Android Question Text color when using TextWriter

TonyVerberne · May 16, 2015

Is it possible to control the color of text using TextWriter.WriteLine and then view it in a message box?

eurojam · May 16, 2015

TextWriter.WriteLine writes text to the underlying stream, like a external textfile. you can pass the line anyway to a message box where you can set the color to the desired color. but directly setting the color is not possible, I think...
see https://www.b4x.com/android/help/files.html#textwriter

TonyVerberne · May 16, 2015

eurojam said:
TextWriter.WriteLine writes text to the underlying stream, like a external textfile. you can pass the line anyway to a message box where you can set the color to the desired color. but directly setting the color is not possible, I think...
see https://www.b4x.com/android/help/files.html#textwriter

Thanks. Its a pity that isn't possible.

Erel · May 17, 2015

I think that there is some confusion. TextWriter has nothing to do with the text appearance. It converts string characters to bytes and writes them to a stream.

TonyVerberne · May 17, 2015

Erel said:
I think that there is some confusion. TextWriter has nothing to do with the text appearance. It converts string characters to bytes and writes them to a stream.

Thanks Erel but is there a way to control text appearance in the way that I have described? I have written a shopping list app for my own use actually. It works quite well (I think) but would benefit from being able to change text color when writing the list so that I can distinguish items in different parts of the store.
Having fun anyway. Tony

Erel · May 17, 2015

Yes. You can display text with different colors.

There are several ways to do it. One way is to use RichString library: https://www.b4x.com/android/forum/threads/richstring-library.10680/#content

TonyVerberne · May 18, 2015

Erel said:
Yes. You can display text with different colors.

There are several ways to do it. One way is to use RichString library: https://www.b4x.com/android/forum/threads/richstring-library.10680/#content

Thanks Erel.
I will check it out.
Tony

TonyVerberne · May 24, 2015

Hi Erel I took up your suggestion. I have used the following code inside a spinner:

B4X:

rsb.Initialize
    rs.Initialize("{R}{T}{Blue}{U}Fruit{R}{T}{Blue}{U}{R}{T}{Blue}{U}Aisle{U}{Blue}{T}{R}")
    rs.Color2(Colors.Blue,"{Blue}")
    rs.RelativeSize2(1.5, "{R}")
    rs.Typeface2("serif", "{T}")
    rs.Underscore2("{U}")
    rs.Color2(Colors.Red, "{Red}")
    rs.Style2(rs.STYLE_BOLD_ITALIC, "{BI}")

rsb.Append(rs)
    Text1 = SpinnerFruit.selectedItem
    outFile.Initialize(File.OpenOutput(File.DirRootExternal, "Text1.txt", True))
outFile.WriteLine(rs)
    outFile.Close

When I look at the richstring (rs) it's formatted as I want it in colour. But when I write the string to my text file it becomes plain unformatted text.

Is it because WriteLine can't handle the formatted text?

DonManfred · May 24, 2015

TonyVerberne said:
But when I write the string to my text file it becomes plain unformatted text.

Erel said:
I think that there is some confusion. TextWriter has nothing to do with the text appearance.

So, when you save the file and load it back you need to use build the richstring with your text again to display it formatted i think (dont have used richstring)

You cannot store a formatted richstring to a textfile.

TonyVerberne · May 24, 2015

This is a serious limitation of TextWriter. Is there another way to write formatted text to a file I wonder?

Thanks for you comments DonManfred!

NJDude · May 24, 2015

Since you are saving individual formatted lines, you could use a MAP to save the formatted lines, for example:

B4X:

myMap.Put("1", rs) 'Where "1" is the line number or any other value you want to use as a key.

And to retrieve the formatted line:

B4X:

myLabel.Text = myMap.Get("1")

That's an idea.

TonyVerberne · May 25, 2015

Thanks - I'll give it a try.

Android Question Text color when using TextWriter

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