class FragmentActivity : AppCompatActivity() {
lateinit var binding : ActivityFragmentBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding= ActivityFragmentBinding.inflate(layoutInflater)
setContentView(binding.root)
binding.fragment1Button.setOnClickListener {
replaceFragment(BlankFragment2())
}
binding.fragment2Button.setOnClickListener {
replaceFragment(BlankFragment2())
}
}
private fun replaceFragment(fragment: Fragment) {
val fragmentManager = supportFragmentManager
val fragmentTransaction = fragmentManager.beginTransaction()
fragmentTransaction.replace(R.id.fragment_container_view,fragment)
fragmentTransaction.commit()
}
}
This is the Fragment activity.
<activity android:name=".fragments.FragmentActivity">
</activity>
Declaration in the manifest file.
fragmentActivityButton.setOnClickListener {
var intent = Intent(this@MainActivity, FragmentActivity::class.java)
startActivity(intent)
}
This is in the MainActivity.(startActivity(intent) is throwing the exception.)
<?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"
android:background="@drawable/button_shape"
tools:context=".MainActivity">
<Button
android:id="@+id/goToSecondButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/button_shape"
android:backgroundTint="@null"
android:text="Go to second Activity"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/childLinearLayout" />
<Button
android:id="@+id/recyclerViewButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/button_shape"
android:backgroundTint="@null"
android:text="go to recycler activity"
app:layout_constraintBottom_toTopOf="@+id/fragmentButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.5" />
<Button
android:id="@+id/fragmentButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/button_shape"
android:backgroundTint="@null"
android:text="go to fragment activity"
app:layout_constraintBottom_toTopOf="@+id/text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/recyclerViewButton"
app:layout_constraintVertical_bias="0.5" />
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:text="Have a good day!"
android:textAppearance="@style/TextAppearance.AppCompat.Display1"
android:textColor="@color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:id="@+id/childLinearLayout"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/text">
<Button
android:id="@+id/resetButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:baselineAligned="false"
android:text="reset"
app:layout_constraintStart_toStartOf="parent" />
<Button
android:id="@+id/changeButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:baselineAligned="false"
android:text="change"
app:layout_constraintEnd_toEndOf="parent" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
This is mainactivity xml.
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
}
android {
namespace 'com.example.greetingcard'
compileSdk 33
defaultConfig {
applicationId "com.example.greetingcard"
minSdk 24
targetSdk 33
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
buildFeatures{
viewBinding true
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.7.0'
implementation 'androidx.appcompat:appcompat:1.6.1'
implementation 'com.google.android.material:material:1.9.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.5'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
}
This is build.gradle file.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".fragments.FragmentActivity">
<androidx.fragment.app.FragmentContainerView
android:layout_width="match_parent"
android:layout_height="600dp"
android:id="@+id/fragment_container_view"
android:name="com.example.greetingcard.fragments.BlankFragment" />
<Button
android:layout_width="150dp"
android:layout_height="60dp"
android:id="@+id/fragment1_button"
android:backgroundTint="@color/black"
android:layout_alignParentBottom="true"
android:layout_marginBottom="50dp"
android:layout_marginStart="30dp"
android:text="Fragment 1"/>
<Button
android:layout_width="150dp"
android:layout_height="60dp"
android:id="@+id/fragment2_button"
android:backgroundTint="@color/black"
android:layout_alignParentBottom="true"
android:layout_marginBottom="50dp"
android:layout_marginEnd="30dp"
android:text="Fragment 1"/>
</RelativeLayout>
This is FragmentActivity xml.
Couldn't find the problem behind the exception. Thanks in advance.
App is crashing giving activity not found exception.
After many attempts i found the problem.
In your MainActivity you imported the uncorrect FragmentActivity, you named your second activity "FragmentActivity" but FragmentActivity is an Android default Activity of androidx library.
the solution is very easy: import correct activity!
from your MainActivity remove
import androidx.fragment.app.FragmentActivity
and add
import com.example.greetingcard.fragments.FragmentActivity