[Android] Error inflating class fragment

기존소스

<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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/app_bar_main">

    <fragment
        android:id="@+id/exercise_detail_fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent">

    </fragment>

</androidx.constraintlayout.widget.ConstraintLayout>

수정

• FragmentContainerView를 이용한다.

<androidx.fragment.app.FragmentContainerView
    android:id="@+id/fragmentContainerView"
    android:name="com.hu.myroutine.ExerciseDetailFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

참고

https://developer.android.com/reference/androidx/fragment/app/FragmentContainerView

로그

Process: com.hu.myroutine, PID: 28364
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hu.myroutine/com.hu.myroutine.MainActivity}: android.view.InflateException: Binary XML file line #15 in com.hu.myroutine:layout/activity_main: Binary XML file line #18 in com.hu.myroutine:layout/content_main: Error inflating class fragment
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4022)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4188)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2425)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:226)
        at android.os.Looper.loop(Looper.java:313)
        at android.app.ActivityThread.main(ActivityThread.java:8582)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:563)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1133)
     Caused by: android.view.InflateException: Binary XML file line #15 in com.hu.myroutine:layout/activity_main: Binary XML file line #18 in com.hu.myroutine:layout/content_main: Error inflating class fragment
     Caused by: android.view.InflateException: Binary XML file line #18 in com.hu.myroutine:layout/content_main: Error inflating class fragment
     Caused by: java.lang.NullPointerException
        at java.lang.VMClassLoader.findLoadedClass(Native Method)
        at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.app.Fragment.instantiate(Fragment.java:536)
        at android.app.FragmentContainer.instantiate(FragmentContainer.java:53)
        at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3553)
        at android.app.FragmentController.onCreateView(FragmentController.java:105)
        at android.app.Activity.onCreateView(Activity.java:7294)
        at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:300)
        at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1073)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1001)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:965)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:1127)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088)
        at android.view.LayoutInflater.parseInclude(LayoutInflater.java:1267)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088)
        at android.view.LayoutInflater.parseInclude(LayoutInflater.java:1267)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:686)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:538)
        at com.hu.myroutine.databinding.ActivityMainBinding.inflate(ActivityMainBinding.java:53)
        at com.hu.myroutine.databinding.ActivityMainBinding.inflate(ActivityMainBinding.java:47)
        at com.hu.myroutine.MainActivity.onCreate(MainActivity.kt:25)
        at android.app.Activity.performCreate(Activity.java:8282)
        at android.app.Activity.performCreate(Activity.java:8262)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1329)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3996)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4188)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
2021-11-21 12:53:24.388 28364-28364/? E/AndroidRuntime:     at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2425)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:226)
        at android.os.Looper.loop(Looper.java:313)
        at android.app.ActivityThread.main(ActivityThread.java:8582)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:563)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1133)
2021-11-21 12:53:24.401 28364-28364/? I/Process: Sending signal. PID: 28364 SIG: 9