Android PDFViewer
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
Download
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
PdfViewInterfaceand setting it into thePdfViewer -
You can customize the adapter overriding the
PdfPageViewAdapterandPdfPageViewHolderand setting it as you adapter in thePdfViewerRecyclerViewor any recycler view that implementsPdfViewInterface
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)