App Background:
This is a simple kotlin MVVM app created in android studio that uses a room database to store the user's data locally that is not fully complete I'm currently trying to run the app just to make sure when the app is ran, the app functions correctly however, following stack trace appears when the home activity is started:
2023-01-09 20:34:34.298 18579-18579/com.example.fridgeit2 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.fridgeit2, PID: 18579
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fridgeit2/com.example.fridgeit2.ui.HomeActivity}: java.lang.RuntimeException: cannot find implementation for com.example.fridgeit2.data.ItemDatabase. ItemDatabase_Impl does not exist
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.lang.RuntimeException: cannot find implementation for com.example.fridgeit2.data.ItemDatabase. ItemDatabase_Impl does not exist
at androidx.room.Room.getGeneratedImplementation(Room.java:100)
at androidx.room.RoomDatabase$Builder.build(RoomDatabase.java:1486)
at com.example.fridgeit2.data.ItemDatabase$Companion.getInstance(ItemDatabase.kt:27)
at com.example.fridgeit2.ui.HomeActivity.onCreate(HomeActivity.kt:23)
at android.app.Activity.performCreate(Activity.java:7994)
at android.app.Activity.performCreate(Activity.java:7978)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Not sure why its saying that the ItemDataBase does not exist when it clearly does: https://imgur.com/a/BqZaD0a
ItemDatabase
package com.example.fridgeit2.data
import android.content.Context
import androidx.room.Database
import androidx.room.Room
import androidx.room.RoomDatabase
@Database(
entities = [Item::class],
version = 1
)
abstract class ItemDatabase : RoomDatabase() {
abstract val itemDAO : ItemDAO
companion object{
@Volatile
private var INSTANCE : ItemDatabase? = null
fun getInstance(context: Context):ItemDatabase{
synchronized(this){
var instance = INSTANCE
if(instance==null){
instance = Room.databaseBuilder(
context.applicationContext,
ItemDatabase::class.java,
"item_database"
).build()
INSTANCE = instance
}
return instance
}
}
}
}
Android Manifest File
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.fridgeit2">
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.FridgeIt2"
tools:targetApi="31">
<activity
android:name=".ui.HomeActivity"
android:label="Home"
android:exported="false" />
<activity
android:name=".ui.SplashScreenActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Build.gradle(Project) File
// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
id 'com.android.application' version '7.2.0' apply false
id 'com.android.library' version '7.2.0' apply false
id 'org.jetbrains.kotlin.android' version '1.7.10' apply false
}
task clean(type: Delete) {
delete rootProject.buildDir
}
Build.gradle(Module) File
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
}
apply plugin: "kotlin-kapt"
android {
compileSdk 32
defaultConfig {
applicationId "com.example.fridgeit2"
minSdk 21
targetSdk 32
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildFeatures{
viewBinding true
dataBinding true
}
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 {
//ROOM
def room_version = "2.4.3"
implementation "androidx.room:room-runtime:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version"
// Architectural Components
def lifecycle_version = "2.5.1"
implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
//Coroutines
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.1'
// Coroutine Lifecycle Scopes
implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1"
implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.5.1"
// Retrofit
implementation 'com.squareup.retrofit2:retrofit:2.6.0'
implementation 'com.squareup.retrofit2:converter-gson:2.6.0'
implementation "com.squareup.okhttp3:logging-interceptor:4.5.0"
// Navigation Components
implementation "androidx.navigation:navigation-fragment-ktx:2.5.3"
implementation "androidx.navigation:navigation-ui-ktx:2.5.3"
implementation 'androidx.core:core-ktx:1.8.0'
implementation 'androidx.appcompat:appcompat:1.5.1'
implementation 'com.google.android.material:material:1.7.0'
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'
}
Home Activity
package com.example.fridgeit2.ui
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import androidx.databinding.DataBindingUtil
import androidx.lifecycle.Observer
import com.example.fridgeit2.R
import com.example.fridgeit2.data.ItemDatabase
import com.example.fridgeit2.databinding.ActivityHomeBinding
import com.example.fridgeit2.repository.ItemRepository
class HomeActivity : AppCompatActivity() {
private lateinit var binding : ActivityHomeBinding
lateinit var itemViewModel: ItemViewModel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this,R.layout.activity_home)
val dao = ItemDatabase.getInstance(application).itemDAO
val repository = ItemRepository(dao)
val factory = ItemViewModelProviderFactory(repository)
//itemViewModel = ViewModelProvider(this,factory).get(ItemViewModelProviderFactory::class.java))
binding.itemViewModel = itemViewModel
binding.lifecycleOwner = this
displayItemList()
}
private fun displayItemList() {
itemViewModel.items.observe(this, Observer {
Log.i("MYTAG", it.toString())
})
}
}
Home Activity XML
<?xml version="1.0" encoding="utf-8"?>
<layout 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">
<data>
<variable
name="itemViewModel"
type="com.example.fridgeit2.ui.ItemViewModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.HomeActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@ id/rvItems"
android:layout_width="409dp"
android:layout_height="729dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
If you need anything else please let me know, thanks in advance!
CodePudding user response:
Use kapt instead of annotation processor . To use kapt , you need to add kapt plugin
apply plugin: 'kotlin-kapt'
CodePudding user response:
Update this
implementation "androidx.room:room-runtime:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version"
to
implementation "androidx.room:room-runtime:$room_version"
kapt "androidx.room:room-compiler:$room_version"