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Enables background usage of flutter-blue #210

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Enables background usage of flutter-blue #210

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24 changes: 18 additions & 6 deletions android/src/main/java/com/pauldemarco/flutterblue/FlutterBluePlugin.java
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -91,7 +91,7 @@ public static void registerWith(Registrar registrar) {
this.servicesDiscoveredChannel = new EventChannel(registrar.messenger(), NAMESPACE+"/servicesDiscovered");
this.characteristicReadChannel = new EventChannel(registrar.messenger(), NAMESPACE+"/characteristicRead");
this.descriptorReadChannel = new EventChannel(registrar.messenger(), NAMESPACE+"/descriptorRead");
this.mBluetoothManager = (BluetoothManager) r.activity().getSystemService(Context.BLUETOOTH_SERVICE);
this.mBluetoothManager = (BluetoothManager) r.context().getSystemService(Context.BLUETOOTH_SERVICE);
this.mBluetoothAdapter = mBluetoothManager.getAdapter();
channel.setMethodCallHandler(this);
stateChannel.setStreamHandler(stateHandler);
Expand All @@ -116,7 +116,13 @@ public void onMethodCall(MethodCall call, Result result) {
result.success(null);
break;
}


case "setUniqueId":
{
result.success(null);
break;
}

case "state":
{
Protos.BluetoothState.Builder p = Protos.BluetoothState.newBuilder();
Expand Down Expand Up @@ -159,8 +165,14 @@ public void onMethodCall(MethodCall call, Result result) {

case "startScan":
{
if (ContextCompat.checkSelfPermission(registrar.activity(), Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
boolean hasPermssions = (ContextCompat.checkSelfPermission(registrar.context(), Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED);

if (registrar.activity() == null && !hasPermssions) {
result.error("scan_error","bluetooth is not enabled",hasPermssions);
break;
}

if (!hasPermssions) {
ActivityCompat.requestPermissions(
registrar.activity(),
new String[] {
Expand Down Expand Up @@ -579,13 +591,13 @@ public void onReceive(Context context, Intent intent) {
public void onListen(Object o, EventChannel.EventSink eventSink) {
sink = eventSink;
IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registrar.activity().registerReceiver(mReceiver, filter);
registrar.context().registerReceiver(mReceiver, filter);
}

@Override
public void onCancel(Object o) {
sink = null;
registrar.activity().unregisterReceiver(mReceiver);
registrar.context().unregisterReceiver(mReceiver);
}
};

Expand Down
35 changes: 27 additions & 8 deletions ios/Classes/FlutterBluePlugin.m
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ @interface FlutterBluePlugin ()
@property(nonatomic) NSMutableArray *servicesThatNeedDiscovered;
@property(nonatomic) NSMutableArray *characteristicsThatNeedDiscovered;
@property(nonatomic) LogLevel logLevel;
@property(nonatomic) NSString *uniqueId;
@end

@implementation FlutterBluePlugin
Expand All @@ -56,7 +57,6 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
FlutterEventChannel* descriptorReadChannel = [FlutterEventChannel eventChannelWithName:NAMESPACE @"/descriptorRead" binaryMessenger:[registrar messenger]];
FlutterBluePlugin* instance = [[FlutterBluePlugin alloc] init];
instance.channel = channel;
instance.centralManager = [[CBCentralManager alloc] initWithDelegate:instance queue:nil];
instance.scannedPeripherals = [NSMutableDictionary new];
instance.servicesThatNeedDiscovered = [NSMutableArray new];
instance.characteristicsThatNeedDiscovered = [NSMutableArray new];
Expand Down Expand Up @@ -90,13 +90,28 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
[registrar addMethodCallDelegate:instance channel:channel];
}

- (CBCentralManager*)centralManager{
if (!_centralManager){
_centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil
options:_uniqueId ? @{CBCentralManagerOptionRestoreIdentifierKey: _uniqueId} : @{}];
}
return _centralManager;
}

- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
if ([@"setLogLevel" isEqualToString:call.method]) {
NSNumber *logLevelIndex = [call arguments];
_logLevel = (LogLevel)[logLevelIndex integerValue];
result(nil);
} else if([@"setUniqueId" isEqualToString:call.method]) {
_uniqueId = [call arguments];
if (!_centralManager){
result(@(YES));
} else {
result(@(NO));
}
} else if ([@"state" isEqualToString:call.method]) {
FlutterStandardTypedData *data = [self toFlutterData:[self toBluetoothStateProto:self->_centralManager.state]];
FlutterStandardTypedData *data = [self toFlutterData:[self toBluetoothStateProto:self.centralManager.state]];
result(data);
} else if([@"isAvailable" isEqualToString:call.method]) {
if(self.centralManager.state != CBManagerStateUnsupported && self.centralManager.state != CBManagerStateUnknown) {
Expand All @@ -123,10 +138,10 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
uuids = [uuids arrayByAddingObject:[CBUUID UUIDWithString:u]];
}
// TODO: iOS Scan Options (#35)
[self->_centralManager scanForPeripheralsWithServices:uuids options:nil];
[self.centralManager scanForPeripheralsWithServices:uuids options:nil];
result(nil);
} else if([@"stopScan" isEqualToString:call.method]) {
[self->_centralManager stopScan];
[self.centralManager stopScan];
result(nil);
} else if([@"connect" isEqualToString:call.method]) {
FlutterStandardTypedData *data = [call arguments];
Expand All @@ -140,7 +155,7 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
details:nil];
}
// TODO: Implement Connect options (#36)
[_centralManager connectPeripheral:peripheral options:nil];
[self.centralManager connectPeripheral:peripheral options:nil];
result(nil);
} @catch(FlutterError *e) {
result(e);
Expand All @@ -149,7 +164,7 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
NSString *remoteId = [call arguments];
@try {
CBPeripheral *peripheral = [self findPeripheral:remoteId];
[_centralManager cancelPeripheralConnection:peripheral];
[self.centralManager cancelPeripheralConnection:peripheral];
result(nil);
} @catch(FlutterError *e) {
result(e);
Expand Down Expand Up @@ -268,7 +283,7 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
}

- (CBPeripheral*)findPeripheral:(NSString*)remoteId {
NSArray<CBPeripheral*> *peripherals = [_centralManager retrievePeripheralsWithIdentifiers:@[[[NSUUID alloc] initWithUUIDString:remoteId]]];
NSArray<CBPeripheral*> *peripherals = [self.centralManager retrievePeripheralsWithIdentifiers:@[[[NSUUID alloc] initWithUUIDString:remoteId]]];
CBPeripheral *peripheral;
for(CBPeripheral *p in peripherals) {
if([[p.identifier UUIDString] isEqualToString:remoteId]) {
Expand Down Expand Up @@ -371,11 +386,15 @@ - (CBDescriptor*)getDescriptorFromArray:(NSString*)uuidString array:(NSArray<CBD
//
- (void)centralManagerDidUpdateState:(nonnull CBCentralManager *)central {
if(_stateStreamHandler.sink != nil) {
FlutterStandardTypedData *data = [self toFlutterData:[self toBluetoothStateProto:self->_centralManager.state]];
FlutterStandardTypedData *data = [self toFlutterData:[self toBluetoothStateProto:self.centralManager.state]];
self.stateStreamHandler.sink(data);
}
}

- (void)centralManager:(CBCentralManager *)central willRestoreState:(NSDictionary<NSString *, id> *)dict {
}


- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI {
[self.scannedPeripherals setObject:peripheral
forKey:[[peripheral identifier] UUIDString]];
Expand Down
4 changes: 4 additions & 0 deletions lib/src/flutter_blue.dart
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,10 @@ class FlutterBlue {
.map((s) => BluetoothState.values[s.state.value]);
}

/// Sets a unique id (required on iOS for restoring app on background-scan)
/// should be called before any other methods.
Future setUniqueId(String uniqueid) => _channel.invokeMethod('setUniqueId',uniqueid.toString());

/// Starts a scan for Bluetooth Low Energy devices
/// Timeout closes the stream after a specified [Duration]
Stream<ScanResult> scan({
Expand Down