我正在编写一些代码来获取 TI Keyfob(cc2540) 加速器数据。应该启用 3 个 CharacteristicNotifications。我一个一个设置并启用了BluetoothGattDescriptor，但是代码运行后，只有第一个BluetoothGattDescriptor可以发送通知。
我的设备是带有 Android 4.3 的三星 S3。
这是我的 BluetoothService.java 中的一些代码：
static final byte[] DISABLE = {0x00};
static final byte[] ENABLE = {0x01};
public void enableKeyfobAccelService(boolean enable) {
BluetoothGattService _service = mBluetoothGatt.getService(UUID_KEYFOB_ACCEL_SERVICE);
if (_service == null) {
Log.d(TAG, "Keyfob Accel service not found!");
return;
}
Log.d(TAG, "Keyfob Accel service found!");
// write value to Characteristic ACCEL_ENABLER "0000ffa1-0000-1000-8000-00805f9b34fb"
BluetoothGattCharacteristic _nc = _service.getCharacteristic(UUID_KEYFOB_ACCEL_ENABLER);
if (_nc != null) {
if (enable)
_nc.setValue(ENABLE);
else
_nc.setValue(DISABLE);
mBluetoothGatt.writeCharacteristic(_nc);
}
accel_enabled = enable;
}
// Implements callback methods for GATT events that the app cares about. For
// example,
// connection change and services discovered.
private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status,
int newState) {
String intentAction;
if (newState == BluetoothProfile.STATE_CONNECTED) {
intentAction = ACTION_GATT_CONNECTED;
mConnectionState = STATE_CONNECTED;
broadcastUpdate(intentAction);
Log.i(TAG, "Connected to GATT server.");
// Attempts to discover services after successful connection.
Log.i(TAG, "Attempting to start service discovery:"
+ mBluetoothGatt.discoverServices());
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
intentAction = ACTION_GATT_DISCONNECTED;
mConnectionState = STATE_DISCONNECTED;
Log.i(TAG, "Disconnected from GATT server.");
broadcastUpdate(intentAction);
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
} else {
Log.w(TAG, "onServicesDiscovered received: " + status);
}
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
}
}
@Override
public void onCharacteristicWrite(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
Log.v(TAG, "onCharacteristicWrite value : " + byteArrayToHex(characteristic.getValue()));
if (UUID_KEYFOB_ACCEL_ENABLER.equals(characteristic.getUuid())) {
BluetoothGattCharacteristic _nc = characteristic.getService().getCharacteristic(UUID_KEYFOB_ACCEL_X);
if( _nc != null ) {
setCharacteristicNotification(_nc, accel_enabled);
Log.d(TAG, "Keyfob Accel X ready! " + accel_enabled);
}
else {
Log.d(TAG, "Keyfob Accel UUID_KEYFOB_ACCEL_X is null! ");
}
_nc = characteristic.getService().getCharacteristic(UUID_KEYFOB_ACCEL_Y);
if( _nc != null ) {
setCharacteristicNotification(_nc, accel_enabled);
Log.d(TAG, "Keyfob Accel Y ready! " + accel_enabled);
}
else {
Log.d(TAG, "Keyfob Accel UUID_KEYFOB_ACCEL_Y is null! ");
}
_nc = characteristic.getService().getCharacteristic(UUID_KEYFOB_ACCEL_Z);
if( _nc != null ) {
setCharacteristicNotification(_nc, accel_enabled);
Log.d(TAG, "Keyfob Accel Z ready! " + accel_enabled);
}
else {
Log.d(TAG, "Keyfob Accel UUID_KEYFOB_ACCEL_Z is null! ");
}
}
}
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
}
};
public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) {
if (mBluetoothAdapter == null || mBluetoothGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
if (characteristic == null) {
Log.w(TAG, "Bluetooth characteristic not initialized");
return;
}
boolean success = mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
Log.v(TAG, "setCharacteristicNotification = " + success);
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
if (descriptor != null) {
byte[] val = enabled ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE : BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE;
descriptor.setValue(val);
mBluetoothGatt.writeDescriptor(descriptor);
}
}
在启用 UUID_KEYFOB_ACCEL_ENABLER 后，我可以阅读日志以了解所有三个 mBluetoothGatt.writeDescriptor(descriptor) 都已运行。但是 onCharacteristicChanged() 只能从 UUID_KEYFOB_ACCEL_X 中获取更改的值。
这很奇怪，请寻求您的帮助。
非常感谢。