轮播图

来源：互联网发布：银联卡网络支付接口编辑：程序博客网时间：2024/05/22 15:17

首先初始化几张图片

private int[] imgs = { R.drawable.page1, R.drawable.page2, R.drawable.page3 };    /**     * 初始化首页轮播图，本地图片     */    private void initImg() {        imgList = new ArrayList<ImageView>();        for (int i = 0; i < imgs.length; i++) {            ImageView view = new ImageView(mContext);            view.setBackgroundResource(imgs[i]);            imgList.add(view);        }    }

递归方法

    private void initHandler() {        if (mHandler == null) {            mHandler = new InternalHandler();        } else {            mHandler.removeCallbacksAndMessages(null);        }        mHandler.postDelayed(new InternalRunnable(), 4000);    }

viewpager设置

        mViewPager.setAdapter(new ViewPagerAdapter(imgList, mHandler));        mViewPager.setOnPageChangeListener(new HomeOnPageChangeListener());

viewpager监听器

public class ViewPagerAdapter extends PagerAdapter {    private List<ImageView> mImageViewList;    private Handler mHandler;    public ViewPagerAdapter(List<ImageView> imageViewList, Handler mHandler) {        super();        this.mImageViewList = imageViewList;        this.mHandler = mHandler;    }    @Override    public int getCount() {        return mImageViewList.size();    }    @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);    }    @Override    public Object instantiateItem(ViewGroup container, int position) {        ImageView iv = mImageViewList.get(position);        iv.setScaleType(ScaleType.FIT_XY);        iv.setOnTouchListener(new MyOnTouchListener());        container.addView(iv);        return iv;    }    class MyOnTouchListener implements OnTouchListener {        @Override        public boolean onTouch(View v, MotionEvent event) {            switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                mHandler.removeCallbacksAndMessages(null); // 移除消息队列中所有的任务和消息.                break;            case MotionEvent.ACTION_CANCEL: // 事件丢失                mHandler.postDelayed(new InternalRunnable(), 4000);                break;            case MotionEvent.ACTION_UP:                mHandler.postDelayed(new InternalRunnable(), 4000);                break;            default:                break;            }            return true;        }    }    class InternalRunnable implements Runnable {        @Override        public void run() {            mHandler.sendEmptyMessage(0);        }    }}

viewpager滚动时监听动作

class HomeOnPageChangeListener implements OnPageChangeListener {        @Override        public void onPageScrollStateChanged(int arg0) {        }        @Override        public void onPageScrolled(int arg0, float arg1, int arg2) {        }        @Override        public void onPageSelected(int arg0) {            for (int i = 0; i < imgs.length; i++) {                llPointGroup.getChildAt(i).setEnabled(false);            }            llPointGroup.getChildAt(arg0).setEnabled(true);        }    }

递归方法

/**     * 控制轮播图自动滚动     *      */    class InternalHandler extends Handler {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            int currentItem = (mViewPager.getCurrentItem() + 1)                    % imgList.size();            mViewPager.setCurrentItem(currentItem);            mHandler.postDelayed(new InternalRunnable(), 4000);        }    }    class InternalRunnable implements Runnable {        @Override        public void run() {            mHandler.sendEmptyMessage(0);        }    }

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