Android BLE App 只能订阅 1 个 BLE 设备的特性通知

问题描述

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：

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

2. 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,"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,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! ");
    }
   

   };

解决方法

 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);