I've been messing around with Jetpack Compose recently and I had gone through the basic tutorial here. Then I started looking at the Jetnewssample project they have. Now I'm ready to start working on my own project but now when I create a new project in the same parent directory as the Jetnewssample project, (which is working fine) Android Studio can no longer import androidx.ui.core.Text or androidx.ui.core.setContent. I can import other classes from the same location but now I just get an unresolved reference error. This is a new project set to start with an Empty Compose Activity. Here is the code:
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.Composable
import androidx.ui.core.Text
import androidx.ui.core.setContent
import androidx.ui.material.MaterialTheme
import androidx.ui.tooling.preview.Preview
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
MaterialTheme {
Greeting("Android")
}
}
}
}
#Composable
fun Greeting(name: String) {
Text(text = "Hello $name!")
}
#Preview
#Composable
fun DefaultPreview() {
MaterialTheme {
Greeting("Android")
}
}
Here's the module's gradle build file:
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 29
buildToolsVersion "29.0.2"
defaultConfig {
applicationId "com.franklin.sanctified"
minSdkVersion 21
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility = 1.8
targetCompatibility = 1.8
}
kotlinOptions {
jvmTarget = '1.8'
}
buildFeatures {
compose true
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.core:core-ktx:1.1.0'
implementation 'androidx.ui:ui-layout:0.1.0-dev03'
implementation 'androidx.ui:ui-material:0.1.0-dev03'
implementation 'androidx.ui:ui-tooling:0.1.0-dev03'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}
Update on :May-2021
Add below dependencies in app level Gradle or kts file for set content{ .. }
implementation("androidx.activity:activity-compose:1.3.0-alpha07")
Those seem to be in ui-framework for dev03. Try adding that dependency to your lineup:
implementation "androidx.ui:ui-framework:0.1.0-dev03"
In my case the problem was that I was missing activities integration for compose. setContent is an extension function on ComponentActivity class, defined in package androidx.activity.compose
Just import:
implementation 'androidx.activity:activity-compose:1.4.0'
Related
I'm making a new Empty Compose Activity from android studio and when I run the app it says Launch succeeded but the app crashes immediately after the android logo appears without any error messages.
Here's my gradle files:
Project build.gradle
buildscript {
ext {
compose_version = '1.2.0-alpha07'
}
}// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
id 'com.android.application' version '7.2.1' apply false
id 'com.android.library' version '7.2.1' apply false
id 'org.jetbrains.kotlin.android' version '1.6.10' apply false
}
task clean(type: Delete) {
delete rootProject.buildDir
}
Module build.gradle
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
}
android {
compileSdk 32
defaultConfig {
applicationId "com.example.myapplication"
minSdk 21
targetSdk 32
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 {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
buildFeatures {
viewBinding true
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.appcompat:appcompat:1.3.0'
implementation 'com.google.android.material:material:1.4.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation 'androidx.navigation:navigation-fragment-ktx:2.3.5'
implementation 'androidx.navigation:navigation-ui-ktx:2.3.5'
implementation "androidx.compose.ui:ui:$compose_version"
implementation "androidx.compose.material:material:$compose_version"
implementation "androidx.compose.ui:ui-tooling-preview:$compose_version"
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.activity:activity-compose:1.3.1'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version"
debugImplementation "androidx.compose.ui:ui-tooling:$compose_version"
debugImplementation "androidx.compose.ui:ui-test-manifest:$compose_version"
}
gradle-wrapper.properties
#Fri Feb 10 15:04:51 EET 2023
distributionBase=GRADLE_USER_HOME
distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
distributionPath=wrapper/dists
zipStorePath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
And the MainActivity.kt
package com.example.myapplicationcompose
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import com.example.myapplicationcompose.ui.theme.MyApplicationComposeTheme
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
MyApplicationComposeTheme {
// A surface container using the 'background' color from the theme
Surface(
modifier = Modifier.fillMaxSize(),
color = MaterialTheme.colors.background
) {
Greeting("Android")
}
}
}
}
}
#Composable
fun Greeting(name: String) {
Text(text = "Hello $name!")
}
#Preview(showBackground = true)
#Composable
fun DefaultPreview() {
MyApplicationComposeTheme {
Greeting("Android")
}
}
I tried running it on emulator and real device but both gave the same problem.
At first launch I got a composer error where the version was 1.1.0-beta01 so I changed it to 1.2.0-alpha07 and it worked.
I have a problem with Navigation jetpack compose, the problem is navigation doesn't work directly and shows an empty screen, but if I scroll in the empty screen or do a long click after that navigation starts working and shows the screen that I put inside the navigation.
I search a lot about this problem and I don't find any solution.
