEmptyMessageDelayed(0, 3000);
         };
     };

     private void init() {
         // TODO Auto-generated method stub
         // 引导3个ViewPager
         mImageViewList = new ArrayList<ImageView>();
         for (int i = 0; i < images.length; i++) {
             ImageView imageView = new ImageView(this);
             imageView.setBackgroundResource(images[i]);
             mImageViewList.add(imageView);
         }

         // 将点点加入到ViewGroup中
         diandian = new ImageView[images.length];
         for (int i = 0; i < images.length; i++) {
             // 循环加入点点图片组
             diandian[i] = new ImageView(this);
             if (i == 0) {
                 diandian[i].setImageResource(R.drawable.page_indicator_focused);
             } else {
                 diandian[i]
                         .setImageResource(R.drawable.page_indicator_unfocused);
             }
             diandian[i].setPadding(8, 8, 8, 8);
             group.addView(diandian[i]);
         }
         viewPager.setAdapter(new GuideAdapter());
         // 设置监听，主要是设置点点的背景
         viewPager.setOnPageChangeListener(new GuidePagerListener());
         // 设置ViewPager的默认项，设置为长度的1000倍，这样开始就能向左滑动了
         viewPager.setCurrentItem((images.length) * 1000);
     }

     /**
      * 每次当onResume有焦点时发送个空消息开始轮播
      */
     @Override
     protected void onResume() {
         // TODO Auto-generated method stub
         super.onResume();
         mHandler.sendEmptyMessageDelayed(0, 2000);
     }

     /**
      * 当暂停时停止轮播
      */
     @Override
     protected void onPause() {
         // TODO Auto-generated method stub
         super.onPause();
         mHandler.removeCallbacksAndMessages(null);
     }

     /**
      * ViewPager的适配器
      *
      */
     private class GuideAdapter extends PagerAdapter {

         @Override
         public int getCount() {
             // TODO Auto-generated method stub
             return Integer.MAX_VALUE;
         }

         @Override
         public boolean isViewFromObject(View arg0, Object arg1) {
             // TODO Auto-generated method stub
             return arg0 == arg1;
         }

         // @Override
         // public void destroyItem(View container, int position, Object object)
         // {
         // // TODO Auto-generated method stub
         // ((ViewGroup) container).removeView(images[position
         // % images.length]);
         // }
         @Override
         public void destroyItem(ViewGroup container, int position, Object object) {
             // TODO Auto-generated method stub
             container.removeView((View) object);
         }

         /**
          * 加载图片进去，用当前的position除以图片数组长度取余数是关键
          */
         @Override
         public Object instantiateItem(ViewGroup container, int position) {
             // TODO Auto-generated method stub
             final int currentIten = position % images.length;
             ImageView iView = mImageViewList.get(currentIten);
             try {

                 if (iView.getParent() == null) {
                     container.addView(iView);
                 }
                 iView.setOnClickListener(new OnClickListener() {

                     @Override
                     public void onClick(View arg0) {
                         // TODO Auto-generated method stub
                         DensityUtil.showToast(MActivity_Luenbo.this,
                                 currentIten + "");
                     }
                 });
                 iView.setOnTouchListener(new NewTouchListener());
             } catch (Exception e) {
                 // TODO: handle exception
             }

             return iView;
         }

     }

     /**
      * ViewPager 的滑动监听
      *
      * @author Administrator
      *
      */
     private class GuidePagerListener implements OnPageChangeListener {

         @Override
         public void onPageScrollStateChanged(int arg0) {
             // TODO Auto-generated method stub

         }

         @Override
         public void onPageScrolled(int arg0, float arg1, int arg2) {
             // TODO Auto-generated method stub
             System.out.println(arg0 + "  dd " + arg1 + "  dddd  " + arg2);
         }

         @Override
         public void onPageSelected(int position) {
             // TODO Auto-generated method stub
             selectedItem = position;
             System.out.println("第几个页面" + position + "  " + position
                     % mImageViewList.size());
             for (int i = 0; i < diandian.length; i++) {
                 if (i == position % images.length) {
                     diandian[i]
                             .setImageResource(R.drawable.page_indicator_focused);
                 } else {
                     diandian[i]
                             .setImageResource(R.drawable.page_indicator_unfocused);
                 }
             }
         }

