Question

我目前正在开发一个项目，开发一个Android应用程序，旨在从腕带获取数据并处理它们以获得类似健康评估的东西。我坚持这个问题，我无法让onCharacteristicRead（）函数工作......它只是不会被调用...

以下是与此部分相关的代码：

private BluetoothGattCallback gattcallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, final int newState) {
        super.onConnectionStateChange(gatt, status, newState);

        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                String status;
                switch (newState) {
                    case BluetoothGatt.STATE_CONNECTED:
                        lianjiezhuangtai.setText("connection succeed");
                        bluetoothAdapter.stopLeScan(callback);
                        bluetoothGatt.discoverServices();
                        break;
                    case BluetoothGatt.STATE_CONNECTING:
                        lianjiezhuangtai.setText("trying to connect");
                        break;
                    case BluetoothGatt.STATE_DISCONNECTED:
                        lianjiezhuangtai.setText("connection lost");
                        break;
                    case BluetoothGatt.STATE_DISCONNECTING:
                        lianjiezhuangtai.setText("disconnecting");
                        break;
                }
                //pd.dismiss();
            }
        });
    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        jibu.setText("run: trying to get steps");
        super.onCharacteristicRead(gatt, characteristic, status);

        if (status == bluetoothGatt.GATT_SUCCESS) {
            final int sum = 100;//characteristic.getValue()[0];

            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    jibu.setText("walked" + sum + "steps");
                }
            });

            Log.e(TAG, "onCharacteristicRead: " + characteristic.getValue()[0]);

        }

    }        
    @Override
    public void onServicesDiscovered(final BluetoothGatt gatt,final int status) {
        super.onServicesDiscovered(gatt, status);
        Log.i(TAG, "run: trying to get steps");
        if (status == bluetoothGatt.GATT_SUCCESS) {
            final List<BluetoothGattService> services = bluetoothGatt.getServices();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    //List<String> serlist = new ArrayList<>();
                    for (final BluetoothGattService bluetoothGattService : services) {
                        bluetoothGattServices = bluetoothGattService;

                        Log.i(TAG, "onServicesDiscovered: " + bluetoothGattService.getUuid());

                        List<BluetoothGattCharacteristic> charc = bluetoothGattService.getCharacteristics();

                        for (BluetoothGattCharacteristic charac : charc) {
                            Log.i(TAG, "run: " + charac.getUuid());
                            // 00002a06-0000-1000-8000-00805f9b34fb 
                    //        bluetoothGatt.setCharacteristicNotification(characteristic_zd,true);
                            if (charac.getUuid().toString().equals("0000ff06-0000-1000-8000-00805f9b34fb")) {
                                characteristic_zd = charac;

                            } else if (charac.getUuid().toString().equals("00002a06-0000-1000-8000-00805f9b34fb")) {

                                characteristic_jb = charac;

                               // bluetoothGatt.setCharacteristicNotification(characteristic_jb,true);
                                bluetoothGatt.readCharacteristic(characteristic_jb);
                                //sum = charac.getValue()[0];
                                gattcallback.onCharacteristicRead(gatt, characteristic_jb, status);
                                Log.i(TAG, "run: trying to get steps");
                            } else if (charac.getUuid().toString().equals("")) {
                            }
                        }


                        serviceslist.add(bluetoothGattService.getUuid().toString());

                    }
//                        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
//                                MainActivity.this, android.R.layout.simple_expandable_list_item_1, serviceslist);
                    //list.setAdapter(adapter);
                }
            });
        }

    }



    @Override
    public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        super.onCharacteristicWrite(gatt, characteristic, status);
    }


    @Override
    public void onCharacteristicChanged(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic) {
        super.onCharacteristicChanged(gatt, characteristic);



    }

};

那么有人可以帮我解决这个问题吗？一直在寻找解决方案但仍然无法解决这个问题...非常感谢

Answer 1

三件事：

您不需要在每次回调中调用super.method（）。
您不应该自己调用onCharacteristicRead，一旦在调用readCharacteristic方法后检索到读取响应，蓝牙堆栈就会执行此操作。
如果有多个特征，您的代码将无法正常工作，因为Android的GATT api一次只能有一个未完成的操作。这意味着您需要等待onCharacteristicRead回调才能执行另一个readCharacteristic。（如果打印readCharacteristic的返回值，您将看到它第一次打印为true，但以下时间为false。）

android ble无法调用onCharacteristicRead（）

1 个答案: