MVVM on Android
Notes: 08. Save Data to the Repository
The saveCreature() method’s code in the view model has been updated in the final project in the download materials.
It lauches a new coroutine without blocking the current thread.
It looks like this now:
fun saveCreature() = viewModelScope.launch {
repository.saveCreature(creature)
}
The conditional check is now done in the click listener of the the save button. Check out the final project to see the changes.
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In this video, we’ll save new creatures into the repository we previously setup. We don’t want the user to be able to save creatures with blank attributes, for example, a blank name. Let’s write a view model test to make sure that creatures with blank names can’t be saved.
@Test
fun testCantSaveCreatureWithBlankName() {
creatureViewModel.intelligence = 10
creatureViewModel.strength = 3
creatureViewModel.endurance = 7
creatureViewModel.drawable = 1
creatureViewModel.name = ""
val canSaveCreature = creatureViewModel.canSaveCreature()
assertEquals(false, canSaveCreature)
}
private val repository: CreatureRepository = RoomRepository()
@Mock
lateinit var repository: CreatureRepository
creatureViewModel = CreatureViewModel(mockGenerator, repository)
fun canSaveCreature(): Boolean {
return intelligence != 0 && strength != 0 && endurance != 0 &&
name.isNotEmpty() && drawable != 0
}
fun saveCreature(): Boolean {
return if (canSaveCreature()) {
repository.saveCreature(creature)
true
} else {
false
}
}
if (viewModel.saveCreature()) {
Toast.makeText(this, getString(R.string.creature_saved), Toast.LENGTH_SHORT).show()
finish()
} else {
Toast.makeText(this, getString(R.string.error_saving_creature), Toast.LENGTH_SHORT).show()
}