variable initialized in Kotlin
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in this class below there is two Dates StartDate && EndDate i give them Values in
fun check_date() but in fun DateIsChecked() when i try to print the two Values it print null Why?
i try to use lateinit but it did not work
companion object {
//Today Date
var today = Calendar.getInstance().time
//Date Format
val sdf = SimpleDateFormat("yyyy/MM/dd")
var calender = Calendar.getInstance()
//Dates Of Plan
var StartDate: java.util.Date? = null
var EndDate: java.util.Date? = null
//Int Value Fore Loop
var i = 0
}
//Check Plan Dates in Database
fun check_date(){
var Ref = FirebaseDatabase.getInstance().reference
Ref.keepSynced(true)//Enable Data Synced
Ref.child("Plan").addListenerForSingleValueEvent(object : ValueEventListener {
override fun onCancelled(p0: DatabaseError) {
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}//End onCancelled
override fun onDataChange(p0: DataSnapshot){
for (date in p0.children) {
var item = date.getValue(Date::class.java)
if (i == 0) {
i = 1
calender.time = sdf.parse(item!!.Date)
EndDate = calender.time
} else {
i = 0
calender.time = sdf.parse(item!!.Date)
StartDate = calender.time
}//End else
}//End For
}//End onDataChange
})//End addValueEventListener
}//End
//Chick in Today Date In Date Range And Return The Result: Boolean
open fun DateIsChecked(): Boolean{
check_date()
Log.e("Date",today.toString())
Log.e("Date", StartDate.toString())
Log.e("Date", EndDate.toString())
return true
}
android kotlin asked Nov 23 '18 at 13:27
FOS AUFOS AU
115
add a comment |
0
in this class below there is two Dates StartDate && EndDate i give them Values in
fun check_date() but in fun DateIsChecked() when i try to print the two Values it print null Why?
i try to use lateinit but it did not work
companion object {
//Today Date
var today = Calendar.getInstance().time
//Date Format
val sdf = SimpleDateFormat("yyyy/MM/dd")
var calender = Calendar.getInstance()
//Dates Of Plan
var StartDate: java.util.Date? = null
var EndDate: java.util.Date? = null
//Int Value Fore Loop
var i = 0
}
//Check Plan Dates in Database
fun check_date(){
var Ref = FirebaseDatabase.getInstance().reference
Ref.keepSynced(true)//Enable Data Synced
Ref.child("Plan").addListenerForSingleValueEvent(object : ValueEventListener {
override fun onCancelled(p0: DatabaseError) {
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}//End onCancelled
override fun onDataChange(p0: DataSnapshot){
for (date in p0.children) {
var item = date.getValue(Date::class.java)
if (i == 0) {
i = 1
calender.time = sdf.parse(item!!.Date)
EndDate = calender.time
} else {
i = 0
calender.time = sdf.parse(item!!.Date)
StartDate = calender.time
}//End else
}//End For
}//End onDataChange
})//End addValueEventListener
}//End
//Chick in Today Date In Date Range And Return The Result: Boolean
open fun DateIsChecked(): Boolean{
check_date()
Log.e("Date",today.toString())
Log.e("Date", StartDate.toString())
Log.e("Date", EndDate.toString())
return true
}
asked Nov 23 '18 at 13:27
FOS AUFOS AU
115
1
They're only going to be assigned if whatever is in yourPlanreference actually changes.
– TheWanderer
Nov 23 '18 at 13:28
add a comment |
0
0
0
in this class below there is two Dates StartDate && EndDate i give them Values in
fun check_date() but in fun DateIsChecked() when i try to print the two Values it print null Why?
i try to use lateinit but it did not work
companion object {
//Today Date
var today = Calendar.getInstance().time
//Date Format
val sdf = SimpleDateFormat("yyyy/MM/dd")
var calender = Calendar.getInstance()
//Dates Of Plan
var StartDate: java.util.Date? = null
var EndDate: java.util.Date? = null
//Int Value Fore Loop
var i = 0
}
//Check Plan Dates in Database
fun check_date(){
var Ref = FirebaseDatabase.getInstance().reference
Ref.keepSynced(true)//Enable Data Synced
Ref.child("Plan").addListenerForSingleValueEvent(object : ValueEventListener {
override fun onCancelled(p0: DatabaseError) {
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}//End onCancelled
override fun onDataChange(p0: DataSnapshot){
for (date in p0.children) {
var item = date.getValue(Date::class.java)
if (i == 0) {
i = 1
calender.time = sdf.parse(item!!.Date)
EndDate = calender.time
} else {
i = 0
calender.time = sdf.parse(item!!.Date)
StartDate = calender.time
}//End else
}//End For
}//End onDataChange
})//End addValueEventListener
}//End
//Chick in Today Date In Date Range And Return The Result: Boolean
open fun DateIsChecked(): Boolean{
check_date()
Log.e("Date",today.toString())
Log.e("Date", StartDate.toString())
Log.e("Date", EndDate.toString())
return true
}
asked Nov 23 '18 at 13:27
FOS AUFOS AU
115
in this class below there is two Dates StartDate && EndDate i give them Values in
fun check_date() but in fun DateIsChecked() when i try to print the two Values it print null Why?
