我试图改变debtCategory的值给"贷款人";或";Borrower"。我在视图模型中引入了两个方法来更新debtCategory。逻辑如下:
- 如果用户单击addLender然后updateLender调用视图模型中的方法，该方法使用"Lender"更新debtCategory值
- 如果用户点击add借款人然后updateBorrower方法更新debtCategory与"Borrower"值
目前没有错误，但是debtCatery没有相应更新。非常感谢你的帮助。
Thanks in advance
这是我的代码:
1。VIEWMODEL
import android.content.Context
import android.text.Editable
import android.util.Log
import android.widget.ArrayAdapter
import android.widget.AutoCompleteTextView
import androidx.databinding.Bindable
import androidx.databinding.Observable
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import com.droid.f.debtmanagement.R
import com.droid.f.debtmanagement.models.Debtor
import com.droid.f.debtmanagement.repository.DebtManagementRepository
import com.droid.f.debtmanagement.util.Util
import kotlinx.coroutines.Job
import kotlinx.coroutines.launch
class DebtViewModel(private val debtManagementRepository: DebtManagementRepository)
: ViewModel(),Observable {
//all debtors
val allLenders = debtManagementRepository.getAllLenders()
val allBorrowers = debtManagementRepository.getAllBorrowers()
private val util = Util()
var debtCategory: String = ""
@Bindable
val clientName = MutableLiveData<String>()
@Bindable
val phoneNumber = MutableLiveData<String>()
@Bindable
val debtorAmount = MutableLiveData<String>()
@Bindable
val amountPaid = MutableLiveData<String>()
@Bindable
val period = MutableLiveData<String>()
private val datelend = MutableLiveData<String>()
private val dateToPay = MutableLiveData<String>()
private val debtStatus = MutableLiveData<String>()
private val timeBorrowed = MutableLiveData<String>()
private val remainingAmount = MutableLiveData<Double>()
init {
debtStatus.value = "Pending"
}
fun saveUpdate(){
val debtorName: String = clientName.value!!
val debtorPhone: String = phoneNumber.value!!
val debtAmount: Double = debtorAmount.value!!.toDouble()
val period: Int = monthsToDays()
val debtAmountPaid: Double = amountPaid.value!!.toDouble()
val debtorDateLend: String = dateBorrowedLend()
val debtorDateToPay: String = _dueDate()
val debtorStatus: String = checkProgress()
val debtTimeBorrowed: String = exactTimeBorrowed()
val remainingAmount: Double = remainingAmount()
val dtCategory: String = debtCategory
insertDebtor(
Debtor(
0, dtCategory, debtorName, debtorPhone, debtAmount, debtAmountPaid,period, debtorDateLend, debtorDateToPay, debtorStatus,
debtTimeBorrowed, remainingAmount
))
clearFields()
}
fun clearFields(){
clientName.value = null
phoneNumber.value = null
debtorAmount.value = null
period.value = null
amountPaid.value = null
}
fun updateLender(){
debtCategory = "Lender"
}
fun updateBorrower(){
debtCategory = "Borrower"
}
//Months to Date
private fun monthsToDays(): Int{
return util.monthsToDays(period.value!!.toInt())
}
//Date borroewed/lend
private fun dateBorrowedLend(): String{
return util.dateNow()
}
//Time borrowed/lend
private fun exactTimeBorrowed(): String{
return util.timeNow()
}
//Due date method
private fun _dueDate(): String{
return util.dueDate(util.monthsToDays(period.value!!.toInt()))
}
//remaining amount method
private fun remainingAmount(): Double{
return util.remainingDebt(debtorAmount.value!!.toDouble(), amountPaid.value!!.toDouble())
}
//check progress
private fun checkProgress(): String{
return util.checkProgress(debtorAmount.value!!.toDouble(), amountPaid.value!!.toDouble())
}
private fun insertDebtor(debtor: Debtor): Job = viewModelScope.launch {
debtManagementRepository.insertDebtor(debtor)
}
fun updateDebtor(debtor: Debtor): Job = viewModelScope.launch {
debtManagementRepository.updateDebtor(debtor)
}
fun deleteDebtor(debtor: Debtor): Job = viewModelScope.launch {
debtManagementRepository.deleteDebtor(debtor)
}
fun deleteAllDebtors(): Job = viewModelScope.launch {
