/android-pdfviewer

A Android PDF Viewer that render pdf using PdfRenderer and displays it in a RecyclerView.

Primary LanguageKotlin

Android PDFViewer

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A Android PDF Viewer that render pdf using PdfRenderer and displays it in a RecyclerView. The main goal was to render the pages only when necessary using AsyncTask to gain performance.

  • Requires API Level 21

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implementation 'com.danjdt:pdfviewer:0.1.0'

How to use

    PdfViewer.Builder(rootView)
      .build()
      .load(file)

All available options:

    PdfViewer.Builder(rootView)
      .view(view)
      .quality(PdfPageQuality)
      .setZoomEnabled(true)
      .setMaxZoom(3f) //zoom multiplier
      .setOnPageChangedListener(onPageChangedListener)
      .setOnErrorListener(onErrorListener)
      .build()
      .load(file)

File load options

    pdfViewer.load(file : File)
    pdfViewer.load(url : String)
    pdfViewer.load(@RawRes resId : Int)
    pdfViewer.load(inputStream : InputStream)
Scroll Zoom

Customize

  • You can customize your view creating any view that implements PdfViewInterface and setting it into the PdfViewer

  • You can customize the adapter overriding the PdfPageViewAdapter and PdfPageViewHolder and setting it as you adapter in the PdfViewerRecyclerView or any recycler view that implements PdfViewInterface

Example

    class MyCustomPdfPageAdapter(private val context: Context) :
        PdfPageAdapter<DefaultPdfPageViewHolder>() {

        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DefaultPdfPageViewHolder {
            val inflater = LayoutInflater.from(context)
            val view = inflater.inflate(R.layout.pdf_page, parent, false)
            return DefaultPdfPageViewHolder(view, pdfRenderer, pageSize)
        }

        override fun onBindViewHolder(holder: DefaultPdfPageViewHolder, position: Int) {
            holder.bind(position)
        }
    }

and

    class MyCustomPdfPageViewHolder(view: View, pdfRenderer: PdfRendererInterface, pageSize: Size?) :
    PdfPageViewHolder(view, pdfRenderer, pageSize) {

        private val image: ImageView = itemView.findViewById(R.id.image)

        override fun displayPage(bitmap: Bitmap, position: Int) {
            image.setImageBitmap(bitmap)
        }

        override fun resizePage() {
            pageSize?.let {pageSize ->
                image.layoutParams.width = pageSize.width
                image.layoutParams.height = pageSize.height
            }
        }

        override fun getPage(position: Int) {
            pdfRenderer.get(this, pagePosition)
        }

        override fun displayPlaceHolder() {
            {...}
        }
    }

then

    val pdfRecyclerView = PdfViewerRecyclerView(context)
    pdfRecylerView.adapter = MyCustomPdfPageAdapter(context)
    
    PdfViewer.Builder(rootView).view(pdfRecyclerView).build().load(file)