Varsha Myadam
Reputation: 11
java.lang.Class has no zero argument constructor and Cannot create an instance of ViewModel
When I'm visiting the application and once accessing this fragment(MenstrualFragment), the application crashes and this is displayed in the Logcat -
2022-06-23 15:44:59.110 11278-11278/com.miniproject.monthlies E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.miniproject.monthlies, PID: 11278
java.lang.RuntimeException: Cannot create an instance of class com.miniproject.monthlies.ui.fragments.menstruation.menstrual.MenstrualViewModel
at androidx.lifecycle.ViewModelProvider$NewInstanceFactory.create(ViewModelProvider.kt:188)
at androidx.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.kt:238)
at androidx.lifecycle.SavedStateViewModelFactory.create(SavedStateViewModelFactory.java:112)
at androidx.lifecycle.SavedStateViewModelFactory.create(SavedStateViewModelFactory.java:146)
at dagger.hilt.android.internal.lifecycle.HiltViewModelFactory.create(HiltViewModelFactory.java:111)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.kt:171)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.kt:139)
at androidx.lifecycle.ViewModelLazy.getValue(ViewModelLazy.kt:44)
at androidx.lifecycle.ViewModelLazy.getValue(ViewModelLazy.kt:31)
at com.miniproject.monthlies.ui.fragments.MenstrualFragment.getMViewModel(MenstrualFragment.kt:52)
at com.miniproject.monthlies.ui.fragments.MenstrualFragment.observeViewModel(MenstrualFragment.kt:127)
at com.miniproject.monthlies.ui.fragments.MenstrualFragment.onCreateView(MenstrualFragment.kt:72)
at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2963)
at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:518)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:282)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2189)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2106)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:2002)
at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:524)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:255)
at android.app.ActivityThread.main(ActivityThread.java:8212)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:632)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)
Caused by: java.lang.InstantiationException: java.lang.Class<com.miniproject.monthlies.ui.fragments.menstruation.menstrual.MenstrualViewModel> has no zero argument constructor
at java.lang.Class.newInstance(Native Method)
at androidx.lifecycle.ViewModelProvider$NewInstanceFactory.create(ViewModelProvider.kt:186)
at androidx.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.kt:238)
at androidx.lifecycle.SavedStateViewModelFactory.create(SavedStateViewModelFactory.java:112)
at androidx.lifecycle.SavedStateViewModelFactory.create(SavedStateViewModelFactory.java:146)
at dagger.hilt.android.internal.lifecycle.HiltViewModelFactory.create(HiltViewModelFactory.java:111)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.kt:171)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.kt:139)
at androidx.lifecycle.ViewModelLazy.getValue(ViewModelLazy.kt:44)
at androidx.lifecycle.ViewModelLazy.getValue(ViewModelLazy.kt:31)
at com.miniproject.monthlies.ui.fragments.MenstrualFragment.getMViewModel(MenstrualFragment.kt:52)
at com.miniproject.monthlies.ui.fragments.MenstrualFragment.observeViewModel(MenstrualFragment.kt:127)
at com.miniproject.monthlies.ui.fragments.MenstrualFragment.onCreateView(MenstrualFragment.kt:72)
at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2963)
at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:518)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:282)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2189)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2106)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:2002)
at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:524)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:255)
at android.app.ActivityThread.main(ActivityThread.java:8212)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:632)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)
MenstrualViewModel-
package com.miniproject.monthlies.ui.fragments.menstruation.menstrual
import android.content.Context
import androidx.lifecycle.MutableLiveData
import com.miniproject.monthlies.feature.mapper.MenstrualPeriodResumeMapper
import com.google.firebase.firestore.ktx.toObject
import com.miniproject.monthlies.data.firebase.FirebaseUtil
import com.miniproject.monthlies.data.model.menstrual.MenstrualPeriodMonthly
import com.miniproject.monthlies.data.model.menstrual.MenstrualPeriodResume
import com.miniproject.monthlies.data.remote.RemoteRepository
import com.miniproject.monthlies.feature.model.menstrual.MenstrualPeriodMonthlyIntent
import com.miniproject.monthlies.feature.model.menstrual.MenstrualPeriodResumeIntent
import com.miniproject.monthlies.ui.activities.base.BaseFirebaseListener
import com.miniproject.monthlies.ui.activities.base.BaseViewModel
import com.miniproject.monthlies.util.Const
import dagger.hilt.android.lifecycle.HiltViewModel
import dagger.hilt.android.qualifiers.ApplicationContext
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import java.text.SimpleDateFormat
import java.util.*
import javax.inject.Inject
//@HiltViewModel
class MenstrualViewModel @Inject constructor(
val firebaseUtil: FirebaseUtil,
private val repository: RemoteRepository,
) : BaseViewModel() {
