Unresolved reference: viewModelScope - Android KTX

Question

I'm trying to use the new viewModelScope() function provided by the new android ktx library.

In the gradle file, I've added:

implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.0.0'
implementation 'androidx.core:core-ktx:1.0.2'

but when I tied to access the viewModelScope(), I got Unresolved reference: viewModelScope error:

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

    fun fetchData(){
        viewModelScope.launch{

        }
    }
}

I don't understand what the problem is. Any idea? Thanks.

I am using lifecycle_version = "2.2.0". I am still getting the same error. Any solution for that? — Nithinjith, Apr 02 '20 at 07:01

score 6 · Accepted Answer · answered May 28 '19 at 17:28

6

Check the release notes https://developer.android.com/jetpack/androidx/releases/lifecycle#declaring_dependencies

viewModelScope is available from v2.1.x

So you need to bump your version in your gradle file.

answered May 28 '19 at 17:28

veritas1

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4

I am using lifecycle_version = "2.2.0", but the error is still persisting – Nithinjith Apr 02 '20 at 07:02
@Nithinjith make sure you have `import androidx.lifecycle.*` in your source. – ruds Jul 05 '20 at 14:34

score 2 · Answer 2 · answered Jun 26 '19 at 11:11

I have use in my project 2.1.0-beta01:

implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.1.0-beta01"

This is less version then released on official site.
However, I use it because new version 2.2.0-alpha01 still has the Unresolved reference: viewModelScope - Android KTX error.

Unresolved reference: viewModelScope - Android KTX

2 Answers2