onAttachedToWindow () 和 onDetachedFromWindow ()
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protected void onAttachedToWindow()
This is called when the view is attached to a window. At this point it has a Surface and will start drawing. Note that this function is guaranteed to be called before
onDraw(android.graphics.Canvas)
, however it may be called any time before the first onDraw -- including before or afteronMeasure(int, int)
.See Also
onDetachedFromWindow()
如果你在自己的view中Override了这个方法。那么我们最关注的是它什么时候调用?
从开发文档中我们可以看出,onAttachedToWindow是在第一次onDraw前调用的。也就是我们写的View在没有绘制出来时调用的,但只会调用一次。
比如,我们写状态栏中的时钟的View,在onAttachedToWindow这方法中做初始化工作,比如注册一些广播等等……
与onAttachedToWindow 相反的则是这个方法:
protected void onDetachedFromWindow()
Since: API Level 1
This is called when the view is detached from a window. At this point it no longer has a surface for drawing.
See Also
onAttachedToWindow()
开发文档就简单的两句。也就是我们销毁View的时候。我们写的这个View不再显示。
这时我们就在这个方法做一些收尾工作,如:取消广播注册等等。
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