34

I am having trouble using startLeScan( new UUID[]{ MY_DESIRED_128_BIT_SERVICE_UUID }, callback ) on the new introduced BLE API of Android 4.3 on my Nexus 4.

The callback just doesn't get called. I still can see incoming packages in the log:

08-02 15:48:57.985: I/bt-hci(1051): btu_ble_process_adv_pkt
08-02 15:48:58.636: I/bt-hci(1051): BLE HCI(id=62) event = 0x02)

If I don't use the parameter to filter for UUIDs it works. We are using a manufacturer specific 128bit UUID for device of our company.

Now, our device offers more services than I am providing in the array. But that shouldn't be the problem.

Is anyone facing the same problem? Any solutions?

Edit

There are several problems related to scanning, this question only discusses one: If you also have some issue with scanning, read this comment first. Also keep in mind, that my device imposes a 16bit and a 128bit UUID. Most of you guys use 16bit UUIDs provided by the BLE standard like Heart rate or Speed and Cadence.

4

11 回答 11

40

@Navin 的代码很好，但它包含原始 16 位 Android 代码的溢出错误。（如果任一字节大于 127，则它变为负整数。）

这是一个修复该错误并添加 128 位支持的实现：

private List<UUID> parseUuids(byte[] advertisedData) {
     List<UUID> uuids = new ArrayList<UUID>();

     ByteBuffer buffer = ByteBuffer.wrap(advertisedData).order(ByteOrder.LITTLE_ENDIAN);
     while (buffer.remaining() > 2) {
         byte length = buffer.get();
         if (length == 0) break;

         byte type = buffer.get();
         switch (type) {
             case 0x02: // Partial list of 16-bit UUIDs
             case 0x03: // Complete list of 16-bit UUIDs
                 while (length >= 2) {
                     uuids.add(UUID.fromString(String.format(
                             "%08x-0000-1000-8000-00805f9b34fb", buffer.getShort())));
                     length -= 2;
                 }
                 break;

             case 0x06: // Partial list of 128-bit UUIDs
             case 0x07: // Complete list of 128-bit UUIDs
                 while (length >= 16) {
                     long lsb = buffer.getLong();
                     long msb = buffer.getLong();
                     uuids.add(new UUID(msb, lsb));
                     length -= 16;
                 }
                 break;

             default:
                 buffer.position(buffer.position() + length - 1);
                 break;
         }
     }

     return uuids;
 }
于 2014-07-02T19:42:16.957 回答
22

试试这个从广告的 128 位 UUID 中检索/过滤设备：

private List<UUID> parseUUIDs(final byte[] advertisedData) {
    List<UUID> uuids = new ArrayList<UUID>();

    int offset = 0;
    while (offset < (advertisedData.length - 2)) {
        int len = advertisedData[offset++];
        if (len == 0)
            break;

        int type = advertisedData[offset++];
        switch (type) {
        case 0x02: // Partial list of 16-bit UUIDs
        case 0x03: // Complete list of 16-bit UUIDs
            while (len > 1) {
                int uuid16 = advertisedData[offset++];
                uuid16 += (advertisedData[offset++] << 8);
                len -= 2;
                uuids.add(UUID.fromString(String.format(
                        "%08x-0000-1000-8000-00805f9b34fb", uuid16)));
            }
            break;
        case 0x06:// Partial list of 128-bit UUIDs
        case 0x07:// Complete list of 128-bit UUIDs
            // Loop through the advertised 128-bit UUID's.
            while (len >= 16) {
                try {
                    // Wrap the advertised bits and order them.
                    ByteBuffer buffer = ByteBuffer.wrap(advertisedData,
                            offset++, 16).order(ByteOrder.LITTLE_ENDIAN);
                    long mostSignificantBit = buffer.getLong();
                    long leastSignificantBit = buffer.getLong();
                    uuids.add(new UUID(leastSignificantBit,
                            mostSignificantBit));
                } catch (IndexOutOfBoundsException e) {
                    // Defensive programming.
                    Log.e(LOG_TAG, e.toString());
                    continue;
                } finally {
                    // Move the offset to read the next uuid.
                    offset += 15;
                    len -= 16;
                }
            }
            break;
        default:
            offset += (len - 1);
            break;
        }
    }

