ViewPager左右輪滑

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;

    /**
     * 裝點點的ImageView數組
     */
    private ImageView[] tips;

    /**
     * 裝ImageView數組
     */
    private ImageView[] mImageViews;

    /**
     * 圖片資源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);

        //載入圖片資源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};


        //將點點加入到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);
        }


        //將圖片裝載到數組中
        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]);
        }

        //設置Adapter
        viewPager.setAdapter(new MyAdapter());
        //設置監聽，主要是設置點點的背景
        viewPager.setOnPageChangeListener(this);
        //設置ViewPager的默認項, 設置爲長度的100倍，這樣子開始就能往左滑動
        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]);

        }

        /**
         * 載入圖片進去，用當前的position 除以 圖片數組長度取餘數是關鍵
         */
        @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);
    }

    /**
     * 設置選中的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);
            }
        }
    }

}



ViewPageAdapter
 package com.tree.schoollife.adapter;import android.support.v4.view.PagerAdapter;import android.view.View;import android.view.ViewGroup;import android.view.ViewParent;import android.widget.ImageView;import java.util.List;/** * Created by tree on 2016/11/10. */public class ViewPagerAdapter extends PagerAdapter {    private List<ImageView> mData;    public ViewPagerAdapter(List<ImageView> mData) {        this.mData = mData;    }        @Override    public int getCount() {        return Integer.MAX_VALUE;    }    @Override    public Object instantiateItem(ViewGroup container, int position) {        //對ViewPager頁號求模取出View列表中要顯示的項        position %= mData.size();        if (position<0){            position = mData.size()+position;        }        ImageView view = mData.get(position);        //若是View已經在以前添加到了一個父組件，則必須先remove，不然會拋出IllegalStateException。        ViewParent vp =view.getParent();        if (vp!=null){            ViewGroup parent = (ViewGroup)vp;            parent.removeView(view);        }        container.addView(view);        //add listeners here if necessary        return view;    }        @Override    public void destroyItem(ViewGroup container, int position, Object object) {        //Warning：不要在這裏調用removeView    }       @Override    public boolean isViewFromObject(View view, Object object) {        return view==object;    }}