Kotlin How to init BluetoothDevice
I want to use bluetooth printer in my project, but I got this error
lateinit property mmDevice has been not initialized
This is my code
lateinit var device:String
lateinit var mBluetoothAdapter: BluetoothAdapter
lateinit var mmSocket: BluetoothSocket
lateinit var mmDevice: BluetoothDevice
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_penjualan_cetak)
device = Function().getShared("printer","",this)
try {
findBT()
} catch (e: Exception) {
}
}
fun findBT(){
try{
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
val paireddevice = mBluetoothAdapter.bondedDevices
if(paireddevice.size > 0){
ePrinter.setText("Printer Belum Dipilih")
for (device:BluetoothDevice in paireddevice) {
if (device.name == this.device) {
// this is the error come from
mmDevice = device
break
}
}
}
}catch (e:Exception){
e.printStackTrace()
}
}
How can I init the bluetoothdevice in koltin?, I have tried some solution but it not works
android bluetooth kotlin kotlin-lateinit asked Aug 6 at 1:51
Firman
62
add a comment |
I want to use bluetooth printer in my project, but I got this error
lateinit property mmDevice has been not initialized
This is my code
lateinit var device:String
lateinit var mBluetoothAdapter: BluetoothAdapter
lateinit var mmSocket: BluetoothSocket
lateinit var mmDevice: BluetoothDevice
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_penjualan_cetak)
device = Function().getShared("printer","",this)
try {
findBT()
} catch (e: Exception) {
}
}
fun findBT(){
try{
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
val paireddevice = mBluetoothAdapter.bondedDevices
if(paireddevice.size > 0){
ePrinter.setText("Printer Belum Dipilih")
for (device:BluetoothDevice in paireddevice) {
if (device.name == this.device) {
// this is the error come from
mmDevice = device
break
}
}
}
}catch (e:Exception){
e.printStackTrace()
}
}
How can I init the bluetoothdevice in koltin?, I have tried some solution but it not works
android bluetooth kotlin kotlin-lateinit asked Aug 6 at 1:51
Firman
62
Are you sure the error is coming from this line? You don't usemmDeviceat any other position in your code?
– Christopher
Nov 20 at 13:17
Agree with @Christopher. Anyway you can change your mmDevice to nullable type and get rid of lateinit: var mmDevice: BluetoothDevice? = null
– Andrei Vinogradov
Nov 20 at 13:20
add a comment |
I want to use bluetooth printer in my project, but I got this error
lateinit property mmDevice has been not initialized
This is my code
lateinit var device:String
lateinit var mBluetoothAdapter: BluetoothAdapter
lateinit var mmSocket: BluetoothSocket
lateinit var mmDevice: BluetoothDevice
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_penjualan_cetak)
device = Function().getShared("printer","",this)
try {
findBT()
} catch (e: Exception) {
}
}
fun findBT(){
try{
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
val paireddevice = mBluetoothAdapter.bondedDevices
if(paireddevice.size > 0){
ePrinter.setText("Printer Belum Dipilih")
for (device:BluetoothDevice in paireddevice) {
if (device.name == this.device) {
// this is the error come from
mmDevice = device
break
}
}
}
}catch (e:Exception){
e.printStackTrace()
}
}
How can I init the bluetoothdevice in koltin?, I have tried some solution but it not works
android bluetooth kotlin kotlin-lateinit asked Aug 6 at 1:51
Firman
62
I want to use bluetooth printer in my project, but I got this error
lateinit property mmDevice has been not initialized
This is my code
lateinit var device:String
lateinit var mBluetoothAdapter: BluetoothAdapter
lateinit var mmSocket: BluetoothSocket
lateinit var mmDevice: BluetoothDevice
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_penjualan_cetak)
device = Function().getShared("printer","",this)
try {
findBT()
} catch (e: Exception) {
}
}
fun findBT(){
try{
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
val paireddevice = mBluetoothAdapter.bondedDevices
if(paireddevice.size > 0){
ePrinter.setText("Printer Belum Dipilih")
for (device:BluetoothDevice in paireddevice) {
if (device.name == this.device) {
// this is the error come from
mmDevice = device
break
}
}
}
}catch (e:Exception){
e.printStackTrace()
}
}
How can I init the bluetoothdevice in koltin?, I have tried some solution but it not works
android bluetooth kotlin kotlin-lateinit android bluetooth kotlin kotlin-lateinit asked Aug 6 at 1:51
Firman
62
asked Aug 6 at 1:51
Firman
62
asked Aug 6 at 1:51
Firman
62
asked Aug 6 at 1:51
Firman
62
asked Aug 6 at 1:51
Firman
62
62
Are you sure the error is coming from this line? You don't usemmDeviceat any other position in your code?
