我可以扫描并找出，使用BLE通过蓝牙连接到固件设备。

mBluetoothGatt = mAl.get(pos).connectGatt(mContext, false, mGattCallback);

虽然从Play商店应用可以发现Services和Characteristics固件设备里面，我的Android应用程序无法发现它们，它总是返回空的服务列表中。实际上固件设备已经设置了Services和Characteristics。

我不知道为什么，谁知道是什么原因，请帮助我如何发现Services和Characteristics，

谢谢

Java代码

// Various callback methods defined by the BLE API.

private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {

@Override

public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {

if (newState == BluetoothProfile.STATE_CONNECTED) {

/**

* In case already connected to Pas device

*/

Log.i("", "Connected to GATT server. " + gatt.discoverServices());

// CALL THIS METHOD TO BEGIN DISCOVER SERVICES

gatt.discoverServices();

} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {

/**

* In case disconnected Pas device

*/

Log.i("", "Disconnected from GATT server.");

}

}

@Override

// New services discovered

public void onServicesDiscovered(BluetoothGatt gatt, int status) {

Log.i("", "onServicesDiscovered " + status + " " + gatt.discoverServices()

+ " " + gatt.getServices());

// RETURN : []

Log.i("", "gatt.getServices() " + gatt.getServices());

// RETURN : TRUE

Log.i("", "gatt.getServices() " + gatt.getServices().isEmpty());

// EXCEPTION HAPPEN BCS SIZE = 0

gatt.readCharacteristic(gatt.getServices().get(0).getCharacteristics().get(0));

if (status == BluetoothGatt.GATT_SUCCESS) {

} else {

Log.w("", "onServicesDiscovered received: " + status);

}

}

@Override

// Result of a characteristic read operation

public void onCharacteristicRead(

BluetoothGatt gatt, BluetoothGattCharacteristic characteristic,

int status) {

Log.i("", "onCharacteristicRead " + status + " " + characteristic);

if (status == BluetoothGatt.GATT_SUCCESS) {

}

}

};

// Device scan callback.

private BluetoothAdapter.LeScanCallback mLeScanCallback =

new BluetoothAdapter.LeScanCallback() {

@Override

public void onLeScan(final BluetoothDevice device, int rssi,

byte[] scanRecord) {

getActivity().runOnUiThread(new Runnable() {

@Override

public void run() {

/**

* Should show Scan Pas Devices :

* Add to array list scanned pas devices if it is not exist in list

* before

*/

if (!mAlPasDeviceNames.contains(device.getName())) {

mAlPasDevices.add(device);

mAlPasDeviceNames.add(device.getName());

// set adapter and show on UI

mLv.setAdapter(new PasConnectionAdapter(

getActivity(),

R.layout.simple_list_item_scan_pas_device,

mAlPasDevices));

}

}

});

}

};

logcat的

connect() - device: E2:5A:6B:5A:18:57, auto: false

D/BluetoothGatt: registerApp()

D/BluetoothGatt: registerApp() - UUID=93455863-c385-4563-9197-6592024cc8cc

D/BtGatt.GattService: registerClient() - UUID=93455863-c385-4563-9197-6592024cc8cc

D/BtGatt.GattService: onClientRegistered() - UUID=93455863-c385-4563-9197-6592024cc8cc, clientIf=5

D/BluetoothGatt: onClientRegistered() - status=0 clientIf=5

D/BtGatt.GattService: clientConnect() - address=E2:5A:6B:5A:18:57, isDirect=true

E/BluetoothRemoteDevices: aclStateChangeCallback: Device is NULL

D/BtGatt.GattService: onConnected() - clientIf=5, connId=5, address=E2:5A:6B:5A:18:57

D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=5 device=E2:5A:6B:5A:18:57

D/BluetoothGatt: discoverServices() - device: E2:5A:6B:5A:18:57

D/BtGatt.GattService: discoverServices() - address=E2:5A:6B:5A:18:57, connId=5

I/: Connected to GATT server. true

D/BluetoothGatt: discoverServices() - device: E2:5A:6B:5A:18:57

D/BtGatt.GattService: discoverServices() - address=E2:5A:6B:5A:18:57, connId=5

D/BtGatt.GattService: onSearchCompleted() - connId=5, status=0

D/BtGatt.GattService: onSearchCompleted() - connId=5, status=0

E/BtGatt.btif: bta_to_btif_uuid: Unknown UUID length 61618!

E/BtGatt.btif: bta_to_btif_uuid: Unknown UUID length 61619!

I/: gatt.getService(uuid) null

D/BluetoothGatt: onSearchComplete() = Device=E2:5A:6B:5A:18:57 Status=0

D/BluetoothGatt: discoverServices() - device: E2:5A:6B:5A:18:57

D/BtGatt.GattService: discoverServices() - address=E2:5A:6B:5A:18:57, connId=5

D/BtGatt.GattService: onSearchCompleted() - connId=5, status=0

I/: onServicesDiscovered 0 true []

I/: gatt.getServices() []

I/: gatt.getServices() true

E/BtGatt.btif: bta_to_btif_uuid: Unknown UUID length 61621!

W/BluetoothGatt: Unhandled exception in callback

W/BluetoothGatt: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0

W/BluetoothGatt: at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)

W/BluetoothGatt: at java.util.ArrayList.get(ArrayList.java:308)

W/BluetoothGatt: at ui.fragment.PasConnectionFragment$1.onServicesDiscovered(PasConnectionFragment.java:379)

W/BluetoothGatt: at android.bluetooth.BluetoothGatt$1.onSearchComplete(BluetoothGatt.java:304)

W/BluetoothGatt: at android.bluetooth.IBluetoothGattCallback$Stub.onTransact(IBluetoothGattCallback.java:217)

W/BluetoothGatt: at android.os.Binder.execTransact(Binder.java:446)