未从 BLE 设备接收数据
Not receiving data from BLE device
我又来了
所以，长话短说：在我的应用程序中，我正在尝试从我的 BLE 设备（tickr 心率监视器：that) with the help of Android Samples (that）接收数据。
但是...我没有从我的设备接收数据！我能够获得特征和描述符，但是......仅此而已。我只是.. 没抓住要点。
这是我的代码：
private BluetoothLeService mBluetoothLeService;
private ArrayList<BluetoothGattCharacteristic> mGattCharacteristics =
new ArrayList<BluetoothGattCharacteristic>();
private BluetoothGattCharacteristic mNotifyCharacteristic;
public static final String EXTRAS_DEVICE_NAME = "DEVICE_NAME";
public static final String EXTRAS_DEVICE_ADDRESS = "DEVICE_ADDRESS";
private static final int CONNECTED_ID = 1;
private String mDeviceName;
private String mDeviceAddress;
private boolean mConnected = false;
BluetoothGatt btGatt;
BluetoothGattCharacteristic btGattCharacteristic;
private List<BluetoothGattCharacteristic> gattCharacteristics = new ArrayList<BluetoothGattCharacteristic>();
@InjectView(R.id.hrate) public TextView hRate;
private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {
Log.i(TAG, "gatt connected");
mConnected = true;
} else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
mConnected = false;
Log.i(TAG, "gatt disconnected");
hRate.setText("0");
} else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
Log.i(TAG, "service discovered");
returnServices(mBluetoothLeService.getSupportedGattServices());
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
Log.i(TAG, "data available");
displayHR(intent.getExtras().getString(BluetoothLeService.EXTRA_DATA));
}
}
};
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");
onDestroy();
}
// Automatically connects to the device upon successful start-up initialization.
mBluetoothLeService.connect(mDeviceAddress);
Log.i("", "i'm connected");
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
mBluetoothLeService = null;
}
};
@OnClick({R.id.button_start, R.id.button_pause, R.id.button_stop})
public void OnSession(View view) {
switch (view.getId()) {
case R.id.button_start:
if(first) {
first=false;
onBLE();
}
else {
startRun();
if (mBluetoothLeService != null) {
getActivity().registerReceiver(mGattUpdateReceiver, makeGattUpdateIntentFilter());
final boolean result = mBluetoothLeService.connect(mDeviceAddress);
Log.d(TAG, "Connect request result=" + result);
}
}
break;
}
public Dialog onBLE(){
android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(getActivity());
builder.setMessage("Vuoi utilizzare un device?")
.setCancelable(false)
.setPositiveButton("Sì", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent intent = new Intent(getActivity(), BluetoothActivity.class);
startActivityForResult(new Intent(intent), CONNECTED_ID);
dialog.cancel();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
hRate.setText("N.D.");
startRun();
dialog.cancel();
}
});
android.app.AlertDialog ble = builder.create();
ble.show();
return null;
}
public void startRun(){
timeAtStart = SystemClock.uptimeMillis();
customHandler.postDelayed(updated, 0);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CONNECTED_ID){
if (resultCode == Activity.RESULT_OK) {
