java - 设置通知后，书写特征不起作用

在stackoverflow上修改此article和answer后，我编写了以下BluetoothGattCallback：

private BluetoothGattCallback bluetoothGattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(final BluetoothGatt gatt, final int status, final int newState) {
        if (status == GATT_SUCCESS) {
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                // We successfully connected, proceed with service discovery
                Log.i(TAG, "We successfully connected, proceed with service discovery");
                stopScan();
                gatt.discoverServices();

            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                // We successfully disconnected on our own request
                Log.i(TAG, "We successfully disconnected on our own request");
                gatt.close();
            } else {

            }
        } else {
            // An error happened...
            gatt.close();
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        Log.i(TAG, "We are onServiceDiscovered");
        BluetoothGattCharacteristic characteristic =
                gatt.getService(Beacon.BEACON_SERVICE_UUID)
                        .getCharacteristic(Beacon.BEACON_CHAR_UUID);

        BluetoothGattDescriptor descriptor =
                characteristic.getDescriptor(convertFromInteger(0x2902));

        descriptor.setValue(
                BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);


        gatt.writeDescriptor(descriptor);

        gatt.setCharacteristicNotification(characteristic, true);

        writeCharacteristic();
    }

    @Override
    public void onDescriptorWrite(BluetoothGatt gatt, final BluetoothGattDescriptor descriptor, int status) {
        Log.i(TAG, "onWrite");

    }

    @Override
    public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
        Log.i(TAG, "We are onCharacteristicChanged");
        dev_data_hendler.sendMessage(Message.obtain(dev_data_hendler, 0, characteristic.getValue()));
    }
};

其中writeCharacteristic为：

private void writeCharacteristic() {

    class writeTask implements Runnable {
        byte [] bytes;
        writeTask(byte[] to_write){bytes = to_write;}

        public void run() {
            if (gatt == null) {
                Log.e(TAG, "lost connection");
            }

            if (gatt.getService(Beacon.BEACON_SERVICE_UUID) == null) {
                Log.e(TAG, "service not found!");
            }

            if (gatt.getService(Beacon.BEACON_SERVICE_UUID).getCharacteristic(Beacon.BEACON_CHAR_UUID) == null) {
                Log.e(TAG, "char not found!");
            }
            BluetoothGattCharacteristic characteristic = gatt.getService(Beacon.BEACON_SERVICE_UUID).getCharacteristic(Beacon.BEACON_CHAR_UUID);

            characteristic.setWriteType(WRITE_TYPE_DEFAULT);
            characteristic.setValue(bytes);
            if (gatt.writeCharacteristic(characteristic)) {
                Log.i(TAG, "Char written" + flag);
                flag++;
            } else {
                Log.e(TAG, "Char writing failure");
            }
        }
    }
    Thread t = new Thread(new writeTask(new byte[] {(byte)0x05, (byte)0x01}));
    t.start();
    try {
        t.sleep(150);
    } catch (InterruptedException e) {
        Log.i(TAG, "interrupted exception");
    }

}

而gatt.writeCharacteristic（characteristic）返回false。编写和设置通知可以很好地工作，但要分开进行。如果我先写特征，writeCharacteristic返回true，但是我的设备对此没有反应。它只能分开工作

最佳答案

在Android上，您需要等待写入/读取完成，然后才能进行下一个写入/读取。所以你需要排队写/读...