    return uuids;
}
于 2014-02-24T11:30:07.123 回答
11

这是至少在 Android 4.3 JWR66Y 中报告的错误：

  • 如果我提供 16 位 UUID，则过滤有效
  • 如果我提供 128 位 UUID 或同时提供两个 UUID，过滤不会返回任何扫描结果

我的设置：我的设备提供 2 个用于广告的 UUID（1 个 16 位和 1 个 128 位）和 4 个用于服务发现的 UUID（1 个 128 位和 3 个 16 位）。

即使它得到修复，我也警告大家不要使用 Android 提供的过滤器选项。为了向后兼容并且因为它在带有 Android 4.3 的三星 Galaxy S3 上被破坏了

于 2013-09-19T15:47:06.993 回答
6

尽管 4.3 似乎不支持按 128 位 UUID 进行过滤，但这些 UUID 很可能存在于 LeScanCallback 返回的 byte[] scanRecord 中。

解析这些数据可能有一种正确的方法，但如果每次都获得相同的数据，则可以通过查找要查找的 UUID 的偏移量来手动过滤结果。您可以通过将扫描数据打印到日志（作为十六进制字符串）并查找您感兴趣的 UUID 来执行此操作（它们可能会跟随 0x06 或 0x07 并且将被反转）。找到偏移量后，设置基本过滤器应该不会太难。

这是一个按单个 UUID 过滤的简单示例（使用Apache Commons Lang用于 ArrayUtils 和在此处找到的 bytes-to-hex 方法，但您可以在必要时替换您自己的代码）

public static boolean hasMyService(byte[] scanRecord) {

    // UUID we want to filter by (without hyphens)
    final String myServiceID = "0000000000001000800000805F9B34FB";

    // The offset in the scan record. In my case the offset was 13; it will probably be different for you
    final int serviceOffset = 13; 

    try{

        // Get a 16-byte array of what may or may not be the service we're filtering for
        byte[] service = ArrayUtils.subarray(scanRecord, serviceOffset, serviceOffset + 16);

        // The bytes are probably in reverse order, so we need to fix that
        ArrayUtils.reverse(service);

        // Get the hex string
        String discoveredServiceID = bytesToHex(service);

        // Compare against our service
        return myServiceID.equals(discoveredServiceID);

    } catch (Exception e){
        return false;
    }

}
于 2013-09-27T21:46:44.530 回答
2

您确定外设在广告数据或扫描响应数据中列出了指定的服务 UUID？

于 2013-08-07T16:48:03.267 回答
2

从扫描结果中列出服务 UUID 的最佳方法是从位于android.bluetooth.le包内的ScanRecord.java中准确复制parseFromBytes方法（确保您拥有最新的 Android SDK），将返回更改为ParcelUuid的列表，因为这是我们唯一关心的事情

    private static final int DATA_TYPE_FLAGS = 0x01;
    private static final int DATA_TYPE_SERVICE_UUIDS_16_BIT_PARTIAL = 0x02;
    private static final int DATA_TYPE_SERVICE_UUIDS_16_BIT_COMPLETE = 0x03;
    private static final int DATA_TYPE_SERVICE_UUIDS_32_BIT_PARTIAL = 0x04;
    private static final int DATA_TYPE_SERVICE_UUIDS_32_BIT_COMPLETE = 0x05;
    private static final int DATA_TYPE_SERVICE_UUIDS_128_BIT_PARTIAL = 0x06;
    private static final int DATA_TYPE_SERVICE_UUIDS_128_BIT_COMPLETE = 0x07;
    private static final int DATA_TYPE_LOCAL_NAME_SHORT = 0x08;
    private static final int DATA_TYPE_LOCAL_NAME_COMPLETE = 0x09;
    private static final int DATA_TYPE_TX_POWER_LEVEL = 0x0A;
    private static final int DATA_TYPE_SERVICE_DATA = 0x16;
    private static final int DATA_TYPE_MANUFACTURER_SPECIFIC_DATA = 0xFF;

    public static List<ParcelUuid> parseFromBytes(byte[] scanRecord) {
        if (scanRecord == null) {
            return null;
        }

        int currentPos = 0;
        int advertiseFlag = -1;
        List<ParcelUuid> serviceUuids = new ArrayList<ParcelUuid>();
        String localName = null;
        int txPowerLevel = Integer.MIN_VALUE;

        SparseArray<byte[]> manufacturerData = new SparseArray<byte[]>();
        Map<ParcelUuid, byte[]> serviceData = new HashMap<ParcelUuid, byte[]>();

        try {
            while (currentPos < scanRecord.length) {
                // length is unsigned int.
                int length = scanRecord[currentPos++] & 0xFF;
                if (length == 0) {
                    break;
                }
                // Note the length includes the length of the field type itself.
                int dataLength = length - 1;
                // fieldType is unsigned int.
                int fieldType = scanRecord[currentPos++] & 0xFF;
                switch (fieldType) {
                    case DATA_TYPE_FLAGS:
                        advertiseFlag = scanRecord[currentPos] & 0xFF;
                        break;
                    case DATA_TYPE_SERVICE_UUIDS_16_BIT_PARTIAL:
                    case DATA_TYPE_SERVICE_UUIDS_16_BIT_COMPLETE:
                        parseServiceUuid(scanRecord, currentPos,
                                dataLength, 2, serviceUuids);
                        break;
                    case DATA_TYPE_SERVICE_UUIDS_32_BIT_PARTIAL:
                    case DATA_TYPE_SERVICE_UUIDS_32_BIT_COMPLETE:
                        parseServiceUuid(scanRecord, currentPos, dataLength,
                                BluetoothUuid.UUID_BYTES_32_BIT, serviceUuids);
                        break;
                    case DATA_TYPE_SERVICE_UUIDS_128_BIT_PARTIAL:
                    case DATA_TYPE_SERVICE_UUIDS_128_BIT_COMPLETE:
                        parseServiceUuid(scanRecord, currentPos, dataLength,
                                BluetoothUuid.UUID_BYTES_128_BIT, serviceUuids);
                        break;
                    case DATA_TYPE_LOCAL_NAME_SHORT:
                    case DATA_TYPE_LOCAL_NAME_COMPLETE:
                        localName = new String(
                                extractBytes(scanRecord, currentPos, dataLength));
                        break;
                    case DATA_TYPE_TX_POWER_LEVEL:
                        txPowerLevel = scanRecord[currentPos];
                        break;
                    case DATA_TYPE_SERVICE_DATA:
                        // The first two bytes of the service data are service data UUID in little
                        // endian. The rest bytes are service data.
                        int serviceUuidLength = BluetoothUuid.UUID_BYTES_16_BIT;
                        byte[] serviceDataUuidBytes = extractBytes(scanRecord, currentPos,
                                serviceUuidLength);
                        ParcelUuid serviceDataUuid = BluetoothUuid.parseUuidFrom(
                                serviceDataUuidBytes);
                        byte[] serviceDataArray = extractBytes(scanRecord,
                                currentPos + serviceUuidLength, dataLength - serviceUuidLength);
                        serviceData.put(serviceDataUuid, serviceDataArray);
                        break;
                    case DATA_TYPE_MANUFACTURER_SPECIFIC_DATA:
                        // The first two bytes of the manufacturer specific data are
                        // manufacturer ids in little endian.
                        int manufacturerId = ((scanRecord[currentPos + 1] & 0xFF) << 8) +
                                (scanRecord[currentPos] & 0xFF);
                        byte[] manufacturerDataBytes = extractBytes(scanRecord, currentPos + 2,
                                dataLength - 2);
                        manufacturerData.put(manufacturerId, manufacturerDataBytes);
                        break;
                    default:
                        // Just ignore, we don't handle such data type.
                        break;
                }
                currentPos += dataLength;
            }