//private val sharePreferenceUtil: SharePreferenceUtil,
//@ApplicationContext private val application: Context
//class MenstrualViewModel(private val repository: Repository): ViewModel() {
private val menstrualPeriodResumeMapper = MenstrualPeriodResumeMapper.getInstance()
var activeYear = ""
var activeYearData: MenstrualPeriodMonthlyIntent? = null
var maxCycleLong = 0
var minCycleLong = 0
var periodLong = 0
var activeMonth = 0
val progressGetMenstrualRecord = MutableLiveData<Boolean>()
val successGetMenstrualRecord = MutableLiveData<MenstrualPeriodMonthlyIntent>()
val errorGetMenstrualRecord = MutableLiveData<String>()
fun getMenstrualPeriod(year: String){
CoroutineScope(Dispatchers.IO).launch {
try {
progressGetMenstrualRecord.postValue(true)
val user = firebaseUtil.firebaseAuth.currentUser
activeYear = year
periodLong = 0
activeMonth = 0
firebaseUtil.fireStoreDb
.collection(Const.COLLECTION_MENSTRUAL_PERIOD)
.document(user?.uid?:"")
.collection(activeYear)
.get()
.addOnSuccessListener {result ->
val menstrualPeriodMonthly = MenstrualPeriodMonthlyIntent()
if (!result.isEmpty){
for (querySnapshot in result){
val data = querySnapshot?.toObject<MenstrualPeriodResumeIntent>()
if (data != null){
if (maxCycleLong == 0 && minCycleLong == 0){
maxCycleLong = data.longCycle
minCycleLong = data.longCycle
}
if (data.longCycle > maxCycleLong){
maxCycleLong = data.longCycle
}
if (data.longCycle < minCycleLong){
minCycleLong = data.longCycle
}
periodLong += data.longPeriod
activeMonth++
}
when (querySnapshot.id){
Const.KEY_JAN -> { menstrualPeriodMonthly.jan = data }
Const.KEY_FEB -> { menstrualPeriodMonthly.feb = data }
Const.KEY_MAR -> { menstrualPeriodMonthly.mar = data }
Const.KEY_APR -> { menstrualPeriodMonthly.apr = data }
Const.KEY_MAY -> { menstrualPeriodMonthly.may = data }
Const.KEY_JUN -> { menstrualPeriodMonthly.jun = data }
Const.KEY_JUL -> { menstrualPeriodMonthly.jul = data }
Const.KEY_AUG -> { menstrualPeriodMonthly.aug = data }
Const.KEY_SEP -> { menstrualPeriodMonthly.sep = data }
Const.KEY_OCT -> { menstrualPeriodMonthly.oct = data }
Const.KEY_NOV -> { menstrualPeriodMonthly.nov = data }
Const.KEY_DEC -> { menstrualPeriodMonthly.dec = data }
}
}
periodLong /= activeMonth
}
progressGetMenstrualRecord.postValue(false)
successGetMenstrualRecord.postValue(menstrualPeriodMonthly)
}
.addOnFailureListener {exception ->
progressGetMenstrualRecord.postValue(false)
errorGetMenstrualRecord.postValue(exception.message)
}
}catch (e: Exception){
progressGetMenstrualRecord.postValue(false)
errorGetMenstrualRecord.postValue(e.message)
}
}
}
val progressAddMenstrualRecord = MutableLiveData<Boolean>()
val successAddMenstrualRecord = MutableLiveData<MenstrualPeriodResumeIntent>()
val errorAddMenstrualRecord = MutableLiveData<String>()
fun addMenstrualPeriod(menstrualPeriodResume: MenstrualPeriodResumeIntent, date: Date){
val month = SimpleDateFormat("MMMM", Locale.US).format(date)
addMenstrualResumeDataMonth(month, menstrualPeriodResume)
CoroutineScope(Dispatchers.IO).launch {
repository.addMenstrualPeriod(menstrualPeriodResumeMapper.mapFromIntent(menstrualPeriodResume)!!, object:
BaseFirebaseListener<MenstrualPeriodResume> {
override fun onLoading(isLoading: Boolean) {
progressAddMenstrualRecord.postValue(isLoading)
}
override fun onSuccess(data: MenstrualPeriodResume) {
successAddMenstrualRecord.postValue(menstrualPeriodResumeMapper.mapToIntent(data))
}
override fun onFailed(errorMessage: String) {
errorAddMenstrualRecord.postValue(errorMessage)
}
})
}
}
fun getMenstrualResumeDataCurrentMonth(month: String): MenstrualPeriodResumeIntent? {
return when (month){
Const.KEY_JAN -> activeYearData?.jan
Const.KEY_FEB -> activeYearData?.feb
Const.KEY_MAR -> activeYearData?.mar
Const.KEY_APR -> activeYearData?.apr
Const.KEY_MAY -> activeYearData?.may
Const.KEY_JUN -> activeYearData?.jun
Const.KEY_JUL -> activeYearData?.jul
Const.KEY_AUG -> activeYearData?.aug
Const.KEY_SEP -> activeYearData?.sep
Const.KEY_OCT -> activeYearData?.oct
Const.KEY_NOV -> activeYearData?.nov
Const.KEY_DEC -> activeYearData?.dec
else -> null
}
}
private fun addMenstrualResumeDataMonth(month: String, data: MenstrualPeriodResumeIntent) {
when (month){
Const.KEY_JAN -> activeYearData?.jan = data
Const.KEY_FEB -> activeYearData?.feb = data
Const.KEY_MAR -> activeYearData?.mar = data
Const.KEY_APR -> activeYearData?.apr = data
Const.KEY_MAY -> activeYearData?.may = data
Const.KEY_JUN -> activeYearData?.jun = data
Const.KEY_JUL -> activeYearData?.jul = data
Const.KEY_AUG -> activeYearData?.aug = data
Const.KEY_SEP -> activeYearData?.sep = data
Const.KEY_OCT -> activeYearData?.oct = data
Const.KEY_NOV -> activeYearData?.nov = data
Const.KEY_DEC -> activeYearData?.dec = data
}
}
}
2 things are present in logcat i.e "cannot create an instance of ViewModel" and "ViewModel has no zero argument constructor". In this scenario, what should be done?
I recently came into the field of Android development so I'm not having much idea on what to do next.
Upvotes: 1
Views: 1178
Answers (2)
Naum Djordjevic
Reputation: 11
I was having the same error. I my case I was missing @AndroidEntryPoint annotation in fragment that created the viewModel and you need to annotate your viewModel as @HiltViewModel.
Upvotes: 0
Ivo
Reputation: 23244
It's because you commented out @HiltViewModel.
Change
//@HiltViewModel
to
@HiltViewModel
Upvotes: 4
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