一、报错信息

在 ConstraintLayout 约束布局中 , 引入了自定义 View 后 , 整个 Design 图形化操作界面没了 , 报错信息如下 :

java.lang.IllegalStateException: View with id -1: com.example.MyView#onMeasure() did not set the measured dimension by calling setMeasuredDimension()at android.view.View.measure_Original(View.java:25786)at android.view.View_Delegate.measure(View_Delegate.java:80)at android.view.View.measure(View.java:25737)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.solverMeasure(BasicMeasure.java:372)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_Original(ConstraintLayout.java:1708)at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java)at android.view.View.measure_Original(View.java:25773)at android.view.View_Delegate.measure(View_Delegate.java:80)at android.view.View.measure(View.java:25737)at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6980)at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)at android.view.View.measure_Original(View.java:25773)at android.view.View_Delegate.measure(View_Delegate.java:80)at android.view.View.measure(View.java:25737)at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:735)at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:481)at android.view.View.measure_Original(View.java:25773)at android.view.View_Delegate.measure(View_Delegate.java:80)at android.view.View.measure(View.java:25737)at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6980)at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)at android.view.View.measure_Original(View.java:25773)at android.view.View_Delegate.measure(View_Delegate.java:80)at android.view.View.measure(View.java:25737)at com.android.layoutlib.bridge.impl.RenderSessionImpl.measureView(RenderSessionImpl.java:657)at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:375)at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:436)at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:121)at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:717)at com.android.tools.idea.rendering.RenderTask.lambda$inflate$9(RenderTask.java:873)at com.android.tools.idea.rendering.RenderExecutor$runAsyncActionWithTimeout$3.run(RenderExecutor.kt:192)at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)at java.base/java.lang.Thread.run(Thread.java:829)

二、解决方案

出现上述报错问题 , 是由于在自定义 View 或 ViewGroup 的 onMeasure() 方法中没有调用 setMeasuredDimension() 方法导致的 ;

实现 onMeasure() 方法时，需要调用 setMeasuredDimension() 来设置 View 或 ViewGroup 的测量宽度和高度。

如果您没有调用 setMeasuredDimension()，则会发报 “View#onMeasure() did not set the measured dimension by calling setMeasuredDimension()” 警告，并且该视图可能无法正常显示。

以下是一个示例，在这个示例中，自定义 View 的 onMeasure() 方法调用了 setMeasuredDimension() 来设置 View 的测量宽度和高度。

class CustomView(context: Context, attrs: AttributeSet?) : View(context, attrs) {override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {// Measure the view's widthval width = MeasureSpec.getSize(widthMeasureSpec)// Calculate the view's height based on the width and aspect ratioval aspectRatio = 0.75fval height = (width * aspectRatio).toInt()// Set the measured dimensionssetMeasuredDimension(width, height)}
}

在上述示例中 :

首先 , 使用 MeasureSpec.getSize() 方法来获取视图的宽度。
然后 , 使用一个固定的宽高比（0.75f）计算出视图的高度。
最后 , 调用 setMeasuredDimension() 方法来设置视图的测量宽度和高度。

实现 onMeasure() 方法时，必须在最后调用 setMeasuredDimension() 来设置视图的测量宽度和高度。

否则，会报 “View#onMeasure() did not set the measured dimension by calling setMeasuredDimension()” 警告，并且视图可能无法正常显示。

在本案例中 , 源码如下 :

import android.content.Context
import android.util.AttributeSet
import android.view.LayoutInflater
import androidx.constraintlayout.widget.ConstraintLayoutclass MyView(context: Context, attrs: AttributeSet?) : ConstraintLayout(context, attrs) {init {val inflater = LayoutInflater.from(context)inflater.inflate(R.layout.item_left_path, this, true)}override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {// Your layout code here}override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {// Your measure code here}
}

如果没有使用到布局 / 测量逻辑 , 直接将这两个函数删除 ;

import android.content.Context
import android.util.AttributeSet
import android.view.LayoutInflater
import androidx.constraintlayout.widget.ConstraintLayoutclass MyView(context: Context, attrs: AttributeSet?) : ConstraintLayout(context, attrs) {init {val inflater = LayoutInflater.from(context)inflater.inflate(R.layout.item_left_path, this, true)}
}

经过上述修改 , 报错消失 ;

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【错误记录】Android Studio 布局文件报错 ( View with id -1: xx.MyView#onMeasure() did not set the measured dime )

文章目录

一、报错信息

二、解决方案

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