public class AppMaskActivity extends RoboActivity implements View.OnClickListener {    public static final String HOME_MSG_CONTENT = "homemsg_content";    //首页消息中心弹框提示    @InjectView(R.id.rel_msg_popup_container)    private RelativeLayout mRelMsgPopupContainer;    @InjectView(R.id.vp_msg_img)    private ViewPager mVpMsgImg;    @InjectView(R.id.ll_dot_container)    private LinearLayout mLlDotContainer;    @InjectView(R.id.rel_vp_container)    private RelativeLayout mRelVpContainer;    @InjectView(R.id.iv_close)    private ImageView mIvClose;    private ArrayList<ImageView> pageViews;    private ImagePagerAdapter msgImgAdapter;    private Context context;    private List<MessageInfo> homeMessageList;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_app_mask);        context = this;        mRelMsgPopupContainer.setOnClickListener(this);        mIvClose.setOnClickListener(this);        //将view装入数组        loadVpView();        if (homeMessageList == null || homeMessageList.size() == 0){            finish();            return;        }        msgImgAdapter = new ImagePagerAdapter(this, pageViews, mVpMsgImg, mLlDotContainer, homeMessageList);        mVpMsgImg.setPageMargin(120);        mVpMsgImg.setPageTransformer(true, new ZoomOutPageTransformer());        mVpMsgImg.setAdapter(msgImgAdapter);        if (pageViews.size() > 1){            mVpMsgImg.setCurrentItem(pageViews.size()/2);        }    }    private void loadVpView() {        homeMessageList = HomeMsgManager.getInstance().getHomeMsgs();        pageViews = new ArrayList<ImageView>();        for (int i = 0; i < homeMessageList.size(); i++) {            ImageView iv = new ImageView(this);            Drawable drawable = HomeMsgManager.getInstance().getLocalDrawable(context, homeMessageList.get(i).getPicUrl());            if (drawable == null){                continue;            }            iv.setImageDrawable(drawable);            pageViews.add(iv);        }    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.rel_msg_popup_container:            case R.id.iv_close:                finish();                break;        }    }}

public class ZoomOutPageTransformer implements ViewPager.PageTransformer {    private static final float MIN_SCALE = 0.85f;    private static final float MIN_ALPHA = 0.5f;    @SuppressLint("NewApi")    public void transformPage(View view, float position) {        int pageWidth = view.getWidth();        int pageHeight = view.getHeight();        Log.e("TAG", view + " , " + position + "");        if (position < -1) { // [-Infinity,-1)            // This page is way off-screen to the left.            view.setAlpha(0);        } else if (position <= 1) //a页滑动至b页 ； a页从 0.0 -1 ；b页从1 ~ 0.0        { // [-1,1]            // Modify the default slide transition to shrink the page as well            float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));            float vertMargin = pageHeight * (1 - scaleFactor) / 2;            float horzMargin = pageWidth * (1 - scaleFactor) / 2;            if (position < 0) {                view.setTranslationX(horzMargin - vertMargin / 2);            } else {                view.setTranslationX(-horzMargin + vertMargin / 2);            }            // Scale the page down (between MIN_SCALE and 1)            view.setScaleX(scaleFactor);            view.setScaleY(scaleFactor);            // Fade the page relative to its size.            view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE)                    / (1 - MIN_SCALE) * (1 - MIN_ALPHA));        } else { // (1,+Infinity]            // This page is way off-screen to the right.            view.setAlpha(0);        }    }}

public class ImagePagerAdapter extends PagerAdapter implements ViewPager.OnPageChangeListener {    private static final String TAG = "state-viewpage";    private Context context;    private ViewPager viewPager;    ArrayList<ImageView> views;    private boolean mIsChanged = false;    private LinearLayout llDotContainer;    private int mCurrentPagePosition = FIRST_ITEM_INDEX;    private static int POINT_LENGTH = 0;    private static int FIRST_ITEM_INDEX = 1;    private static int IMAGE_POINT_LENGTH = 0;    private List<MessageInfo> mHomeMsgs;    private ImageView[] dotImages;    public ImagePagerAdapter(Context context, ArrayList<ImageView> viewpages, ViewPager viewPager,                             LinearLayout llDotContainer, List<MessageInfo> homeMessages) {        this.context = context;        this.viewPager = viewPager;        this.llDotContainer = llDotContainer;        mHomeMsgs = homeMessages;        this.viewPager.addOnPageChangeListener(this);        views = viewpages;        initCycleViews();        initImageData();        if (views.size() > 1) {            refresDotsIndex(POINT_LENGTH / 2);        }    }//这个方法就是将首尾两张图片分别加在两端    private void initCycleViews() {        //add two view        IMAGE_POINT_LENGTH = views.size();        if (views.size() >= 2) {            POINT_LENGTH = views.size();            ImageView prevFirst = new ImageView(context);            Drawable firstDrawable = views.get(0).getDrawable();            Drawable lastDrawable = views.get(views.size() - 1).getDrawable();            prevFirst.setImageDrawable(lastDrawable);            views.add(0, prevFirst);            ImageView prevFirst1 = new ImageView(context);            //prevFirst.setImageResource(R.drawable.ic_launcher);            prevFirst1.setImageDrawable(firstDrawable);            views.add(views.size(), prevFirst1);            //init small dots            initDots();        } else {            POINT_LENGTH = 0;            FIRST_ITEM_INDEX = 0;        }    }    //这个是图片的下标指示点，表示当前查看的图片是第几张，创建一个Linearlayout,然后动态添加imgview进去，selected状态来显示当前节点是否展示    private void initDots() {        if (IMAGE_POINT_LENGTH >= 2) {            dotImages = new ImageView[IMAGE_POINT_LENGTH];            for (int i = 0; i < IMAGE_POINT_LENGTH; i++) {                ImageView dot = new ImageView(context);                dot.setBackgroundResource(R.drawable.sel_dot_focused);                if (i == 0) dot.setSelected(true);                llDotContainer.addView(dot);                dotImages[i] = dot;            }        }    }//这个函数是给初始数据，打开就是一个demo了，从网络下直接加载图片显示，url在数组里给出    private void initImageData() {//        for (int i = 0; i < arrarys.length + 2; i++) {//            ImageView imageView = views.get(i);////            view 0 1 2 3 4 5////            data   4 1 2 3 4 0//            if (i == 0) {//                Picasso.with(context).load(arrarys[arrarys.length - 1]).into(imageView);//            } else if (i == arrarys.length + 1) {//                Picasso.with(context).load(arrarys[0]).into(imageView);//            } else {//                Picasso.with(context).load(arrarys[i-1]).into(imageView);//            }//        }    }    @Override    public Object instantiateItem(ViewGroup container, int position) {        ImageView imageView = (ImageView) views.get(position);        imageView.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //todo   页面点击事件在这里实现            }        });        container.addView(imageView);        return imageView;    }    @Override    public void destroyItem(ViewGroup container, int position, Object object) {        container.removeView((View) object);    }    @Override    public int getCount() {        return views.size();    }    @Override    public boolean isViewFromObject(View view, Object object) {        return view == object;    }    @Override    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {    }    @Override    public void onPageSelected(final int position) {        mIsChanged = true;        if (position > POINT_LENGTH) {            mCurrentPagePosition = FIRST_ITEM_INDEX;        } else if (position < FIRST_ITEM_INDEX) {            mCurrentPagePosition = POINT_LENGTH;        } else {            mCurrentPagePosition = position;        }        Log.i(TAG, "当前的位置是 " + mCurrentPagePosition);    }    @Override    public void onPageScrollStateChanged(int state) {        System.err.println("-------state------>" + state);        System.err.println("-------state-vitem----->" + viewPager.getCurrentItem());        switch (state) {            //在滚动完成之后            case ViewPager.SCROLL_STATE_IDLE:                if (mIsChanged) {                    mIsChanged = false;                    viewPager.setCurrentItem(mCurrentPagePosition, false);                    refresDotsIndex(mCurrentPagePosition - 1);                    Log.i(TAG, "set current " + mCurrentPagePosition);                }                break;        }    }    public void refresDotsIndex(int curr) {        for (int i = 0; i < IMAGE_POINT_LENGTH; i++) {            if (i == curr) {                dotImages[i].setSelected(true);            } else {                dotImages[i].setSelected(false);            }        }    }}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/rel_msg_popup_container"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@color/mask_bg">    <RelativeLayout        android:id="@+id/rel_vp_container"        android:layout_width="250dp"        android:layout_height="300dp"        android:background="@android:color/transparent"        android:layout_centerInParent="true">        <android.support.v4.view.ViewPager            android:id="@+id/vp_msg_img"            android:layout_width="500dp"            android:layout_height="600dp"            android:layout_centerInParent="true"            android:flipInterval="30"            android:persistentDrawingCache="animation" />        <LinearLayout            android:id="@+id/ll_dot_container"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignBottom="@id/vp_msg_img"            android:layout_centerInParent="true"            android:background="@android:color/transparent"            android:orientation="horizontal" />    </RelativeLayout>    <ImageView        android:id="@+id/iv_close"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/rel_vp_container"        android:layout_centerInParent="true"        android:layout_marginTop="10dp"        android:src="@drawable/close" /></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@drawable/oval" android:state_selected="true"/>    <item android:drawable="@drawable/oval_unsel" android:state_selected="false"/></selector>