Mixing
How to change state of Bluetooth on iOS is PowerOn on Xamarin Forms?
On iOS, I only can check state of Bluetooth. I'm find the solutions on network and use it.
public class CallBluetoothIphoneService : ICallBlueTooth
{
public void LaunchBluetoothOnPhone()
{
try
{
// Is bluetooth enabled?
var bluetoothManager = new CBCentralManager();
if (bluetoothManager.State == CBCentralManagerState.PoweredOff|| bluetoothManager.State == CBCentralManagerState.Unknown)
// Does not go directly to bluetooth on every OS version though, but opens the Settings on most
UIApplication.SharedApplication.OpenUrl(new NSUrl("App-Prefs:root=Bluetooth"));
}
catch (Exception ex)
{
Console.WriteLine(ex);
throw;
}
}
}
But when I try turn off Bluetooth and test code, state of bluetooth is "Unknown".
Then I run code, device open settings, toggle button has color green (turn on bluetooth), but when I check state of Bluetooth in code, State of Bluetooth is "Unknown", is not "Power on".
I'm using Xamarin 3.3 and test on device iOS version 12.0.
xamarin xamarin.forms xamarin.ios ios-bluetooth
edited Nov 19 '18 at 15:37
Ahmed Ashour
3,530102442
asked Nov 19 '18 at 15:35
Huu Bao Nguyen
21112
add a comment |
On iOS, I only can check state of Bluetooth. I'm find the solutions on network and use it.
public class CallBluetoothIphoneService : ICallBlueTooth
{
public void LaunchBluetoothOnPhone()
{
try
{
// Is bluetooth enabled?
var bluetoothManager = new CBCentralManager();
if (bluetoothManager.State == CBCentralManagerState.PoweredOff|| bluetoothManager.State == CBCentralManagerState.Unknown)
// Does not go directly to bluetooth on every OS version though, but opens the Settings on most
UIApplication.SharedApplication.OpenUrl(new NSUrl("App-Prefs:root=Bluetooth"));
}
catch (Exception ex)
{
Console.WriteLine(ex);
throw;
}
}
}
But when I try turn off Bluetooth and test code, state of bluetooth is "Unknown".
Then I run code, device open settings, toggle button has color green (turn on bluetooth), but when I check state of Bluetooth in code, State of Bluetooth is "Unknown", is not "Power on".
I'm using Xamarin 3.3 and test on device iOS version 12.0.
xamarin xamarin.forms xamarin.ios ios-bluetooth
edited Nov 19 '18 at 15:37
Ahmed Ashour
3,530102442
asked Nov 19 '18 at 15:35
Huu Bao Nguyen
21112
add a comment |
On iOS, I only can check state of Bluetooth. I'm find the solutions on network and use it.
public class CallBluetoothIphoneService : ICallBlueTooth
{
public void LaunchBluetoothOnPhone()
{
try
{
// Is bluetooth enabled?
var bluetoothManager = new CBCentralManager();
if (bluetoothManager.State == CBCentralManagerState.PoweredOff|| bluetoothManager.State == CBCentralManagerState.Unknown)
// Does not go directly to bluetooth on every OS version though, but opens the Settings on most
UIApplication.SharedApplication.OpenUrl(new NSUrl("App-Prefs:root=Bluetooth"));
}
catch (Exception ex)
{
Console.WriteLine(ex);
throw;
}
}
}
But when I try turn off Bluetooth and test code, state of bluetooth is "Unknown".
Then I run code, device open settings, toggle button has color green (turn on bluetooth), but when I check state of Bluetooth in code, State of Bluetooth is "Unknown", is not "Power on".
I'm using Xamarin 3.3 and test on device iOS version 12.0.
xamarin xamarin.forms xamarin.ios ios-bluetooth
edited Nov 19 '18 at 15:37
Ahmed Ashour
3,530102442
asked Nov 19 '18 at 15:35
Huu Bao Nguyen
21112
On iOS, I only can check state of Bluetooth. I'm find the solutions on network and use it.
public class CallBluetoothIphoneService : ICallBlueTooth
{
public void LaunchBluetoothOnPhone()
{
try
{
// Is bluetooth enabled?
var bluetoothManager = new CBCentralManager();
if (bluetoothManager.State == CBCentralManagerState.PoweredOff|| bluetoothManager.State == CBCentralManagerState.Unknown)
// Does not go directly to bluetooth on every OS version though, but opens the Settings on most
UIApplication.SharedApplication.OpenUrl(new NSUrl("App-Prefs:root=Bluetooth"));
}
catch (Exception ex)
{
Console.WriteLine(ex);
throw;
}
}
}
But when I try turn off Bluetooth and test code, state of bluetooth is "Unknown".
