Android使用ViewPager实现无限循环滑动及轮播(附源代码)

MainActivity例如以下:

package cc.ww;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
/**
 * 
 * Demo描写叙述:
 * 1 ViewPager的自己主动轮播
 * 2 同一时候支持手动切换ViewPager的Item
 * 3 攻克了当图片小于三张ViewPager轮播时崩溃的问题
 */
public class MainActivity extends Activity {
    private Context mContext;
    private Handler mHandler;
    private Runnable mRunnable;
    private ViewPager mViewPager;
    private int viewPagerItemSize=0;
    private ImageView[] dotImageViews;
    private final int INTERVAL =1000 * 3;
    private ArrayList<Integer> mArrayList;
    private LinearLayout mDotsLinearLayout;
    private final static int SET_VIEWPAGER_ITEM=9527;
    private LauncherViewPagerAdapter mViewPagerAdapter;
    private PageChangeListenerImpl mPageChangeListenerImpl;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //去掉状态栏
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                             WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);
        init();
    }


    //初始化
    private void init() {
        initData();
        if(viewPagerItemSize>0){
            initDots();
            initViewPager();
            setAutoChangeViewPager();
        }
    }


    //准备ViewPager将显示的数据
    private void initData(){
        mContext = this;
        mArrayList=new ArrayList<Integer>();
        mArrayList.add(R.drawable.a);
        mArrayList.add(R.drawable.b);
        mArrayList.add(R.drawable.c);
        mArrayList.add(R.drawable.d);
        viewPagerItemSize=mArrayList.size();
    }


    //初始化ViewPager
    private void initViewPager(){
        mViewPager = (ViewPager) findViewById(R.id.guide_viewpager);
        mViewPagerAdapter = new LauncherViewPagerAdapter(mContext);
        mViewPagerAdapter.setAdapterData(mArrayList);
        mViewPager.setAdapter(mViewPagerAdapter);
        int currentItem = Integer.MAX_VALUE/2 - Integer.MAX_VALUE/2 % viewPagerItemSize;
        mViewPager.setCurrentItem(currentItem);
        setdotImageViews(currentItem%viewPagerItemSize);
        mViewPager.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View arg0, MotionEvent arg1) {
                mViewPager.requestDisallowInterceptTouchEvent(true);
                return false;
            }
        });
    }


    //初始化底部小圆点
    private void initDots() {
        mDotsLinearLayout = (LinearLayout) findViewById(R.id.dotsLinearLayout);
        dotImageViews = new ImageView[viewPagerItemSize];
        for (int i = 0; i < dotImageViews.length; i++) {
            LinearLayout layout = new LinearLayout(mContext);
            ImageView imageView = new ImageView(mContext);
            imageView.setLayoutParams(new ViewGroup.LayoutParams(20, 20));
            if (i == 0) {
                imageView.setBackgroundResource(R.drawable.guide_dot_white);
            } else {
                layout.setPadding(20, 0, 0, 0);
                imageView.setBackgroundResource(R.drawable.guide_dot_black);
            }
            dotImageViews[i] = imageView;
            layout.addView(imageView);
            mDotsLinearLayout.addView(layout);
        }
    }


    //开启ViewPager的自己主动轮播
    @SuppressWarnings("deprecation")
    private void setAutoChangeViewPager() {
        mPageChangeListenerImpl = new PageChangeListenerImpl();
        mViewPager.setOnPageChangeListener(mPageChangeListenerImpl);

        mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                switch (msg.what) {
                case SET_VIEWPAGER_ITEM:
                    if (mViewPager != null && mViewPagerAdapter != null) {
                        int currentItemIndex = mViewPager.getCurrentItem();
                        int itemsCount = mViewPagerAdapter.getCount();
                        if ((currentItemIndex + 1) < itemsCount) {
                            mViewPager.setCurrentItem(currentItemIndex + 1, true);
                        } else {
                            mViewPager.setCurrentItem(0, false);
                        }
                    }
                    break;
                }
            }
        };

        mRunnable = new Runnable() {
            @Override
            public void run() {
                Message message = mHandler.obtainMessage();
                message.what = SET_VIEWPAGER_ITEM;
                mHandler.sendMessage(message);
                mHandler.removeCallbacks(mRunnable);
                mHandler.postDelayed(this, INTERVAL);
            }
        };

        mHandler.postDelayed(mRunnable, INTERVAL);
    }


    //设置小圆点的显示
    private void setdotImageViews(int selected){
         for (int i = 0; i < dotImageViews.length; i++) {
             dotImageViews[selected].setBackgroundResource(R.drawable.guide_dot_white);
             if (selected != i) {
                 dotImageViews[i].setBackgroundResource(R.drawable.guide_dot_black);
             }
         }
    }

    //ViewPager翻页后更新小圆点的显示
    private class PageChangeListenerImpl implements ViewPager.OnPageChangeListener {
        @Override
        public void onPageSelected(int selected) {
             setdotImageViews(selected % viewPagerItemSize);
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(null!=mViewPager){
            mViewPager.removeAllViews();
            mViewPager = null;
        }
    }

}

LauncherViewPagerAdapter例如以下:

package cc.ww;

import java.util.ArrayList;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;

public class LauncherViewPagerAdapter extends PagerAdapter {
  private Context mContext;
  private ArrayList<Integer> pagesArrayList;
  private View itemView;

  public LauncherViewPagerAdapter(Context context) {
    this.mContext = context;
  }

  /**
   * 设置ViewPager将要显示的数据.
   * 当图片数量小于三张的时候,通过复制组拼数据
   */
  public void setAdapterData(ArrayList<Integer> arrayList){
    pagesArrayList=arrayList;
    if (pagesArrayList.size()<1) {
      Toast.makeText(mContext, "ViewPager item size=0", Toast.LENGTH_LONG).show();
    }else if(pagesArrayList.size()<2){
       pagesArrayList.add(pagesArrayList.get(0));
       pagesArrayList.add(pagesArrayList.get(0));
       pagesArrayList.add(pagesArrayList.get(0));
    }else if(pagesArrayList.size()<3){
      pagesArrayList.add(pagesArrayList.get(0));
      pagesArrayList.add(pagesArrayList.get(1));
    }
    System.out.println("-----> PagerAdapter中item的个数="+pagesArrayList.size());
  }


  @Override
  public int getCount() {
     return Integer.MAX_VALUE;
  }


  @Override
  public Object instantiateItem(ViewGroup container, int position) {
     if (pagesArrayList.size() > 0) {
      itemView=LayoutInflater.from(mContext).inflate(R.layout.guide_pager_adapter, null);
        itemView.setFocusable(true);
        ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);
        imageView.setBackgroundResource(pagesArrayList.get(position%pagesArrayList.size()));
        container.addView(itemView);
        return itemView;
         }
         return null;

  }


  @Override
  public boolean isViewFromObject(View arg0, Object arg1) {
    return arg0 == arg1;
  }

  @Override
  public void destroyItem(ViewGroup container, int position, Object object) {
     container.removeView((View) object);
  }
}

activity_main.xml例如以下:

<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">

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

    <LinearLayout
        android:id="@+id/dotsLinearLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="100px"
        android:layout_centerHorizontal="true"
        android:orientation="horizontal">
    </LinearLayout>



</RelativeLayout>

guide_pager_adapter.xml例如以下:

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

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

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