Androidカスタムキャストマップ

ローテーションアドレス
概要

レイアウトを書きます.その中にはViewPager、TextView、LinearLayoutがあります.

ViewPager:ピクチャ

を担持するための

TextView:テキスト記述

を表示するために使用される

LinearLayout:インジケータ

を表示

はConstraintLayoutをカスタマイズする、このコントロールでページ切替ロジックなどを処理する.

ぶんせき

カスタム属性の取得およびいくつかの属性の設定

public BannerY(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initView(context);
    initXmlParams(context, attrs, defStyleAttr);
    fixParams();
    initListener();
    initLists();
    initImageLoader();
}
/**
 *    ImageLoader
 */
private void initImageLoader() {
    ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(mContext));
}
/**
 *       BannerY,  VP,TextView,LinearLayout  
 *
 * @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);
}
/**
 *        
 *
 * @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();
}
/**
 *                    
 */
private void fixParams() {
    //    
    LayoutParams mTvDescLayoutParams = (LayoutParams) mTvDesc.getLayoutParams();
    mTvDescLayoutParams.bottomMargin = (int) mTvBottomMargin;
    mTvDesc.setLayoutParams(mTvDescLayoutParams);
    mTvDesc.setTextColor(mDescColor);
    mTvDesc.getPaint().setTextSize(mDescSize);
    //   
    LayoutParams mLLPointLayoutParams = (LayoutParams) mLLPoint.getLayoutParams();
    mLLPointLayoutParams.bottomMargin = (int) mPointBottomMargin;
    mLLPoint.setLayoutParams(mLLPointLayoutParams);
}
/**
 *            Handler  
 */
@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);
            //   ViewPager          
            int currentItem = mVp.getCurrentItem();
            //         
            mVp.setCurrentItem(currentItem + 1);
            //             ,             .
            mHandler.sendEmptyMessageDelayed(1, mInterval);
        }
    };
}
/**
 *  ViewPager      
 */
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     Integer.MAX_VALUE   
            // position  ,   mImageViewList     .
            int realPosition = position % mImageViewList.size();
            if (mDescList.size() == mImageViewList.size()) {
                //                ,        TextView         .
                String desc = mDescList.get(realPosition);
                mTvDesc.setText(desc);
            } else {
                if (BuildConfig.DEBUG) {
                    Log.d(TAG, "              ");
                }
            }
            //                   
            mLLPoint.getChildAt(prePosition).setEnabled(false);
            //        LinearLayout             ,            ,         .
            mLLPoint.getChildAt(realPosition).setEnabled(true);
            prePosition = realPosition;
        }
        @Override
        public void onPageScrollStateChanged(int state) {
            if (state == ViewPager.SCROLL_STATE_DRAGGING) {//    
                //     ViewPager,          ,Handler       .
                isDragging = true;
                mHandler.removeCallbacksAndMessages(null);
            }
            if (state == ViewPager.SCROLL_STATE_IDLE && isDragging) {//    
                // ViewPager        ,    Handler    .
                mHandler.removeCallbacksAndMessages(null);
                mHandler.sendEmptyMessageDelayed(1, mInterval);
            }
        }
    });
}

ピクチャソースセット

を設定する.

/**
 *      
 * @param imagesRes
 * @param 
 */
public <T> void setImagesRes(ArrayList<T> imagesRes) {
    if (judgeLenght(imagesRes)) {
        mImageViewList.clear();
        //        
        initImageList(imagesRes);
        //   Adapter
        mBannerAdapter = new BannerAdapter(mImageViewList);
        mVp.setAdapter(mBannerAdapter);
        //   ViewPager         ,   ViewPager     Integer.MAX_VALUE( ViewPagerAdapter    ).
        int position = Integer.MAX_VALUE / 2 - Integer.MAX_VALUE / 2 % mImageViewList.size();
        //     ViewPager      
        mVp.setCurrentItem(position);
        //       
        mHandler.sendEmptyMessageDelayed(1, mInterval);
        if (mDescList.size() == mImageViewList.size()) {
            //         
            mTvDesc.setText(mDescList.get(prePosition));
        }
    }
}

/**
 *        
 */
private void initImageList(ArrayList imagesRes) {
    Class<?> imageResClass = imagesRes.get(0).getClass();
    for (int i = 0; i < imagesRes.size(); i++) {
        //   ImageView
        ImageView imageView = createImageView(imagesRes, i, imageResClass);
        //  ImageView      
        setImageViewListener(imageView);
        //  ImageView      
        mImageViewList.add(imageView);
        //     
        addPoint(i);
    }
}
/**
 *       ImageView  
 *
 * @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)) {
        //           url,    
        String url = (String) imagesRes.get(i);
        //   ImageLoader      ImageView 
        ImageLoader.getInstance().displayImage(url, imageView);
    } else if (imageResClass.equals(Integer.class)) {
        //               ID
        Integer resId = (Integer) imagesRes.get(i);
        imageView.setImageResource(resId);
    }
    return imageView;
}

/**
 *  ImageView             
 *
 * @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:
                    //     ImageView   ,    handler         
                    mHandler.removeCallbacksAndMessages(null);
                    break;
                case MotionEvent.ACTION_UP:
                    //      ,          .
                    mHandler.removeCallbacksAndMessages(null);
                    mHandler.sendEmptyMessageDelayed(1, mInterval);
                    break;
            }
            return false;
        }
    });
    imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mIClickBanner != null) {
                //    ImageView ,  getTage()              .
                //     ViewPagerAdapter  instantiateItem()    .
                int positon = (int) v.getTag();
                int i = positon % mImageViewList.size();
                mIClickBanner.click(i);
            } else {
                if (BuildConfig.DEBUG) {
                    Log.e(TAG, "          ");
                }
            }
        }
    });
}

BannerYのAdapter

public class BannerAdapter<T> extends PagerAdapter {
    private final static String TAG = BannerAdapter.class.getName();
    ArrayList<ImageView> mImageViewList;
    /**
     * @param mImageViewList ImageView     ,      IamgeView               .
     */
    public BannerAdapter(ArrayList<ImageView> mImageViewList) {
        this.mImageViewList = mImageViewList;
    }
    @Override
    public int getCount() {
        //   ViewPager     ,Integer.MAX_VALUE         ,             .
        return Integer.MAX_VALUE;
    }
    @SuppressLint("ClickableViewAccessibility")
    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, final int position) {
        // position      ,          mImageViewList        .
        final int realPosition = position % mImageViewList.size();
        ImageView imageView = mImageViewList.get(realPosition);
        //      ImageView  ,               .
        imageView.setTag(position);
        ViewParent viewParent = imageView.getParent();
        if (viewParent != null) {
            //      ViewPager      .
            ((ViewGroup) viewParent).removeView(imageView);
        }
        //       ViewPager 
        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) {
        
    }
}