Android Question Add symbols to a bitmap and save it

grafsoft · Apr 14, 2014

Hi,

I need to put numbers (or any other graphics) on a bitmap and save it with the symbols / numbers. Can this be done?

eps · Apr 14, 2014

I guess that this might not be what you want to achieve..? http://www.b4x.com/android/forum/threads/merging-imageviews-bitmaps-into-one.13639/#post-77121

Do you need to store them together or just view them as a single unit? A text file with two or more bitmaps could be used to store them together and then you just need to process it... but that might not be ideal.

klaus · Apr 14, 2014

Yes !
Define a bitmap object.
Load the original bitmap onto this bitmap.
Draw whatever you want with a Canvas onto the bitmap.
Save the bitmap.

grafsoft · Apr 15, 2014

Thank you, I will try.

grafsoft · Apr 20, 2014

I tried, but in vain.

I can see the text on the photo, but when I save it and later view it, the text is gone.

B4X:

     Main.outdir=File.combine (File.DirDefaultExternal,"5")
     Main.thepic="65.jpg"
     bitbg.Initialize (Main.outdir,Main.thepic)
     bdwBackground.Initialize(bitbg) 
     pnl.Initialize("pnl")
     Activity.AddView(pnl, 0, 0, 100%x, 85%y)
     cvs.Initialize (pnl)
     cvs.DrawText ("test",100dip,100dip,Typeface.DEFAULT_BOLD,50,Colors.Blue,"LEFT")
     Dim out As OutputStream
     out=File.OpenOutput (Main.outdir,"test.png",False)
     bitbg.WriteToStream (out,100,"PNG")
     out.Close

klaus · Apr 20, 2014

How did you read the image back ?
Do you have a small project showing the problem ?
It's difficult to answer with just a small code snippet. !

grafsoft · Apr 20, 2014

This is PERFECT SUPPORT! It's Easter Sunday!

The project is bigger, but all the code is in the activity "Paint", which is called at start of the program.

Thank you!

klaus · Apr 20, 2014

This code works:

B4X:

If FirstTime Then
    bitbg.Initialize(File.DirAssets,"Rose2.jpg" )
'    bitbg.Initialize(File.DirDefaultExternal,"test.png" )
    pnl.Initialize("pnl")
    Activity.AddView(pnl, 0, 0, 100%x, 85%y)
    Dim rectDest As Rect
    rectDest.Initialize(0, 0, pnl.Width, pnl.Height)
    cvs.Initialize (pnl)
    cvs.DrawBitmap(bitbg, Null, rectDest)
    cvs.DrawText ("test", 120dip, 120dip, Typeface.DEFAULT_BOLD, 50, Colors.Blue, "LEFT")
  
    Dim out As OutputStream
    out=File.OpenOutput (File.DirDefaultExternal,"test.png",False)
    ' test
    ' out=File.OpenOutput (Main.outdir,"test.png",False)
    cvs.Bitmap.WriteToStream (out,100,"PNG")
    out.Close
End If

And to test the result:

B4X:

If FirstTime Then
'    bitbg.Initialize(File.DirAssets,"Rose2.jpg" )
    bitbg.Initialize(File.DirDefaultExternal,"test.png" )
    pnl.Initialize("pnl")
    Activity.AddView(pnl, 0, 0, 100%x, 85%y)
    Dim rectDest As Rect
    rectDest.Initialize(0, 0, pnl.Width, pnl.Height)
    cvs.Initialize (pnl)
    cvs.DrawBitmap(bitbg, Null, rectDest)
'    cvs.DrawText ("test", 120dip, 120dip, Typeface.DEFAULT_BOLD, 50, Colors.Blue, "LEFT")
   
    Dim out As OutputStream
    out=File.OpenOutput (File.DirDefaultExternal,"test.png",False)
    ' test
    ' out=File.OpenOutput (Main.outdir,"test.png",False)
    cvs.Bitmap.WriteToStream (out,100,"PNG")
    out.Close
End If

In your code you had the image on the Activity background and you drew onto a Panel which are two different Bitmaps.

grafsoft · Apr 21, 2014

Thank you!

Android Question Add symbols to a bitmap and save it

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Android Question Add symbols to a bitmap and save it

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