Then I run code, device open settings, toggle button has color green (turn on bluetooth), but when I check state of Bluetooth in code, State of Bluetooth is "Unknown", is not "Power on".
I'm using Xamarin 3.3 and test on device iOS version 12.0.
xamarin xamarin.forms xamarin.ios ios-bluetooth
xamarin xamarin.forms xamarin.ios ios-bluetooth
edited Nov 19 '18 at 15:37
Ahmed Ashour
3,530102442
asked Nov 19 '18 at 15:35
Huu Bao Nguyen
21112
edited Nov 19 '18 at 15:37
Ahmed Ashour
3,530102442
asked Nov 19 '18 at 15:35
Huu Bao Nguyen
21112
edited Nov 19 '18 at 15:37
Ahmed Ashour
3,530102442
edited Nov 19 '18 at 15:37
Ahmed Ashour
3,530102442
edited Nov 19 '18 at 15:37
Ahmed Ashour
3,530102442
3,530102442
asked Nov 19 '18 at 15:35
Huu Bao Nguyen
21112
asked Nov 19 '18 at 15:35
Huu Bao Nguyen
21112
asked Nov 19 '18 at 15:35
Huu Bao Nguyen
21112
21112
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
I am not sure exactly what you want to do, but if your intent is to open the Bluetooth settings page, this:
UIApplication.SharedApplication.OpenUrl(new NSUrl("App-Prefs:root=Bluetooth"));
won't work. Apple has at some points allowed this (iOS 8 IIRC) and at other points it has disallowed this (most versions of iOS). See this long SO thread about this issue: How to open Settings programmatically like in Facebook app?
Regardless, there is no need. When iOS detects that your app has created a CBCentralManager type with delegate, iOS will display an alert to the user that allows them to go to the bluetooth settings to enable bluetooth by tapping the "Settings" button in the alert.
As far as always getting state as "Unknown", you need to check the state in the delegate for the CBCentralManager. You cannot use the parameterless CBCentralManager constructor new CBCentralManager();. Check the apple docs: https://developer.apple.com/documentation/corebluetooth/cbcentralmanager?language=objc and note that there are only two listed init methods, one that takes delegate and queue parameters, and one that takes delegate, queue, and options parameters, although no one complains if you use the parameterless constructor... but you will never get the correct state if you use it. See: https://stackoverflow.com/a/36824770/2913599
So try this:
public class CallBluetoothIphoneService : ICallBluetooth
{
public void LaunchBluetoothOnPhone()
{
try
{
// Is bluetooth enabled?
var bluetoothManager = new CBCentralManager(new MySimpleCBCentralManagerDelegate(), DispatchQueue.CurrentQueue);
// This will always show state "Unknown". You need to check it in the delegate's UpdatedState method
Console.WriteLine($"State: {bluetoothManager.State.ToString()}");
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
public class MySimpleCBCentralManagerDelegate : CBCentralManagerDelegate
{
override public void UpdatedState(CBCentralManager mgr)
{
// You can check the state in this delegate method
Console.WriteLine($"UpdatedState: {mgr.State.ToString()}");
if (mgr.State == CBCentralManagerState.PoweredOn)
{
//Passing in null scans for all peripherals. Peripherals can be targeted by using CBUIIDs
CBUUID cbuuids = null;
mgr.ScanForPeripherals(cbuuids); //Initiates async calls of DiscoveredPeripheral
//Timeout after 30 seconds
var timer = new Timer(30 * 1000);
timer.Elapsed += (sender, e) => mgr.StopScan();
}
else
{
//Invalid state -- Bluetooth powered down, unavailable, etc.