            if (serviceUuids.isEmpty()) {
                serviceUuids = null;
            }

//            Log.i("SERVICE UUIDS", parcelUuidToString(serviceUuids));
        } catch (Exception e) {
            Log.e(TAG, "unable to parse scan record: " + Arrays.toString(scanRecord));
            // As the record is invalid, ignore all the parsed results for this packet
            // and return an empty record with raw scanRecord bytes in results
        }

        return serviceUuids;
    }

您还需要从同一个包中导入BluetoothUuid.java ：

import java.util.UUID;
import android.os.ParcelUuid;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import java.util.HashSet;
/**
 * Static helper methods and constants to decode the ParcelUuid of remote devices.
 *  @hide
 */
public final class BluetoothUuid {
    /* See Bluetooth Assigned Numbers document - SDP section, to get the values of UUIDs
     * for the various services.
     *
     * The following 128 bit values are calculated as:
     *  uuid * 2^96 + BASE_UUID
     */
    public static final ParcelUuid AudioSink =
            ParcelUuid.fromString("0000110B-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid AudioSource =
            ParcelUuid.fromString("0000110A-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid AdvAudioDist =
            ParcelUuid.fromString("0000110D-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid HSP =
            ParcelUuid.fromString("00001108-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid HSP_AG =
            ParcelUuid.fromString("00001112-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid Handsfree =
            ParcelUuid.fromString("0000111E-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid Handsfree_AG =
            ParcelUuid.fromString("0000111F-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid AvrcpController =
            ParcelUuid.fromString("0000110E-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid AvrcpTarget =
            ParcelUuid.fromString("0000110C-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid ObexObjectPush =
            ParcelUuid.fromString("00001105-0000-1000-8000-00805f9b34fb");
    public static final ParcelUuid Hid =
            ParcelUuid.fromString("00001124-0000-1000-8000-00805f9b34fb");
    public static final ParcelUuid Hogp =
            ParcelUuid.fromString("00001812-0000-1000-8000-00805f9b34fb");
    public static final ParcelUuid PANU =
            ParcelUuid.fromString("00001115-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid NAP =
            ParcelUuid.fromString("00001116-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid BNEP =
            ParcelUuid.fromString("0000000f-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid PBAP_PCE =
            ParcelUuid.fromString("0000112e-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid PBAP_PSE =
            ParcelUuid.fromString("0000112f-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid MAP =
            ParcelUuid.fromString("00001134-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid MNS =
            ParcelUuid.fromString("00001133-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid MAS =
            ParcelUuid.fromString("00001132-0000-1000-8000-00805F9B34FB");
    public static final ParcelUuid SAP =
            ParcelUuid.fromString("0000112D-0000-1000-8000-00805F9B34FB");