mDeviceName = data.getExtras().getString(EXTRAS_DEVICE_NAME);
mDeviceAddress = data.getExtras().getString(EXTRAS_DEVICE_ADDRESS);
Log.i("", mDeviceAddress+" "+mDeviceName);
connect();
startRun();
}
}
}
public void connect(){
Intent gattServiceIntent = new Intent(getActivity(), BluetoothLeService.class);
getActivity().bindService(gattServiceIntent, mServiceConnection, getActivity().BIND_AUTO_CREATE);
}
public void displayHR(String arg){
if(arg != null){
hRate.setText(arg);
}
}
private void returnServices(List<BluetoothGattService> gattServices) {
if (gattServices == null) return;
for (BluetoothGattService service : gattServices) {
gattCharacteristics=service.getCharacteristics();
for (BluetoothGattCharacteristic characteristic : service.getCharacteristics()) {
if (characteristic.getUuid().toString().compareTo(SampleGattAttributes.HEART_RATE_MEASUREMENT) == 0)
btGattCharacteristic = characteristic;
}
}
if ((btGattCharacteristic.getProperties() | BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
if (mNotifyCharacteristic != null) {
mBluetoothLeService.setCharacteristicNotification(mNotifyCharacteristic, false);
mNotifyCharacteristic = null;
}
mBluetoothLeService.readCharacteristic(btGattCharacteristic);
}
if ((btGattCharacteristic.getProperties() | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
mNotifyCharacteristic = btGattCharacteristic;
mBluetoothLeService.setCharacteristicNotification(btGattCharacteristic, true);
}
}
private static IntentFilter makeGattUpdateIntentFilter() {
final IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
return intentFilter;
}
这是我的 logcat:
09-25 11:38:05.975 25709-25709/apheniti.prova D/BluetoothAdapter﹕ startLeScan(): null
09-25 11:38:06.092 25709-25709/apheniti.prova D/dalvikvm﹕ GC_FOR_ALLOC freed 235K, 3% free 9444K/9716K, paused 18ms, total 18ms
09-25 11:38:06.147 25709-25722/apheniti.prova D/BluetoothAdapter﹕ onClientRegistered() - status=0 clientIf=4
09-25 11:38:07.194 25709-25722/apheniti.prova D/BluetoothAdapter﹕ onScanResult() - Device=DA:E1:DD:95:BB:D4 RSSI=-61
09-25 11:38:07.842 25709-25709/apheniti.prova D/BluetoothAdapter﹕ stopLeScan()
09-25 11:38:07.921 25709-25709/apheniti.prova I/﹕ DA:E1:DD:95:BB:D4 TICKR
09-25 11:38:08.006 25709-25709/apheniti.prova D/BluetoothGatt﹕ connect() - device: DA:E1:DD:95:BB:D4, auto: false
09-25 11:38:08.006 25709-25709/apheniti.prova D/BluetoothGatt﹕ registerApp()
09-25 11:38:08.006 25709-25709/apheniti.prova D/BluetoothGatt﹕ registerApp() - UUID=e8dfe101-58d1-4c04-bc3b-f1983e19b468
09-25 11:38:08.014 25709-25723/apheniti.prova D/BluetoothGatt﹕ onClientRegistered() - status=0 clientIf=4
09-25 11:38:08.014 25709-25709/apheniti.prova D/BluetoothLeService﹕ Trying to create a new connection.
09-25 11:38:08.014 25709-25709/apheniti.prova I/﹕ i'm connected
09-25 11:38:08.483 25709-25723/apheniti.prova D/BluetoothGatt﹕ onClientConnectionState() - status=0 clientIf=4 device=DA:E1:DD:95:BB:D4
09-25 11:38:08.491 25709-25723/apheniti.prova I/BluetoothLeService﹕ Connected to GATT server.