     }

     /**
      * ViewPager的触摸事件当按下图片停止轮播
      *
      * @author Administrator
      *
      */
     private class NewTouchListener implements OnTouchListener {

         @Override
         public boolean onTouch(View arg0, MotionEvent arg1) {
             // TODO Auto-generated method stub
             switch (arg1.getAction()) {
             case MotionEvent.ACTION_DOWN:
                 mHandler.removeCallbacksAndMessages(null);
                 break;
             case MotionEvent.ACTION_CANCEL:
                 mHandler.sendEmptyMessageDelayed(0, 3000);
                 break;
             case MotionEvent.ACTION_UP:
                 mHandler.sendEmptyMessageDelayed(0, 3000);
                 break;
             default:
                 break;
             }
             return true;
         }

     }

 }

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >

     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:padding="10dp"
         android:text="@string/luenbo"
         android:textColor="#f00" />

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

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

         <RelativeLayout
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="bottom|center"
             android:layout_marginBottom="20dp" >

             <LinearLayout
                 android:id="@+id/ll_viewGroup"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:orientation="horizontal" />
         </RelativeLayout>

     </FrameLayout>

 </LinearLayout>

第二种方式：

compile('com.alibaba.android:ultraviewpager:1.0.4@aar') {
    transitive = true
}

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context="com.xieer.citybike.app.activity.guide.GuideActivity">

    <com.tmall.ultraviewpager.UltraViewPager
        android:id="@+id/ultra_viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/darker_gray" />

    <Button
        android:id="@+id/guide_start"
        android:layout_width="90dp"
        android:layout_height="40dp"
        android:background="#FCCCC7"
        android:textSize="12sp"
        android:textColor="#D0525D"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="50dp"
        android:text="开始骑行吧"
        android:visibility="gone" />
</RelativeLayout>

import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import com.tmall.ultraviewpager.UltraViewPager;
import com.xieer.citybike.app.MainActivity;
import com.xieer.citybike.app.R;
import com.xieer.citybike.app.adapter.PageMyAdapter;
import com.xieer.citybike.app.utils.common.ToastUtils;

import java.util.ArrayList;

/**
 * 引导页面
 * 使用UltraViewPager 来实现的轮播效果
 * https://github.com/alibaba/UltraViewPager
 */
public class GuideActivity extends AppCompatActivity {
    private SharedPreferences sPreferences;
    private ArrayList<ImageView> mdata;
    private static final int[] mImageIds = new int[]{R.drawable.guide_1,R.drawable.guide_2,R.drawable.guide_3};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_guide);
        mdata = new ArrayList<>();
        for(int i=0;i<mImageIds.length;i++){
            ImageView imageView = new ImageView(this);
            imageView.setBackgroundResource(mImageIds[i]);
            mdata.add(imageView);
        }
        sPreferences = getSharedPreferences("info",MODE_PRIVATE);
        final Button btn_start = (Button)findViewById(R.id.guide_start);
        UltraViewPager ultraViewPager = (UltraViewPager)findViewById(R.id.ultra_viewpager);
        ultraViewPager.setScrollMode(UltraViewPager.ScrollMode.HORIZONTAL);
        PagerAdapter adapter = new PageMyAdapter(this,mdata);
        ultraViewPager.setAdapter(adapter);
        //设置indicator样式
        ultraViewPager.initIndicator();
        ultraViewPager.getIndicator().setOrientation(UltraViewPager.Orientation.HORIZONTAL)
                .setFocusColor(Color.GREEN)
                .setNormalColor(Color.WHITE)
                .setMargin(0,0,0, ToastUtils.dp2px(this,10))
                .setRadius((int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,ToastUtils.dp2px(this,4),this.getResources().getDisplayMetrics()));
        ultraViewPager.getIndicator().setGravity(Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM);
        ultraViewPager.getIndicator().build();
        ultraViewPager.setInfiniteLoop(false);
        ultraViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){
            @Override
            public void onPageSelected(int position) {
                super.onPageSelected(position);
                if(position == mdata.size() - 1){
                   btn_start.setVisibility(View.VISIBLE);
                }else {
                    btn_start.setVisibility(View.GONE);
                }
            }
        });
        btn_start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                sPreferences.edit().putBoolean("isLoad",false).commit();
                startActivity(new Intent(GuideActivity.this, MainActivity.class));
                finish();
            }
        });
    }
}