Android如何实现图片轮播

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实现图片导航界面的轮播,也可以用在app的引导图片实现

xml

  <android.support.v4.view.ViewPager            android:id="@+id/viewPager"            android:layout_width="fill_parent"            android:layout_height="160dp" />

java

activity

viewPager = (ViewPager) mView.findViewById(R.id.viewPager);        ImageView view1 = new ImageView(ctx);        view1.setBackgroundResource(R.drawable.test1);        mViewList.add(view1);        ImageView view2 = new ImageView(ctx);        view2.setBackgroundResource(R.drawable.test2);        mViewList.add(view2);        ImageView view3 = new ImageView(ctx);        view3.setBackgroundResource(R.drawable.test3);        mViewList.add(view3);        //设置适配器        adapter = new MhealthAdater(mViewList);        viewPager.setAdapter(adapter);        //默认显示的图片        currentItem = (int) (Integer.MAX_VALUE * 0.5);        viewPager.setCurrentItem((int) (Integer.MAX_VALUE * 0.5));        //定时更新UI        mhandler.sendEmptyMessageDelayed(0, 2000);        viewPager.setOnPageChangeListener(new OnPageChangeListener() {            @Override            public void onPageSelected(int arg0) {                changeIcon(arg0);                currentItem = arg0;            }            @Override            public void onPageScrolled(int arg0, float arg1, int arg2) {            }            //处于滑动状态时不轮播图片            @Override            public void onPageScrollStateChanged(int arg0) {                if (arg0 == 0) {                    isScroll = false;                } else {                    isScroll = true;                }            }        });    /*     * 轮播图片     */    private Handler mhandler = new Handler() {        @Override        public void handleMessage(Message msg) {            //递归调用自身            mhandler.sendEmptyMessageDelayed(0, 2000);            if (isScroll) {            } else {                currentItem = currentItem + 1;                viewPager.setCurrentItem(currentItem);                changeIcon(currentItem);            }        }    };

适配器

import java.util.List;import android.support.v4.view.PagerAdapter;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.view.ViewParent;import android.widget.ImageView;public class MhealthAdater extends PagerAdapter {    private List<ImageView> mViewList;     public MhealthAdater(List<ImageView> mViewList){        this.mViewList=mViewList;    }    @Override    public void destroyItem(ViewGroup container, int position, Object object) {        // TODO Auto-generated method stub//      container.removeView(mViewList.get(position));    }//初始化    @Override    public Object instantiateItem(ViewGroup container, int position) {        position %= mViewList.size();          ImageView view = mViewList.get(position);          //如果View已经在之前添加到了一个父组件，则必须先remove，否则会抛出IllegalStateException。          ViewParent vp =view.getParent();          if (vp!=null){              ViewGroup parent = (ViewGroup)vp;              parent.removeView(view);          }          container.addView(view);            //add listeners here if necessary          return mViewList.get(position);        }    @Override    public int getCount() {        // 设置view数量为最大值,实现左右无限轮播        return Integer.MAX_VALUE;    }    @Override    public boolean isViewFromObject(View arg0, Object arg1) {    //推荐使用,View是否来自对象        return arg0==arg1;    }    }

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