I try to change the version of the navigation compose and all the versions don't work.
and also when I use dark them work with out problme
except for version "2.4.0-alpha10" which works in some projects and doesn't in some projects
what is the problem? and why does this happen?
build . gradle (Medule:app)
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
}
android {
namespace 'com.example.myapplication'
compileSdk 33
defaultConfig {
applicationId "com.example.myapplication"
minSdk 24
targetSdk 33
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 {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
buildFeatures {
compose true
}
composeOptions {
kotlinCompilerExtensionVersion '1.3.2'
}
packagingOptions {
resources {
excludes += '/META-INF/{AL2.0,LGPL2.1}'
}
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.9.0'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.activity:activity-compose:1.5.1'
implementation platform('androidx.compose:compose-bom:2022.10.00')
implementation 'androidx.compose.ui:ui'
implementation 'androidx.compose.ui:ui-graphics'
implementation 'androidx.compose.ui:ui-tooling-preview'
implementation 'androidx.compose.material3:material3'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.5'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
androidTestImplementation platform('androidx.compose:compose-bom:2022.10.00')
androidTestImplementation 'androidx.compose.ui:ui-test-junit4'
debugImplementation 'androidx.compose.ui:ui-tooling'
debugImplementation 'androidx.compose.ui:ui-test-manifest'
def nav_version = "2.5.3"
implementation "androidx.navigation:navigation-compose:$nav_version"
}
build . gradle (project)
plugins {
id 'com.android.application' version '8.1.0-alpha02' apply false
id 'com.android.library' version '8.1.0-alpha02' apply false
id 'org.jetbrains.kotlin.android' version '1.7.20' apply false
}
Main Actvity
package com.example.myapplication
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController
import com.example.myapplication.ui.theme.MyApplicationTheme
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
MyApplicationTheme {
// A surface container using the 'background' color from the theme
Surface(
modifier = Modifier.fillMaxSize(),
color = MaterialTheme.colorScheme.background
) {
val navController = rememberNavController()
NavHost(navController = navController, startDestination = "younes") {
composable("younes") {
Text(text = "younes")
}
}
}
}
}
}
}
go to the Theme.file and change this line.
WindowCompat.getInsetsController(window, view).isAppearanceLightStatusBars = darkTheme
to
WindowCompat.getInsetsController(window, view).isAppearanceLightStatusBars = true
just change darkTheme to true
`I have an error on:
``
package com.example.movietime
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.example.movietime.databinding.ActivityRegisterBinding
import com.google.firebase.ktx.Firebase
class RegisterActivity : AppCompatActivity() {
DatabaseReference database = FirebaseDatabase.getInstance().getReference(); // also here with all sentence
// binding
private lateinit var binding: ActivityRegisterBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityRegisterBinding.inflate(layoutInflater)
setContentView(binding.root)
// move to login after click
binding.submitButton.setOnClickListener {
startActivity(Intent(this, LoginActiivty::class.java))
}
}
}
building grade(:app)
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'com.google.gms.google-services'
}
android {
namespace 'com.example.movietime'
compileSdk 33
defaultConfig {
applicationId "com.example.movietime"
minSdk 21
targetSdk 33
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildFeatures {
viewBinding 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 {
implementation 'com.google.firebase:firebase-database-ktx'
implementation 'androidx.core:core-ktx:1.9.0'
implementation 'androidx.appcompat:appcompat:1.5.1'
implementation 'com.google.android.material:material:1.7.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
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'
implementation platform('com.google.firebase:firebase-bom:31.0.2')
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}
build grade(project)
buildscript {
repositories {
// Check that you have the following line (if not, add it):
google() // Google's Maven repository
}
dependencies {
classpath 'com.android.tools.build:gradle:7.3.1'
classpath 'com.google.gms:google-services:4.3.14'
}
}
// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
id 'com.android.application' version '7.3.1' apply false
id 'com.android.library' version '7.3.1' apply false
id 'org.jetbrains.kotlin.android' version '1.7.20' apply false
}
``
`I'm kind of lost already,
tried this
Unresolved reference:database for Firebase Realtime database in my Kotlin program
but it didnt help either.
any suggestion will be welcome!
Unresolved reference:database for Firebase Realtime database in my Kotlin program
Reconnection the firebase to project and import from begging.`
I actually answered that question but in your case, the problem isn't related to the import but to the name of the class. So you're getting the following error:
Unsolved reference: Databaserefernce
Because there is no class that is called Databaserefernce but DatabaseReference. See the capital R? To solve this, please change the type of the variable to DatabaseReference, add the corresponding import and the error will go away.
Besides that, the way you're initializing the variable is not correct. That's how you do it in Java. In Kotlin you should do it like this:
val db = FirebaseDatabase.getInstance().reference
I am trying to call a suspend function using viewModelScope.launch in which "launch" is showing as Unresolved reference.
