I took the Udacity course to learn developing Android apps with Kotlin, using data binding multiple times during it and having no problems enabling it, but now, trying to set up my first project, I am having some problems with it: Android Studio doesn't find the reference to the MainActivityBinding.
C:\Dev\Projects\Android_Studio\myproject\app\src\main\java\com\guglielmoboi\myproject\MainActivity.kt: (8, 35): Unresolved reference: MainActivityBinding
These are the files I produced:
build.gradle (project)
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext {
kotlin_version = "1.4.32"
}
repositories {
google()
jcenter()
}
dependencies {
classpath "com.android.tools.build:gradle:4.1.3"
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
build.gradle (:app)
plugins {
id 'com.android.application'
id 'kotlin-android'
id 'kotlin-kapt'
}
android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
applicationId "com.guglielmoboi.myproject"
minSdkVersion 26
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
**buildFeatures {
dataBinding true
viewBinding true
}**
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
/* Room dependencies */
def room_version = "2.3.0"
implementation "androidx.room:room-runtime:$room_version"
kapt "androidx.room:room-compiler:$room_version"
// optional - Kotlin Extensions and Coroutines support for Room
implementation "androidx.room:room-ktx:$room_version"
// optional - Test helpers
testImplementation "androidx.room:room-testing:$room_version"
/* Navigation dependencies */
def nav_version = "2.3.5"
// Java language implementation
implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
// Kotlin
implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
// Feature module Support
implementation "androidx.navigation:navigation-dynamic-features-fragment:$nav_version"
// Testing Navigation
androidTestImplementation "androidx.navigation:navigation-testing:$nav_version"
// Jetpack Compose Integration
implementation "androidx.navigation:navigation-compose:1.0.0-alpha10"
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.3.2'
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.3.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
activity_main.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>
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
MainActivity.kt
package com.guglielmoboi.myproject
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
class MainActivity : AppCompatActivity()
{
private lateinit var binding: MainActivityBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
}
Inside MainActivity
remove setContentView(R.layout.activity_main)
and add
val binding: ActivityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)
Use binding for all the UI stuff.
Related
I am trying to use Firebase Realtime database in Kotlin.
I have followed this tutorial but I think that something is wrong, because I get an error before compiling when I want to retrieve an instance of the database (Unresolved reference DataBasereference (or database if I uncomment the first line of the function tryToRead).
This is the code:
MainActivity.kt
package com.example.spesapp
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.google.firebase.ktx.Firebase
class MainActivity : AppCompatActivity() {
private lateinit var database: DataBasereference //Here I see "Unresolved reference"
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
fun tryToRead(){
//val database = Firebase.database
val myref = database.getReference
}
}
Gradle (module level)
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'com.google.gms.google-services'
}
android {
compileSdk 32
defaultConfig {
applicationId "com.example.frangelapp"
minSdk 21
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
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.7.0'
implementation 'androidx.appcompat:appcompat:1.4.1'
implementation 'com.google.android.material:material:1.5.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
implementation platform('com.google.firebase:firebase-bom:30.0.1')
implementation 'com.google.firebase:firebase-analytics-ktx'
implementation 'com.google.firebase:firebase-auth-ktx'
implementation 'com.google.firebase:firebase-firestore-ktx'
implementation 'com.google.firebase:firebase-firestore'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}
Gradle (Project level)
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
// Check that you have the following line (if not, add it):
google() // Google's Maven repository
}
dependencies {
// Add this line
classpath 'com.google.gms:google-services:4.3.10'
}
}
plugins {
id 'com.android.application' version '7.1.1' apply false
id 'com.android.library' version '7.1.1' apply false
id 'org.jetbrains.kotlin.android' version '1.6.10' apply false
}
task clean(type: Delete) {
delete rootProject.buildDir
}
I don't know what is the error. The tutorial seemed to be very easy, but I am facing with this problem.