09-25 11:38:08.491 25709-25723/apheniti.prova D/BluetoothGatt﹕ discoverServices() - device: DA:E1:DD:95:BB:D4
09-25 11:38:08.491 25709-25723/apheniti.prova I/BluetoothLeService﹕ Attempting to start service discovery:true
09-25 11:38:08.491 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=00001800-0000-1000-8000-00805f9b34fb
09-25 11:38:08.499 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=00001801-0000-1000-8000-00805f9b34fb
09-25 11:38:08.499 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=0000180d-0000-1000-8000-00805f9b34fb
09-25 11:38:08.499 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=0000180f-0000-1000-8000-00805f9b34fb
09-25 11:38:08.506 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=0000180a-0000-1000-8000-00805f9b34fb
09-25 11:38:08.506 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=a026ee01-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.506 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=a026ee03-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.506 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a00-0000-1000-8000-00805f9b34fb
09-25 11:38:08.514 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a01-0000-1000-8000-00805f9b34fb
09-25 11:38:08.514 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a04-0000-1000-8000-00805f9b34fb
09-25 11:38:08.530 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a05-0000-1000-8000-00805f9b34fb
09-25 11:38:08.530 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a37-0000-1000-8000-00805f9b34fb
09-25 11:38:08.538 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a38-0000-1000-8000-00805f9b34fb
09-25 11:38:08.546 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a19-0000-1000-8000-00805f9b34fb
09-25 11:38:08.546 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a29-0000-1000-8000-00805f9b34fb
09-25 11:38:08.546 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a27-0000-1000-8000-00805f9b34fb
09-25 11:38:08.553 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a26-0000-1000-8000-00805f9b34fb
09-25 11:38:08.561 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=a026e002-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.561 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=a026e004-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.561 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=a026e00a-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.569 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.569 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.577 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.585 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.585 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.600 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.600 25709-25722/apheniti.prova D/BluetoothGatt﹕ onSearchComplete() = Device=DA:E1:DD:95:BB:D4 Status=0
09-25 11:38:09.624 25709-25709/apheniti.prova D/dalvikvm﹕ GC_FOR_ALLOC freed 441K, 5% free 9514K/9992K, paused 26ms, total 27ms
09-25 11:38:11.944 25709-25709/apheniti.prova D/dalvikvm﹕ GC_FOR_ALLOC freed 485K, 6% free 9542K/10064K, paused 18ms, total 18ms
09-25 11:38:14.772 25709-25709/apheniti.prova D/dalvikvm﹕ GC_FOR_ALLOC freed 490K, 6% free 9566K/10092K, paused 18ms, total 19ms
09-25 11:38:15.991 25709-25709/apheniti.prova D/BluetoothAdapter﹕ stopLeScan()
您有一个 mBluetoothLeService.readCharacteristic(btGattCharacteristic) 调用但没有 onCharacteristicRead(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic, int status) 回调来接收值。它是 BluetoothGattCallback.
的一部分
我对这个过程的理解是，首先你会以某种方式找到 BluetoothDevice——可能是通过 BLE 扫描。你识别它，例如通过它的名称（使用 device.getName()）或通过广告数据并使用 device.connectGatt(context, false/true, gattCallback) 连接到它。
然后在您的回调中您会收到 onConnectionStateChange(BluetoothGatt gatt, int status, int newState) 中的连接状态。如果状态为 BluetoothProfile.STATE_CONNECTED，您可以使用 gatt.discoverServices() 发现服务。这将触发 onServicesDiscovered(BluetoothGatt gatt, int status)，您将在其中通过 gatt.getServices() 获取可用服务并通过其 UUID 识别正确的服务并通过 service.getCharacteristics() 获取其特征并再次通过其 UUID 识别正确的特征。
然后您将使用 gatt.readCharacteristic( service.getCharacteristic(CHARACTERISTIC_UUID)) 读取特征。然后这会触发 onCharacteristicRead(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic, int status) 回调。在这里，您将使用 characteristic.getUuid() 检查您收到的特征（因为事物是异步的），并使用 characteristic.getStringValue(0) 读取其字符串值或使用 getFloatValue(0) 读取其浮点值等，具体取决于数据类型。
由于异步操作链，它可能会造成混淆。然而，NewCircle 在 here and more specifically the client code is in this file. They are related to this excellent video about BLE on Android 中为服务器和客户端提供了很好的示例代码，它也对代码做了一些解释。
您提到的 Android 示例可能有点令人困惑，因为它还涉及 Activity/Service 交互，并且不仅仅与低功耗蓝牙有关。最好看看 NewCircle 视频和示例项目也许...
