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I am trying to understand ViewModel and LiveData concepts in android. I am making a practice project but when i added implementation 'androidx.lifecycle:lifecycle-extensions-ktx:2.0.0-alpha1' line in my app level gradle file it shows me

Failed to resolve: androidx.lifecycle:lifecycle-extensions-ktx:2.0.0-alpha1.

I have searched on google for solution and i found this answer, it works when i compile only viewmodel library but if i compile extensions library using same method as implementation group: 'androidx.lifecycle', name:'lifecycle-extensions-ktx', version: '2.0.0-alpha1' , it shows the same error as above. I have also tried to find it on Maven repositories site here but i didn't have any information for how to compile it.

UPDATE

App Level Build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "***************"
        minSdkVersion 19
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation group: 'androidx.lifecycle', name:'lifecycle-extensions-ktx', version: '2.0.0-alpha1'
    implementation group: 'androidx.lifecycle', name:'lifecycle-viewmodel-ktx', version: '2.0.0-alpha1'
As per @Dr.jacky's comment and Android Developers Documentation,
The APIs in lifecycle-extensions have been deprecated. Instead, add dependencies for the specific Lifecycle artifacts you need.
More Info at https://developer.android.com/jetpack/androidx/releases/lifecycle
I have found the answer. As Thunder Knight said here it seems to be that the repository was emptied somehow. Hence, you can not download it from the repository.. I agree with this and so i was looking for answer on mvnrepository.com and i found it here. I have to add
implementation group: 'androidx.lifecycle', name: 'lifecycle-extensions', version: '2.0.0-alpha1'
line for adding lifecycle-extensions and also i was adding -ktx in name of library but it was the mistake. In documentation they have not commented to add -ktx in line of lifecycle-extensions.
Credits:- @Thunder Knight
                The APIs in lifecycle-extensions have been deprecated. Instead, add dependencies for the specific Lifecycle artifacts you need. -> developer.android.com/jetpack/androidx/releases/lifecycle
– Dr.jacky
                Dec 4, 2020 at 21:28
The current version is 2.2.0
use -ktx for kotlin implementation
and kapt for annotationProcesssor
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
annotationProcessor 'androidx.lifecycle:lifecycle-compiler:2.2.0'
Check the developer site for more information
https://developer.android.com/topic/libraries/architecture/adding-components
Add these line
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.legacy:legacy-support-core-utils:1.0.0'
and comment these lines
// testImplementation 'junit:junit:4.13.2'
//androidTestImplementation 'androidx.test.ext:junit:1.1.2'
//androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
in my case i was trying to using room with LiveData. and all i did was remove the suspend key word from the query method.
Reference: post in forums.bignerdranch.com
Solution:
The APIs in lifecycle-extensions have been deprecated. Instead, add dependencies for the specific Lifecycle artifacts you need.
More details: developer.android.com
        
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