机器人BluetoothDevice.getName（）返回NULL [英] android BluetoothDevice.getName() return null
本文介绍了机器人BluetoothDevice.getName（）返回NULL的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在某个时候，BluetoothDevice.getName（）返回NULL。我该如何解决呢？ remoteDeviceName在以下code，也许空。我需要区分由remoteDeviceName我的设备和其他设备。
BluetoothAdapter.getDefaultAdapter（）。startLeScan（新LeScanCallback（）{
@覆盖
公共无效onLeScan（最终BluetoothDevice类设备，最终诠释RSSI，
byte []的scanRecord）{
串remoteDeviceName = device.getName（）;
Log.d（扫描，扫描设备+ remoteDeviceName）;
}）;
解决方案
最后，我找到了解决办法：
1.适用于设备连接的：
从关贸总协定特征<一个阅读设备名称href="https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.device_name.xml">org.bluetooth.characteristic.gap.device_name服务的<一个href="https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.generic_access.xml">org.bluetooth.service.generic_access.
2.对于设备没有连接：
/ **
*获取设备名称从BLE发布的数据
* /
私人LeScanCallback mScanCb =新LeScanCallback（）{
@覆盖
公共无效onLeScan（最终BluetoothDevice类设备，最终诠释RSSI，
byte []的scanRecord）{
最后BleAdvertisedData badata = BleUtil.parseAdertisedData（scanRecord）;
字符串DEVICENAME = device.getName（）;
如果（DEVICENAME == NULL）{
设备名称= badata.getName（）;
}
}
//////////////////////辅助类：BleUtil和BleAdvertisedData ///////////////
最终的公共类BleUtil {
私人最终静态字符串变量= BleUtil.class.getSimpleName（）;
公共静态BleAdvertisedData parseAdertisedData（byte []的advertisedData）{
名单＆LT; UUID＆GT;的UUID =新的ArrayList＆LT; UUID＆GT;（）;
字符串名称= NULL;
如果（advertisedData == NULL）{
返回新BleAdvertisedData（的UUID，名称）;
}
ByteBuffer的缓冲= ByteBuffer.wrap（advertisedData）.order（ByteOrder.LITTLE_ENDIAN）;
而（buffer.remaining（）→2）{
字节长度= buffer.get（）;
如果（长度== 0）打破;
字节类型= buffer.get（）;
开关（类型）{
案例0X02：// 16位的UUID部分名单
案例0×03：// 16位的UUID全部列表
而（长度＆GT; = 2）{
uuids.add（UUID.fromString（的String.Format（
％08X-0000-1000-8000-00805f9b34fb，buffer.getShort（））））;
长度 - = 2;
}
打破;
案值0x06：// 128位的UUID部分名单
案例0×07：// 128位的UUID全部列表
而（长度＆GT; = 16）{
长LSB = buffer.getLong（）;
长MSB = buffer.getLong（）;
uuids.add（新的UUID（MSB，LSB））;
长度 - = 16;
}
打破;
案例×09：
byte []的nameBytes =新的字节[长度1]。
buffer.get（nameBytes）;
尝试 {
名称=新的String（nameBytes，UTF-8）;
}赶上（UnsupportedEncodingException E）{
e.printStackTrace（）;
}
打破;
默认：
buffer.position（buffer.position（）+长度 - 1）;
打破;
}
}
返回新BleAdvertisedData（的UUID，名称）;
}
}
公共类BleAdvertisedData {
私人列表＆LT; UUID＆GT; mUuids;
私人字符串MNAME;
公共BleAdvertisedData（名单＆LT; UUID＆GT;的UUID，字符串名称）{
mUuids =的UUID;
MNAME =名称;
}
公开名单＆LT; UUID＆GT; getUuids（）{
返回mUuids;
}
公共字符串的getName（）{
返回MNAME;
}
}
On sometime, BluetoothDevice.getName() return null. How can i fix it? remoteDeviceName maybe null in following code. And i need distinguish my device and other devices by remoteDeviceName.
BluetoothAdapter.getDefaultAdapter().startLeScan(new LeScanCallback() {
@Override
public void onLeScan(final BluetoothDevice device, final int rssi,
byte[] scanRecord) {
String remoteDeviceName = device.getName();
Log.d("Scanning", "scan device " + remoteDeviceName);
});
解决方案
Finally, i found out the solution:
1.For device connected:
Read device name from gatt characteristic org.bluetooth.characteristic.gap.device_name of service org.bluetooth.service.generic_access.
2.For device no connected:
/**
* Get device name from ble advertised data
*/
private LeScanCallback mScanCb = new LeScanCallback() {
@Override
public void onLeScan(final BluetoothDevice device, final int rssi,
byte[] scanRecord) {
final BleAdvertisedData badata = BleUtil.parseAdertisedData(scanRecord);
String deviceName = device.getName();
if( deviceName == null ){
deviceName = badata.getName();
}
}
////////////////////// Helper Classes: BleUtil and BleAdvertisedData ///////////////
final public class BleUtil {
private final static String TAG=BleUtil.class.getSimpleName();
public static BleAdvertisedData parseAdertisedData(byte[] advertisedData) {
List<UUID> uuids = new ArrayList<UUID>();
String name = null;
if( advertisedData == null ){
return new BleAdvertisedData(uuids, name);
}
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;
case 0x09:
byte[] nameBytes = new byte[length-1];
buffer.get(nameBytes);
try {
name = new String(nameBytes, "utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
break;
default:
buffer.position(buffer.position() + length - 1);
break;
}
}
return new BleAdvertisedData(uuids, name);
}
}
public class BleAdvertisedData {
private List<UUID> mUuids;
private String mName;
public BleAdvertisedData(List<UUID> uuids, String name){
mUuids = uuids;
mName = name;
}
public List<UUID> getUuids(){
return mUuids;
}
public String getName(){
return mName;
}
}
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