Flutter源码-蓝牙操作插件

Obtain an instance

FlutterBlue flutterBlue = FlutterBlue.instance;

Scan for devices

// Start scanning
flutterBlue.startScan(timeout: Duration(seconds: 4));
// Listen to scan results
var subscription = flutterBlue.scanResults.listen((results) {
    // do something with scan results
    for (ScanResult r in results) {
        print('${r.device.name} found! rssi: ${r.rssi}');
    }
});
// Stop scanning
flutterBlue.stopScan();

Connect to a device

// Connect to the device
await device.connect();
// Disconnect from device
device.disconnect();

Discover services

List<BluetoothService> services = await device.discoverServices();
services.forEach((service) {
    // do something with service
});

Read and write characteristics

// Reads all characteristics
var characteristics = service.characteristics;
for(BluetoothCharacteristic c in characteristics) {
    List<int> value = await c.read();
    print(value);
}
// Writes to a characteristic
await c.write([0x12, 0x34])

Read and write descriptors

// Reads all descriptors
var descriptors = characteristic.descriptors;
for(BluetoothDescriptor d in descriptors) {
    List<int> value = await d.read();
    print(value);
}
// Writes to a descriptor
await d.write([0x12, 0x34])

Set notifications and listen to changes

await characteristic.setNotifyValue(true);
characteristic.value.listen((value) {
    // do something with new value
});

Read the MTU and request larger size

final mtu = await device.mtu.first;
await device.requestMtu(512);

Note that iOS will not allow requests of MTU size, and will always try to negotiate the highest possible MTU (iOS supports up to MTU size 185)

Reference

FlutterBlue API

	Android	iOS	Description
scan			Starts a scan for Bluetooth Low Energy devices.
state			Stream of state changes for the Bluetooth Adapter.
isAvailable			Checks whether the device supports Bluetooth.
isOn			Checks if Bluetooth functionality is turned on.

BluetoothDevice API

	Android	iOS	Description
connect			Establishes a connection to the device.
disconnect			Cancels an active or pending connection to the device.
discoverServices			Discovers services offered by the remote device as well as their characteristics and descriptors.
services			Gets a list of services. Requires that discoverServices() has completed.
state			Stream of state changes for the Bluetooth Device.
mtu			Stream of mtu size changes.
requestMtu			Request to change the MTU for the device.

BluetoothCharacteristic API

	Android	iOS	Description
read			Retrieves the value of the characteristic.
write			Writes the value of the characteristic.
setNotifyValue			Sets notifications or indications on the characteristic.
value			Stream of characteristic’s value when changed.

BluetoothDescriptor API

	Android	iOS	Description
read			Retrieves the value of the descriptor.
write			Writes the value of the descriptor.