某些设备上没有蓝牙 gatt 回调
Posted
技术标签:
【中文标题】某些设备上没有蓝牙 gatt 回调【英文标题】:No Bluetooth gatt callback on some devices 【发布时间】:2015-06-23 21:20:51 【问题描述】:我的应用列出了在蓝牙 LE 设备上找到的服务。它有:
处理 gattcallbacks 和广播更新的服务 (BluetoothLeService.java)
在主要活动中声明的广播接收器
我无法在我的广播接收器中可靠地从 BluetoothGatt 获取 GATT 回调。我有 2 台正在测试的设备,它们对相同的代码得到不同的结果。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 手机得到回调并显示服务。
这是我的服务内部的 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");
;
这是我的主要活动:
// 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 的广播有效,并且发现服务实际上已被触发,但我从未收到回调。
任何线索如何解决这个问题?
【问题讨论】:
【参考方案1】:尝试像这样在 onCreate 中注册您的广播接收器:
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);
【讨论】:
谢谢,我确实有这个,只是没有将它包含在我的代码中(抱歉)。【参考方案2】:我的代码中的其他地方有一些东西导致了这个故障。恢复到较旧的提交并解决了问题。
【讨论】:
标记为解决方案不是很有用。你能解释一下你是怎么解决的吗? 请您在这里指出问题所在?以上是关于某些设备上没有蓝牙 gatt 回调的主要内容,如果未能解决你的问题,请参考以下文章