Android Question HTML to Bitmap to PDF Question

[GEoffT]

I have a document stored in an HTML file which I wish to add to a PDF.

I am reading the HTML into a string.
Loading it to a webview
Using Webview.CAptureBitmap
then using pdf.canvas.drawbitmap

But I get the error "java.lang.IllegalArgumentException: width and height must be > 0"

on the webview1.capturebitmap line

    Dim     pdf As PdfDocument
    Dim webview1 As WebView
    Dim Bitmap1 As Bitmap
    Dim htmlFileString As String
    Dim Out As OutputStream

    Dim DestRect As Rect
    webview1.Initialize("")
    htmlFileString = File.ReadString(File.DirDefaultExternal, GlobFileName)
    pdf.Initialize
    pdf.StartPage(595, 842) 'A4 size

    webview1.LoadHtml(htmlFileString)
    webview1.Visible=True
    Out = File.OpenOutput(File.DirDefaultExternal, "Scorecard.png", False)
    webview1.CaptureBitmap.WriteToStream(Out, 100, "PNG")
    Out.Close
    Bitmap1.Initialize(File.DirDefaultExternal, "Scorecard.png")
    DestRect.Initialize(5,5,580,450)
    pdf.Canvas.DrawBitmap(Bitmap1,Null,DestRect)

Thanks in advance Geoff

 

[Erel]

But I get the error "java.lang.IllegalArgumentException: width and height must be > 0"

Please post the full error message including the line that caused the error.

 

[GEoffT]

Erel, Here is the full error message and line 1513 is this one

    webview1.CaptureBitmap.WriteToStream(Out, 100, "PNG")

Error occurred on line: 1513 (ScoringX10)
java.lang.IllegalArgumentException: width and height must be > 0
at android.graphics.Bitmap.createBitmap(Bitmap.java:933)
at android.graphics.Bitmap.createBitmap(Bitmap.java:912)
at android.graphics.Bitmap.createBitmap(Bitmap.java:879)
at anywheresoftware.b4a.objects.drawable.CanvasWrapper$BitmapWrapper.InitializeMutable(CanvasWrapper.java:654)
at anywheresoftware.b4a.objects.WebViewWrapper.CaptureBitmap(WebViewWrapper.java:131)
at net.tittensor.ToxToolbox.scoringx10._btnemailrecordsofficer_click(scoringx10.java:3292)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:735)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:360)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:260)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:175)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:171)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
at android.view.View.performClick(View.java:5197)
at android.view.View$PerformClick.run(View.java:20926)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5951)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
** Activity (scoringx10) Pause, UserClosed = true **
** Service (starter) Destroy (ignored)**

 

[Erel]

Change your code to:

 webview1.LoadHtml(htmlFileString)
    webview1.Visible=True
    Out = File.OpenOutput(File.DirDefaultExternal, "Scorecard.png", False)
    Wait For WebView1_PageFinished (Url As String)
    webview1.CaptureBitmap.WriteToStream(Out, 100, "PNG")

 

[GEoffT]

Thanks for that Erel. The behaviour has changed....The error message has disappeared, but the app now sits forever on the wait statement.

regards Geoff

 

[Erel]

Try to reproduce it in a small project and upload it.

 

[GEoffT]

THis small app does the same....it never gets to the "Log ("got here") statement

Thanks in adavnce. Geoff

P.s. I used the same HTML file, but moved it to the files folder since it is normally generated in code.

 

[Erel]

You must learn how events / wait for works. If you initialize WebView with:

webview1.Initialize("")

You will not be able to handle any event.

It should be:

webview1.Initialize("WebView1")

 

[GEoffT]

Thanks Erel...Should have know that!!!

Changed it and now back to the original error (in the sample program) i.e


Error occurred on line: 62 (Main)
java.lang.IllegalArgumentException: width and height must be > 0
at android.graphics.Bitmap.createBitmap(Bitmap.java:933)
etc

line 62 is the "webview1.CaptureBitmap.WriteToStream..."

 

[Erel]

There are missing files so I cannot test it here. Make sure that all files are added to the Files tab and upload the project again.

 

[GEoffT]

zip now includes the html file "sctemp.HTML"

Regards Geoff

 

[GEoffT]

I may have found the problem ... i did not set the webview.visible to true

 

[GEoffT]

I was wrong I still have a problem. with Error occurred on line: 62 (Main)
java.lang.IllegalArgumentException: width and height must be > 0
at android.graphics.Bitmap.createBitmap(Bitmap.java:933

 

[GEoffT]

I notice that a very similar problem is described in a very old discussion

https://www.b4x.com/android/forum/threads/webview1-capturebitmap-help.18767/

There does not appear to be a resolution in that thread.

 

[Erel]

This code works:

Wait For WebView1_PageFinished (Url As String)
   Log ("got here")
   Do While True
       Sleep(500)
       Try
           webview1.CaptureBitmap.WriteToStream(Out, 100, "PNG")
           Exit
       Catch
           Log(LastException)
       End Try
   Loop
   Log("WebView captured.")

 

[GEoffT]

Thank you once again Erel