Graphics

[Akil Kumar]

I am novice to android application development. In all these weather applications how it is continuously able to update the temperature and show a graphical representation.
Are those graphs plotted using 2D/3D android graphics library or using bitmap library.
For instance in that Ringdroid app while creating a customized ring tones how that graphical representation is shown?

Are there any specific tutorials or books available to specialize the topics related to this? Please help me.

Thanks,