The errors are as follows. When I created the code and tried to make it work, I got the following error. R.id.container in Libraly's fragmentTransaction.replace(R.id.container, fragment) seems to be unavailable. I don't know why I can't get xml<fragment id = container. Tried it, changed AppCompatActivity to FragmentActivity/Fragment, etc. - didn't fix it.
Can you give me some solutions?
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.animalbook/com.example.animalbook.Libraly}: android.view.InflateException: Binary XML file line #58: Binary XML file line #58: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: android.view.InflateException: Binary XML file line #58: Binary XML file line #58: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #58: Error inflating class fragment
Caused by: java.lang.NullPointerException
package com.example.animalbook
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentActivity
import kotlinx.android.synthetic.main.activity_libraly.*
class Libraly : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_libraly)
lionButton.setOnClickListener {
val fragment = LioneFragment()
val fragmentManager = this.supportFragmentManager
val fragmentTransaction = fragmentManager.beginTransaction()
fragmentTransaction.replace(R.id.container, fragment).addToBackStack(null)
}
hippoButton.setOnClickListener {
val fragment = HippoFragment()
val fragmentManager = this.supportFragmentManager
val fragmentTransaction = fragmentManager.beginTransaction()
fragmentTransaction.replace(R.id.container, fragment).addToBackStack(null).commit()
}
giraffeButton.setOnClickListener {
val fragment = GiraffeFragment()
val fragmentManager = this.supportFragmentManager
val fragmentTransaction = fragmentManager.beginTransaction()
fragmentTransaction.replace(R.id.container,fragment).addToBackStack(null).commit()
}
val fragment = titlefragment as? TitleFragment
fragment?.setTitle("図鑑")
}
}
<?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=".Libraly">
<fragment
android:id="@+id/titlefragment"
android:name="com.example.animalbook.TitleFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout="@layout/fragment_title" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:layout_marginBottom="350dp"
android:orientation="horizontal"
android:id="@+id/Animalbutoon">
<Button
android:id="@+id/lionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/lione_text"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/hippoButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="24dp"
android:layout_marginRight="24dp"
android:text="@string/hippo_text"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/giraffeButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/giragge_text"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</LinearLayout>
<fragment
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="225dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