Thanks in advance
You get the following error:
Unresolved reference DataBasereference
Because you have not added the Realtime Database dependency in your project. To solve this, simply add:
implementation 'com.google.firebase:firebase-database-ktx'
Inside your build.gradle file.
After going through documentations and trying solutions of similar questions here on stackoverflow, nothing seems to fix the issue.
I tried altering all related dependencies, trying additional dependencies and tweaking the versions. Gradle builds successfully but there is a runtime error that through trial and error, the only method I found that could fix it was removing the argument from the ViewModel which is not desirable for me as the same setup used to work in my older projects.
RuntimeException
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example, PID: 17527
java.lang.RuntimeException: Cannot create an instance of class com.example.ui.MainViewModel
at androidx.lifecycle.ViewModelProvider$NewInstanceFactory.create(ViewModelProvider.kt:188)
build.gradle(:app)
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'kotlin-kapt'
id 'dagger.hilt.android.plugin'
id 'com.google.devtools.ksp' version '1.6.10-1.0.2'
}
kotlin {
sourceSets {
debug {
kotlin.srcDir("build/generated/ksp/debug/kotlin")
}
release {
kotlin.srcDir("build/generated/ksp/release/kotlin")
}
}
}
android {
compileSdk 31
defaultConfig {
multiDexEnabled = true
applicationId "com.example"
minSdk 23
targetSdk 31
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
vectorDrawables {
useSupportLibrary true
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
coreLibraryDesugaringEnabled true
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
freeCompilerArgs += '-Xopt-in=kotlin.RequiresOptIn'
}
buildFeatures {
compose true
}
composeOptions {
kotlinCompilerExtensionVersion compose_version
}
packagingOptions {
resources {
excludes += '/META-INF/{AL2.0,LGPL2.1}'
}
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.7.0'
implementation "androidx.compose.ui:ui:$compose_version"
implementation 'androidx.compose.material3:material3:1.0.0-alpha04'
implementation "androidx.compose.ui:ui-tooling-preview:$compose_version"
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.4.0'
implementation 'androidx.activity:activity-compose:1.4.0'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version"
debugImplementation "androidx.compose.ui:ui-tooling:$compose_version"
debugImplementation "androidx.compose.ui:ui-test-manifest:$compose_version"
//lifecycle
implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.0"
implementation "androidx.lifecycle:lifecycle-viewmodel-compose:2.4.0"
//Hilt
implementation "com.google.dagger:hilt-android:$hilt_version"
kapt "com.google.dagger:hilt-compiler:$hilt_version"
implementation "androidx.hilt:hilt-lifecycle-viewmodel:1.0.0-alpha03"
kapt "androidx.hilt:hilt-compiler:1.0.0"
//Coroutines
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.0'
//DataStore
implementation "androidx.datastore:datastore-preferences:1.0.0"
//Desugaring
coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'
//Compose Destinations
implementation "io.github.raamcosta.compose-destinations:core:1.2.1-beta"
ksp "io.github.raamcosta.compose-destinations:ksp:1.2.1-beta"
build.gradle(Project)
buildscript {
ext {
compose_version = '1.2.0-alpha02'
hilt_version = "2.40.5"
}
dependencies {
classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_version"
}
}// 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-beta01' apply false
id 'com.android.library' version '7.2.0-beta01' apply false
id 'org.jetbrains.kotlin.android' version '1.6.10' apply false
id 'org.jetbrains.kotlin.jvm' version '1.6.10' apply false
}
task clean(type: Delete) {
delete rootProject.buildDir
}
MainViewModel.kt
#HiltViewModel
class MainViewModel #Inject constructor(
private val dataStoreRepository: DataStoreRepository
) : ViewModel() {...}
MainActivity.kt
#AndroidEntryPoint
class MainActivity : ComponentActivity() {
