我知道这个问题已经回答[这里](lateinit property has not been initialized)。但这是由于黄油刀库问题但我的情况有所不同。完全不同。就我而言 当我在我的基本活动中使用匕首注入属性时,它显示错误引起:kotlin.UninitializedPropertyAccessException:lateinit属性pref尚未初始化
但是当我在我的子活动(登录活动)中使用它时,它的工作正常。
例如。 pref.setLanguage(" abc") - >它在登录活动中工作正常但在基本活动中引发错误
这是我的代码:
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)
}
构建器模块
@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)
}
答案 0 :(得分:16)
在初始化之前,不能使用对象。
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState) // prefs called in parents onCreate!
setContentView(R.layout.activity_login)
AndroidInjection.inject(this) // injection happens here
按顺序接听电话。最简单的解决方法是在调用AndroidInjection.inject(this)
之前移动super.onCreate(...)
。