安卓蓝牙获取心率测量

Question

我想获取“A&D UA-651BLE”设备的 HRM 值。这是该设备的数据表中用于获取 HRM 值的内容:

1. Set the application to pairing mode to start scanning.
2. Start pairing of A&D BLE device following each instruction manual.
3. At pairing mode, the application should set time and date and any other device settings to A&D BLE device. After successful pairing, A&D BLE device shows “End” on the screen.
4. Take a measurement and finish the measurement, then A&D BLE device start BLE connection with advertising. The application starts scanning with suitable interval so that the application catches the advertising of A&D BLE device as soon as it can.
5. At initial connection or pairing, the Application set “2” to CCCD (Client Characteristic Configuration Descriptor) so that A&D BLE device sends a measurement data with Indication.
6. After A&D device recognizes to be set “2” to CCCD and to be synchronized time and date within 5 seconds after connected, send the data with Indication.
7. If the timeout set CCCD and time and date is expired, A&D BLE device will not send data and store the data in memory. The stored data in A&D BLE device can send next successful connection.

这是我的服务代码:

public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }

        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        // This is specific to Heart Rate Measurement.
        if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {
            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
                    UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(descriptor);
        }
    }

这是读取数据的方法:

final byte[] data = characteristic.getValue();
            if (data != null && data.length > 0) {
                final StringBuilder stringBuilder = new StringBuilder(data.length);
                for(byte byteChar : data)
                    stringBuilder.append(String.format("%02X ", byteChar));
                Log.e("HRM value",stringBuilder.toString());
                dataComposition.put(characteristic.getUuid().toString(),stringBuilder.toString());
                intent.putExtra(EXTRA_DATA,dataComposition);
            }

问题是这段代码没有返回任何数据!!

Answer 1

有一个 Android Open Source Project example正是这样做的，最简单的选择是克隆 android-BluetoothLeGatt code ，构建并将其与您自己的进行比较。如果您无法发现差异/问题，只需部署这两个应用程序并逐步执行两组代码。拥有一些已知的工作代码也有助于排除 HRM 无法正常运行的可能性。