private val mainViewModel: MainViewModel by viewModels()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
DestinationsNavHost(navGraph = NavGraphs.root)
}
}
}
Did you create module class? like below:
#Module
#InstallIn(SingletonComponent::class)
class RepositoryModule {
#Provides
#Singleton
fun provideDataStoreRepository(): DataStoreRepository = DataStoreRepository()
}
I am trying to Add Navigation in my project but its showing failed to add Navigation dependency,
when i click on 'ok' in the window to add these now , its showing failed to add dependency and my navigation xml editor is not visible
here are some screen shots
my build.gradle (app) :-
plugins {
id 'com.android.application'
id 'kotlin-android'
id 'com.google.gms.google-services'
id 'kotlin-android-extensions'
}
android {
compileSdkVersion 31
buildToolsVersion "30.0.3"
defaultConfig {
applicationId "com.choudhary.myshop"
minSdkVersion 21
targetSdkVersion 31
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
androidExtensions {
experimental = 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'
}
buildFeatures{
viewBinding = true
}
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.7.0'
implementation 'androidx.appcompat:appcompat:1.4.1'
implementation 'com.google.android.material:material:1.5.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
implementation 'com.google.firebase:firebase-auth-ktx:21.0.1'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.navigation:navigation-fragment-ktx:2.4.0'
implementation 'androidx.navigation:navigation-ui-ktx:2.4.0'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
implementation platform('com.google.firebase:firebase-bom:29.0.4')
implementation 'com.google.firebase:firebase-analytics-ktx'
implementation platform('com.google.firebase:firebase-bom:29.0.0')
implementation 'com.google.firebase:firebase-firestore'
implementation 'com.github.bumptech.glide:glide:4.12.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.12.0'
implementation 'com.google.firebase:firebase-storage-ktx'
def lifecycle_version = "2.5.0-alpha01"
def arch_version = "2.1.0"
// ViewModel
implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version")
// ViewModel utilities for Compose
implementation("androidx.lifecycle:lifecycle-viewmodel-compose:$lifecycle_version")
// LiveData
implementation("androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version")
def nav_version = "2.4.0"
// Kotlin
implementation("androidx.navigation:navigation-fragment-ktx:$nav_version")
implementation("androidx.navigation:navigation-ui-ktx:$nav_version")
// Feature module Support
implementation("androidx.navigation:navigation-dynamic-features-fragment:$nav_version")
// Testing Navigation
androidTestImplementation("androidx.navigation:navigation-testing:$nav_version")
// Jetpack Compose Integration
implementation("androidx.navigation:navigation-compose:2.5.0-alpha01")
}
my build.gradle (project ) :-
buildscript {
ext.kotlin_version = "1.4.32"
repositories {
google()
jcenter()
}
dependencies {
classpath "com.android.tools.build:gradle:4.1.3"
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath 'com.google.gms:google-services:4.3.10'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
mavenCentral()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
Seems like Navigation with version 2.3.6 - 2.4.* shows that problem
You can change only
implementation 'androidx.navigation:navigation-fragment-ktx:2.4.0'
implementation 'androidx.navigation:navigation-ui-ktx:2.4.0'
to
implementation 'androidx.navigation:navigation-fragment-ktx:2.3.5'
implementation 'androidx.navigation:navigation-ui-ktx:2.3.5'
delete all navigation dependency related , and add this :
implementation 'androidx.navigation:navigation-fragment-ktx:2.3.5'
implementation 'androidx.navigation:navigation-ui-ktx:2.3.5'
Add 2.3.4 instead of 2.3.5/2.5.3
It's working...
I was trying to explore Hilt with simplest possible example, but my application isn't building. I added all the dependencies but when I try to build, it shows an error indicating not finding the hilt gradle plugin.