debtManagementRepository.deleteAllDebtors()
}
override fun addOnPropertyChangedCallback(callback: Observable.OnPropertyChangedCallback?) {
}
override fun removeOnPropertyChangedCallback(callback: Observable.OnPropertyChangedCallback?) {
}
}
2。MAINACTIVITY:
class MainActivity : AppCompatActivity() {
lateinit var binding: ActivityMainBinding
private var mDebtViewModel: DebtViewModel? = null
private lateinit var repository: DebtManagementRepository
private lateinit var factory: DebtManagementViewModelFactory
private lateinit var debtDatabase: DebtManagementDatabase
//initialize animation files
private val rotateOpen: Animation by lazy{ AnimationUtils.loadAnimation(this, R.anim.rotate_to_open_anim)}
private val rotateToClose: Animation by lazy { AnimationUtils.loadAnimation(this, R.anim.rotate_to_close_anim) }
private val fromBottom: Animation by lazy { AnimationUtils.loadAnimation(this, R.anim.from_bottom_anim) }
private val toBottom: Animation by lazy { AnimationUtils.loadAnimation(this, R.anim.to_bottom_anim) }
private var isOpen: Boolean = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
debtDatabase = DebtManagementDatabase.getDataBase(this)
repository = DebtManagementRepository(debtDatabase)
factory = DebtManagementViewModelFactory(repository)
mDebtViewModel = ViewModelProvider(this, factory).get(DebtViewModel::class.java)
binding.debtViewModel = mDebtViewModel
binding.lifecycleOwner = this
binding.addFab.setOnClickListener {
onAddFabClicked()
}
binding.addLender.setOnClickListener {
newDebtorActivity()
mDebtViewModel!!.updateLender()
}
binding.addBorrower.setOnClickListener {
newDebtorActivity()
mDebtViewModel!!.updateBorrower()
}
addTabsAndIntializePager()
}
private fun onAddFabClicked() {
setVisibility(isOpen)
setAnimation(isOpen)
isOpen = !isOpen
}
private fun setVisibility(isOpen: Boolean) {
if (!isOpen){
binding.addBorrower.visibility = View.VISIBLE
binding.addLender.visibility = View.VISIBLE
}else{
binding.addBorrower.visibility = View.INVISIBLE
binding.addLender.visibility = View.INVISIBLE
}
}
private fun setAnimation(isOpen: Boolean) {
if (!isOpen){
binding.addFab.startAnimation(rotateOpen)
binding.addLender.startAnimation(fromBottom)
binding.addBorrower.startAnimation(fromBottom)
}else{
binding.addFab.startAnimation(rotateToClose)
binding.addLender.startAnimation(toBottom)
binding.addBorrower.startAnimation(toBottom)
}
}
private fun newDebtorActivity() {
startActivity(Intent(this, EditActivity::class.java))
binding.addBorrower.visibility = View.INVISIBLE
binding.addLender.visibility = View.INVISIBLE
}
private fun addTabsAndIntializePager() {
binding.viewPager.adapter = ViewPagerAdapter(supportFragmentManager, lifecycle)
TabLayoutMediator(binding.debtManagementTab, binding.viewPager){tab, position->
when(position){
0->{
tab.text = "Borrowers"
}
1->{
tab.text = "Lenders"
}
}
}.attach()
}
}
与其将debtCategory设置为字符串，不如将其更改为可变的实时数据
...
// from var debtCategory: String = ""
// change it to
val debtCategory = MutableLiveData<String>()
...
fun updateDebtCategory(newValue: String){
debtCategory.value = newValue
}
你可以在activity
中调用它viewModel.updateDebtCategory("Borrower")
//or
viewModel.updateDebtCategory("Lander")
您的Viewmodel类是OK的。问题是你在MainActivity中的两种方法在这里，您在更新值之前导航下一个活动。先呼叫mDebtViewModel!!.updateLender()、mDebtViewModel!!.updateBorrower()，再呼叫newDebtorActivity()
这是你的代码
binding.addLender.setOnClickListener {
newDebtorActivity()
mDebtViewModel!!.updateLender()
}
binding.addBorrower.setOnClickListener {
newDebtorActivity()
mDebtViewModel!!.updateBorrower()
}
应该是
binding.addLender.setOnClickListener {
mDebtViewModel!!.updateLender()
newDebtorActivity()
}
binding.addBorrower.setOnClickListener {
mDebtViewModel!!.updateBorrower()
newDebtorActivity()
}