我正在使用 android Architecture Component LiveData 使用 Observable LiveData 通知 UI，但它没有被触发。下面是代码片段。
授权库
class AuthRepository(private val repository:Avails) {
fun auth(mobile: String): LiveData<Boolean>{
var data: MutableLiveData<Boolean> = MutableLiveData()
repository.auth(prepareHeaders(), AuthRequest(mobile))
.enqueue(object : Callback<AuthResponse>{
override fun onResponse(call: Call<AuthResponse>, response: Response<AuthResponse>) {
if(response.isSuccessful){
data.value = true
}
}
override fun onFailure(call: Call<AuthResponse>, t: Throwable) {
data.value = false
}
})
return data
}
}
登录视图模型
class LoginViewModel(private val repository: AuthRepository) : ViewModel() {
var _showOtpScreen: MutableLiveData<Boolean> = MutableLiveData()
fun auth(mobile: String){
_showOtpScreen.value = repository.auth(mobile).value
}
}
登录片段
class LoginFragment : Fragment() {
private lateinit var loginViewModel: LoginViewModel
companion object {
private const val sTag: String = "LoginFragment"
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
val authRepository = AuthRepository(AvailsClient.retrofit.create(Avails::class.java))
loginViewModel = ViewModelProviders.of(this,LoginViewModelFactory(authRepository)).get(LoginViewModel::class.java)
loginViewModel._showOtpScreen.observe(this, Observer {
if(it != null){
if(it){
Log.e(sTag,"OTP RECEIVED")
findNavController().navigate(R.id.action_loginFragment_to_verifyOtpFragment)
}else{
Log.e(sTag,"Failed to get OTP")
}
}
})
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_login, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
btnContinue.setOnClickListener {
loginViewModel.auth(edtPhoneNumber.text.toString())
}
}
}
上面的代码无法观察 _showOtpScreen 它只被调用一次，值为空，并且在服务调用完成后不再被调用。