Android PdfDocument file size

Question

I want to generate a PDF File from a View using the PdfDocument android class introduced in KitKat. I managed to do it, and the file is so far generated ok, end

Answer 1

Using PDFDocument, be sure to downscale your images prior to drawing them in the canvas.

When drawing to the screen, this is enough to scale the bitmap :

canvas.drawBitmap(bmp, src, dst, paint);

However, when using the canvas from PdfDocument.Page.getCanvas, this canvas will not downscale the bitmap, it will just squeeze it into a smaller zone. Instead you should do something like this:

// Scale bitmap : filter = false since we are always downSampling
Bitmap scaledBitmap = Bitmap.createScaledBitmap(bmp, dstWidth, dstHeight,
    false); // filter=false if downscaling, true if upscaling

canvas.drawBitmap(scaledBitmap, null, dst, paint);

scaledBitmap.recycle();

This is embedded in Android so it is much easier than using a third-party library. (The above was tested on a Marshmallow platform)