ViewPager图片滑动轮换

 

package com.example.viewpagerdemo;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

/**
 * 注：至少需要4张图片才可以正常左右轮换<br>
 * 
 * ViewPager 图片轮换切换 <br>
 * 以及<br>
 * ViewPager 图片通用切换<br> 
 */
public class ThreeActivity extends Activity {
    private List<View> views = new ArrayList<View>();
    private ViewPager viewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_three);
        viewPager = (ViewPager) findViewById(R.id.viewPager);
        // views还没有数据
        getViews();
        viewPager.setAdapter(new MyViewPagerAdapter());
        viewPager.setCurrentItem(views.size() * 100);
    }

    private void getViews() {
        ImageView img1 = new ImageView(this);
        img1.setImageResource(R.drawable.item01);
        ImageView img2 = new ImageView(this);
        img2.setImageResource(R.drawable.item02);
        ImageView img3 = new ImageView(this);
        img3.setImageResource(R.drawable.item03);
        ImageView img4 = new ImageView(this);
        img4.setImageResource(R.drawable.item04);
        ImageView img5 = new ImageView(this);
        img5.setImageResource(R.drawable.item05);
        ImageView img6 = new ImageView(this);
        img6.setImageResource(R.drawable.item06);
        ImageView img7 = new ImageView(this);
        img7.setImageResource(R.drawable.item07);
        ImageView img8 = new ImageView(this);
        img8.setImageResource(R.drawable.item08);

        views.add(img1);
        views.add(img2);
        views.add(img3);
        views.add(img4);
        views.add(img5);
        views.add(img6);
        views.add(img7);
        views.add(img8);
    }

    // 轮换适配器
    private class MyViewPagerAdapter extends PagerAdapter {

        /*
         * (non-Javadoc)
         * 
         * @see android.support.v4.view.PagerAdapter#getCount()
         */
        @Override
        public int getCount() {
            return Integer.MAX_VALUE;
            // TODO 完成PagerAdapter.getCount方法的构建或覆盖
        }

        /*
         * (non-Javadoc)
         * 
         * @see
         * android.support.v4.view.PagerAdapter#isViewFromObject(android.view
         * .View, java.lang.Object)
         */
        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
            // TODO 完成PagerAdapter.isViewFromObject方法的构建或覆盖
        }

        /*
         * (non-Javadoc)
         * 
         * @see
         * android.support.v4.view.PagerAdapter#instantiateItem(android.view
         * .View, int)
         */
        @Override
        public Object instantiateItem(View container, int position) {
            ((ViewPager) container).addView(
                    views.get(position % (views.size())), 0);
            return views.get(position % (views.size()));
            // TODO 完成MyViewPagerAdapter.instantiateItem方法的构建或覆盖
        }

        /*
         * (non-Javadoc)
         * 
         * @see
         * android.support.v4.view.PagerAdapter#destroyItem(android.view.View,
         * int, java.lang.Object)
         */
        @Override
        public void destroyItem(View container, int position, Object object) {
            ((ViewPager) container).removeView(views.get(position
                    % (views.size())));
            // TODO 完成MyViewPagerAdapter.destroyItem方法的构建或覆盖
        }
    }

    // 通用适配器
    private class MyViewPagerAdapter1 extends PagerAdapter {

        @Override
        public int getCount() {
            return views.size();
        }

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

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

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            container.addView(views.get(position), 0);
            return views.get(position);

        }

    }

}