android - 我不明白为什么会收到此错误： android.view.InflateException: Binary XML file line #23 in com.whootis.hmmonitor:layout/activity_main

Question

神奇的是我突然得到了这个例外：

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.whootis.hmmonitor, PID: 23593
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.whootis.hmmonitor/com.whootis.hmmonitor.MainActivity}: android.view.InflateException: Binary XML file line #23 in com.whootis.hmmonitor:layout/activity_main: Binary XML file line #117: You must supply a layout_width attribute.
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
     Caused by: android.view.InflateException: Binary XML file line #23 in com.whootis.hmmonitor:layout/activity_main: Binary XML file line #117: You must supply a layout_width attribute.
     Caused by: java.lang.UnsupportedOperationException: Binary XML file line #117: You must supply a layout_width attribute.
        at android.content.res.TypedArray.getLayoutDimension(TypedArray.java:829)
        at android.view.ViewGroup$LayoutParams.setBaseAttributes(ViewGroup.java:7932)
        at android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:8130)
        at androidx.constraintlayout.widget.ConstraintLayout$LayoutParams.<init>(ConstraintLayout.java:2649)
        at androidx.constraintlayout.widget.ConstraintLayout.generateLayoutParams(ConstraintLayout.java:1972)
        at androidx.constraintlayout.widget.ConstraintLayout.generateLayoutParams(ConstraintLayout.java:482)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:1125)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
        at android.view.LayoutInflater.parseInclude(LayoutInflater.java:1263)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:1119)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:481)
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
        at com.whootis.hmmonitor.MainActivity.onCreate(MainActivity.java:51)
        at android.app.Activity.performCreate(Activity.java:7802)
        at android.app.Activity.performCreate(Activity.java:7791)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

布局/main_activity 是这样的：

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </com.google.android.material.appbar.AppBarLayout>

    <include layout="@layout/content_main" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

你可以清楚地看到第 23 行是这样的：

 <include layout="@layout/content_main" />

这基本上是 Android Studio 开箱即用的默认布局。我已经尝试添加它要求的 layout_width ，但它不会改变错误。然而，它在破坏布局的外观方面做得很好。

我完全被卡住了，我不知道如何解决这个问题。有人可以帮帮我吗？

标签： androidandroid-studio

Answer 1

还有另一行说，

    Binary XML file line #117: You must supply a layout_width attribute.

如果您还没有，请检查您的 content_main xml。检查是否有缺少 layout_width 的视图。