– Christopher
Nov 20 at 13:17
Agree with @Christopher. Anyway you can change your mmDevice to nullable type and get rid of lateinit: var mmDevice: BluetoothDevice? = null
– Andrei Vinogradov
Nov 20 at 13:20
add a comment |
Are you sure the error is coming from this line? You don't usemmDeviceat any other position in your code?
– Christopher
Nov 20 at 13:17
Agree with @Christopher. Anyway you can change your mmDevice to nullable type and get rid of lateinit: var mmDevice: BluetoothDevice? = null
– Andrei Vinogradov
Nov 20 at 13:20
Are you sure the error is coming from this line? You don't use
mmDevice at any other position in your code?– Christopher
Nov 20 at 13:17
Are you sure the error is coming from this line? You don't use
mmDevice at any other position in your code?– Christopher
Nov 20 at 13:17
Agree with @Christopher. Anyway you can change your mmDevice to nullable type and get rid of lateinit: var mmDevice: BluetoothDevice? = null
– Andrei Vinogradov
Nov 20 at 13:20
Agree with @Christopher. Anyway you can change your mmDevice to nullable type and get rid of lateinit: var mmDevice: BluetoothDevice? = null
– Andrei Vinogradov
Nov 20 at 13:20
add a comment |
1 Answer
1
active
oldest
votes
I think, that you did not post all your code and point us to a wrong line where error happen. This error can occur only when you trying to access not initialized lateinit property. I can imagine, that your findBT method is not finding any sutable device, so your mmDevice is not initialized.
You should use lateinit only when you 100% sure, that property will be initialized before first use. Searching BT device - not that case. So I suggest you to change that line:
lateinit var mmDevice: BluetoothDevice
to that line:
var mmDevice: BluetoothDevice? = null
and use null-checks or safe calls on it in your code.
answered Nov 20 at 13:25
Andrei Vinogradov
619417
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
I think, that you did not post all your code and point us to a wrong line where error happen. This error can occur only when you trying to access not initialized lateinit property. I can imagine, that your findBT method is not finding any sutable device, so your mmDevice is not initialized.
You should use lateinit only when you 100% sure, that property will be initialized before first use. Searching BT device - not that case. So I suggest you to change that line:
lateinit var mmDevice: BluetoothDevice
to that line:
var mmDevice: BluetoothDevice? = null
and use null-checks or safe calls on it in your code.
answered Nov 20 at 13:25
Andrei Vinogradov
619417
add a comment |
I think, that you did not post all your code and point us to a wrong line where error happen. This error can occur only when you trying to access not initialized lateinit property. I can imagine, that your findBT method is not finding any sutable device, so your mmDevice is not initialized.
You should use lateinit only when you 100% sure, that property will be initialized before first use. Searching BT device - not that case. So I suggest you to change that line:
lateinit var mmDevice: BluetoothDevice
to that line:
var mmDevice: BluetoothDevice? = null
and use null-checks or safe calls on it in your code.
answered Nov 20 at 13:25
Andrei Vinogradov
619417
add a comment |
I think, that you did not post all your code and point us to a wrong line where error happen. This error can occur only when you trying to access not initialized lateinit property. I can imagine, that your findBT method is not finding any sutable device, so your mmDevice is not initialized.
You should use lateinit only when you 100% sure, that property will be initialized before first use. Searching BT device - not that case. So I suggest you to change that line:
lateinit var mmDevice: BluetoothDevice
to that line:
var mmDevice: BluetoothDevice? = null
and use null-checks or safe calls on it in your code.
answered Nov 20 at 13:25
Andrei Vinogradov
619417
I think, that you did not post all your code and point us to a wrong line where error happen. This error can occur only when you trying to access not initialized lateinit property. I can imagine, that your findBT method is not finding any sutable device, so your mmDevice is not initialized.
You should use lateinit only when you 100% sure, that property will be initialized before first use. Searching BT device - not that case. So I suggest you to change that line:
lateinit var mmDevice: BluetoothDevice
to that line:
var mmDevice: BluetoothDevice? = null
and use null-checks or safe calls on it in your code.
answered Nov 20 at 13:25
Andrei Vinogradov
619417
answered Nov 20 at 13:25
Andrei Vinogradov
619417
answered Nov 20 at 13:25
Andrei Vinogradov
619417
answered Nov 20 at 13:25
Andrei Vinogradov
619417
619417
add a comment |
add a comment |
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Are you sure the error is coming from this line? You don't use
mmDeviceat any other position in your code?– Christopher
Nov 20 at 13:17
Agree with @Christopher. Anyway you can change your mmDevice to nullable type and get rid of lateinit: var mmDevice: BluetoothDevice? = null
– Andrei Vinogradov
Nov 20 at 13:20