    public static final ParcelUuid BASE_UUID =
            ParcelUuid.fromString("00000000-0000-1000-8000-00805F9B34FB");
    /** Length of bytes for 16 bit UUID */
    public static final int UUID_BYTES_16_BIT = 2;
    /** Length of bytes for 32 bit UUID */
    public static final int UUID_BYTES_32_BIT = 4;
    /** Length of bytes for 128 bit UUID */
    public static final int UUID_BYTES_128_BIT = 16;
    public static final ParcelUuid[] RESERVED_UUIDS = {
            AudioSink, AudioSource, AdvAudioDist, HSP, Handsfree, AvrcpController, AvrcpTarget,
            ObexObjectPush, PANU, NAP, MAP, MNS, MAS, SAP};
    public static boolean isAudioSource(ParcelUuid uuid) {
        return uuid.equals(AudioSource);
    }
    public static boolean isAudioSink(ParcelUuid uuid) {
        return uuid.equals(AudioSink);
    }
    public static boolean isAdvAudioDist(ParcelUuid uuid) {
        return uuid.equals(AdvAudioDist);
    }
    public static boolean isHandsfree(ParcelUuid uuid) {
        return uuid.equals(Handsfree);
    }
    public static boolean isHeadset(ParcelUuid uuid) {
        return uuid.equals(HSP);
    }
    public static boolean isAvrcpController(ParcelUuid uuid) {
        return uuid.equals(AvrcpController);
    }
    public static boolean isAvrcpTarget(ParcelUuid uuid) {
        return uuid.equals(AvrcpTarget);
    }
    public static boolean isInputDevice(ParcelUuid uuid) {
        return uuid.equals(Hid);
    }
    public static boolean isPanu(ParcelUuid uuid) {
        return uuid.equals(PANU);
    }
    public static boolean isNap(ParcelUuid uuid) {
        return uuid.equals(NAP);
    }
    public static boolean isBnep(ParcelUuid uuid) {
        return uuid.equals(BNEP);
    }
    public static boolean isMap(ParcelUuid uuid) {
        return uuid.equals(MAP);
    }
    public static boolean isMns(ParcelUuid uuid) {
        return uuid.equals(MNS);
    }
    public static boolean isMas(ParcelUuid uuid) {
        return uuid.equals(MAS);
    }
    public static boolean isSap(ParcelUuid uuid) {
        return uuid.equals(SAP);
    }
    /**
     * Returns true if ParcelUuid is present in uuidArray
     *
     * @param uuidArray - Array of ParcelUuids
     * @param uuid
     */
    public static boolean isUuidPresent(ParcelUuid[] uuidArray, ParcelUuid uuid) {
        if ((uuidArray == null || uuidArray.length == 0) && uuid == null)
            return true;
        if (uuidArray == null)
            return false;
        for (ParcelUuid element: uuidArray) {
            if (element.equals(uuid)) return true;
        }
        return false;
    }
    /**
     * Returns true if there any common ParcelUuids in uuidA and uuidB.
     *
     * @param uuidA - List of ParcelUuids
     * @param uuidB - List of ParcelUuids
     *
     */
    public static boolean containsAnyUuid(ParcelUuid[] uuidA, ParcelUuid[] uuidB) {
        if (uuidA == null && uuidB == null) return true;
        if (uuidA == null) {
            return uuidB.length == 0 ? true : false;
        }
        if (uuidB == null) {
            return uuidA.length == 0 ? true : false;
        }
        HashSet<ParcelUuid> uuidSet = new HashSet<ParcelUuid> (Arrays.asList(uuidA));
        for (ParcelUuid uuid: uuidB) {
            if (uuidSet.contains(uuid)) return true;
        }
        return false;
    }
    /**
     * Returns true if all the ParcelUuids in ParcelUuidB are present in
     * ParcelUuidA
     *
     * @param uuidA - Array of ParcelUuidsA
     * @param uuidB - Array of ParcelUuidsB
     *
     */
    public static boolean containsAllUuids(ParcelUuid[] uuidA, ParcelUuid[] uuidB) {
        if (uuidA == null && uuidB == null) return true;
        if (uuidA == null) {
            return uuidB.length == 0 ? true : false;
        }
        if (uuidB == null) return true;
        HashSet<ParcelUuid> uuidSet = new HashSet<ParcelUuid> (Arrays.asList(uuidA));
        for (ParcelUuid uuid: uuidB) {
            if (!uuidSet.contains(uuid)) return false;
        }
        return true;
    }
    /**
     * Extract the Service Identifier or the actual uuid from the Parcel Uuid.
     * For example, if 0000110B-0000-1000-8000-00805F9B34FB is the parcel Uuid,
     * this function will return 110B
     * @param parcelUuid
     * @return the service identifier.
     */
    public static int getServiceIdentifierFromParcelUuid(ParcelUuid parcelUuid) {
        UUID uuid = parcelUuid.getUuid();
        long value = (uuid.getMostSignificantBits() & 0x0000FFFF00000000L) >>> 32;
        return (int)value;
    }
    /**
     * Parse UUID from bytes. The {@code uuidBytes} can represent a 16-bit, 32-bit or 128-bit UUID,
