Android 如何使用 PriorityQueue 读取多个 BLE 特征

Question

有点卡在这里，可能需要你的帮助。我想一次读取多个 BLE 特性，有些人建议为此使用 PriorityQueue。我已经知道所有的 uuid 等。只需要一种方法来一次读取多个。谁能解释一下它到底应该是什么样子？或者也许还有另一种更简单的解决方案？

提前致谢，这是我的代码：

public static final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {

    PriorityQueue<BluetoothGattCharacteristic> queue = new PriorityQueue<BluetoothGattCharacteristic>();

    // When connection state changes
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            Log.v(TAG, "Connected!");
            gatt.discoverServices();
        }
        if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            Log.v(TAG, "Disconnected...");

        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {

        List<BluetoothGattService> services = gatt.getServices();
        BluetoothGattService rightService = null;

        for (int i = 0; i < services.size(); i++) {
            if (services.get(i).getCharacteristics().size() > 8) {
                rightService = services.get(i);
            }
        }

        List<UUID> uuidsList;

        UUID TRANSMISSION_POWER = rightService.getCharacteristics().get(4).getUuid();
        UUID BROADCASTING_INTERVAL = rightService.getCharacteristics().get(6).getUuid();
        UUID BEACON_NAME = rightService.getCharacteristics().get(8).getUuid();
        UUID CONNECTION_MODE = rightService.getCharacteristics().get(9).getUuid();
        //UUID SOFT_REBOOT = rightService.getCharacteristics().get(10).getUuid();

        uuidsList = new ArrayList<UUID>();

        uuidsList.add(TRANSMISSION_POWER);
        uuidsList.add(BROADCASTING_INTERVAL);
        uuidsList.add(BEACON_NAME);
        uuidsList.add(CONNECTION_MODE);
        //uuidsList.add(SOFT_REBOOT);

        queue.add(rightService.getCharacteristic(uuidsList.get(0)));
        queue.add(rightService.getCharacteristic(uuidsList.get(1)));
        queue.add(rightService.getCharacteristic(uuidsList.get(2)));

    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {

        Log.v(TAG, "CHARACTERISTIC VALUE___: " + characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0));
        onServicesDiscovered(gatt, 0);

    }

};

更新：

即使将它们放在不同的线程上，它仍然只对一个 gatt.readCharacteristic(...) 做出反应。如下所示：

// Gatt Callback
public static final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {

    // When connection state changes
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            Log.v(TAG, "Connected!");
            gatt.discoverServices();
        }
        if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            Log.v(TAG, "Disconnected...");

        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {


        List<BluetoothGattService> services = gatt.getServices();

        /*
        DISPLAY ALL SERVICES AND CHARACTERISTICS

        for (int i = 0; i < services.size(); i++) {
            Log.v(TAG, "SERVICE____: " + services.get(i).getUuid());

            for (int k = 0; k < services.get(i).getCharacteristics().size(); k++) {
                Log.v(TAG, "CHARACTERISTIC____: " + services.get(i).getCharacteristics().get(k).getUuid());
            }

        }
        */

        BluetoothGattService rightService = null;

        for (int i = 0; i < services.size(); i++) {
            if (services.get(i).getCharacteristics().size() > 8) {
                rightService = services.get(i);
            }
        }

        List<UUID> uuidsList;

        UUID TRANSMISSION_POWER = rightService.getCharacteristics().get(4).getUuid();
        UUID BROADCASTING_INTERVAL = rightService.getCharacteristics().get(6).getUuid();
        UUID BEACON_NAME = rightService.getCharacteristics().get(8).getUuid();
        UUID CONNECTION_MODE = rightService.getCharacteristics().get(9).getUuid();
        //UUID SOFT_REBOOT = rightService.getCharacteristics().get(10).getUuid();

        uuidsList = new ArrayList<UUID>();

        uuidsList.add(TRANSMISSION_POWER);
        uuidsList.add(BROADCASTING_INTERVAL);
        uuidsList.add(BEACON_NAME);
        uuidsList.add(CONNECTION_MODE);
        //uuidsList.add(SOFT_REBOOT);


        class powerThread extends Thread{

            UUID uuid;
            BluetoothGatt gatt;
            BluetoothGattService service;
            public powerThread(UUID uuid, BluetoothGatt gatt, BluetoothGattService service) {
                this.gatt = gatt;
                this.service = service;
                this.uuid = uuid;
            }
            @Override
            public void run() {
                gatt.readCharacteristic(service.getCharacteristic(uuid));
            }
        }
        powerThread pt = new powerThread(TRANSMISSION_POWER, gatt, rightService);
        pt.run();


        class intervalThread extends Thread{

            UUID uuid;
            BluetoothGatt gatt;
            BluetoothGattService service;
            public intervalThread(UUID uuid, BluetoothGatt gatt, BluetoothGattService service) {
                this.gatt = gatt;
                this.service = service;
                this.uuid = uuid;
            }
            @Override
            public void run() {
                gatt.readCharacteristic(service.getCharacteristic(uuid));
            }
        }
        intervalThread it = new intervalThread(BROADCASTING_INTERVAL, gatt, rightService);
        it.run();


