Android Question Set font scale to Large

[cooperlegend]

Hi, does anyone know a method to set the font scale to large via code ?

Thanks in advance

John

 

[ilan]

hi

do you mean to change the font size in android settings through your app? or change the font size only for your app?

 

[cooperlegend]

Hi

I have a requirement to change the font scale in the android settings, but this needs to be done by code.

The customer has a large number of devices which need setting up so running this as part of setup rather than manually having to do this is desired

Thanks

John

 

[ilan]

i know that u can get the font size via Accessiblity lib but change it i guess you could do it via JavaObject

this is the code to get the fontscale

Dim fscale As Double
Dim access As Accessiblity 
    
fscale = access.GetUserFontScale

 

[cooperlegend]

Yes. Reading is not a problem.
Writing is. I don't code in java so I am not sure what is needed.
Any help please?

 

[lemonisdead]

I have found this if someone is good enough in JavaObject (I can't make it work, I am not good) : http://stackoverflow.com/a/25761545

 

[lemonisdead]

Got it, thanks to @corwin42 : https://www.b4x.com/android/forum/threads/phone-display-brightness.13021/#post-83857

Needs :
- Phone (only for example)
- Reflection library

And in the Manifest

AddPermission("android.permission.WRITE_SETTINGS")

Call

Dim P As Phone
Log($"Current: ${P.GetSettings("FONT_SCALE")}"$)

    Dim value As Float = 4
    WriteSetting("FONT_SCALE", value)

Log($"After: ${P.GetSettings("FONT_SCALE")}"$)

Sub WriteSetting(Setting As String, Value As Float)
   Dim r1 As Reflector
   Dim args(3) As Object
   Dim types(3) As String

   r1.Target = r1.GetContext
 
   args(0) = r1.RunMethod("getContentResolver")
   types(0) = "android.content.ContentResolver"
   args(1) = Setting
   types(1) = "java.lang.String"
   args(2) = Value
   types(2) = "java.lang.float"
   r1.RunStaticMethod("android.provider.Settings$System", "putFloat", args, types)
End Sub

 

[cooperlegend]

Excellent, many thanks for all your help with this one

I actually wrote this into a library just as a learning exercise.

It works fine after device is rebooted.

Only issue is that even though the font is larger, the system settings screen still shows "Tiny"