这是广告客户（作为类型data传递的通知）AdvertiseData
private void advertise() {
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothLeAdvertiser advertiser = bluetoothAdapter.getBluetoothLeAdvertiser();
AdvertiseSettings settings = new AdvertiseSettings.Builder()
.setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_BALANCED)
.setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_MEDIUM)
.setConnectable(false)
.build();
ParcelUuid pUuid = new ParcelUuid(UUID.fromString("cf2c82b6-6a06-403d-b7e6-13934e602664"));
AdvertiseData data = new AdvertiseData.Builder()
//.setIncludeDeviceName(true)
.addServiceUuid(pUuid)
.addServiceData(pUuid, "123456".getBytes(Charset.forName("UTF-8")))
.build();
AdvertiseCallback advertiseCallback = new AdvertiseCallback() {
@Override
public void onStartSuccess(AdvertiseSettings settingsInEffect) {
Log.i(tag, "Advertising onStartSuccess");
super.onStartSuccess(settingsInEffect);
}
@Override
public void onStartFailure(int errorCode) {
Log.e(tag, "Advertising onStartFailure: " + errorCode);
super.onStartFailure(errorCode);
}
};
advertiser.startAdvertising(settings, data, advertiseCallback);
}
它成功启动。
这是扫描仪
private void discover() {
ScanSettings settings = new ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_BALANCED)
.build();
mBluetoothLeScanner.startScan(null, settings, mScanCallback);
}
private ScanCallback mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
super.onScanResult(callbackType, result);
Log.i(tag, "Discovery onScanResult");
if (result == null) {
Log.i(tag, "no result");
return;
}
ScanRecord scanRecord = result.getScanRecord();
List<ParcelUuid> list = scanRecord != null ? scanRecord.getServiceUuids() : null;
if (list != null) {
Log.i(tag, scanRecord.toString());
for (ParcelUuid uuid : list) {
byte[] data = scanRecord.getServiceData(uuid);
}
}
@Override
public void onBatchScanResults(List<ScanResult> results) {
super.onBatchScanResults(results);
Log.i(tag, "Discovery onBatchScanResults");
}
@Override
public void onScanFailed(int errorCode) {
super.onScanFailed(errorCode);
Log.e(tag, "Discovery onScanFailed: " + errorCode);
}
};
在回调中onScarnResult，我记录toString()了产生此输出的扫描记录
ScanRecord [mAdvertiseFlags=2,
mServiceUuids=[cf2c82b6-6a06-403d-b7e6-13934e602664],
mManufacturerSpecificData={},
mServiceData={000082b6-0000-1000-8000-00805f9b34fb=[49, 50, 51, 52, 53, 54]},
mTxPowerLevel=-2147483648, mDeviceName=null]
uuid 匹配，不幸的是结果
byte[] data = scanRecord.getServiceData(uuid)
是null。我注意到toString输出具有广告数据字符“123456”的 ASCII 码，即 49、50、51、52、53、54
mServiceData={000082b6-0000-1000-8000-00805f9b34fb=[49, 50, 51, 52, 53, 54]}
我想收到正确的广告数据，我做错了吗？
编辑：清单具有蓝牙、bt 管理员和位置的权限。第三个在 Android 6 运行时启动请求
编辑：通过打印整个 scanRecord 你得到这个输出
ScanRecord [mAdvertiseFlags=-1, mServiceUuids=[cf2c82b6-6a06-403d-b7e6-13934e602664], mManufacturerSpecificData={}, mServiceData={000082b6-0000-1000-8000-00805f9b34fb=[49, 53,5,51, 52, 51 54]}，mTxPowerLevel=-2147483648，mDeviceName=null]
基本上你不能使用广告商决定的 uuid，它在 mServiceUuids 数组中，因为与 mServiceData 关联的键是另一个。所以我以这种方式更改了代码，以导航数据映射并获取值（请参阅两个 if 块）
public void onBatchScanResults(List<ScanResult> results) {
super.onBatchScanResults(results);
for (ScanResult result : results) {
ScanRecord scanRecord = result.getScanRecord();
List<ParcelUuid> uuids = scanRecord.getServiceUuids();
Map<ParcelUuid, byte[]> map = scanRecord.getServiceData();
if (uuids != null) {
for (ParcelUuid uuid : uuids) {
byte[] data = scanRecord.getServiceData(uuid);
Log.i(tag, uuid + " -> " + data + " contain " + map.containsKey(uuid));
}
}
if (map != null) {
Set<Map.Entry<ParcelUuid, byte[]>> set = map.entrySet();
Iterator<Map.Entry<ParcelUuid, byte[]>> iterator = set.iterator();
while (iterator.hasNext()) {
Log.i(tag, new String(iterator.next().getValue()));
}
}
}
}
事实上，线
map.containsKey(uuid)
返回 false，因为数据映射未使用广告商的 uuid。
我必须导航地图才能找到值（第二个 if 块），但我没有任何方法知道这是否是我感兴趣的值。无论哪种方式，如果系统输入，我都无法获得该值在接收器应用程序上运行扫描仪代码时我不知道的另一个键。
我该如何处理接收器上的这个问题？我想使用数据字段，但是获取它们的字符串键是先验未知的，并且由系统决定。