Android Question Palette library (Palette.Builder)

[Eme Fibonacci]

Android has a library that generates a palette of colors from an image.

Please see:
http://developer.android.com/reference/android/support/v7/graphics/Palette.html

Does anyone have any idea how to use it with B4a?

 

[Erel]

Make sure to copy android-support-v7-palette.jar to the additional libraries folder:

#AdditionalJar: android-support-v7-palette
#AdditionalJar: android-support-v4
Sub Process_Globals
   'These global variables will be declared once when the application starts.
   'These variables can be accessed from all modules.

End Sub

Sub Globals
   'These global variables will be redeclared each time the activity is created.
   'These variables can only be accessed from this module.

End Sub

Sub Activity_Create(FirstTime As Boolean)
    GetPalette(LoadBitmap(File.DirAssets, "smiley.png"))
End Sub

Sub GetPalette(bmp As Bitmap)
   Dim jo As JavaObject
   jo.InitializeStatic("android.support.v7.graphics.Palette")
   Dim e As Object = jo.CreateEvent("android.support.v7.graphics.Palette.PaletteAsyncListener", _
     "generated", Null)
   jo.RunMethodJO("from", Array(bmp)).RunMethod("generate", Array(e))
End Sub

Sub Generated_Event (MethodName As String, Args() As Object) As Object
   Dim palette As JavaObject = Args(0)
   Log(palette.RunMethod("getDarkVibrantColor", Array(0)))
   Return Null
End Sub

 

[corwin42]

This is an old thread but if the information is still interesting. I just released a library for it:
https://www.b4x.com/android/forum/threads/palette-create-color-palette-from-bitmap.75033/#content