UninitializedPropertyAccessException:lateinit属性首选项尚未初始化 [英] UninitializedPropertyAccessException: lateinit property pref has not been initialized
问题描述
我知道已经在此处回答了类似的问题.但这是由于黄油刀库问题引起的,但我的情况有所不同.就我而言,当我在基本活动中使用注入匕首的属性时,会显示错误由以下原因引起:kotlin.UninitializedPropertyAccessException:lateinit属性首选项尚未初始化
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
但是当我在子活动(登录活动)中使用相同的属性时,它可以正常工作.
But the same property when I use in my sub activity (Login activity) it works fine.
例如 pref.setLanguage("abc")->在登录活动中工作正常,但在基本活动中抛出错误
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)
}
推荐答案
在初始化对象之前不能使用它.
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
按顺序接听电话.修复最简单的方法是将AndroidInjection.inject(this)
移到调用super.onCreate(...)
的位置.
Get your calls in order. Easiest way to fix would be to move AndroidInjection.inject(this)
before the call to super.onCreate(...)
.
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