Develop Reference

ComposeView is very slow when opening the fragment for the first time

I added compose to an existing project.
I rewrote a fragment ui with compose, and when I'm starting the
fragment it takes a long time to start.
Adding a fragment from another fragment:
val fragment = FragmentWithComposeUi()
requireActivity().addFragment(fragment, R.id.fragment_container, "FragmentWithComposeUi")
addFragment() function to add the fragment.
fun FragmentActivity.addFragment(fragment: Fragment, container: Int, tag:String) {
val currentFragment = supportFragmentManager.findFragmentByTag(tag)
if (currentFragment == null) {
supportFragmentManager.beginTransaction()
.setReorderingAllowed(true)
.add(container, fragment, tag)
.addToBackStack(tag)
.commit()
}
}
FragmentWithComposeUi class :
class FragmentWithComposeUi: Fragment() {
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View {
return ComposeView(requireContext()).apply{
setContent {
//some ui
}
}
}
build.gradle
I tried using the new compose version 1.3.0-alpha01 either, it doesn't help.
buildscript {
ext {
compose_version = '1.1.1'
compose_compiler_version = '1.2.0'
}
repositories {
mavenCentral()
}
dependencies {
//
}
}
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 '1.7.0' apply false
}
task clean(type: Delete) {
delete rootProject.buildDir
}
build.gradle/app
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'kotlin-kapt'
}
android {
compileSdk 32
defaultConfig {
applicationId "com.e...."
minSdk 26
targetSdk 32
versionCode 1
versionName "1.0"
multiDexEnabled = true
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'
}
viewBinding {
enabled = true
}
packagingOptions {
resources {
excludes += '/META-INF/{AL2.0,LGPL2.1}'
}
resources.excludes.add("META-INF/*")
}
buildFeatures {
compose true
}
composeOptions {
kotlinCompilerExtensionVersion compose_compiler_version
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.6.0'
implementation 'androidx.appcompat:appcompat:1.3.1'
implementation 'com.google.android.material:material:1.5.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
implementation("androidx.multidex:multidex:2.0.1")
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.lifecycle:lifecycle-reactivestreams-ktx:2.5.0'
androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version"
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
//compose
implementation 'androidx.activity:activity-compose:1.3.1'
implementation "androidx.compose.ui:ui:$compose_version"
implementation "androidx.compose.material:material:$compose_version"
implementation "androidx.compose.ui:ui-tooling-preview:$compose_version"
implementation "androidx.compose.runtime:runtime-livedata:$compose_version"
...
}
Any reasons why it happens?
Thanks !

geting a java.lang.NullPointerException and i don't know where is the problem [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 9 months ago.
hey there i'm getting NullPointer Exception but I can't find where is the problem
my MainActivity.kt
class MainActivity : AppCompatActivity(), INotesRVAdapter {
lateinit var viewModel: NoteViewModel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setTheme(R.style.AppTheme)
setContentView(R.layout.activity_main)
supportActionBar!!.title = "My Tasks"
rvTask.layoutManager = LinearLayoutManager(this)
val adapter = NotesRVAdapter(this,this)
rvTask.adapter = adapter
viewModel = ViewModelProvider(this,ViewModelProvider.AndroidViewModelFactory.getInstance(application)).get(NoteViewModel::class.java)
viewModel.allTask.observe(this, Observer { list->
list?.let {
adapter.updateList(it)
}
})
}
override fun onItemClicked(note: Note) {
viewModel.deleteTask(note)
Toast.makeText(this , " ${note.text} Task Completed",Toast.LENGTH_SHORT).show()
}
fun submitData(view: View) {
val noteText = etTask.text.toString()
if (noteText.isNotEmpty()){
viewModel.insertTask(Note(noteText))
Toast.makeText(this , "$noteText Added",Toast.LENGTH_SHORT).show()
}
}
}
my build.gradle
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
android {
compileSdkVersion 32
defaultConfig {
applicationId "com.example.notesapp"
minSdkVersion 16
targetSdkVersion 30
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'
}
}
packagingOptions {
exclude 'META-INF/atomicfu.kotlin_module'
}
kotlinOptions {
jvmTarget = "1.8"
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
var roomVersion = "2.4.2"
implementation "androidx.appcompat:appcompat:$rootProject.appCompatVersion"
implementation "androidx.activity:activity-ktx:$rootProject.activityVersion"
// To use Kotlin annotation processing tool (kapt)
kapt("androidx.room:room-compiler:$roomVersion")
// Dependencies for working with Architecture components
// You'll probably have to update the version numbers in build.gradle (Project)
// Room components
implementation "androidx.room:room-ktx:$roomVersion"
kapt "androidx.room:room-compiler:$roomVersion"
androidTestImplementation "androidx.room:room-testing:$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"
// 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"
}

So after reading documentation i found that my room dependency needs to be upgraded and SDK also so after doing this app successfully instaled

implementation of cometchat sdk into kotlin project

I have been trying to implement comet Chat sdk into my project. I followed the documentation for kotlin but each time i try to initialize comet chat i get several errors. Here are my codes. 1. Main Activity
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
initCometChat()
}
private fun initCometChat() {
private val appID = "208314db190ca55b"
private val region = "us"
val appSettings = AppSettingsBuilder().subscribePresenceForAllUsers().setRegion(region).build()
CometChat.init(this, appID, appSettings, object : CallbackListener<String>() {
override fun onSuccess(successMessage: String) {
}
override fun onError(e: CometChatException) {
}
})
}
project level build gradle
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
}
The CometChat.init() function returns an error marked with red. I am new to kotlin and so i do not know how sdks work. Please help me. Thank you
app level build gradle
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
}
android {
compileSdk 31
defaultConfig {
applicationId "com.chat.comet"
minSdk 21
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'
}
}
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'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
implementation 'com.cometchat:pro-android-chat-sdk:3.0.4'
}

Dagger Hilt cannot create an instance of ViewModel having a constructor with arguments

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()
}

Android Studio project doesn't generate binding object for the Main Activity

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.