Question

我正在Wifi Direct Demo之后开发一个Wifi Direct APP，它可以在API低于26的设备之间工作。在API 26中它不能正常工作，因为它没有检测到APP中的任何对等体，peers.size（）=返回0（但通过设置检测 - ＆gt; Wifi..wifi direct，另一个对等）。

如果API为26的设备尝试连接它不起作用，但如果API低于API 26的设备尝试连接到API 26设备，则连接有效（尽管在API 26设备中检测到任何对等设备））。

为什么在APP中未检测到对等体，但确实出现在设置中（检测在APP中用于26以下的API）？

API 26是否有新的限制？

我得到以下日志：

06-20 00:16:29.625 1157-1157/? E/wificond: NL80211_CMD_TRIGGER_SCAN failed: Device or resource busy
06-20 00:16:29.625 1481-2605/? E/WificondScannerImpl: Failed to start scan, freqs=null
06-20 00:16:29.628 1481-1481/? D/WifiProfileMgrReceiver: handleEvent : android.net.wifi.SCAN_RESULTS
06-20 00:16:29.631 1481-1481/? D/WifiProfileUtil: [getMccMnc] Add Slot 0 SubId 1
06-20 00:16:29.637 1481-18547/? D/WifiPermissionsUtil: Denied: no location permission
06-20 00:16:29.742 1206-2847/? I/LOWI-8.5.0.3.a: [LOWI-Scan] lowi_close_record:Scan completed in 2765827ms and Recieved 0 APs scan results
06-20 00:16:29.743 1206-1279/? I/LOWI-8.5.0.3.a: [LOWIUtils] responseToOutPostcard - TO: GTP-FDAL, FROM:   LOWI-SERVER, RESP:  LOWI_ASYNC_DISCOVERY_SCAN_RESULTS
06-20 00:16:29.743 1157-1157/? E/wificond: Failed to get interface index from scan result notification
06-20 00:16:29.744 1208-1445/? W/XTCC-6.1.2.10: [LOWIUtils] to_eScanTypeResponse - default case
06-20 00:16:29.744 1208-1445/? E/XTCC-6.1.2.10: [FDAL_Manager] handleFreeWiFiScanResult: failed: 11
06-20 00:16:30.011 1206-2847/? I/LOWI-8.5.0.3.a: [LOWI-Scan] lowi_close_record:Scan completed in 2766096ms and Recieved 0 APs scan results
06-20 00:16:30.012 1206-1279/? I/LOWI-8.5.0.3.a: [LOWIUtils] responseToOutPostcard - TO: GTP-FDAL, FROM:   LOWI-SERVER, RESP:  LOWI_ASYNC_DISCOVERY_SCAN_RESULTS
06-20 00:16:30.013 1208-1445/? W/XTCC-6.1.2.10: [LOWIUtils] to_eScanTypeResponse - default case
06-20 00:16:30.013 1208-1445/? E/XTCC-6.1.2.10: [FDAL_Manager] handleFreeWiFiScanResult: failed: 11
06-20 00:16:30.483 1206-2847/? I/LOWI-8.5.0.3.a: [LOWI-Scan] lowi_close_record:Scan completed in 2766568ms and Recieved 0 APs scan results
06-20 00:16:30.484 1206-1279/? I/LOWI-8.5.0.3.a: [LOWIUtils] responseToOutPostcard - TO: GTP-FDAL, FROM:   LOWI-SERVER, RESP:  LOWI_ASYNC_DISCOVERY_SCAN_RESULTS
06-20 00:16:30.485 1208-1445/? W/XTCC-6.1.2.10: [LOWIUtils] to_eScanTypeResponse - default case
06-20 00:16:30.486 1208-1445/? E/XTCC-6.1.2.10: [FDAL_Manager] handleFreeWiFiScanResult: failed: 11
06-20 00:16:30.849 1206-2847/? I/LOWI-8.5.0.3.a: [LOWI-Scan] lowi_close_record:Scan completed in 2766934ms and Recieved 0 APs scan results
06-20 00:16:30.850 1206-1279/? I/LOWI-8.5.0.3.a: [LOWIUtils] responseToOutPostcard - TO: GTP-FDAL, FROM:   LOWI-SERVER, RESP:  LOWI_ASYNC_DISCOVERY_SCAN_RESULTS
06-20 00:16:30.852 1208-1445/? W/XTCC-6.1.2.10: [LOWIUtils] to_eScanTypeResponse - default case

我添加了位置权限（ACCESS_FINE_LOCATION），但我一直收到此错误：

Failed to get interface index from scan result notification

Answer 1

最后，我已经解决了它：设置->常规->应用程序和通知->应用程序信息->选择您的APP->权限->启用您的位置。

API 26（Oreo）中的无线直接对等发现

1 个答案: