android 轮播图无限循环，自动播放

在Fragment中添加Handler：

private static class BannerHandler extends Handler {@Overridepublic void handleMessage(Message msg) {if (msg.what == MSG_SWITCH_PIC) {if (vpBanner != null) {if (switchPictureAdapter != null) {vpBanner.setCurrentItem(vpBanner.getCurrentItem() + 1);this.sendEmptyMessageDelayed(MSG_SWITCH_PIC,BANNER_TIME_PEROID);}}}}}

初始化：

bannerHandler = new BannerHandler();bannerHandler.sendEmptyMessageDelayed(MSG_SWITCH_PIC,BANNER_TIME_PEROID);mImgUrls.clear();mImgUrls.add("https://www.baidu.com/img/bd_logo1.png");mImgUrls.add("https://www.baidu.com/img/bd_logo1.png");mImgUrls.add("https://www.baidu.com/img/bd_logo1.png");switchPictureAdapter = new SwitchPictureAdapter(mActivity, vpBanner,mImgUrls, view);vpBanner.setAdapter(switchPictureAdapter);if (mImgUrls.size() > 1) {vpBanner.setCurrentItem(1);}

轮播图的适配器：

public class SwitchPictureAdapter extends PagerAdapter {private Context mContext;private List mImageViews;private List mImgUrls;private LinearLayout mPoints;private ViewPager mViewPage;public SwitchPictureAdapter(Context mContext, ViewPager page,List mImgUrls, View view) {super();this.mContext = mContext;this.mImgUrls = mImgUrls;this.mImageViews = new ArrayList();this.mViewPage = page;this.mPoints = (LinearLayout) view.findViewById(R.id.ll_point);mPoints.removeAllViews();initData();initViews();this.mViewPage.setOnPageChangeListener(new PagerListener());}private void initData() {// 实现无限循环，另外添加两张图片mImgUrls.add(0, mImgUrls.get(mImgUrls.size() - 1)); // 第一个位置添加最后一张mImgUrls.add(mImgUrls.get(1));// 最后一个位置添加第0张// 添加点for (int i = 0; i < mImgUrls.size() - 2; i++) {ImageView point = new ImageView(mContext);int dp = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8, mContext.getResources().getDisplayMetrics());LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(dp, dp);int margin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 4, mContext.getResources().getDisplayMetrics());params.setMargins(margin, 0, margin, 0);point.setLayoutParams(params);if (i == 0) {point.setBackgroundResource(R.drawable.point_red);} else {point.setBackgroundResource(R.drawable.point_normal);}mPoints.addView(point);}}private void initViews() {if (mImgUrls != null) {for (int i = 0; i < mImgUrls.size(); i++) {ImageView view = new ImageView(mContext);view.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));ImageLoadUtil.loadImage(mImgUrls.get(i), view);mImageViews.add(view);if (mImgUrls.size() <= 3) {// 说明只有一张图片break;}}}}@Overridepublic Object instantiateItem(ViewGroup container, int position) {ImageView view = mImageViews.get(position);ViewGroup parent = (ViewGroup) view.getParent();if (parent != null) {parent.removeAllViews();}container.addView(view);return view;}@Overridepublic int getCount() {if (mImgUrls == null) {return 0;}if (mImgUrls.size() <= 3) {return 1;}return mImgUrls.size();}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {return arg0 == arg1;}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {container.removeView((ImageView) object);}private class PagerListener implements OnPageChangeListener {@Overridepublic void onPageScrollStateChanged(int arg0) {}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {}@Overridepublic void onPageSelected(int pos) {if (mImageViews.size() > 1) { // 图片多余一张才轮播if (pos < 1) {pos = mImageViews.size() - 2;mViewPage.setCurrentItem(pos, false);} else if (pos > mImageViews.size() - 2) {mViewPage.setCurrentItem(1, false);pos = 1;}for (int i = 0; i < mPoints.getChildCount(); i++) {if (pos == i + 1) {mPoints.getChildAt(i).setBackgroundResource(R.drawable.point_red);} else {mPoints.getChildAt(i).setBackgroundResource(R.drawable.point_normal);}}}}}}

手指移动不播放

/** * 手滑动banner时不自动播放 */@Overridepublic boolean onTouch(View v, MotionEvent event) {if (v.getId() == R.id.vp_banner) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:bannerHandler.removeMessages(MSG_SWITCH_PIC);break;case MotionEvent.ACTION_MOVE:bannerHandler.removeMessages(MSG_SWITCH_PIC);break;case MotionEvent.ACTION_UP:bannerHandler.sendEmptyMessageDelayed(MSG_SWITCH_PIC,BANNER_TIME_PEROID);break;case MotionEvent.ACTION_CANCEL:bannerHandler.sendEmptyMessageDelayed(MSG_SWITCH_PIC,BANNER_TIME_PEROID);break;default:break;}}return false;}

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