问创建一个ViewModel会导致应用程序崩溃。(Kotlin/Android Studio)

EN

viewModel = ViewModelProvider(
    this, 
    ViewModelProvider.AndroidViewModelFactory.getInstance(application)
).get(NoteViewModel::class.java)

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id 'kotlin-kapt'
}

android {
    compileSdk 32

    defaultConfig {
        applicationId "com.example.notepractice"
        minSdk 26
        targetSdk 32
        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
    }
    packagingOptions {
        exclude 'META-INF/atomicfu.kotlin_module'
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
    buildFeatures {
        viewBinding true
    }
}

dependencies {
    implementation "androidx.appcompat:appcompat:$rootProject.appCompatVersion"
    implementation "androidx.activity:activity-ktx:$rootProject.activityVersion"

    // Dependencies for working with Architecture components
    // You'll probably have to update the version numbers in build.gradle (Project)

    implementation 'androidx.fragment:fragment-ktx:1.1.0'

    // Room components
    implementation "androidx.room:room-ktx:$rootProject.roomVersion"
    annotationProcessor "androidx.room:room-compiler:$rootProject.roomVersion"
    androidTestImplementation "androidx.room:room-testing:$rootProject.roomVersion"

    // Lifecycle components
    implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"
    implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.2.0"
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0"
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.2.0"
    implementation "androidx.lifecycle:lifecycle-common-java8:$rootProject.lifecycleVersion"

    // Kotlin components
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    api "org.jetbrains.kotlinx:kotlinx-coroutines-core:$rootProject.coroutines"
    api "org.jetbrains.kotlinx:kotlinx-coroutines-android:$rootProject.coroutines"

    // UI
    implementation "androidx.constraintlayout:constraintlayout:$rootProject.constraintLayoutVersion"
    implementation "com.google.android.material:material:$rootProject.materialVersion"

    // Testing
    testImplementation "junit:junit:$rootProject.junitVersion"
    androidTestImplementation "androidx.arch.core:core-testing:$rootProject.coreTestingVersion"
    androidTestImplementation ("androidx.test.espresso:espresso-core:$rootProject.espressoVersion", {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    androidTestImplementation "androidx.test.ext:junit:$rootProject.androidxJunitVersion"
}

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext.kotlin_version = "1.5.31"
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle-api:7.2.1"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

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
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}
/*
ext {
    activityVersion = '1.4.0'
    appCompatVersion = '1.4.0'
    constraintLayoutVersion = '2.1.2'
    coreTestingVersion = '2.1.0'
    coroutines = '1.5.2'
    lifecycleVersion = '2.4.0'
    materialVersion = '1.4.0'
    roomVersion = '2.3.0'
    // testing
    junitVersion = '4.13.2'
    espressoVersion = '3.4.0'
    androidxJunitVersion = '1.1.3'
}

 */
ext {
    activityVersion = '1.2.3'
    appCompatVersion = '1.3.0'
    constraintLayoutVersion = '2.0.4'
    coreTestingVersion = '2.1.0'
    coroutines = '1.5.0'
    lifecycleVersion = '2.3.1'
    materialVersion = '1.3.0'
    roomVersion = '2.3.0'
    // testing
    junitVersion = '4.13.2'
    espressoVersion = '3.1.0'
    androidxJunitVersion = '1.1.2'
}

package com.example.notepractice

import android.content.Intent
import android.os.Bundle
import android.widget.Toast
import androidx.activity.viewModels
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProvider
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.floatingactionbutton.FloatingActionButton
import java.util.*

class MainActivity : AppCompatActivity(), NoteClickInterface, NoteClickDeleteInterface {

    lateinit var viewModel: NoteViewModel
    lateinit var notesRV: RecyclerView
    lateinit var addFAB: FloatingActionButton

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        notesRV = findViewById(R.id.RVNotes)
        addFAB = findViewById(R.id.FABAddNote)

        notesRV.layoutManager = LinearLayoutManager(this)

        val noteRVAdapter = NoteRVAdapter(this, this, this)

        notesRV.adapter = noteRVAdapter

        viewModel = ViewModelProvider(
            this, 
            ViewModelProvider.AndroidViewModelFactory.getInstance(application)
        ).get(NoteViewModel::class.java)

        /*
        viewModel.allNotes.observe(this, Observer { list ->
            list?.let {
                noteRVAdapter.updateList(it)
            }
        })

        addFAB.setOnClickListener {
            val intent = Intent(this@MainActivity, AddEditNoteActivity::class.java)
            startActivity(intent)
            this.finish()
        }

         */
    }

    override fun onNoteClick(note: Note) {
        val intent = Intent(this@MainActivity, AddEditNoteActivity::class.java)

        intent.putExtra("noteType", "Edit")
        intent.putExtra("noteTitle", note.noteTitle)
        intent.putExtra("noteDescription", note.noteDescription)
        intent.putExtra("noteId", note.id)

        startActivity(intent)
    }

    override fun onDeleteIconClick(note: Note) {
        viewModel.deleteNote(note)
        Toast.makeText(this, "${note.noteTitle} Deleted", Toast.LENGTH_LONG).show()
    }
}

package com.example.notepractice

import android.app.Application
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.LiveData
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch

class NoteViewModel(application: Application): AndroidViewModel(application) {

    val allNotes: LiveData<List<Note>>
    val repository: NoteRepository

    init {
        val dao = NoteDatabase.getDatabase(application).getNotesDao()
        repository = NoteRepository(dao)
        allNotes = repository.allNotes
    }

    fun deleteNote (note: Note) = viewModelScope.launch(Dispatchers.IO) {
        repository.delete(note)
    }

    fun updateNote(note: Note) = viewModelScope.launch(Dispatchers.IO) {
        repository.update(note)
    }

    fun addNote(note: Note) = viewModelScope.launch(Dispatchers.IO) {
        repository.insert(note)
    }
}