i try to use lateinit but it did not work
companion object {
//Today Date
var today = Calendar.getInstance().time
//Date Format
val sdf = SimpleDateFormat("yyyy/MM/dd")
var calender = Calendar.getInstance()
//Dates Of Plan
var StartDate: java.util.Date? = null
var EndDate: java.util.Date? = null
//Int Value Fore Loop
var i = 0
}
//Check Plan Dates in Database
fun check_date(){
var Ref = FirebaseDatabase.getInstance().reference
Ref.keepSynced(true)//Enable Data Synced
Ref.child("Plan").addListenerForSingleValueEvent(object : ValueEventListener {
override fun onCancelled(p0: DatabaseError) {
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}//End onCancelled
override fun onDataChange(p0: DataSnapshot){
for (date in p0.children) {
var item = date.getValue(Date::class.java)
if (i == 0) {
i = 1
calender.time = sdf.parse(item!!.Date)
EndDate = calender.time
} else {
i = 0
calender.time = sdf.parse(item!!.Date)
StartDate = calender.time
}//End else
}//End For
}//End onDataChange
})//End addValueEventListener
}//End
//Chick in Today Date In Date Range And Return The Result: Boolean
open fun DateIsChecked(): Boolean{
check_date()
Log.e("Date",today.toString())
Log.e("Date", StartDate.toString())
Log.e("Date", EndDate.toString())
return true
}
asked Nov 23 '18 at 13:27
FOS AUFOS AU
115
asked Nov 23 '18 at 13:27
FOS AUFOS AU
115
asked Nov 23 '18 at 13:27
FOS AUFOS AU
115
asked Nov 23 '18 at 13:27
FOS AUFOS AU
115
asked Nov 23 '18 at 13:27
FOS AUFOS AU
115
115
1
They're only going to be assigned if whatever is in yourPlanreference actually changes.
– TheWanderer
Nov 23 '18 at 13:28
add a comment |
1
They're only going to be assigned if whatever is in yourPlanreference actually changes.
– TheWanderer
Nov 23 '18 at 13:28
1
1
They're only going to be assigned if whatever is in your
Plan reference actually changes.– TheWanderer
Nov 23 '18 at 13:28
They're only going to be assigned if whatever is in your
Plan reference actually changes.– TheWanderer
Nov 23 '18 at 13:28
add a comment |
1 Answer
1
active
oldest
votes
0
in check_date method you just added a listener for changing on 'Plan'. so the onDataChange method is not called and your StartDate and EndDate will not get those value until your plan data changes.
edited Nov 25 '18 at 14:44
Jayson Minard
42.3k19117177
answered Nov 23 '18 at 14:13
Reza.AbediniReza.Abedini
1,1291914
add a comment |
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1 Answer
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active
oldest
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oldest
votes
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oldest
votes
0
in check_date method you just added a listener for changing on 'Plan'. so the onDataChange method is not called and your StartDate and EndDate will not get those value until your plan data changes.
edited Nov 25 '18 at 14:44
Jayson Minard
42.3k19117177
answered Nov 23 '18 at 14:13
Reza.AbediniReza.Abedini
1,1291914
add a comment |
0
in check_date method you just added a listener for changing on 'Plan'. so the onDataChange method is not called and your StartDate and EndDate will not get those value until your plan data changes.
edited Nov 25 '18 at 14:44
Jayson Minard
42.3k19117177
answered Nov 23 '18 at 14:13
Reza.AbediniReza.Abedini
1,1291914
add a comment |
0
0
0
in check_date method you just added a listener for changing on 'Plan'. so the onDataChange method is not called and your StartDate and EndDate will not get those value until your plan data changes.
edited Nov 25 '18 at 14:44
Jayson Minard
42.3k19117177
answered Nov 23 '18 at 14:13
Reza.AbediniReza.Abedini
1,1291914
in check_date method you just added a listener for changing on 'Plan'. so the onDataChange method is not called and your StartDate and EndDate will not get those value until your plan data changes.
edited Nov 25 '18 at 14:44
Jayson Minard
42.3k19117177
answered Nov 23 '18 at 14:13
Reza.AbediniReza.Abedini
1,1291914
edited Nov 25 '18 at 14:44
Jayson Minard
42.3k19117177
edited Nov 25 '18 at 14:44
Jayson Minard
42.3k19117177
edited Nov 25 '18 at 14:44
Jayson Minard
42.3k19117177
42.3k19117177
answered Nov 23 '18 at 14:13
Reza.AbediniReza.Abedini
1,1291914
answered Nov 23 '18 at 14:13
Reza.AbediniReza.Abedini
1,1291914
answered Nov 23 '18 at 14:13
Reza.AbediniReza.Abedini
1,1291914
1,1291914
add a comment |
add a comment |
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1
They're only going to be assigned if whatever is in your
Planreference actually changes.– TheWanderer
Nov 23 '18 at 13:28