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Fodor Patrik
SzobatárSCH
Commits
0b6e0fd3
Commit
0b6e0fd3
authored
3 years ago
by
Fodor Patrik
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Add network connection check
parent
907fc891
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app/src/main/java/hu/bme/kszk/szobatarsch/data/networkConnection.kt
+87
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app/src/main/java/hu/bme/kszk/szobatarsch/data/networkConnection.kt
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0b6e0fd3
package
hu.bme.kszk.szobatarsch.data
import
android.content.Context
import
android.net.ConnectivityManager
import
android.net.Network
import
android.net.NetworkCapabilities
import
android.net.NetworkRequest
import
androidx.compose.runtime.Composable
import
androidx.compose.runtime.State
import
androidx.compose.runtime.produceState
import
androidx.compose.ui.platform.LocalContext
import
kotlinx.coroutines.ExperimentalCoroutinesApi
import
kotlinx.coroutines.channels.awaitClose
import
kotlinx.coroutines.flow.callbackFlow
//Source: https://medium.com/scalereal/observing-live-connectivity-status-in-jetpack-compose-way-f849ce8431c7 and https://github.com/PatilShreyas/NotyKT
sealed
class
ConnectionState
{
object
Available
:
ConnectionState
()
object
Unavailable
:
ConnectionState
()
}
val
Context
.
currentConnectivityState
:
ConnectionState
get
()
{
val
connectivityManager
=
getSystemService
(
Context
.
CONNECTIVITY_SERVICE
)
as
ConnectivityManager
return
getCurrentConnectivityState
(
connectivityManager
)
}
private
fun
getCurrentConnectivityState
(
connectivityManager
:
ConnectivityManager
):
ConnectionState
{
val
connected
=
connectivityManager
.
allNetworks
.
any
{
network
->
connectivityManager
.
getNetworkCapabilities
(
network
)
?.
hasCapability
(
NetworkCapabilities
.
NET_CAPABILITY_INTERNET
)
?:
false
}
return
if
(
connected
)
ConnectionState
.
Available
else
ConnectionState
.
Unavailable
}
@ExperimentalCoroutinesApi
fun
Context
.
observeConnectivityAsFlow
()
=
callbackFlow
{
val
connectivityManager
=
getSystemService
(
Context
.
CONNECTIVITY_SERVICE
)
as
ConnectivityManager
val
callback
=
NetworkCallback
{
connectionState
->
trySend
(
connectionState
)
}
val
networkRequest
=
NetworkRequest
.
Builder
()
.
addCapability
(
NetworkCapabilities
.
NET_CAPABILITY_INTERNET
)
.
build
()
connectivityManager
.
registerNetworkCallback
(
networkRequest
,
callback
)
// Set current state
val
currentState
=
getCurrentConnectivityState
(
connectivityManager
)
trySend
(
currentState
)
// Remove callback when not used
awaitClose
{
// Remove listeners
connectivityManager
.
unregisterNetworkCallback
(
callback
)
}
}
fun
NetworkCallback
(
callback
:
(
ConnectionState
)
->
Unit
):
ConnectivityManager
.
NetworkCallback
{
return
object
:
ConnectivityManager
.
NetworkCallback
()
{
override
fun
onAvailable
(
network
:
Network
)
{
callback
(
ConnectionState
.
Available
)
}
override
fun
onLost
(
network
:
Network
)
{
callback
(
ConnectionState
.
Unavailable
)
}
}
}
@ExperimentalCoroutinesApi
@Composable
fun
connectivityState
():
State
<
ConnectionState
>
{
val
context
=
LocalContext
.
current
// Creates a State<ConnectionState> with current connectivity state as initial value
return
produceState
(
initialValue
=
context
.
currentConnectivityState
)
{
// In a coroutine, can make suspend calls
context
.
observeConnectivityAsFlow
().
collect
{
value
=
it
}
}
}
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