Android SurfaceView

最近自己做了个指南针应用，用到了SurfaceView。总结下Surfaceview与View的区别：

（因为写程序时是用英语写的注释和笔记，这里就贴英语的，但是本人英语不是很好。）

 

SurfaceView VS View

SurfaceView has an instance of Surface which can use OS background thread to
handle onto a raw buffer that is being managed by the screen compositor.

Because of Surface, SurfaceView has two main difference from View:
1. SurfaceView can draw canvas in background thread, not UI thread.
2. SurfaceView can use OpenGL(via Surface) which can draw 3D object
  and use Hardware Acceleration to have a faster drawing.

Therefore, if we have to use 3D or high FPS(Frame per Second) performance,
use SurfaceView; otherwise use View.

 

Something about Surfaceview native code

Android graphic engine -- Skia -- main class type SkCanvas

View.invalidate() --- Android framework --- View.onDraw() --- Nativecode draw on SkCanvas

SurfaceHolder.lockCanvas() to get SkCanvas --- Nativecode draw on SkCanvas --- SurfaceHolder.unlockCanvasAndPost()

 

refer to:

http://branda.to/~thinker/GinGin_CGI.py/show_id_doc/404