我的应用程序列出了Bluetooth LE设备上的服务。它有：
处理gattcallbacks并广播更新的服务（BluetoothLeService.java）
在主要活动中声明的广播接收器
我无法在广播接收器中可靠地从BluetoothGatt获得GATT回调。我有两个我正在测试的设备，它们对于相同的代码会得到不同的结果。运行Android 4.4.2的平板电脑根本没有回调，而运行5.1.1的Nexus 4手机则获得回调并显示服务。
这是我服务中的gatt回调：
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();
gatt.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);
Log.d(TAG, "Services discovered, broadcasting update");
} 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 onCharacteristicChanged(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
Log.d(TAG, "Characteristic changed, broadcasting update");
}
@Override
public void onCharacteristicWrite(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic,
int status) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
Log.d(TAG, "Characteristic written, braodcasting update");
}
};
以下是我在主要活动中的内容：
// Code to manage Service lifecycle.
private final ServiceConnection mServiceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName componentName, IBinder service) {
mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService();
if (!mBluetoothLeService.initialize()) {
Log.e(TAG, "Unable to initialize Bluetooth");
finish();
}
// Automatically connects to the device upon successful start-up initialization.
mBluetoothLeService.connect(mDeviceAddress);
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
Log.d(TAG,"Disconnected from service");
mBluetoothLeService = null;
}
};
// Handles various events fired by the Service.
// ACTION_GATT_CONNECTED: connected to a GATT server.
// ACTION_GATT_DISCONNECTED: disconnected from a GATT server.
// ACTION_GATT_SERVICES_DISCOVERED: discovered GATT services.
// ACTION_DATA_AVAILABLE: received data from the device. This can be a result of read
// or notification operations.
private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
Log.d(TAG,"Received data from broadcast receiver: "+ action);
if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {
mConnected = true;
updateConnectionState(R.string.connected);
invalidateOptionsMenu();
} else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
Log.d(TAG,"Disconnected from the gatt server");
mConnected = false;
updateConnectionState(R.string.disconnected);
invalidateOptionsMenu();
clearUI();
} else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
Log.d(TAG,"Receiver: Action Found");
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// get fresh uuids
device.fetchUuidsWithSdp();
} else if (BluetoothDevice.ACTION_UUID.equals(action)) {
// Get the device and teh uuids
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Parcelable[] uuidExtra = intent.getParcelableArrayExtra(BluetoothDevice.EXTRA_UUID);
if (uuidExtra != null) {
for (Parcelable uuid : uuidExtra) {
Log.d(TAG, "Device: " + device.getName() + " ( " + device.getAddress() + " ) - Service: " + uuid.toString());
}
}
} else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
// Show all the supported services and characteristics on the user interface.
myDevice.setServices(mBluetoothLeService.getSupportedGattServices());
Log.d(TAG,"Services for "+ myDevice.getName() +" set by broadcast receiver");
displayGattServices(mBluetoothLeService.getSupportedGattServices());
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
displayData(intent.getStringExtra(BluetoothLeService.EXTRA_DATA));
Log.d(TAG, "Display Data: " + intent.getStringExtra(BluetoothLeService.EXTRA_DATA));
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_api);
final Intent intent = getIntent();
final Context context = getApplicationContext();
// Initializes a Bluetooth adapter. For API level 18 and above, get a reference to
// BluetoothAdapter through BluetoothManager.
final BluetoothManager bluetoothManager =
(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
//Intent gattServiceIntent = new Intent(context, BluetoothLeService.class);
//context.bindService(gattServiceIntent, mServiceConnection, Context.BIND_AUTO_CREATE);
Intent gattServiceIntent = new Intent(this, BluetoothLeService.class);
bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE);
...
});
最后，当我没有收到回调时会发生一些日志输出
D/BluetoothGatt﹕ connect() - device: 00:07:80:2D:D3:5C, auto: false
D/BluetoothGatt﹕ registerApp()
D/BluetoothGatt﹕ registerApp() - UUID=468b550a-c0e6-4c54-8437-bb83d07f9be8
D/BluetoothGatt﹕ onClientRegistered() - status=0 clientIf=5
D/VXHB﹕ Trying to create a new connection.
D/BluetoothGatt﹕ onClientConnectionState() - status=133 clientIf=5 device=00:07:80:2D:D3:5C
I/VXHB﹕ Connected to GATT server.
I/VXHB﹕ Attempting to start service discovery.
D/BluetoothGatt﹕ discoverServices() - device: 00:07:80:2D:D3:5C
D/VXHB﹕ Received data from broadcast receiver: my.package.name.ACTION_GATT_CONNECTED
正如您从logcat输出中看到的那样，ACTION_GATT_CONNECTED的广播正常工作，发现服务实际上被触发，但我从未收到过回调。
有关如何解决此问题的任何线索？
答案 0 :(得分：0)
尝试在onCreate中注册广播接收器：
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
filter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothDevice.ACTION_UUID);
filter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
filter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
registerReceiver(mGattUpdateReceiver, filter);
答案 1 :(得分：-2)
我的代码中有其他地方导致此操作失灵。恢复了较旧的提交并解决了问题。