public BannerY(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initView(context);
    initXmlParams(context, attrs, defStyleAttr);
    fixParams();
    initListener();
    initLists();
    initImageLoader();
}
/**
 * 初始化ImageLoader
 */
private void initImageLoader() {
    ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(mContext));
}
/**
 * 將布局填充進(jìn)BannerY,獲取VP,TextView,LinearLayout控件
 *
 * @param context
 */
private void initView(Context context) {
    mContext = context;
    LayoutInflater.from(context).inflate(R.layout.layout_banner, this);
    mVp = (ViewPager) findViewById(R.id.vp);
    mTvDesc = (TextView) findViewById(R.id.tv_desc);
    mLLPoint = (LinearLayout) findViewById(R.id.ll_point);
}
/**
 * 獲取自定義屬性
 *
 * @param context
 * @param attrs
 * @param defStyleAttr
 */
private void initXmlParams(Context context, AttributeSet attrs, int defStyleAttr) {
    TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.BannerY, defStyleAttr, 0);
    mPointSize = typedArray.getDimensionPixelSize(R.styleable.BannerY_point_size, 8);
    mPointBG = typedArray.getResourceId(R.styleable.BannerY_point_bg, R.drawable.point_selector);
    mInterval = typedArray.getInteger(R.styleable.BannerY_banner_interval, 2000);
    mTvBottomMargin = typedArray.getDimensionPixelSize(R.styleable.BannerY_desc_bottom_margin, 8);
    mPointBottomMargin = typedArray.getDimensionPixelSize(R.styleable.BannerY_point_bottom_margin, 8);
    mDescColor = typedArray.getColor(R.styleable.BannerY_desc_color, Color.BLACK);
    mDescSize = typedArray.getDimensionPixelSize(R.styleable.BannerY_desc_size, 14);
    mScaleType = typedArray.getInt(R.styleable.BannerY_banner_scaletype, -1);
    typedArray.recycle();
}
/**
 * 通過自定義屬性調(diào)整指示器與文字描述位置
 */
private void fixParams() {
    //描述控件
    LayoutParams mTvDescLayoutParams = (LayoutParams) mTvDesc.getLayoutParams();
    mTvDescLayoutParams.bottomMargin = (int) mTvBottomMargin;
    mTvDesc.setLayoutParams(mTvDescLayoutParams);
    mTvDesc.setTextColor(mDescColor);
    mTvDesc.getPaint().setTextSize(mDescSize);
    //指示器
    LayoutParams mLLPointLayoutParams = (LayoutParams) mLLPoint.getLayoutParams();
    mLLPointLayoutParams.bottomMargin = (int) mPointBottomMargin;
    mLLPoint.setLayoutParams(mLLPointLayoutParams);
}
/**
 * 創(chuàng)建數(shù)據(jù)源集合以及創(chuàng)建Handler對(duì)象
 */
@SuppressLint("HandlerLeak")
private void initLists() {
    mImageViewList = new ArrayList<>();
    mDescList = new ArrayList<>();
    mHandler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            // 獲取ViewPager當(dāng)前展示圖片的索引值
            int currentItem = mVp.getCurrentItem();
            // 切換到下一個(gè)圖片
            mVp.setCurrentItem(currentItem + 1);
            // 間隔一定時(shí)間發(fā)送一個(gè)消息,間隔時(shí)長(zhǎng)由自定義屬性值控制.
            mHandler.sendEmptyMessageDelayed(1, mInterval);
        }
    };
}
/**
 * 為ViewPager設(shè)置滑動(dòng)監(jiān)聽
 */
private void initListener() {
    mVp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        }
        @Override
        public void onPageSelected(int position) {
            // ViewPager總共設(shè)置有Integer.MAX_VALUE個(gè)視圖
            // position取模,轉(zhuǎn)換為mImageViewList對(duì)應(yīng)的索引.
            int realPosition = position % mImageViewList.size();
            if (mDescList.size() == mImageViewList.size()) {
                // 文字描述集合與圖片集合長(zhǎng)度相等,那么就為文字描述TextView展示對(duì)應(yīng)的文字內(nèi)容.
                String desc = mDescList.get(realPosition);
                mTvDesc.setText(desc);
            } else {
                if (BuildConfig.DEBUG) {
                    Log.d(TAG, "文字集合和圖片集合長(zhǎng)度不相等");
                }
            }
            // 上一個(gè)頁(yè)面對(duì)應(yīng)的指示器設(shè)置為沒有選中
            mLLPoint.getChildAt(prePosition).setEnabled(false);
            // 從裝有指示器的LinearLayout中獲得當(dāng)前視圖對(duì)應(yīng)的指示器,然后設(shè)置指示器當(dāng)前是選中,從而改變指示器顏色.
            mLLPoint.getChildAt(realPosition).setEnabled(true);
            prePosition = realPosition;
        }
        @Override
        public void onPageScrollStateChanged(int state) {
            if (state == ViewPager.SCROLL_STATE_DRAGGING) {//正在滑動(dòng)
                // 手動(dòng)觸碰ViewPager,使之正在處于滑動(dòng)狀態(tài),Handler就停止發(fā)送消息.
                isDragging = true;
                mHandler.removeCallbacksAndMessages(null);
            }
            if (state == ViewPager.SCROLL_STATE_IDLE && isDragging) {//空閑狀態(tài)
                // ViewPager手動(dòng)滑動(dòng)停止之后,重新開啟Handler發(fā)送消息.
                mHandler.removeCallbacksAndMessages(null);
                mHandler.sendEmptyMessageDelayed(1, mInterval);
            }
        }
    });
}

