UninitializedPropertyAccessException: lateinit property pref has not been initialized

Question

I know a similar question has been answered Here. But that was due to butter knife library problem but my case is different. In my case when I use dagger injected properties in my base activity it shows me error Caused by: kotlin.UninitializedPropertyAccessException: lateinit property pref has not been initialized

But the same property when I use in my sub activity (Login activity) it works fine.

eg. pref.setLanguage("abc") -> it works fine in login activity but throws error in base activity

Here is my code:

BaseActivity

    abstract class BaseActivity : AppCompatActivity() {     @Inject     lateinit var pref: AppSharedPreferences     @Inject     lateinit var utils: Utils     lateinit var mCurrentLanguage: String     protected lateinit var progressBarUtils: ProgressBarUtils      override fun onCreate(savedInstanceState: Bundle?) {         super.onCreate(savedInstanceState)         progressBarUtils = ProgressBarUtils(this)         mCurrentLanguage = "EN"         pref.setSelectedLanguage(mCurrentLanguage)        }     } 

LoginActivity

    class LoginActivity : BaseActivity() {     private val TAG = this.javaClass.name     lateinit var loginViewModel: LoginViewModel     @Inject     lateinit var viewModelFactory: LoginViewModelFactory       override fun onCreate(savedInstanceState: Bundle?) {         super.onCreate(savedInstanceState)         setContentView(R.layout.activity_login)         AndroidInjection.inject(this)         loginViewModel = ViewModelProviders.of(this, viewModelFactory).get(                 LoginViewModel::class.java)         loadData("abc", "xyz")         observerOnLoginResult()         observerOnLoginError()     }       private fun observerOnLoginError() {         loginViewModel.loginError().observe(this, Observer<String> {             progressBarUtils.cancelProgressDialog()             if (it != null) {                 Toast.makeText(this, resources.getString(R.string.error_message) + it,                         Toast.LENGTH_SHORT).show()             }         })     }      private fun observerOnLoginResult() {         loginViewModel.loginResult().observe(this,                 Observer<LoginModel> {                     progressBarUtils.cancelProgressDialog()                     if (it != null) {                         setData(it)                     }                 })     }      private fun setData(loginData: LoginModel) {         pref.setCurrentUserName(loginData.data.userName)     }      private fun loadData(email: String, password: String) {         progressBarUtils.showProgressDialog()         val builder = StringBuilder()         var auth = Base64.encodeToString(("$email:$password").toByteArray(), Base64.NO_WRAP)         builder.append("Basic ")         builder.append(auth)         loginViewModel.getLoginData(builder.toString())     }      override fun onDestroy() {         loginViewModel.disposeElements()         super.onDestroy()     } 

AppModule

    @Module class AppModule(val app: Application) {      @Provides     @Singleton     fun provideApplication(): Application = app       @Provides     @Singleton     fun provideSharedPreferences(): AppSharedPreferences = AppSharedPreferences(app)       @Provides     @Singleton     fun provideUtils(): Utils = Utils(app)     } 

Builder Module

    @Module abstract class BuildersModule {      @PerActivity     @ContributesAndroidInjector(modules = arrayOf(LoginModule::class))     abstract fun contributeLoginActivity(): LoginActivity      @PerActivity     abstract fun contributeBaseActivityActivity(): BaseActivity     } 

AppComponent

    @Singleton @Component(         modules = arrayOf(AndroidInjectionModule::class, AppModule::class, BuildersModule::class))      interface AppComponent {        fun inject(app: LotusApp)                 }  

Answer 1

You can't use an object before you initialize it.

override fun onCreate(savedInstanceState: Bundle?) {   super.onCreate(savedInstanceState) // prefs called in parents onCreate!   setContentView(R.layout.activity_login)   AndroidInjection.inject(this) // injection happens here 

Get your calls in order. Easiest way to fix would be to move AndroidInjection.inject(this) before the call to super.onCreate(...).