System.Console.WriteLine("Bluetooth is not available");
}
}
public override void DiscoveredPeripheral(CBCentralManager central, CBPeripheral peripheral, NSDictionary advertisementData, NSNumber RSSI)
{
Console.WriteLine("Discovered {0}, data {1}, RSSI {2}", peripheral.Name, advertisementData, RSSI);
}
}
Bottom line: always create a CBCentralManager object with one of the following constructors:
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue)
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue, CBCentralInitOptions)
answered Nov 19 '18 at 22:06
jgoldberger - MSFT
3,4081827
add a comment |
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1 Answer
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1 Answer
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I am not sure exactly what you want to do, but if your intent is to open the Bluetooth settings page, this:
UIApplication.SharedApplication.OpenUrl(new NSUrl("App-Prefs:root=Bluetooth"));
won't work. Apple has at some points allowed this (iOS 8 IIRC) and at other points it has disallowed this (most versions of iOS). See this long SO thread about this issue: How to open Settings programmatically like in Facebook app?
Regardless, there is no need. When iOS detects that your app has created a CBCentralManager type with delegate, iOS will display an alert to the user that allows them to go to the bluetooth settings to enable bluetooth by tapping the "Settings" button in the alert.
As far as always getting state as "Unknown", you need to check the state in the delegate for the CBCentralManager. You cannot use the parameterless CBCentralManager constructor new CBCentralManager();. Check the apple docs: https://developer.apple.com/documentation/corebluetooth/cbcentralmanager?language=objc and note that there are only two listed init methods, one that takes delegate and queue parameters, and one that takes delegate, queue, and options parameters, although no one complains if you use the parameterless constructor... but you will never get the correct state if you use it. See: https://stackoverflow.com/a/36824770/2913599
So try this:
public class CallBluetoothIphoneService : ICallBluetooth
{
public void LaunchBluetoothOnPhone()
{
try
{
// Is bluetooth enabled?
var bluetoothManager = new CBCentralManager(new MySimpleCBCentralManagerDelegate(), DispatchQueue.CurrentQueue);
// This will always show state "Unknown". You need to check it in the delegate's UpdatedState method
Console.WriteLine($"State: {bluetoothManager.State.ToString()}");
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
public class MySimpleCBCentralManagerDelegate : CBCentralManagerDelegate
{
override public void UpdatedState(CBCentralManager mgr)
{
// You can check the state in this delegate method
Console.WriteLine($"UpdatedState: {mgr.State.ToString()}");
if (mgr.State == CBCentralManagerState.PoweredOn)
{
//Passing in null scans for all peripherals. Peripherals can be targeted by using CBUIIDs
CBUUID cbuuids = null;
mgr.ScanForPeripherals(cbuuids); //Initiates async calls of DiscoveredPeripheral
//Timeout after 30 seconds
var timer = new Timer(30 * 1000);
timer.Elapsed += (sender, e) => mgr.StopScan();
}
else
{
//Invalid state -- Bluetooth powered down, unavailable, etc.
System.Console.WriteLine("Bluetooth is not available");
}
}
public override void DiscoveredPeripheral(CBCentralManager central, CBPeripheral peripheral, NSDictionary advertisementData, NSNumber RSSI)
{
Console.WriteLine("Discovered {0}, data {1}, RSSI {2}", peripheral.Name, advertisementData, RSSI);
}
}
Bottom line: always create a CBCentralManager object with one of the following constructors:
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue)
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue, CBCentralInitOptions)
answered Nov 19 '18 at 22:06
jgoldberger - MSFT
3,4081827
add a comment |
I am not sure exactly what you want to do, but if your intent is to open the Bluetooth settings page, this:
UIApplication.SharedApplication.OpenUrl(new NSUrl("App-Prefs:root=Bluetooth"));
won't work. Apple has at some points allowed this (iOS 8 IIRC) and at other points it has disallowed this (most versions of iOS). See this long SO thread about this issue: How to open Settings programmatically like in Facebook app?
Regardless, there is no need. When iOS detects that your app has created a CBCentralManager type with delegate, iOS will display an alert to the user that allows them to go to the bluetooth settings to enable bluetooth by tapping the "Settings" button in the alert.
