Android自定义AutoScrollViewPager:自动循环滑动页面

---------------------布局页面----------------------------------------------

<RelativeLayout

      </RelativeLayout>

-----------------------------有做修改的AutoScrollViewPager------------------------------------

public class AutoScrollViewPager<T extends PagerImageData> extends ViewPager {
/**定义页面点击事件*/
public interface OnPageItemClickListener<T extends PagerImageData> {
void onPageItemClickListener(T pd);
}
/**滑动时间间距*/
private int mScrollTime = 0;
/**之前位置*/
private int oldIndex = 0;
/**当前页面位置*/
private int curIndex = 0;
/**图片数据集合*/
private List<T> mPagerData = new ArrayList<T>();
/**适配器*/
private PagerAdapter pagerAdapter;
/**图片下面指示小圆点所在布局*/
private LinearLayout indicatorView;
/**小圆点状态图片resId*/
private int focusedDrawable, normalDrawable;
private LayoutInflater inflater;
private OnPageItemClickListener<T> pageItemClickListener;
/**是否是假的循环*/
private boolean isFakeCycle = false;
/**是否开始滚动*/
private boolean isStartScroll;
/**页面改变监听*/
private PageChangedCallBack mCallBack;
public interface PageChangedCallBack{
void onPageChange(int position);
}


public AutoScrollViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
inflater = LayoutInflater.from(context);
focusedDrawable = R.drawable.common_dot_selected;
normalDrawable = R.drawable.common_dot_normal;


setInternalPageChangeListener(new OnPageChangeListener() {
public void onPageSelected(int i) {
if(mCallBack!=null)
mCallBack.onPageChange(i);
if (mPagerData.isEmpty() || indicatorView == null || indicatorView.getChildCount() == 0)
return;
curIndex = i % mPagerData.size();
/**取消圆点选中*/
indicatorView.getChildAt(oldIndex).setBackgroundResource(normalDrawable);
/**圆点选中*/
indicatorView.getChildAt(curIndex).setBackgroundResource(focusedDrawable);
oldIndex = curIndex;
}


public void onPageScrolled(int arg0, float arg1, int arg2) {
}


public void onPageScrollStateChanged(int arg0) {
}
});


/**设置滑动动画时间 ,如果用默认动画时间可不用 ,反射技术实现*/
new FixedSpeedScroller(getContext()).setDuration(this, 700);


pagerAdapter = new MyPagerAdapter();
setAdapter(pagerAdapter);
/**设置预加载数据量，自己设定*/
setOffscreenPageLimit(2);
/**用requestDisallowInterceptTouchEvent()方法防止viewpager和子view冲突*/
requestDisallowInterceptTouchEvent(true);

options = new DisplayImageOptions.Builder().showImageOnLoading(R.drawable.index_advert_default) /**加载过程中默认显示图片*/
.showImageForEmptyUri(R.drawable.index_advert_default)  /**图片url为空果默认显示图片*/
.showImageOnFail(R.drawable.index_advert_default)  /**加载错误时默认显示图片*/
.resetViewBeforeLoading(false).build();
}

public void setPageChangeCallback(PageChangedCallBack clallBack){
mCallBack=clallBack;
}

@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if(isStartScroll){
start(mScrollTime);
}
}

@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
if(isStartScroll)
handler.removeCallbacksAndMessages(null);
}


/** 构建内部索引父view */
private void initInnerIndicator() {
indicatorView = new IndicatorView(getContext());
indicatorView.setGravity(Gravity.CENTER);
indicatorView.setBackgroundColor(0x0fFF00FF);
indicatorView.setOrientation(LinearLayout.HORIZONTAL);
LayoutParams params = new LayoutParams();
params.width = ViewGroup.LayoutParams.MATCH_PARENT;
params.height = 40;
params.gravity = Gravity.BOTTOM;
addView(indicatorView, params);
}


public void setDatas(List<T> imgUrls, LinearLayout outIndicator, boolean needInnerIndicator, boolean isFakeCycle) {
this.isFakeCycle = isFakeCycle;
setDatas(imgUrls, outIndicator, needInnerIndicator);
}

/**重复调用可能会anr*/
public void setDatas(List<T> imgUrls, LinearLayout outIndicator, boolean needInnerIndicator) {
if (outIndicator != null) {
indicatorView = outIndicator;
}
else if (needInnerIndicator) {
initInnerIndicator();
}
mPagerData.clear();
mPagerData.addAll(imgUrls);
pagerAdapter.notifyDataSetChanged();
}

/**重新加载图片数据，刷新vp内容*/
public void refreshDatas(List<T> imgUrls, LinearLayout outIndicator, boolean needInnerIndicator,boolean isFakeCycle) {
this.isFakeCycle = isFakeCycle;
if (outIndicator != null) {
indicatorView = outIndicator;
}
else if (needInnerIndicator) {
initInnerIndicator();
}
mPagerData.clear();
mPagerData.addAll(imgUrls);
pagerAdapter = new MyPagerAdapter();
setAdapter(pagerAdapter);
pagerAdapter.notifyDataSetChanged();
}