我又来了
所以，长话短说：在我的应用程序中，我正在尝试从我的 BLE 设备（tickr 心率监视器：that) with the help of Android Samples (that）接收数据。
但是...我没有从我的设备接收数据！我能够获得特征和描述符，但是......仅此而已。我只是.. 没抓住要点。
这是我的代码：
private BluetoothLeService mBluetoothLeService;
private ArrayList<BluetoothGattCharacteristic> mGattCharacteristics =
new ArrayList<BluetoothGattCharacteristic>();
private BluetoothGattCharacteristic mNotifyCharacteristic;
public static final String EXTRAS_DEVICE_NAME = "DEVICE_NAME";
public static final String EXTRAS_DEVICE_ADDRESS = "DEVICE_ADDRESS";
private static final int CONNECTED_ID = 1;
private String mDeviceName;
private String mDeviceAddress;
private boolean mConnected = false;
BluetoothGatt btGatt;
BluetoothGattCharacteristic btGattCharacteristic;
private List<BluetoothGattCharacteristic> gattCharacteristics = new ArrayList<BluetoothGattCharacteristic>();
@InjectView(R.id.hrate) public TextView hRate;
private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {
Log.i(TAG, "gatt connected");
mConnected = true;
} else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
mConnected = false;
Log.i(TAG, "gatt disconnected");
hRate.setText("0");
} else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
Log.i(TAG, "service discovered");
returnServices(mBluetoothLeService.getSupportedGattServices());
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
Log.i(TAG, "data available");
displayHR(intent.getExtras().getString(BluetoothLeService.EXTRA_DATA));
}
}
};
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");
onDestroy();
}
// Automatically connects to the device upon successful start-up initialization.
mBluetoothLeService.connect(mDeviceAddress);
Log.i("", "i'm connected");
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
mBluetoothLeService = null;
}
};
@OnClick({R.id.button_start, R.id.button_pause, R.id.button_stop})
public void OnSession(View view) {
switch (view.getId()) {
case R.id.button_start:
if(first) {
first=false;
onBLE();
}
else {
startRun();
if (mBluetoothLeService != null) {
getActivity().registerReceiver(mGattUpdateReceiver, makeGattUpdateIntentFilter());
final boolean result = mBluetoothLeService.connect(mDeviceAddress);
Log.d(TAG, "Connect request result=" + result);
}
}
break;
}
public Dialog onBLE(){
android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(getActivity());
builder.setMessage("Vuoi utilizzare un device?")
.setCancelable(false)
.setPositiveButton("Sì", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent intent = new Intent(getActivity(), BluetoothActivity.class);
startActivityForResult(new Intent(intent), CONNECTED_ID);
dialog.cancel();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
hRate.setText("N.D.");
startRun();
dialog.cancel();
}
});
android.app.AlertDialog ble = builder.create();
ble.show();
return null;
}
public void startRun(){
timeAtStart = SystemClock.uptimeMillis();
customHandler.postDelayed(updated, 0);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CONNECTED_ID){
if (resultCode == Activity.RESULT_OK) {
mDeviceName = data.getExtras().getString(EXTRAS_DEVICE_NAME);
mDeviceAddress = data.getExtras().getString(EXTRAS_DEVICE_ADDRESS);
Log.i("", mDeviceAddress+" "+mDeviceName);
connect();
startRun();
}
}
}
public void connect(){
Intent gattServiceIntent = new Intent(getActivity(), BluetoothLeService.class);
getActivity().bindService(gattServiceIntent, mServiceConnection, getActivity().BIND_AUTO_CREATE);
}
public void displayHR(String arg){
if(arg != null){
hRate.setText(arg);
}
}
private void returnServices(List<BluetoothGattService> gattServices) {
if (gattServices == null) return;
