JoseAlcerreca

class SimpleIdlingResource(private val resourceName: String) : IdlingResource {

    private val isIdle = AtomicBoolean(true)

    // written from main thread, read from any thread.
    @Volatile private var resourceCallback: IdlingResource.ResourceCallback? = null

    override fun getName(): String = resourceName

    override fun isIdleNow(): Boolean = isIdle.get()

JoseAlcerreca

// Expose resource IDs instead
public class MyViewModel extends ViewModel {
    public final MutableLiveData<Int> statusLabel = new MutableLiveData<>();
    
    public SampleViewModel() {
        ...
        statusLabel.setValue(R.string.labelString);
    }
}

JoseAlcerreca

// Don't do this
public class MyViewModel extends AndroidViewModel {
    public final MutableLiveData<String> statusLabel = new MutableLiveData<>();
    
    public SampleViewModel(Application context) {
        super(context);
        statusLabel.setValue(context.getString(R.string.labelString));
    }
}

JoseAlcerreca

val binding = DataBindingUtil.setContentView<TheGeneratedBinding>(
    this,
    R.layout.activity_data_binding
)

binding.lifecycleOwner = this // Use viewLifecycleOwner for fragments

binding.name = myLiveData // or myViewModel

JoseAlcerreca

val binding = DataBindingUtil.setContentView<TheGeneratedBinding>(
    this,
    R.layout.activity_data_binding
)

binding.name = myLiveData // or myViewModel

JoseAlcerreca

class MyViewModel : ViewModel() {
    private val _name = MutableLiveData<String>().apply { value = "Ada" }

    val name: LiveData<String> = _name // Expose the immutable version of the LiveData
}

JoseAlcerreca

class MyViewModel : ViewModel() {
    val name = ObservableField<String>("Ada")
}

JoseAlcerreca

<data>
        <import type="android.arch.lifecycle.LiveData" />
        <variable
            name="name"
            type="LiveData&lt;String>" />
</data>
…
<TextView
    android:text="@{name}"
    android:layout_width="wrap_content"

JoseAlcerreca

<data>
    <import type="android.databinding.ObservableField"/>
    <variable 
        name="name" 
        type="ObservableField&lt;String>" />
</data>
…
<TextView
    android:text="@{name}"
    android:layout_width="wrap_content"

JoseAlcerreca

fun getDataForUser(newUser: String?): LiveData<UserDataResult> {
   if (newUser == null) {
       return MutableLiveData<UserDataResult>().apply { value = null }
   }

   return userOnlineDataSource.getOnlineTime(newUser)
           .combineAndCompute(userCheckinsDataSource.getCheckins(newUser)) { a, b ->
       UserDataSuccess(a, b)
   }
}