当我访问应用程序并访问此片段(menstralfragment)时，应用程序崩溃，这显示在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
}
}
}
logcat中存在两件事，即"不能创建viewmodel的实例";和ViewModel没有零参数构造函数。在这种情况下，应该做什么?
我最近才进入Android开发领域，所以我不太清楚下一步该做什么。
因为你注释掉了@HiltViewModel
//@HiltViewModel
@HiltViewModel
我也有同样的错误。在我的情况下，我在创建viewModel的片段中缺少@AndroidEntryPoint注释，您需要将viewModel注释为@HiltViewModel。