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android中view的生命周期

2016-03-22 17:17 417 查看

请参见：http://ndquangr.blogspot.jp/2013/04/android-view-lifecycle.html


Category	Methods	Description
Creation	Constructors	There is a form of the constructor that are called when the view is created from code and a form that is called when the view is inflated from a layout file. The second form should parse and apply any attributes defined in the layout file.
`onFinishInflate()`	Called after a view and all of its children has been inflated from XML.
Layout	`onMeasure(int, int)`	Called to determine the size requirements for this view and all of its children.
`onLayout(boolean, int, int, int, int)`	Called when this view should assign a size and position to all of its children.
`onSizeChanged(int, int, int, int)`	Called when the size of this view has changed.
Drawing	`onDraw(android.graphics.Canvas)`	Called when the view should render its content.
Eventprocessing	`onKeyDown(int, KeyEvent)`	Called when a new hardware key event occurs.
`onKeyUp(int, KeyEvent)`	Called when a hardware key up event occurs.
`onTrackballEvent(MotionEvent)`	Called when a trackball motion event occurs.
`onTouchEvent(MotionEvent)`	Called when a touch screen motion event occurs.
Focus	`onFocusChanged(boolean, int, android.graphics.Rect)`	Called when the view gains or loses focus.
`onWindowFocusChanged(boolean)`	Called when the window containing the view gains or loses focus.
Attaching	`onAttachedToWindow()`	Called when the view is attached to a window.
`onDetachedFromWindow()`	Called when the view is detached from its window.
`onWindowVisibilityChanged(int)`	Called when the visibility of the window containing the view has changed.

* [改变可见性]
* --> 构造View
* -->  onFinishInflate
* -->  onAttachedToWindow
* -->  onMeasure
* -->  onSizeChanged
* -->  onLayout
* -->  onDraw
* -->  onDetackedFromWindow
*
*
*
1、onFinishInflate() 当View中所有的子控件均被映射成xml后触发 。
2、onMeasure( int , int ) 确定所有子元素的大小 。
3、onLayout( boolean , int , int , int , int ) 当View分配所有的子元素的大小和位置时触发 。
4、onSizeChanged( int , int , int , int ) 当view的大小发生变化时触发 。
5、onDraw(Canvas) view渲染内容的细节。
6、onKeyDown( int , KeyEvent) 有按键按下后触发 。
7、onKeyUp( int , KeyEvent) 有按键按下后弹起时触发 。
8、onTrackballEvent(MotionEvent) 轨迹球事件 。
9、onTouchEvent(MotionEvent) 触屏事件 。
10、onFocusChanged( boolean , int , Rect) 当View获取或失去焦点时触发 。
11、onWindowFocusChanged( boolean ) 当窗口包含的view获取或失去焦点时触发 。
12、onAttachedToWindow() 当view被附着到一个窗口时触发 。
13、onDetachedFromWindow() 当view离开附着的窗口时触发，Android123提示该方法和 onAttachedToWindow() 是相反的。
14、onWindowVisibilityChanged( int ) 当窗口中包含的可见的view发生变化时触发。

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