Question

我是 Android 新手。我正在尝试从 2 个 BLE 设备订阅特征通知。现在，我的应用程序只能从第一个设备接收 BLE 数据。我知道 BLE 是串行通信，所以我必须等到 onDescriptorWrite() 回调被调用，然后才能为第二个设备启用通知。我们每次只能有 1 个 GATT 操作。 我的问题是：

如何修改onDescriptorWrite()？ Thread.sleep() 延迟方法没有帮助。

有些人提到使用队列来添加/删除某些东西？

 public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled,int device) {
 if (mBluetoothAdapter == null || mBluetoothGatt == null || mBluetoothGatt1 == null) {
     Log.e(TAG, "BluetoothAdapter not initialized");
     return;
 }
 if(device == 0) {
     mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
     BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
     descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
     mBluetoothGatt.writeDescriptor(descriptor);
     try {
         Thread.sleep(100);
     } catch (InterruptedException e) {
         e.printStackTrace();
     }
     Log.e(TAG,"Device #0 is done for notification!");
 }
 else if(device == 1){
     mBluetoothGatt1.setCharacteristicNotification(characteristic,enabled);
     BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
     descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
     mBluetoothGatt.writeDescriptor(descriptor);
     try {
         Thread.sleep(100);
     } catch (InterruptedException e) {
         e.printStackTrace();
     }
     Log.e(TAG,"Device #1 is done for notification!");
 }

}

 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.e(TAG, "Connected to GATT server #0.");
         // Attempts to discover services after successful connection.
         Log.e(TAG, "Attempting to start service discovery #0:" + mBluetoothGatt.discoverServices());

     } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
         intentAction = ACTION_GATT_DISCONNECTED;
         mConnectionState = STATE_DISCONNECTED;
         Log.e(TAG, "Disconnected from GATT server #0.");
         broadcastUpdate(intentAction);
     }
 }

 @Override
 public void onServicesDiscovered(BluetoothGatt gatt, int status) {
     if (status == BluetoothGatt.GATT_SUCCESS) {
         broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
     } else {
         Log.e(TAG, "onServicesDiscovered received: " + status);
     }
 }

 @Override
 public void onCharacteristicRead(BluetoothGatt gatt,
                                  BluetoothGattCharacteristic characteristic,
                                  int status) {
     if (status == BluetoothGatt.GATT_SUCCESS) {
         broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic,0);
     }
     try {
         Thread.sleep(700);
     }catch(InterruptedException ex) {
         Thread.currentThread().interrupt();
     }
     Log.e(TAG,"onCHAR READ");
 }

 @Override
 public void onCharacteristicChanged(BluetoothGatt gatt,
                                     BluetoothGattCharacteristic characteristic) {
     broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic,0);
     try {
         Thread.sleep(700);
     }catch(InterruptedException ex) {
         Thread.currentThread().interrupt();
     }
     Log.e(TAG,"onCharacteristicChanged #0 = ACTION_DATA_AVAILABLE, Done! ");
 }

 @Override
 public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
     super.onDescriptorWrite(gatt, descriptor, status);

     // Do something here ????????????

     // Thread.sleep() delay method doesn't help
     try {
         Thread.sleep(700);
     }catch(InterruptedException ex) {
         Thread.currentThread().interrupt();
     }
     Log.e(TAG,"onDescriptorWrite #0, Done! ");
 }

};

Answer 1

 mBluetoothGatt1.setCharacteristicNotification(characteristic,enabled);
 BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
 descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
 mBluetoothGatt.writeDescriptor(descriptor);

我认为应该是：

 mBluetoothGatt1.setCharacteristicNotification(characteristic,enabled);
 BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
 descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
 mBluetoothGatt1.writeDescriptor(descriptor);

Android BLE App 只能订阅 1 个 BLE 设备的特性通知

1 个答案: