catalinghita8

class LocalDataSource() {
    private val jsonFile = resources.getFile(JSON_FILE_TAG)
  
    fun getCachedData() = jsonFile.toString()
}

class DataViewModel() {
    private val localDataClient = LocalDataSource()
  
    fun getData() = localDataClient.getCachedData()

catalinghita8

class DataViewModelTest {
    lateinit var dataViewModel: DataViewModel
    
    @Before
    fun setup() {
        dataViewModel = DataViewModel(RemoteDataSource()) // This will fail!
    } 
}

catalinghita8

class LocalDataFragment: Fragment() {
    fun initializeViewModel() {
        val injectedDataClient: DataSource = DependencyInjector.localDataClient
        val viewModel = DataViewModel(injectedDataClient)
        viewModel.getCachedData()
    }
}

class RemoteDataFragment: Fragment() {
    fun initializeViewModel() {

catalinghita8

interface DataSource {
    fun getData(): String
}

class LocalDataClient: DataSource {
    override fun getData() = sharedPreferences.getString(KEY)
}

class RemoteDataClient: DataSource {
    override fun getData() = retrofit.getValue(KEY)

catalinghita8

// Container of objects shared across the whole project
class DependencyInjector {
    private val objectA: A = A()
    private val objectB: B = B()
    val repository: Repository = Repository(objectA, objectB)
}

fun main {
    val injectedRepository = DependencyInjector.repository
    val vm = ViewModel(injectedRepository)

catalinghita8

class ViewModel {
    private val repository: Repository  = Repository (A(), B())

    fun doSomething() {
        repository.use()
    }
}

class Repository(private val objectA: A, private val objectB: B) {
    fun use() {

catalinghita8

class ViewModel(private val repository: Repository) {
    fun doSomething() {
        repository.use()
    }
}

class Repository(private val objectA, private val objectB: B) {
    fun use() {
        objectA.use()
        objectB.use()

catalinghita8

class ViewModel {
    private val repository: Repository = Repository()
  
    fun doSomething() {
        repository.use()
    }
}

class Repository {
    private val objectA: A = A()

catalinghita8

@Provides
@ActivityScoped
String provideActivityId(RegistrationActivity activity) {
    return activity.getIntent().getStringExtra(ID);
}

catalinghita8

dependencies {
      ...
      
    implementation group: 'edu.stanford.nlp', name: 'stanford-corenlp', version: '3.5.0'
    implementation group: 'edu.stanford.nlp', name: 'stanford-corenlp', version: '3.5.0', classifier: 'models'
}