     * but the returned UUID is always in 128-bit format.
     * Note UUID is little endian in Bluetooth.
     *
     * @param uuidBytes Byte representation of uuid.
     * @return {@link ParcelUuid} parsed from bytes.
     * @throws IllegalArgumentException If the {@code uuidBytes} cannot be parsed.
     */
    public static ParcelUuid parseUuidFrom(byte[] uuidBytes) {
        if (uuidBytes == null) {
            throw new IllegalArgumentException("uuidBytes cannot be null");
        }
        int length = uuidBytes.length;
        if (length != UUID_BYTES_16_BIT && length != UUID_BYTES_32_BIT &&
                length != UUID_BYTES_128_BIT) {
            throw new IllegalArgumentException("uuidBytes length invalid - " + length);
        }
        // Construct a 128 bit UUID.
        if (length == UUID_BYTES_128_BIT) {
            ByteBuffer buf = ByteBuffer.wrap(uuidBytes).order(ByteOrder.LITTLE_ENDIAN);
            long msb = buf.getLong(8);
            long lsb = buf.getLong(0);
            return new ParcelUuid(new UUID(msb, lsb));
        }
        // For 16 bit and 32 bit UUID we need to convert them to 128 bit value.
        // 128_bit_value = uuid * 2^96 + BASE_UUID
        long shortUuid;
        if (length == UUID_BYTES_16_BIT) {
            shortUuid = uuidBytes[0] & 0xFF;
            shortUuid += (uuidBytes[1] & 0xFF) << 8;
        } else {
            shortUuid = uuidBytes[0] & 0xFF ;
            shortUuid += (uuidBytes[1] & 0xFF) << 8;
            shortUuid += (uuidBytes[2] & 0xFF) << 16;
            shortUuid += (uuidBytes[3] & 0xFF) << 24;
        }
        long msb = BASE_UUID.getUuid().getMostSignificantBits() + (shortUuid << 32);
        long lsb = BASE_UUID.getUuid().getLeastSignificantBits();
        return new ParcelUuid(new UUID(msb, lsb));
    }
    /**
     * Parse UUID to bytes. The returned value is shortest representation, a 16-bit, 32-bit or 128-bit UUID,
     * Note returned value is little endian (Bluetooth).
     *
     * @param uuid uuid to parse.
     * @return shortest representation of {@code uuid} as bytes.
     * @throws IllegalArgumentException If the {@code uuid} is null.
     */
    public static byte[] uuidToBytes(ParcelUuid uuid) {
        if (uuid == null) {
            throw new IllegalArgumentException("uuid cannot be null");
        }
        if (is16BitUuid(uuid)) {
            byte[] uuidBytes = new byte[UUID_BYTES_16_BIT];
            int uuidVal = getServiceIdentifierFromParcelUuid(uuid);
            uuidBytes[0] = (byte)(uuidVal & 0xFF);
            uuidBytes[1] = (byte)((uuidVal & 0xFF00) >> 8);
            return uuidBytes;
        }
        if (is32BitUuid(uuid)) {
            byte[] uuidBytes = new byte[UUID_BYTES_32_BIT];
            int uuidVal = getServiceIdentifierFromParcelUuid(uuid);
            uuidBytes[0] = (byte)(uuidVal & 0xFF);
            uuidBytes[1] = (byte)((uuidVal & 0xFF00) >> 8);
            uuidBytes[2] = (byte)((uuidVal & 0xFF0000) >> 16);
            uuidBytes[3] = (byte)((uuidVal & 0xFF000000) >> 24);
            return uuidBytes;
        }
        // Construct a 128 bit UUID.
        long msb = uuid.getUuid().getMostSignificantBits();
        long lsb = uuid.getUuid().getLeastSignificantBits();
        byte[] uuidBytes = new byte[UUID_BYTES_128_BIT];
        ByteBuffer buf = ByteBuffer.wrap(uuidBytes).order(ByteOrder.LITTLE_ENDIAN);
        buf.putLong(8, msb);
        buf.putLong(0, lsb);
        return uuidBytes;
    }
    /**
     * Check whether the given parcelUuid can be converted to 16 bit bluetooth uuid.
     *
     * @param parcelUuid
     * @return true if the parcelUuid can be converted to 16 bit uuid, false otherwise.
     */
    public static boolean is16BitUuid(ParcelUuid parcelUuid) {
        UUID uuid = parcelUuid.getUuid();
        if (uuid.getLeastSignificantBits() != BASE_UUID.getUuid().getLeastSignificantBits()) {
            return false;
        }
        return ((uuid.getMostSignificantBits() & 0xFFFF0000FFFFFFFFL) == 0x1000L);
    }
    /**
     * Check whether the given parcelUuid can be converted to 32 bit bluetooth uuid.
     *
     * @param parcelUuid
     * @return true if the parcelUuid can be converted to 32 bit uuid, false otherwise.
     */
    public static boolean is32BitUuid(ParcelUuid parcelUuid) {
        UUID uuid = parcelUuid.getUuid();
        if (uuid.getLeastSignificantBits() != BASE_UUID.getUuid().getLeastSignificantBits()) {
            return false;
        }
        if (is16BitUuid(parcelUuid)) {
            return false;
        }
        return ((uuid.getMostSignificantBits() & 0xFFFFFFFFL) == 0x1000L);
    }

