android View.measure

最新推荐文章于 2021-05-31 14:46:13 发布
转载 最新推荐文章于 2021-05-31 14:46:13 发布 · 841 阅读 · 0
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#android

本文介绍了在Android中如何在构建View之前获取其宽度和高度的方法。需要先使用measure方法进行测量，该方法接受两种测量模式：UNSPECIFIED(不限定)、EXACTLY(固定)、AT_MOST(最多)。通过调用getMeasuredWidth()和getMeasuredHeight()来获取测量后的值。

在还没有构建View 之前无法取得View的度宽。 

在此之前我们必须选 measure 一下. 


测量的三种模式： 
UNSPECIFIED: 不限定 
EXACTLY: 固定 
AT_MOST:最多 

view.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED); 
measure()后调用getMeasuredWidth()和getMeasuredHeight()得到测量后的值。
mryangbo001
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android中View.measure方法详解
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View 源码路径 frameworks\base\core\java\android\view\View.java 源码中国链接：http://www.oschina.net/code/explore/android-2.2-froyo/android/view/View.java public final void measure(int widthMeasureSpec, in
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### 三级标题：Android App Crash：FATAL EXCEPTION: main, InflateException Error inflating class unknown in ConstraintLayout with DataBindingUtil 在 Android 应用开发过程中，使用 `ConstraintLayout` 和 `...
├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄ │ [1765179873389], [main]app crash: │ java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid view holder adapter positionBaseViewHolder{2e32e3e position=3 id=-1, oldPos=3, pLpos:-1 scrap [attachedScrap] tmpDetached no parent} androidx.recyclerview.widget.RecyclerView{747ba37 VFED..... ......I. 24,1665-1056,2853 #7f0a31a2 app:id/rv_module_cards alpha=1.0 viewInfo = }, adapter:com.tplink.mercusys.component.dashboard.adapter.OverviewSupportModuleAdapter@1bae9cc, layout:androidx.recyclerview.widget.GridLayoutManager@1d13ba4, context:com.tplink.mercusys.component.dashboard.view.MainActivity@c85551e │ at androidx.recyclerview.widget.RecyclerView$Recycler.validateViewHolderForOffsetPosition(RecyclerView.java:6590) │ at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6796) │ at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6757) │ at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6753) │ at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2362) │ at androidx.recyclerview.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:584) │ at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1622) │ at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:687) │ at androidx.recyclerview.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:182) │ at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep1(RecyclerView.java:4591) │ at androidx.recyclerview.widget.RecyclerView.onMeasure(RecyclerView.java:4016) │ at android.view.View.measure(View.java:28719) │ at androidx.constraintlayout.widget.ConstraintLayout$Measurer.measure(ConstraintLayout.java:811) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.measure(BasicMeasure.java:466) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.measureChildren(BasicMeasure.java:134) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:278) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:120) │ at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1594) │ at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1708) │ at android.view.View.measure(View.java:28719) │ at androidx.core.widget.NestedScrollView.measureChildWithMargins(NestedScrollView.java:1941) │ at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) │ at androidx.core.widget.NestedScrollView.onMeasure(NestedScrollView.java:650) │ at android.view.View.measure(View.java:28719) │ at com.scwang.smart.refresh.layout.SmartRefreshLayout.onMeasure(SmartRefreshLayout.java:598) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7138) │ at androidx.coordinatorlayout.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:795) │ at com.google.android.material.appbar.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:100) │ at com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:2376) │ at androidx.coordinatorlayout.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:866) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7138) │ at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) │ at android.view.View.measure(View.java:28719) │ at androidx.constraintlayout.widget.ConstraintLayout$Measurer.measure(ConstraintLayout.java:811) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:632) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.layout(ConstraintWidgetContainer.java:733) │ at androidx.constraintlayout.core.widgets.an │ alyzer.BasicMeasure.solveLinearSystem(BasicMeasure.java:160) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:291) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:120) │ at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1594) │ at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1708) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7138) │ at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) │ at android.view.View.measure(View.java:28719) │ at androidx.constraintlayout.widget.ConstraintLayout$Measurer.measure(ConstraintLayout.java:811) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:632) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.layout(ConstraintWidgetContainer.java:733) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.solveLinearSystem(BasicMeasure.java:160) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:291) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:120) │ at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1594) │ at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1708) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7138) │ at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) │ at android.view.View.measure(View.java:28719) │ at androidx.constraintlayout.widget.ConstraintLayout$Measurer.measure(ConstraintLayout.java:811) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:632) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.layout(ConstraintWidgetContainer.java:733) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.solveLinearSystem(BasicMeasure.java:160) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:291) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:120) │ at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1594) │ at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1708) │ at android.view.View.measure(View.java:28719) │ at androidx.drawerlayout.widget.DrawerLayout.onMeasure(DrawerLayout.java:1156) │ at android.view.View.measure(View.java:28719) │ at androidx.constraintlayout.widget.ConstraintLayout$Measurer.measure(ConstraintLayout.java:811) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.measure(BasicMeasure.java:466) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.measureChildren(BasicMeasure.java:134) │ at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:278) │ at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:120) │ at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1594) │ at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1708) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7138) │ at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) │ at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:145) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7138) │ at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1608) │ at android.widget.LinearLayout.measureVertical(LinearLayout.java:878 │ ) │ at android.widget.LinearLayout.onMeasure(LinearLayout.java:721) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7138) │ at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7138) │ at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1608) │ at android.widget.LinearLayout.measureVertical(LinearLayout.java:878) │ at android.widget.LinearLayout.onMeasure(LinearLayout.java:721) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7138) │ at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) │ at com.android.internal.policy.DecorView.onMeasure(DecorView.java:808) │ at android.view.View.measure(View.java:28719) │ at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:5406) │ at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:3647) │ at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3997) │ at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:3305) │ at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:11487) │ at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1621) │ at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1630) │ at android.view.Choreographer.doCallbacks(Choreographer.java:1154) │ at android.view.Choreographer.doFrame(Choreographer.java:1043) │ at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1604) │ at android.os.Handler.handleCallback(Handler.java:973) │ at android.os.Handler.dispatchMessage(Handler.java:100) │ at android.os.Looper.loopOnce(Looper.java:282) │ at android.os.Looper.loop(Looper.java:387) │ at android.app.ActivityThread.main(ActivityThread.java:9500) │ at java.lang.reflect.Method.invoke(Native Method) │ at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:600) │ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1005) └────────────────────────────────────────────────────────────────────────────────────────────────────────────────
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前言上一篇文章，笔者主要讲述了DecorView以及ViewRootImpl相关的作用，这里回顾一下上一章所说的内容：DecorView是视图的顶级View，我们添加的布局文件是它的一个子布局，而ViewRootImpl则负责渲染视图，它调用了一个performTraveals方法使得ViewTree开始三大工作流程，然后使得View展现在我们面前。本篇文章主要内容是：详细讲述View的测量(Me...
Android的View体系（五）：Measure过程
微不足道的博客
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view的measure过程分为单一view的measure过程、viewGroup的measure过程。对于单一view，只针对view本身；对于viewGroup，是对视图中所有的子view都进行测量，即遍历调用所有view的measure。
Android Measure 体系简单总结
fyfcauc的专栏
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Android对View的测量是半协商半强制半模糊半具体的. 测量过程中的两套尺寸体系: [半强制] ParentView**约束ChildView: **MeasureSpec(通过measure方法传递给ChildView, MeasureSpec本身包含了两类信息: SpecMode和SpecSize): SpecMode = EXACTLY: 给ChildView指定了具体尺寸[半具体]
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