B4A Library Printing and Pdf creation

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Erel

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This is an Android 4.4+ (API 19+) library.

Its two main features are:
1. Creating Pdf documents with the PdfDocument object.
2. Printing with the Printer object.

Lets start with PdfDocument.

B4X:
Dim pdf As PdfDocument
pdf.Initialize
pdf.StartPage(595, 842) 'A4 size
pdf.Canvas.DrawLine(2, 2, 593 , 840, Colors.Blue, 4)
pdf.Canvas.DrawText("Hello", 100, 100, Typeface.DEFAULT_BOLD, 30 / GetDeviceLayoutValues.Scale , Colors.Yellow, "CENTER")
pdf.FinishPage
Dim out As OutputStream = File.OpenOutput(File.DirInternal, "1.pdf", False)
pdf.WriteToStream(out)
out.Close
pdf.Close
1. Initialize.
2. Call StartPage to add a new page. The page size is measured in 1 / 72th inch.
3. Use the Canvas object to draw on the page. Note that you shouldn't use 'dip' units here.
You should divide the text size with GetDeviceLayoutValues.Scale when calling Canvas.DrawText.
4. Call FinishPage.
5. Repeat the above 3 steps for each page.
6. Save the document to a file.
7. Close the pdf object.

Printing

upload_2017-2-28_15-3-28.png


The printing feature is based on the OS printing framework. Most popular printers are supported. You do need to first install a printer plug-in.

For example to print to a HP printer: https://play.google.com/store/apps/details?id=com.hp.android.printservice

Cannon: https://play.google.com/store/apps/details?id=jp.co.canon.android.printservice.plugin

The Printer object can print bitmaps, html documents, WebView content and PDF documents.

Example:
B4X:
Sub Globals
   Private printer As Printer
End Sub

Sub Activity_Create(FirstTime As Boolean)
   printer.Initialize("")
   Print
End Sub

Sub Print
   printer.PrintHtml("job", $"<b>Hello world!!!</b><br/>
<h1>second line</h1>
<img src="${WebViewAssetFile("smiley.png")}"/>"$)
End Sub

Sub WebViewAssetFile (FileName As String) As String
   Dim jo As JavaObject
   jo.InitializeStatic("anywheresoftware.b4a.objects.streams.File")
   If jo.GetField("virtualAssetsFolder") = Null Then
     Return "file:///android_asset/" & FileName.ToLowerCase
   Else
     Return "file://" & File.Combine(jo.GetField("virtualAssetsFolder"), _
  jo.RunMethod("getUnpackedVirtualAssetFile", Array As Object(FileName)))
   End If
End Sub
The WebViewAssetFile is a utility sub that creates the url of an asset file (the url depends on the compilation mode).

Updates:

V1.11 - PrintPdf2 - Allows passing custom PrintAttributes, created with JavaObject.
V1.10 - Adds support for printing PDF documents:
B4X:
Printer.PrintPdf("Job Name", File.DirAssets, "My Document.pdf")
 

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HAH

Active Member
Licensed User
Excellent, that what we was waiting for a looooong time ...
 

Tayfur

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lucdrb

Member
Licensed User
Hi,

Should I've missing something, I get this error message after Pdf.Initialize:

java.lang.NoClassDefFoundError: android.graphics.pdf.PdfDocument

Luc
 

LucianDesign

Member
Licensed User
Hi,

Should I've missing something, I get this error message after Pdf.Initialize:

java.lang.NoClassDefFoundError: android.graphics.pdf.PdfDocument

Luc
This is an Android 4.4+ (API 19+) library. You must have in your manifest file minSdkVersion = 19.
B4X:
<uses-sdk android:minSdkVersion="19" android:targetSdkVersion="23"/>
 

menneaduplo

Member
Licensed User
Hi,
i installed B4a 6.80 and i tried to add the library printing.jar at my project.
When compiling appears: "Maven artifact not found: com.android.support/support-v4".
The API seems ok.
<uses-sdk android:minSdkVersion="19" android:targetSdkVersion="23"/>

Thanks
 

bocker77

Member
Licensed User
With the printing code I can only print a file from the assets folder. Can I also print from let's say DirDefaultExternal folder and if so how?
 

luciano deri

Active Member
Licensed User
Hy, i'm creating a PDF document i A4, but the is non the same result with two different device. I think that is a scaled problem. But a pdf document must not scaled ever. I not user dip unit musure but only integer value.
 

Tayfur

Well-Known Member
Licensed User
Hy, i'm creating a PDF document i A4, but the is non the same result with two different device. I think that is a scaled problem. But a pdf document must not scaled ever. I not user dip unit musure but only integer value.
I had same problem; and screen resolations are diffrent for each device.

@Erel 's advice is "GetDeviceLayoutValues.Scale"

pdf.Canvas.DrawText("Hello", 100, 100, Typeface.DEFAULT_BOLD, 30 / GetDeviceLayoutValues.Scale , Colors.Yellow, "CENTER")


My question is same , See link :
https://www.b4x.com/android/forum/threads/problem-with-pdf-in-printing-library.77654/#post-493717

thanks
 
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