data class Round(
    @ColumnInfo(name = "id")
    val id: Long,

    @ColumnInfo(name = "name")
    val name: String,

    @ColumnInfo(name = "description")
    val description: String,

    @ColumnInfo(name = "measurements_count")
    val measuredCount: Int
)

Entities and Pojos must have a usable public constructor. You can have an empty constructor or a constructor whose parameters match the fields (by name and type).

Tried the following constructors but they failed to match:
Round(long,java.lang.String,java.lang.String,int) : [arg0 : null, arg1 : null, arg2 : null, arg3 : null]

public class MyActivity extends AppCompatActivity {
    public void onCreate(Bundle savedInstanceState) {
        MyViewModel model = ViewModelProviders.of(this).get(MyViewModel.class);
        model.getUsers().observe(this, users -> {
            // update UI
        });
    }
}

conversionViewModel?.getConversion()?.observe(this, Observer<Conversion>{ conversion ->
            println("observer called with conversion: $conversion")
        })

Error:Execution failed for task ':app:transformClassesWithDexBuilderForDebug'.
> com.android.build.api.transform.TransformException: org.gradle.tooling.BuildException: com.android.dx.cf.code.SimException: local 0007: invalid

const

R

const val TEXT_RES = R.string.some_text

EquipmentLayer is not Comparable

sealed class Response
data class Success(val body : Data) : Response
data class Failure(val error : Throwable) : Response
...
if (res is Success) {
    updateUi(res.body)
}

?

dependencies {
        classpath ‘com.android.tools.build:gradle:2.3.2’
        classpath ‘org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.4-2’
        classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.4’
        classpath ‘io.fabric.tools:gradle:1.+’
        classpath ‘de.undercouch:gradle-download-task:2.1.0’
        classpath ‘me.tatarka:gradle-retrolambda:3.2.4’
        classpath ‘com.google.gms:google-services:3.0.0’
        classpath ‘com.github.triplet.gradle:play-publisher:1.2.0’
    }