for (BluetoothGattService service : gattServices) {
gattCharacteristics=service.getCharacteristics();
for (BluetoothGattCharacteristic characteristic : service.getCharacteristics()) {
if (characteristic.getUuid().toString().compareTo(SampleGattAttributes.HEART_RATE_MEASUREMENT) == 0)
btGattCharacteristic = characteristic;
}
}
if ((btGattCharacteristic.getProperties() | BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
if (mNotifyCharacteristic != null) {
mBluetoothLeService.setCharacteristicNotification(mNotifyCharacteristic, false);
mNotifyCharacteristic = null;
}
mBluetoothLeService.readCharacteristic(btGattCharacteristic);
}
if ((btGattCharacteristic.getProperties() | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
mNotifyCharacteristic = btGattCharacteristic;
mBluetoothLeService.setCharacteristicNotification(btGattCharacteristic, true);
}
}
private static IntentFilter makeGattUpdateIntentFilter() {
final IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
return intentFilter;
}
这是我的 logcat:
09-25 11:38:05.975 25709-25709/apheniti.prova D/BluetoothAdapter﹕ startLeScan(): null
09-25 11:38:06.092 25709-25709/apheniti.prova D/dalvikvm﹕ GC_FOR_ALLOC freed 235K, 3% free 9444K/9716K, paused 18ms, total 18ms
09-25 11:38:06.147 25709-25722/apheniti.prova D/BluetoothAdapter﹕ onClientRegistered() - status=0 clientIf=4
09-25 11:38:07.194 25709-25722/apheniti.prova D/BluetoothAdapter﹕ onScanResult() - Device=DA:E1:DD:95:BB:D4 RSSI=-61
09-25 11:38:07.842 25709-25709/apheniti.prova D/BluetoothAdapter﹕ stopLeScan()
09-25 11:38:07.921 25709-25709/apheniti.prova I/﹕ DA:E1:DD:95:BB:D4 TICKR
09-25 11:38:08.006 25709-25709/apheniti.prova D/BluetoothGatt﹕ connect() - device: DA:E1:DD:95:BB:D4, auto: false
09-25 11:38:08.006 25709-25709/apheniti.prova D/BluetoothGatt﹕ registerApp()
09-25 11:38:08.006 25709-25709/apheniti.prova D/BluetoothGatt﹕ registerApp() - UUID=e8dfe101-58d1-4c04-bc3b-f1983e19b468
09-25 11:38:08.014 25709-25723/apheniti.prova D/BluetoothGatt﹕ onClientRegistered() - status=0 clientIf=4
09-25 11:38:08.014 25709-25709/apheniti.prova D/BluetoothLeService﹕ Trying to create a new connection.
09-25 11:38:08.014 25709-25709/apheniti.prova I/﹕ i'm connected
09-25 11:38:08.483 25709-25723/apheniti.prova D/BluetoothGatt﹕ onClientConnectionState() - status=0 clientIf=4 device=DA:E1:DD:95:BB:D4
09-25 11:38:08.491 25709-25723/apheniti.prova I/BluetoothLeService﹕ Connected to GATT server.
09-25 11:38:08.491 25709-25723/apheniti.prova D/BluetoothGatt﹕ discoverServices() - device: DA:E1:DD:95:BB:D4
09-25 11:38:08.491 25709-25723/apheniti.prova I/BluetoothLeService﹕ Attempting to start service discovery:true
09-25 11:38:08.491 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=00001800-0000-1000-8000-00805f9b34fb
09-25 11:38:08.499 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=00001801-0000-1000-8000-00805f9b34fb
09-25 11:38:08.499 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=0000180d-0000-1000-8000-00805f9b34fb
09-25 11:38:08.499 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=0000180f-0000-1000-8000-00805f9b34fb
09-25 11:38:08.506 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=0000180a-0000-1000-8000-00805f9b34fb
09-25 11:38:08.506 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=a026ee01-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.506 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetService() - Device=DA:E1:DD:95:BB:D4 UUID=a026ee03-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.506 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a00-0000-1000-8000-00805f9b34fb
