android.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class androidx.fragment.app.FragmentContainerView

【问题标题】：android.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class androidx.fragment.app.FragmentContainerViewandroid.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class androidx.fragment.app.FragmentContainerView
【发布时间】：2021-01-24 19:26:23
【问题描述】：

我有一个非常令人沮丧的错误。该应用程序运行良好，直到昨天，我关闭了 android studio，然后当我今天打开它时显示此错误：

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.myapplication11, PID: 29530
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication11/com.example.myapplication.MainActivity}: android.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class androidx.fragment.app.FragmentContainerView
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2442)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2506)
        at android.app.ActivityThread.-wrap11(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5491)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
     Caused by: android.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class androidx.fragment.app.FragmentContainerView
        at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696)
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)
        at com.example.myapplication.MainActivity.onCreate(MainActivity.kt:19)
        at android.app.Activity.performCreate(Activity.java:6270)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2395)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2506) 
        at android.app.ActivityThread.-wrap11(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:5491) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
     Caused by: android.view.InflateException: Binary XML file line #22: Error inflating class androidx.fragment.app.FragmentContainerView
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:782)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696) 
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170) 
        at com.example.myapplication.MainActivity.onCreate(MainActivity.kt:19) 
        at android.app.Activity.performCreate(Activity.java:6270) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2395) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2506) 
        at android.app.ActivityThread.-wrap11(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:5491) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
     Caused by: java.lang.IllegalStateException: Fragment class was not set
        at androidx.navigation.fragment.FragmentNavigator$Destination.getClassName(FragmentNavigator.java:322)
        at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.java:158)
        at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.java:58)
        at androidx.navigation.NavGraphNavigator.navigate(NavGraphNavigator.java:71)
        at androidx.navigation.NavGraphNavigator.navigate(NavGraphNavigator.java:28)
        at androidx.navigation.NavController.navigate(NavController.java:1057)
        at androidx.navigation.NavController.onGraphCreated(NavController.java:637)
        at androidx.navigation.NavController.setGraph(NavController.java:590)
        at androidx.navigation.NavController.setGraph(NavController.java:555)
        at androidx.navigation.NavController.setGraph(NavController.java:537)
        at androidx.navigation.fragment.NavHostFragment.onCreate(NavHostFragment.java:248)
        at androidx.fragment.app.Fragment.performCreate(Fragment.java:2685)
        at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1187)
        at androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2236)
        at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2009)
        at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1965)
        at androidx.fragment.app.FragmentManager.execSingleAction(FragmentManager.java:1830)
        at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:303)
        at androidx.fragment.app.FragmentContainerView.<init>(Frag

弹出此错误的activity_main布局是：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:background="@color/design_default_color_primary"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light">

    </androidx.appcompat.widget.Toolbar>


// This is the line 22 in error

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/toolbar"
        app:navGraph="@navigation/nav_graph" >
    </androidx.fragment.app.FragmentContainerView>

</androidx.constraintlayout.widget.ConstraintLayout>

我想指出第三行有错误

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication11/com.example.myapplication.MainActivity}: android.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class androidx.fragment.app.FragmentContainerView

这部分“{com.example.myapplication11/com.example.myapplication.MainActivity}”。我不知道为什么它在这里显示 myapplication11 我的应用程序名称只是 myapplication ...我的 application11 是我正在从事的一个旧项目，所以它与此有关吗？ 我的 activitymain.kt 文件是

package com.example.myapplication

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import androidx.navigation.NavController
import androidx.navigation.fragment.NavHostFragment
import androidx.navigation.fragment.findNavController
import androidx.navigation.ui.onNavDestinationSelected
import androidx.navigation.ui.setupActionBarWithNavController
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() {
    private lateinit var navController: NavController
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val navHostFragment =
            supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
        navController = navHostFragment.findNavController()
        setSupportActionBar(toolbar)
        setupActionBarWithNavController(navController)
    }


    override fun onSupportNavigateUp(): Boolean {
        return navController.navigateUp() || super.onSupportNavigateUp()
    }
}

Gradle 构建 (MODULE) 文件是

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-android-extensions'
    id 'androidx.navigation.safeargs.kotlin'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.example.myapplication11"
        minSdkVersion 16
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
}

dependencies {
    implementation 'androidx.fragment:fragment-ktx:1.2.5'
    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.4.10"
    implementation 'androidx.core:core-ktx:1.3.2'
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.2.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    implementation 'androidx.navigation:navigation-fragment-ktx:2.3.2'
    implementation 'androidx.navigation:navigation-ui-ktx:2.3.2'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    testImplementation 'junit:junit:4.13.1'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

Gradle 构建文件（项目）：

buildscript {
    ext.kotlin_version = "1.3.72"
    ext.nav_version = "2.3.0"
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.1.1"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.10"
        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.3.2"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

【问题讨论】：

    标签： android xml android-studio kotlin inflate-exception


    【解决方案1】：

    所以，在你的 activity_main.xml 文件中..

    更改： android:name="androidx.navigation.fragment.NavHostFragment"

    收件人： class = "androidx.navigation.fragment.NavHostFragment"

    【讨论】：

    • 改成class还是没用
    • 如果你说的前几天没问题，那么请尝试关闭并重新打开 SDK
    • 所以我也尝试关闭并重新打开 SDK，它仍然给我同样的错误
    • 使用 FragmentManager 以编程方式实例化您的片段
    • 我不知道该怎么做。我不是编程背景，我是一名生物医学工程师，这是我最后一年的项目。很抱歉浪费了您的时间。
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