@Override
void dataSetChanged() {
super.dataSetChanged();
setUpIndicator();
}


/**设置圆点*/
private void setUpIndicator() {
if (indicatorView != null) {
indicatorView.removeAllViews();
if (mPagerData.isEmpty()) {
indicatorView.setVisibility(View.GONE);
return;
}
else {
indicatorView.setVisibility(View.VISIBLE);
}
for (int i = 0; i < mPagerData.size(); i++) {
View v = inflater.inflate(R.layout.auto_scrollpage_dot, indicatorView, false);
v.setBackgroundResource(normalDrawable);
indicatorView.addView(v);
}
indicatorView.getChildAt(0).setBackgroundResource(focusedDrawable);
}
curIndex = oldIndex = 0;
if (mPagerData.size() > 1 && isFakeCycle) {
setCurrentItem(15 - 15 % mPagerData.size());
}
else {
setCurrentItem(0);
}
}


/** 获取真实的当前位置 */
public int getCurrentPosition() {
return curIndex;
}


/** 获取真实的当前位置的数据 */
public T getCurrentData() throws IndexOutOfBoundsException {
return mPagerData.get(curIndex);
}


@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_UP || ev.getAction() == MotionEvent.ACTION_CANCEL) {
start();
}
else {
handler.removeCallbacksAndMessages(null);
}
return super.onInterceptTouchEvent(ev);
}


@Override
public boolean onTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_UP || ev.getAction() == MotionEvent.ACTION_CANCEL) {
start();
}
else {
handler.removeCallbacksAndMessages(null);
}
return super.onTouchEvent(ev);
}


/** 开始广告滚动 */
private void start() {
start(mScrollTime);
}


public void start(int scrollTime) {
mScrollTime = scrollTime;
isStartScroll = false;
if (mScrollTime > 0 && !mPagerData.isEmpty()) {
isStartScroll = true;
handler.sendMessageDelayed(handler.obtainMessage(), mScrollTime);
}
}


private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
handler.removeCallbacksAndMessages(null);
if(isFakeCycle){
setCurrentItem(getCurrentItem() + 1);
}else{
if(getCurrentItem() == mPagerData.size()-1){
setCurrentItem(0, true);
}else{
setCurrentItem(getCurrentItem() + 1);
}
}
handler.sendMessageDelayed(handler.obtainMessage(), mScrollTime);
};
};
/**加载网络图片，用到了Universal-Image-Loader开源框架*/
private DisplayImageOptions options;

public void setImageOptions(DisplayImageOptions options){
this.options=options;
}


/**ViewPager适配器*/
private class MyPagerAdapter extends PagerAdapter {


@Override
public int getCount() {
if (mPagerData.size() == 1) {
return 1;
}
else if (mPagerData.size() > 1) {
return isFakeCycle ? Integer.MAX_VALUE : mPagerData.size(); 
}
return 0;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
final int realP = position % mPagerData.size();
final ImageView netImgView = (ImageView) inflater.inflate(R.layout.auto_scrollpage_img, container, false);
ImageLoader.getInstance().displayImage(mPagerData.get(realP).getImageUrl(), netImgView, options);
netImgView.setOnClickListener(new View.OnClickListener() {


@Override
public void onClick(View v) {
if (pageItemClickListener != null) {
pageItemClickListener.onPageItemClickListener(mPagerData.get(realP));
}
}
});


container.addView(netImgView);
return netImgView;
}


@Override
public void destroyItem(ViewGroup container, int position, Object object) {
if (object instanceof View) {
container.removeView((View) object);
}
}


@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
}


/** 设置显示条目的点击事件 */
public void setOnPageItemClickListener(OnPageItemClickListener<T> pageItemClickListener) {
this.pageItemClickListener = pageItemClickListener;
}
}

-----------------内部数据模型，根据需要添加-----------------------------------------

public interface PagerImageData{
public String getImageUrl();/**用于显示网络图片*/
public void setImageUrl(String imgUrl);
}

--------------------在Activity中使用AutoScrollViewPager--------------------------------------------------------

/**图片展示，ImageBean是项目中用到的请求服务器json数据的实体bean(要继承PagerImageData) */
private AutoScrollViewPager<ImageBean> advertiseVp;

advertiseVp = (AutoScrollViewPager<ImageBean>) findViewById(R.id.luck_detail_Vp);

advertiseVp.setOnPageItemClickListener(new OnPageItemClickListener<ImageBean>() {
@Override
public void onPageItemClickListener(ImageBean pd) {
//页面点击事件，做想做的效果（查看大图，跳转到其它地方等）
}
});

/**添加数据imageArray是从服务器取得的图片url集合，也可以自己准备好List<ImageBean> imageArray=new ArrayList<imageArray>(),往里面加想要的数据*/

      advertiseVp.refreshDatas(imageArray, (LinearLayout) findViewById(R.id.luck_detail_adv_dotLl), false, true);
advertiseVp.start(3000);

Activity中的代码没有写全，有时间把项目中用到的整理成个demo上传上去，注意文章中两处红色的地方，我在代码中简写了。