Here is build.gradle
plugins {
id 'com.android.application'
id 'kotlin-android'
id 'kotlin-kapt'
}
android {
compileSdk 31
defaultConfig {
applicationId "com.example.mynotes"
minSdk 27
targetSdk 31
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'
}
packagingOptions {
exclude 'META-INF/atomicfu.kotlin_module'
}
}
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)
// Room components
implementation "androidx.room:room-ktx:$rootProject.roomVersion"
kapt "androidx.room:room-compiler:$rootProject.roomVersion"
androidTestImplementation "androidx.room:room-testing:$rootProject.roomVersion"
// Lifecycle components
implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$rootProject.lifecycleVersion"
implementation "androidx.lifecycle:lifecycle-livedata-ktx:$rootProject.lifecycleVersion"
implementation "androidx.lifecycle:lifecycle-common-java8:$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:$rootProject.coroutines"
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.0'
// UI
implementation "androidx.constraintlayout:constraintlayout:$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:$rootProject.androidxJunitVersion"
}
and the ViewModel.kt
package com.example.mynotes
import android.app.Application
//import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.LiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.*
class NotesViewModel(application: Application) : ViewModel() {
private val repository : NotesRepository
val allNotes : LiveData<List<Notes>>
init {
val dao = NotesDatabase.getDatabase(application).getNotesDao()
repository = NotesRepository(dao)
allNotes = repository.allNotes
}
fun deleteNotes(notes: Notes) = viewModelScope.launch(Dispatchers.IO) {
repository.delete(notes)
}
}
In the function deleteNotes "viewModelScope.launch" is showing Unresolved reference: launch but there is no error while building the app but my app crash while running.
I think it's because of the way you are declaring the variable, since you are declaring it as a direct function, you can try the following:
fun deleteNotes(notes: Notes) {
viewModelScope.launch(Dispatchers.IO) {
repository.delete(notes)
}
}
It's possible the issue is related that when the method is declared and stored in memory, the scope hasnt been assigned yet.
Which version are you using?
implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.3.1"
Try to use this case is different.
Try to invalide cache and restart if still not recognized
I get a strange runtime exception when running some very simple code (8-line method; only 2 lines relevant) on my Android 10 device, after compiling with Android Studio Canary 7 (or 6) using Jetpack Compose alpha12.
Error:
java.lang.NoSuchMethodError: No static method copy-0d7_KjU$default(JFFFFILjava/lang/Object;)J in class Landroidx/compose/ui/graphics/Color; or its super classes (declaration of 'androidx.compose.ui.graphics.Color' appears in /data/app/com.example.myapplication-GbQdisqKhWdQawA6_DsPkQ==/base.apk)
at com.example.myapplication.MainActivity.onCreate(MainActivity.kt:15)
at android.app.Activity.performCreate(Activity.java:7955)
Code:
package com.example.myapplication
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.activity.compose.setContent
import androidx.compose.ui.graphics.Color
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val x = Color(0xFFBB86FC)
val y = x.copy() // ******* line 15 *******
setContent {
Surface(color = MaterialTheme.colors.background) {
Text(text = "hello world")
}
}
}
}
Top-level build.gradle:
buildscript {
ext {
compose_version = '1.0.0-alpha12'
}
repositories {
google()
jcenter()
}
dependencies {
classpath "com.android.tools.build:gradle:7.0.0-alpha07"
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.30-RC"
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
Module level build.gradle:
plugins {
id 'com.android.application'
id 'kotlin-android'
}
android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
applicationId "com.example.myapplication"
minSdkVersion 29
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'
useIR = true
freeCompilerArgs += [
"-P",
"plugin:androidx.compose.compiler.plugins.kotlin:suppressKotlinVersionCompatibilityCheck=true"
]
}
buildFeatures {
compose true
}
composeOptions {
kotlinCompilerExtensionVersion compose_version
}
}
dependencies {
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.activity:activity-compose:1.3.0-alpha02'
implementation "androidx.compose.ui:ui:$compose_version"
implementation "androidx.compose.ui:ui:$compose_version"
implementation "androidx.compose.material:material:$compose_version"
implementation "androidx.compose.ui:ui-tooling:$compose_version"
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.0'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
The culprit is the line classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.30-RC" which should instead be 1.4.30 without the -RC. The reason I had the initial -RC version was because the latest Android Studio Kotlin plugin version is indeed the -RC (frustrating that IntelliJ doesn't release the correct version even though it seems to be available in gradle), and using 1.4.30 gave a warning that it was different from the IDE version. Ignoring that warning and using the release version fixed that problem.
Sigh!