onRestoreInstanceState()

onRestoreInstanceState() is called only when recreating activity after it was killed by the OS. Such situation happen when:

  • orientation of the device changes (your activity is destroyed and recreated)
  • there is another activity in front of yours and at some point the OS kills your activity in order to free memory (for example). Next time when you start your activity onRestoreInstanceState() will be called.

用户极少有机会自己来调用OnDraw函数
如果数据内容改变,应该调用父窗口的UpdataData 或者是Invalidata函数,通知窗口内容已经发生了改变,系统自己来调用OnDraw函数处理这个改变消息。

Invalidate(Rect),只渲染Rect区域.Rect是一个矩形, Draw是在Invalidate调用时它才会被触发.

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

生活在西班牙

自己动手丰衣足食

BlueAsteroid

Just another WordPress.com site

Jing's Blog

Just another WordPress.com site

Start from here......

我的心情魔方

天才遠私廚

希望能做一個分享各種資訊的好地方

语义噪声

西瓜大丸子汤的博客

笑对人生,傲立寰宇

Just another WordPress.com site

Where On Earth Is Waldo?

A Project By Melanie Coles

the Serious Computer Vision Blog

A blog about computer vision and serious stuff

Cauthy's Blog

paper review...

Cornell Computer Vision Seminar Blog

Blog for CS 7670 - Special Topics in Computer Vision

datarazzi

Life through nerd-colored glasses

Luciana Haill

Brainwaves Augmenting Consciousness

槑烎

1,2,∞

Dr Paul Tennent

and the university of nottingham

turn off the lights, please

A bunch of random, thinned and stateless thoughts around the Web

%d bloggers like this: