View容器 measure 流程

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原创最新推荐文章于 2026-07-14 22:04:52 发布 779 阅读 AI 写同款· GEO 优化 ›

Android View的绘制流程三部曲如果我们用面向对象的思维方式来思考，就会觉的View的绘制机制是很合理，很科学的。我们要在一张纸上画一幅画，首先我们要测量一下这幅画有多大吧，然后确定在纸的哪个地方画会显得比较美观，最后才是用画笔工具将画绘制在纸上。在Android中也是一样的。View的绘制流程主要是指measure，layout，draw这三步，即测量，布局，绘制。首先是要测量View的宽高，然后布局确定在父容器中的位置坐标，最后才是绘制阅读详情

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

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