/**
 * 設(shè)置圖片源
 * @param imagesRes
 * @param <T>
 */
public <T> void setImagesRes(ArrayList<T> imagesRes) {
    if (judgeLenght(imagesRes)) {
        mImageViewList.clear();
        // 初始化圖片列表
        initImageList(imagesRes);
        // 創(chuàng)建Adapter
        mBannerAdapter = new BannerAdapter(mImageViewList);
        mVp.setAdapter(mBannerAdapter);
        // 設(shè)置ViewPager當(dāng)前視圖為中間位置, 因?yàn)閂iewPager視圖個(gè)數(shù)為Integer.MAX_VALUE(在ViewPagerAdapter中設(shè)置的).
        int position = Integer.MAX_VALUE / 2 - Integer.MAX_VALUE / 2 % mImageViewList.size();
        // 設(shè)置當(dāng)前ViewPager展示哪個(gè)視圖
        mVp.setCurrentItem(position);
        // 開啟消息循環(huán)
        mHandler.sendEmptyMessageDelayed(1, mInterval);
        if (mDescList.size() == mImageViewList.size()) {
            // 設(shè)置文字描述展示
            mTvDesc.setText(mDescList.get(prePosition));
        }
    }
}

/**
 * 初始化圖片列表
 */
private void initImageList(ArrayList imagesRes) {
    Class<?> imageResClass = imagesRes.get(0).getClass();
    for (int i = 0; i < imagesRes.size(); i++) {
        // 創(chuàng)建ImageView
        ImageView imageView = createImageView(imagesRes, i, imageResClass);
        // 為ImageView設(shè)置點(diǎn)擊事件
        setImageViewListener(imageView);
        // 將ImageView添加進(jìn)集合中
        mImageViewList.add(imageView);
        //添加指示器
        addPoint(i);
    }
}
/**
 * 根據(jù)參數(shù)創(chuàng)建ImageView對(duì)象
 *
 * @param imagesRes
 * @param i
 * @param imageResClass
 * @return
 */
private ImageView createImageView(ArrayList imagesRes, int i, Class<?> imageResClass) {
    ImageView imageView = new ImageView(mContext);
    ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
    imageView.setLayoutParams(layoutParams);
    ImageView.ScaleType scaleType = sScaleTypeArray[mScaleType];
    imageView.setScaleType(scaleType);
    if (imageResClass.equals(String.class)) {
        // 假如圖片數(shù)據(jù)源集合是url,網(wǎng)址圖片
        String url = (String) imagesRes.get(i);
        // 使用ImageLoader將圖片展示到ImageView中
        ImageLoader.getInstance().displayImage(url, imageView);
    } else if (imageResClass.equals(Integer.class)) {
        // 假如圖片數(shù)據(jù)源集合是圖片資源ID
        Integer resId = (Integer) imagesRes.get(i);
        imageView.setImageResource(resId);
    }
    return imageView;
}

/**
 * 為ImageView對(duì)象設(shè)置點(diǎn)擊事件和觸摸事件
 *
 * @param imageView
 */
@SuppressLint("ClickableViewAccessibility")
private void setImageViewListener(ImageView imageView) {
    imageView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    // 當(dāng)手指在ImageView下按下,那么停止handler發(fā)送切換圖片的消息
                    mHandler.removeCallbacksAndMessages(null);
                    break;
                case MotionEvent.ACTION_UP:
                    // 當(dāng)手指抬起,正常發(fā)送切換圖片消息.
                    mHandler.removeCallbacksAndMessages(null);
                    mHandler.sendEmptyMessageDelayed(1, mInterval);
                    break;
            }
            return false;
        }
    });
    imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mIClickBanner != null) {
                // 當(dāng)點(diǎn)擊ImageView時(shí),通過getTage()獲取圖片當(dāng)前對(duì)應(yīng)的視圖索引值.
                // 該值是在ViewPagerAdapter中的instantiateItem()中設(shè)置的.
                int positon = (int) v.getTag();
                int i = positon % mImageViewList.size();
                mIClickBanner.click(i);
            } else {
                if (BuildConfig.DEBUG) {
                    Log.e(TAG, "圖片回調(diào)方法為不存在");
                }
            }
        }
    });
}

public class BannerAdapter<T> extends PagerAdapter {
    private final static String TAG = BannerAdapter.class.getName();
    ArrayList<ImageView> mImageViewList;
    /**
     * @param mImageViewList ImageView 控件列表,該列表中中的IamgeView都設(shè)置了圖片資源還有點(diǎn)擊事件等.
     */
    public BannerAdapter(ArrayList<ImageView> mImageViewList) {
        this.mImageViewList = mImageViewList;
    }
    @Override
    public int getCount() {
        // 設(shè)置ViewPager的視圖個(gè)數(shù),Integer.MAX_VALUE是一個(gè)非常大的數(shù)字, 不管輪詢多久都很難到盡頭.
        return Integer.MAX_VALUE;
    }
    @SuppressLint("ClickableViewAccessibility")
    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, final int position) {
        // position這個(gè)數(shù)字很大, 取模之后就能夠?qū)?yīng)mImageViewList集合中的索引值了.
        final int realPosition = position % mImageViewList.size();
        ImageView imageView = mImageViewList.get(realPosition);
        // 將索引值與ImageView綁定,當(dāng)被點(diǎn)擊的時(shí)候可以取出該索引值.
        imageView.setTag(position);
        ViewParent viewParent = imageView.getParent();
        if (viewParent != null) {
            // 這里是防止ViewPager重復(fù)添加圖片.
            ((ViewGroup) viewParent).removeView(imageView);
        }
        // 將圖片添加進(jìn)ViewPager中
        container.addView(imageView);
        return imageView;
    }

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

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        
    }
}