View容器 measure 流程

最新推荐文章于 2025-04-21 21:14:03 发布

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本文详细解析了Android中几种常见布局（包括FrameLayout、LinearLayout、RelativeLayout和AbsoluteLayout）的onMeasure()方法实现过程。通过深入探讨measureChildWithMargins()、getChildMeasureSpec()、child.onMeasure()等关键步骤，以及resolveSizeAndState()和setMeasuredDimension()的作用，帮助读者理解视图如何确定其大小。

FrameLayout

onMeasure()

1.    measureChildWithMargins() ViewGroup.java
1.1   getChildMeasureSpec()     ViewGroup.java
1.2   child.measure()  View.java
1.2.1 chlid.onMeasure()

2. resolveSizeAndState() View.java
3. setMeasuredDimension() View.java

LinearLayout

onMeasure()

1.    measureChildWithMargins() ViewGroup.java
1.1   getChildMeasureSpec()     ViewGroup.java
1.2   child.measure()  View.java
1.2.1 chlid.onMeasure()

2. resolveSizeAndState() View.java
3. setMeasuredDimension() View.java

RelateveLayout

onMeasure()

1.    measureChild()            RelateveLayout.java
1.1   getChildMeasureSpec()     RelateveLayout.java
1.2   child.measure()  View.java
1.2.1 chlid.onMeasure()

2. resolveSizeAndState() View.java
3. setMeasuredDimension() View.java

AbsoluteLayout

onMeasure()

1.    measureChildren()         ViewGroup.java
1.1   getChildMeasureSpec()     ViewGroup.java
1.2   child.measure()  View.java
1.2.1 chlid.onMeasure()

2. resolveSizeAndState() View.java
3. setMeasuredDimension() View.java