Here are my codes:
build.gradle(project)
ext.kotlin_version = "1.5.20"
ext.hilt_version = '2.35'
repositories {
google()
mavenCentral()
}
dependencies {
classpath "com.android.tools.build:gradle:4.2.1"
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_version"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
mavenCentral()
jcenter() // Warning: this repository is going to shut down soon
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
build.gradle(app)
plugins{
id 'com.android.application'
id 'kotlin-android'
id 'kotlin-kapt'
id 'dagger.hilt.android.plugin'
}
android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
applicationId "com.bonny.tutorial.hilttest"
minSdkVersion 23
targetSdkVersion 30
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
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.5.0'
implementation 'androidx.appcompat:appcompat:1.3.0'
implementation 'com.google.android.material:material:1.3.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
testImplementation 'junit:junit:4.+'
//hilt
implementation "com.google.dagger:hilt-android:$hilt_version"
kapt "com.google.dagger:hilt-android-compiler:$hilt_version"
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
Application Class (included in the Manifest too)
import android.app.Application
import dagger.hilt.android.HiltAndroidApp
#HiltAndroidApp
class TextApplication : Application() {
}
Dependency class (MyTexts.kt)
class MyTexts #Inject constructor(){
val text = "Hello World"
}
MainActivity.kt
#AndroidEntryPoint
class MainActivity : AppCompatActivity() {
private lateinit var tv: TextView
#Inject lateinit var myTexts: MyTexts
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
tv = findViewById(R.id.myText)
tv.text = myTexts.text
}
}
and the error looks like this:
public final class MainActivity extends androidx.appcompat.app.AppCompatActivity {
^
Expected #AndroidEntryPoint to have a value. Did you forget to apply the Gradle Plugin? (dagger.hilt.android.plugin)
See https://dagger.dev/hilt/gradle-setup.html
[Hilt] Processing did not complete. See error above for details.
Please suggest.
Kotlin 1.5.20 just came out (24 jun 2021) so there seems to be some compatibility issue. You can bring down to ext.kotlin_version = "1.5.10" in your build.gradle(project)
Also, Update hilt to latest 2.37
project build
classpath "com.google.dagger:hilt-android-gradle-plugin:2.37"
app build:
//Dagger - Hilt
implementation "com.google.dagger:hilt-android:2.37"
kapt "com.google.dagger:hilt-android-compiler:2.37"
I am getting 'Unresolved reference: requireLensFacing' for CameraSelector.Builder.requireLensFacing(lensFacing).build()
I have added camera core dependencies and I can actually open up the CameraSelector class and find the 'requireLensFacing' method inside it. But I just can't use it.
Here is my app gradle:
plugins {
id 'com.android.application'
id 'kotlin-android'
id 'kotlin-kapt'
id 'kotlin-android-extensions'
}
android {
compileSdkVersion 30
buildToolsVersion "30.0.2"
defaultConfig {
applicationId "com.devtyagi.facemaskdetector"
minSdkVersion 21
targetSdkVersion 30
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
}
kotlinOptions {
jvmTarget = '1.8'
}
buildFeatures{
mlModelBinding true
}
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.3.2'
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.2.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.2.0"
implementation 'com.google.android.material:material:1.2.1'
implementation "androidx.camera:camera-core:${camerax_version}"
implementation "androidx.camera:camera-camera2:${camerax_version}"
implementation "androidx.camera:camera-lifecycle:${camerax_version}"
implementation "androidx.camera:camera-view:1.0.0-alpha20"
implementation "androidx.camera:camera-extensions:1.0.0-alpha20"
implementation "org.tensorflow:tensorflow-lite-metadata:${tflite}"
implementation "org.tensorflow:tensorflow-lite-gpu:2.2.0"
implementation 'org.tensorflow:tensorflow-lite-support:0.1.0-rc1'
testImplementation 'junit:junit:4.13.1'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
And here is my Project Level gradle file:
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext.kotlin_version = "1.4.21"
ext.tflite = "0.1.0-rc1"
ext.camerax_version = "1.0.0-rc01"
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:4.1.1'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
Here is the error:
Screenshot
How do I resolve this issue?
Thank You
You should use it like this val cameraSelector = CameraSelector.Builder().requireLensFacing(lensFacing).build()
you are using Builder replace it with Builder()