As far as always getting state as "Unknown", you need to check the state in the delegate for the CBCentralManager. You cannot use the parameterless CBCentralManager constructor new CBCentralManager();. Check the apple docs: https://developer.apple.com/documentation/corebluetooth/cbcentralmanager?language=objc and note that there are only two listed init methods, one that takes delegate and queue parameters, and one that takes delegate, queue, and options parameters, although no one complains if you use the parameterless constructor... but you will never get the correct state if you use it. See: https://stackoverflow.com/a/36824770/2913599
So try this:
public class CallBluetoothIphoneService : ICallBluetooth
{
public void LaunchBluetoothOnPhone()
{
try
{
// Is bluetooth enabled?
var bluetoothManager = new CBCentralManager(new MySimpleCBCentralManagerDelegate(), DispatchQueue.CurrentQueue);
// This will always show state "Unknown". You need to check it in the delegate's UpdatedState method
Console.WriteLine($"State: {bluetoothManager.State.ToString()}");
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
public class MySimpleCBCentralManagerDelegate : CBCentralManagerDelegate
{
override public void UpdatedState(CBCentralManager mgr)
{
// You can check the state in this delegate method
Console.WriteLine($"UpdatedState: {mgr.State.ToString()}");
if (mgr.State == CBCentralManagerState.PoweredOn)
{
//Passing in null scans for all peripherals. Peripherals can be targeted by using CBUIIDs
CBUUID cbuuids = null;
mgr.ScanForPeripherals(cbuuids); //Initiates async calls of DiscoveredPeripheral
//Timeout after 30 seconds
var timer = new Timer(30 * 1000);
timer.Elapsed += (sender, e) => mgr.StopScan();
}
else
{
//Invalid state -- Bluetooth powered down, unavailable, etc.
System.Console.WriteLine("Bluetooth is not available");
}
}
public override void DiscoveredPeripheral(CBCentralManager central, CBPeripheral peripheral, NSDictionary advertisementData, NSNumber RSSI)
{
Console.WriteLine("Discovered {0}, data {1}, RSSI {2}", peripheral.Name, advertisementData, RSSI);
}
}
Bottom line: always create a CBCentralManager object with one of the following constructors:
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue)
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue, CBCentralInitOptions)
answered Nov 19 '18 at 22:06
jgoldberger - MSFT
3,4081827
add a comment |
I am not sure exactly what you want to do, but if your intent is to open the Bluetooth settings page, this:
UIApplication.SharedApplication.OpenUrl(new NSUrl("App-Prefs:root=Bluetooth"));
won't work. Apple has at some points allowed this (iOS 8 IIRC) and at other points it has disallowed this (most versions of iOS). See this long SO thread about this issue: How to open Settings programmatically like in Facebook app?
Regardless, there is no need. When iOS detects that your app has created a CBCentralManager type with delegate, iOS will display an alert to the user that allows them to go to the bluetooth settings to enable bluetooth by tapping the "Settings" button in the alert.
As far as always getting state as "Unknown", you need to check the state in the delegate for the CBCentralManager. You cannot use the parameterless CBCentralManager constructor new CBCentralManager();. Check the apple docs: https://developer.apple.com/documentation/corebluetooth/cbcentralmanager?language=objc and note that there are only two listed init methods, one that takes delegate and queue parameters, and one that takes delegate, queue, and options parameters, although no one complains if you use the parameterless constructor... but you will never get the correct state if you use it. See: https://stackoverflow.com/a/36824770/2913599
So try this:
public class CallBluetoothIphoneService : ICallBluetooth
{
public void LaunchBluetoothOnPhone()
{
try
{
// Is bluetooth enabled?
var bluetoothManager = new CBCentralManager(new MySimpleCBCentralManagerDelegate(), DispatchQueue.CurrentQueue);
// This will always show state "Unknown". You need to check it in the delegate's UpdatedState method
Console.WriteLine($"State: {bluetoothManager.State.ToString()}");
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
public class MySimpleCBCentralManagerDelegate : CBCentralManagerDelegate
{
override public void UpdatedState(CBCentralManager mgr)
{
// You can check the state in this delegate method
Console.WriteLine($"UpdatedState: {mgr.State.ToString()}");
if (mgr.State == CBCentralManagerState.PoweredOn)
{
//Passing in null scans for all peripherals. Peripherals can be targeted by using CBUIIDs
CBUUID cbuuids = null;
mgr.ScanForPeripherals(cbuuids); //Initiates async calls of DiscoveredPeripheral
//Timeout after 30 seconds
var timer = new Timer(30 * 1000);
timer.Elapsed += (sender, e) => mgr.StopScan();
}
else
{
//Invalid state -- Bluetooth powered down, unavailable, etc.
