Android Question Wordwrap to a canvas

[B4AinNY]

Hi, I'm trying to find a way to print some long string on a canvas with wordwrapping.
Eventually I'll be sending this canvas to a standard 8.5 x 11 inch printer.

I have seen the post
https://www.b4x.com/android/forum/threads/draw-multiline-text-on-canvas.42933/
which is great if you know where to put the CRLF, but what if you just have a long
string without embedded CRLF. Is there some useful approach someone could suggest.

So I have

' Create a bitmap ( bdw ) to draw on, and then initialize it
Dim bdw As Bitmap ' This is the Bitmap we are drawing on
Dim Const intPageWidth As Int = 850dip
Dim Const intPageHeight As Int = 1100dip
Dim Const intOneInch As Int = 100dip
bdw.InitializeMutable( pageWidth, pageHeight)

Dim strLngStr as String = " ...... this may be a few paragraphs "​

Now if this string could fit on a single printed line I could write

intLeft = pageWidth /2 ,
cvs.DrawText("strLngStr",intLeft, intTop, _

Typeface.DEFAULT_BOLD, 20, Colors.Blue, "CENTER")​

But let's say I want to fit into a box with a 15% of the pagewidth
I don't know how much text fits in that width so I don't know
where to break the lines.

Any ideas ?

- Jeff

 

[Erel]

Please use [code]code here...[/code] tags when posting code.

Add the text to a label (use StringUtils.MeasureMultilineTextHeight to set its height). Then draw the label to the canvas with Canvas.DrawView.

 

[LucaMs]

Then draw the label to the canvas with Canvas.DrawView

There isn't a DrawView method

 

[Erel]

How can it be? It is very useful.

Here:

Sub DrawView (cvs As Canvas, v As View)
   Dim cjo As JavaObject = cvs
   Dim jv As JavaObject = v
   jv.RunMethod("draw", Array(cjo.GetFieldJO("canvas")))
End Sub

Example:

Sub Activity_Click
   Dim c As Canvas
   c.Initialize(Activity)
   DrawView(c, Label1)
   Activity.Invalidate
End Sub

Quoting Android documentation:
"The view must have already done a full layout before this function is called."

 

[LucaMs]

There isn't a DrawView method

Now there is

 

[LucaMs]

Quoting Android documentation:
"The view must have already done a full layout before this function is called."

Ehm... I tried. I have changed the label height at runtime, accordingly to the string length as you rightly suggested, but then I had to add an Activity.Invalidate and...
the "infamous" DoEvents

 

[Erel]

You should use CallSubDelayed instead of DoEvents.

 

[LucaMs]

You should use CallSubDelayed instead of DoEvents.

Why? I call the drawing routine from a button click event, not from Activity_Create.

 

[Erel]

You need to call Activity.Invalidate. You shouldn't call DoEvents. If it doesn't work without DoEvents then you can use CallSubDelayed to achieve the same result.