PagerAdapter 普通写法

1,viewPagre的普通写法

public ImagePagerAdapter(Context context, List<Photo> imgList) {
    this.mContext = context;
}

private void createImageViews() {
    for (int i = 0; i < 4; i++) {
        PhotoView imageView = new PhotoView(mContext);
        imageView.enable();
        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
        imageView.setMaxScale(2);
        imageView.setImageResource(R.color.atlas_bgc);
        viewList.add(imageView);
    }
}

@Override
public int getCount() {
    return mImgList == null ? 0 : mImgList.size();
}

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

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    if(object instanceof PhotoView){
        PhotoView view = (PhotoView)object;
        view.enable();
        view.setScaleType(ImageView.ScaleType.FIT_CENTER);
        view.setMaxScale(2);
        view.setImageResource(R.color.atlas_bgc);
        viewList.add(view);
        container.removeView(view);
    }
}

@Override
public Object instantiateItem(ViewGroup container, final int position) {
    final PhotoView currentView = viewList.remove(0);
    final Photo image = mImgList.get(position);
    container.addView(currentView);
    if(!TextUtils.isEmpty(image.getPath())){
        Glide.with(mContext).load(new File(image.getPath()))
                .diskCacheStrategy(DiskCacheStrategy.NONE).into(currentView);
    }

    currentView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mListener != null) {
                mListener.onItemClick(position, image);
            }
        }
    });
    return currentView;
}