System.Console.WriteLine("Bluetooth is not available");
}
}
public override void DiscoveredPeripheral(CBCentralManager central, CBPeripheral peripheral, NSDictionary advertisementData, NSNumber RSSI)
{
Console.WriteLine("Discovered {0}, data {1}, RSSI {2}", peripheral.Name, advertisementData, RSSI);
}
}
Bottom line: always create a CBCentralManager object with one of the following constructors:
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue)
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue, CBCentralInitOptions)
answered Nov 19 '18 at 22:06
jgoldberger - MSFT
3,4081827
I am not sure exactly what you want to do, but if your intent is to open the Bluetooth settings page, this:
UIApplication.SharedApplication.OpenUrl(new NSUrl("App-Prefs:root=Bluetooth"));
won't work. Apple has at some points allowed this (iOS 8 IIRC) and at other points it has disallowed this (most versions of iOS). See this long SO thread about this issue: How to open Settings programmatically like in Facebook app?
Regardless, there is no need. When iOS detects that your app has created a CBCentralManager type with delegate, iOS will display an alert to the user that allows them to go to the bluetooth settings to enable bluetooth by tapping the "Settings" button in the alert.
As far as always getting state as "Unknown", you need to check the state in the delegate for the CBCentralManager. You cannot use the parameterless CBCentralManager constructor new CBCentralManager();. Check the apple docs: https://developer.apple.com/documentation/corebluetooth/cbcentralmanager?language=objc and note that there are only two listed init methods, one that takes delegate and queue parameters, and one that takes delegate, queue, and options parameters, although no one complains if you use the parameterless constructor... but you will never get the correct state if you use it. See: https://stackoverflow.com/a/36824770/2913599
So try this:
public class CallBluetoothIphoneService : ICallBluetooth
{
public void LaunchBluetoothOnPhone()
{
try
{
// Is bluetooth enabled?
var bluetoothManager = new CBCentralManager(new MySimpleCBCentralManagerDelegate(), DispatchQueue.CurrentQueue);
// This will always show state "Unknown". You need to check it in the delegate's UpdatedState method
Console.WriteLine($"State: {bluetoothManager.State.ToString()}");
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
public class MySimpleCBCentralManagerDelegate : CBCentralManagerDelegate
{
override public void UpdatedState(CBCentralManager mgr)
{
// You can check the state in this delegate method
Console.WriteLine($"UpdatedState: {mgr.State.ToString()}");
if (mgr.State == CBCentralManagerState.PoweredOn)
{
//Passing in null scans for all peripherals. Peripherals can be targeted by using CBUIIDs
CBUUID cbuuids = null;
mgr.ScanForPeripherals(cbuuids); //Initiates async calls of DiscoveredPeripheral
//Timeout after 30 seconds
var timer = new Timer(30 * 1000);
timer.Elapsed += (sender, e) => mgr.StopScan();
}
else
{
//Invalid state -- Bluetooth powered down, unavailable, etc.
System.Console.WriteLine("Bluetooth is not available");
}
}
public override void DiscoveredPeripheral(CBCentralManager central, CBPeripheral peripheral, NSDictionary advertisementData, NSNumber RSSI)
{
Console.WriteLine("Discovered {0}, data {1}, RSSI {2}", peripheral.Name, advertisementData, RSSI);
}
}
Bottom line: always create a CBCentralManager object with one of the following constructors:
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue)
CBCentralManager(ICBCentralManagerDelegate, DispatchQueue, CBCentralInitOptions)
answered Nov 19 '18 at 22:06
jgoldberger - MSFT
3,4081827
answered Nov 19 '18 at 22:06
jgoldberger - MSFT
3,4081827
answered Nov 19 '18 at 22:06
jgoldberger - MSFT
3,4081827
answered Nov 19 '18 at 22:06
jgoldberger - MSFT
3,4081827
3,4081827
add a comment |
add a comment |
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