根据我的测试，结果正是我想要的。

于 2017-03-11T03:43:40.867 回答
1

您需要在广告数据中添加服务 UUID 作为链接

然后你可以再试一次 startLeScan (UUID[],callback)。

我已经通过这种方法成功地发现了具有特定 UUID [0x1809] 的温度计设备

它对我有用。

于 2013-08-15T05:29:04.467 回答
1

128 位 UUID LE 扫描适用于三星 S5，运行 Android 4.4.2；但是是的，它在 Nexus 4、7 上失败。在 4.4.2、4.4.3、4.4.4 上测试。

于 2014-06-25T01:59:48.917 回答
1

我的经验是，我必须为我想连接的设备提供每一项服务，而不仅仅是我关心的那个。为了解决这个问题，我最终在扫描后进行了服务发现。

于 2013-08-19T21:59:40.710 回答
1

I've found a bug in Android source 5.x, but not present in 6.x.

There a function in this file: http://androidxref.com/5.1.1_r6/xref/external/bluetooth/bluedroid/bta/dm/bta_dm_api.c#1560 used to pass a 32 bit data_mask to bluetooth le advertising and scan response stack. But the structure "tBTA_DM_API_SET_ADV_CONFIG;" manage 16 bit long value !!! So change UINT16 to UINT32 dor data_mask, recompile Android and it will works. Rif http://androidxref.com/5.1.1_r6/xref/external/bluetooth/bluedroid/bta/dm/bta_dm_int.h#594

于 2015-10-09T14:19:48.553 回答
-1

我在使用我的 N7 2013 和 Android 4.3 的 TI 的 SensorTag 时遇到了同样的问题。

我发现工作是启动 LeScan，等待一秒钟，停止它，然后重新启动它。

        if(!mBluetoothAdapter.startLeScan(mBleScanCallback)){
            L.e("could not start scan action");
        }
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {}
        mBluetoothAdapter.stopLeScan(mBleScanCallback);
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {}
        mBluetoothAdapter.startLeScan(mBleScanCallback);

我还注意到有时连接没有建立（这可能与固件实现或正确关闭连接有关，也可能无关）。同样，尝试重新连接到 gatt 似乎可以解决问题。

不得不使用这些解决方法真的很令人失望......

于 2013-09-16T15:26:45.423 回答