Display PDF in ImageView (Zoomable)

Just a quick setup to render a pdf File.

XML Fragment of Image view (somewhere in your layouts xml where you need it)

    <RelativeLayout
        android:id="@+id/relativeLayout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@color/colorSecondary"
        app:layout_constraintBottom_toTopOf="@+id/linearLayout"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:contentDescription="@string/pdf_view"
            tools:srcCompat="@tools:sample/avatars" />

    </RelativeLayout>

Dependencies in build.gradle (Module File) [Inside dependencies { } ]

    /* PDF LIBRARY AND PHOTOVIEWER ZOOM UPDATE APACHE 2 LICENSE */
      implementation 'com.github.barteksc:android-pdf-viewer:2.8.2' /* To Render PDF */
      implementation 'com.commit451:PhotoView:1.2.4' /* To zoom and scroll image view */

The Java Code

   PdfiumCore pdfiumCore = new PdfiumCore(getApplicationContext());
   Uri currenturi  =   Uri.fromFile(FILE OBJECT WITH PDF FILE);
    ParcelFileDescriptor fd = getApplicationContext().getContentResolver().openFileDescriptor(currenturi, "r");
    PdfDocument pdfDocument = pdfiumCore.newDocument(fd);

    /// OPEN FIRST PAGE
    pdfiumCore.openPage(pdfDocument, INT_OF_PAGE_TO_OPEN);

    /// Find Imageview
    ImageView img = findViewById(R.id.imageView2);

    /// GET PAGES OF FILE
     int currentPagesOnPDF    =    pdfiumCore.getPageCount(pdfDocument);

     /// ADD MULTIPLIERS TO INCREASE THE PDF PIXEL QUALITY
      int width = pdfiumCore.getPageWidthPoint(pdfDocument, tmploop); // *2 ? for double pixel size
      int height = pdfiumCore.getPageHeightPoint(pdfDocument, tmploop); // *2 ? for double pixel size

      Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
       pdfiumCore.renderPageBitmap(pdfDocument, bmp, INT_OF_PAGE_TO_OPEN, 0, 0, width, height);

       /// SET RENDERED PAGE TO VIEW
       img.setImageBitmap(bmp);

       //Close Document when render is done
       pdfiumCore.closeDocument(pdfDocument);

You can put this code in your mainactivity, you need to apply functions as site-changing and other stuff by yourself...

Tribute to the Programmers:
https://github.com/barteksc/AndroidPdfViewer
https://github.com/chrisbanes/PhotoView