09-25 11:38:08.514 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a01-0000-1000-8000-00805f9b34fb
09-25 11:38:08.514 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a04-0000-1000-8000-00805f9b34fb
09-25 11:38:08.530 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a05-0000-1000-8000-00805f9b34fb
09-25 11:38:08.530 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a37-0000-1000-8000-00805f9b34fb
09-25 11:38:08.538 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a38-0000-1000-8000-00805f9b34fb
09-25 11:38:08.546 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a19-0000-1000-8000-00805f9b34fb
09-25 11:38:08.546 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a29-0000-1000-8000-00805f9b34fb
09-25 11:38:08.546 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a27-0000-1000-8000-00805f9b34fb
09-25 11:38:08.553 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=00002a26-0000-1000-8000-00805f9b34fb
09-25 11:38:08.561 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=a026e002-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.561 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=a026e004-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.561 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetCharacteristic() - Device=DA:E1:DD:95:BB:D4 UUID=a026e00a-0a7d-4ab3-97fa-f1500f9feb8b
09-25 11:38:08.569 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.569 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.577 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.585 25709-25722/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.585 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.600 25709-25723/apheniti.prova D/BluetoothGatt﹕ onGetDescriptor() - Device=DA:E1:DD:95:BB:D4 UUID=00002902-0000-1000-8000-00805f9b34fb
09-25 11:38:08.600 25709-25722/apheniti.prova D/BluetoothGatt﹕ onSearchComplete() = Device=DA:E1:DD:95:BB:D4 Status=0
09-25 11:38:09.624 25709-25709/apheniti.prova D/dalvikvm﹕ GC_FOR_ALLOC freed 441K, 5% free 9514K/9992K, paused 26ms, total 27ms
09-25 11:38:11.944 25709-25709/apheniti.prova D/dalvikvm﹕ GC_FOR_ALLOC freed 485K, 6% free 9542K/10064K, paused 18ms, total 18ms
09-25 11:38:14.772 25709-25709/apheniti.prova D/dalvikvm﹕ GC_FOR_ALLOC freed 490K, 6% free 9566K/10092K, paused 18ms, total 19ms
09-25 11:38:15.991 25709-25709/apheniti.prova D/BluetoothAdapter﹕ stopLeScan()
您有一个 mBluetoothLeService.readCharacteristic(btGattCharacteristic) 调用但没有 onCharacteristicRead(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic, int status) 回调来接收值。它是 BluetoothGattCallback.
我对这个过程的理解是，首先你会以某种方式找到 BluetoothDevice——可能是通过 BLE 扫描。你识别它，例如通过它的名称（使用 device.getName()）或通过广告数据并使用 device.connectGatt(context, false/true, gattCallback) 连接到它。
然后在您的回调中您会收到 onConnectionStateChange(BluetoothGatt gatt, int status, int newState) 中的连接状态。如果状态为 BluetoothProfile.STATE_CONNECTED，您可以使用 gatt.discoverServices() 发现服务。这将触发 onServicesDiscovered(BluetoothGatt gatt, int status)，您将在其中通过 gatt.getServices() 获取可用服务并通过其 UUID 识别正确的服务并通过 service.getCharacteristics() 获取其特征并再次通过其 UUID 识别正确的特征。
然后您将使用 gatt.readCharacteristic( service.getCharacteristic(CHARACTERISTIC_UUID)) 读取特征。然后这会触发 onCharacteristicRead(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic, int status) 回调。在这里，您将使用 characteristic.getUuid() 检查您收到的特征（因为事物是异步的），并使用 characteristic.getStringValue(0) 读取其字符串值或使用 getFloatValue(0) 读取其浮点值等，具体取决于数据类型。
由于异步操作链，它可能会造成混淆。然而，NewCircle 在 here and more specifically the client code is in this file. They are related to this excellent video about BLE on Android 中为服务器和客户端提供了很好的示例代码，它也对代码做了一些解释。
您提到的 Android 示例可能有点令人困惑，因为它还涉及 Activity/Service 交互，并且不仅仅与低功耗蓝牙有关。最好看看 NewCircle 视频和示例项目也许...