    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {

        Log.v(TAG, "CHARACTERISTIC VALUE___: " + characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0));

    }

};

Answer 1

对于可能遇到相同问题的任何人，这里有一个使用特性列表<>的简单解决方案。

public static final BluetoothGattCallback readGattCallback = new BluetoothGattCallback() {

    List<BluetoothGattCharacteristic> chars = new ArrayList<>();

    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {

        if (newState == BluetoothProfile.STATE_CONNECTED) {
            Log.v(TAG, "Connected!");
            broadcastingInterval = 999;
            transmissionPower = 999;
            gatt.discoverServices();
        }
        if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            Log.v(TAG, "Disconnected...");

        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {

        List<BluetoothGattService> services = gatt.getServices();
        BluetoothGattService rightService = null;

        for (int i = 0; i < services.size(); i++) {
            if (services.get(i).getCharacteristics().size() > 8) {
                rightService = services.get(i);
            }
        }

        chars.add(rightService.getCharacteristics().get(4));
        chars.add(rightService.getCharacteristics().get(6));

        requestCharacteristics(gatt);

    }

    public void requestCharacteristics(BluetoothGatt gatt) {
        gatt.readCharacteristic(chars.get(chars.size()-1));
    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {

            if (characteristic.getUuid().toString().substring(7, 8).equals("5")) {
                transmissionPower = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0);
                Log.v(TAG, "tPOWER READ");

            } else if (characteristic.getUuid().toString().substring(7,8).equals("7")) {
                broadcastingInterval = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0);
                Log.v(TAG, "INTERVAL READ");
            }

            chars.remove(chars.get(chars.size() - 1));

            if (chars.size() > 0) {
                requestCharacteristics(gatt);
            } else {
                gatt.disconnect();
            }
        }
    }

};

创建特征列表
在 onServicesDiscovered 中用您想要的特征填充列表 read/write
创建一个名为 requestCharacteristics(gatt) 的新方法并将 gatt 对象传递给它。将特征添加到列表后，从 onServicesDiscovered 调用此方法。
在requestCharacteristics()方法中调用gatt.readCharacteristic(chars.get(chars.size()-1));
在 onCharacteristicRead 中检查您的列表大小是否不为零，然后读取您的特征，删除列表的最后一项并再次调用 requestCharacteristic()。
就这些了

Answer 2

非常感谢您的 post，Robert K。我希望我的应用程序能够自行读取所有特征值，并在 ExpandableList 而不是 UUID 中显示特征值。罗伯特 K 的代码对我有用，但我遇到了显示值的偏移。所以我做了一些小改动，想分享一下： 1.

这是我修改onServicesDiscovered和OnCharacteristicRead的方式：

    public List<BluetoothGattCharacteristic> chars = new ArrayList<>();

public void requestCharacteristics(BluetoothGatt gatt) {
        gatt.readCharacteristic(chars.get(chars.size() - 1));
}

@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
    if (status == BluetoothGatt.GATT_SUCCESS) {

        List<BluetoothGattService> services = gatt.getServices();
        for(BluetoothGattService service:services){
            chars.addAll(service.getCharacteristics());
        }
        requestCharacteristics(gatt);
    } else {
        Log.w(TAG, "onServicesDiscovered received: " + status);
    }
}

@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
    if (status == BluetoothGatt.GATT_SUCCESS) {
        chars.remove(chars.get(chars.size() - 1));
        if (chars.size() > 0) {
            requestCharacteristics(gatt);
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
        } else {
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
            broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
        }
    }
}

引入的特性List每次断线后清空
我引入了一个列表来保存特征值和一个整数显示我在哪个索引（每次断开连接后这些都需要清空/设置为零）。我修改了displayData方法，在每个characteristicRead:

public

public List<String> mCharValues = new ArrayList<>();
public int idx_charValues = 0;
private void displayData(String data) {
    if (data != null) { mCharValues.add(0, data); }
    else { mCharValues.add(0, "no Data"); }
}

我希望在发现服务后立即将特征值显示在 ExpandableList 上。 displayGattServices 方法用服务和特征的名称以及 UUID 填充 ExpandableList。

我没有填UUID，而是填mCharValues对应的元素

currentCharaData.put(LIST_NAME, SampleGattAttributes.lookup(uuid, unknownCharaString));
currentCharaData.put(LIST_UUID, mCharValues.get(idx_charValues));
idx_charValues = idx_charValues+1;
gattCharacteristicGroupData.add(currentCharaData);

最后，我把ExpandableListView.OnChildClickListener的内容注释掉了。除了我在这里介绍的内容外，其余代码几乎没有变化。

Android 如何使用 PriorityQueue 读取多个 BLE 特征

Android how to read multiple BLE characteristics with a PriorityQueue

java

android

priority-queue

bluetooth-lowenergy

android-bluetooth