ViewModel initialization

BaseModel.kt

abstract class BaseModel: ViewModel() {
    
    var initialized: Boolean = false
        private set

    /**
     * Called from activity's onCreate or onStart
     */
    fun initialize() {
        if (!initialized) {
            doInitialize()
            initialized = true
        }
    }

    /**
     * Internal initialization (if needed)
     */
    protected open fun doInitialize() { }
}