PDFPagerAdapter.java 文件源码

@Override
@SuppressWarnings("NewApi")
public Object instantiateItem(ViewGroup container, int position) {
    View v = inflater.inflate(R.layout.view_pdf_page, container, false);
    ImageView iv = (ImageView) v.findViewById(R.id.imageView);

    if (renderer == null || getCount() < position) {
        return v;
    }

    PdfRenderer.Page page = getPDFPage(renderer, position);

    Bitmap bitmap = bitmapContainer.get(position);
    page.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
    page.close();

    PhotoViewAttacher attacher = new PhotoViewAttacher(iv);
    attacher.setScale(scale.getScale(), scale.getCenterX(), scale.getCenterY(), true);
    attacher.setOnMatrixChangeListener(this);

    attachers.put(position, new WeakReference<PhotoViewAttacher>(attacher));

    iv.setImageBitmap(bitmap);
    attacher.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() {
        @Override
        public void onPhotoTap(View view, float x, float y) {
            if (pageClickListener != null) {
                pageClickListener.onPageTap(view, x, y);
            }
        }
    });
    attacher.update();
    container.addView(v, 0);

    return v;
}