Question

我正在编写一个应用程序，我必须在所选设备上进行服务发现，但每当我在执行fetchUuid时，它总是在远程设备上为我提供缓存的UUID。

这是我正在尝试的

public boolean UUIDsearch(BluetoothDevice device){

    t=device.fetchUuidsWithSdp();
    Log.d(TAG,"Device class = :"+device.getClass());



    mReceiver = new BroadcastReceiver() {
      @Override
      public void onReceive(Context arg0, Intent intent) {

          String action = intent.getAction();
        //BluetoothDevice deviceExtra = intent.getParcelableExtra("android.bluetooth.device.extra.DEVICE");
          if (BluetoothDevice.ACTION_UUID.equals(action)){
             uuidExtra =intent.getParcelableArrayExtra("android.bluetooth.device.extra.UUID");
          }
          Log.d(TAG,"SDP has no errors: = "+t);
         // if(found==false){
          for(int i=0;i<uuidExtra.length;i++){
              Log.d(TAG,"UUID:   "+ uuidExtra[i]);
              if((uuidExtra[i].toString()).equals(MY_UUID.toString())){
                  found=true;
                  Log.d(TAG,"Match found in loop");

              }

          }
         // }
      }
  };



  // Register the BroadcastReceiver

  IntentFilter filter1 = new IntentFilter(BluetoothDevice.ACTION_UUID);
  registerReceiver(mReceiver, filter1);

  return true;

}

有人能告诉我代码有什么问题。

这是logcat：

这是启动descovery时的错误：

 09-05 15:05:15.906: D/(32591): bta_jv_start_discovery_cback: p_sdp_rec:0x52ab0e4c
 09-05 15:05:15.906: D/BTIF_SOCK(32591): jv_dm_cback: event:8, slot id:26
 09-05 15:05:15.906: E/BTIF_SOCK(32591): ## ERROR : jv_dm_cback: BTA_JV_DISCOVERY_COMP_EVT, slot id:26, found channle #, status:0, scn:7##
 09-05 15:05:15.906: I/(32591): BTA_JvRfcommConnect
 09-05 15:05:15.910: D/BluetoothSocket(2100): inputStream.read ret: 4
 09-05 15:05:15.910: D/(32591): releasing SDP rsp_list

发生上述错误后，fetchUuidWithSdp（）将缓存的UUID作为错误返回意图

 09-04 16:54:51.851: I/(24860): BTA got event 0x206
 09-04 16:54:51.851: I/(24860): btif_dm_search_services_evt:  event = 2
 09-04 16:54:51.851: D/(24860): btif_dm_search_services_evt:(result=0x0, services 0xa42ed8f)
 09-04 16:54:51.851: E/(24860): Index: 0 uuid:00001101-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.851: E/(24860): Index: 1 uuid:00001103-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.851: E/(24860): Index: 2 uuid:0000110a-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.851: E/(24860): Index: 3 uuid:00001105-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.851: E/(24860): Index: 4 uuid:00001106-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.851: E/(24860): Index: 5 uuid:00001110-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.851: E/(24860): Index: 6 uuid:00001104-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.851: E/(24860): Index: 7 uuid:0000111b-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.855: E/(24860): Index: 8 uuid:00001115-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.855: E/(24860): Index: 9 uuid:00001116-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.855: E/(24860): Index: 10 uuid:0000112d-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.855: E/(24860): Index: 11 uuid:0000112f-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.855: E/(24860): Index: 12 uuid:00001132-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.855: E/(24860): Index: 13 uuid:00001400-0000-1000-8000-00805f9b34fb
 09-04 16:54:51.855: D/(24860): btif_dm_search_services_evt Remote Service SDP done. Call bond_state_changed_cb BONDED
 09-04 16:54:51.855: D/(24860): bond_state_changed: state=2 prev_state=1
 09-04 16:54:51.855: D/(24860): HAL bt_hal_cbacks->bond_state_changed_cb
 09-04 16:54:51.855: I/(24860): bta_dm_search_sm_execute state:3, event:0x206
 09-04 16:54:51.855: D/(24860): bta_dm_search_cmpl
 09-04 16:55:59.703: E/BluetoothRemoteDevices(24860): aclStateChangeCallback: State:DisConnected to Device:00:0A:3A:64:A7:34

上述UUID被标记为错误，因为fetchUuidWithSdp在服务发现中遇到错误时返回缓存的UUID，或者需要很长时间才能执行此操作。

Answer 1

我看到这是一篇旧帖子，但它是我在 Google 搜索中关于 Android 和服务发现协议 (SDP) 中缓存的 UUID 的第一个结果

Android 缓存设备的 SDP UUID 记录以及设备的蓝牙地址，因此如果您更改服务的 UUID 而不是设备的蓝牙地址，Android 仍然会在列表中保留旧的缓存 UUID在设备上调用 getUuids() 时的 UUID。

摆脱缓存的 UUID 记录的唯一方法是在 Android 系统设置中重置网络设置。似乎无法以编程方式清除缓存。

fetchUuidWithSdp总是给出缓存的UUID

1 个答案: