android中view的生命周期

Posted 2020-06-16

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。