Generate PDF page thumbnails in Android

Apryse's library provides a page thumbnail dialog which shows thumbnails of all PDF document pages. Fore more information, see thumbnail browser .

With PDFViewCtrl, you can get a thumbnail Bitmap image for each page in a PDF document.

The following example request thumbnail for page 3:

Java

pdfViewCtrl.addThumbAsyncListener(new PDFViewCtrl.ThumbAsyncListener() {
    @Override
    public void onThumbReceived(int page, int[] buf, int width, int height) {
        try {
            Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(buf, 0, width, 0, 0, width, height);
            // use the bitmap 
        } catch (OutOfMemoryError oom) {
            // error
        }
  }
});

// request thumbnail for page 3
pdfViewCtrl.getThumbAsync(3);

Kotlin

pdfViewCtrl.addThumbAsyncListener(object:PDFViewCtrl.ThumbAsyncListener() {
    fun onThumbReceived(page:Int, buf:IntArray, width:Int, height:Int) {
        try {
            val bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888).apply { 
                this.setPixels(buf, 0, width, 0, 0, width, height)
            }
        } catch (oom:OutOfMemoryError) {
            // error
        }
    }
})

// request thumbnail for page 3
pdfViewCtrl.getThumbAsync(3)

where pdfViewCtrl is an instance of PDFViewCtrl.

It is recommended you cancel all thumbnail requests once they are no longer needed. To cancel all thumbnail request, use PDFViewCtrl.cancelAllThumbRequests().