Question

我有一台Xperia Z3C，Android 5.1.1，我试图通过蓝牙将它连接到Nexus 4 Android 6.0.1。配对它们是可以的，但是当我尝试连接它们时，它会说“已连接”。不到一秒钟并自动断开连接。

这是一个已知问题吗？我还没有发现任何相关信息。

这是logcat所说的：

03-14 17:25:55.308: E/bt-btif(14245): bte_scan_filt_param_cfg_evt, 1
03-14 17:25:55.308: E/bt-btif(14245): bte_scan_filt_param_cfg_evt, 1
03-14 17:25:55.990: E/bt-btm(14245): new address: xx:xx:xx:xx:xx:xx
03-14 17:25:55.990: E/bt-btm(14245): new address: xx:xx:xx:xx:xx:xx
03-14 17:25:56.712: E/bt-btm(14245): new address: xx:xx:xx:xx:xx:xx
03-14 17:25:57.464: E/bt-btif(14245): bte_scan_filt_param_cfg_evt, 1
03-14 17:25:57.814: E/bt-btm(14245): Ignoring RNR as the state is not BTM_SEC_STATE_GETTING_NAME
03-14 17:25:57.933: E/NetlinkEvent(318): Unknown ifindex 41 in RTM_DELADDR
03-14 17:25:57.963: E/dhcpcd(15974): bt-pan: interface not found or invalid
03-14 17:25:57.986: E/BluetoothPanServiceJni(14245): ## ERROR : disconnectPanNative(L224): Failed disconnect pan channel, status: 1##
03-14 17:25:58.139: E/BluetoothTetheringNetworkFactory(14245): DHCP request error:DHCP result was failed
03-14 17:26:01.382: E/bt-btm(14245): btm_sec_disconnected - Clearing Pending flag

Answer 1

尝试从我的Android应用程序扫描蓝牙设备时遇到了同样的问题。有趣的是它不会抛出任何异常（捕获或未捕获）并且无声地失败！ API级别＆gt; = 23（Android 6.0）的设备会出现此问题。这是我的Logcat日志的摘录：

03-30 14:07:52.099 192-211/? I/BufferQueueProducer: [org.manios.testbt/org.manios.testbt.printing.BluetoothPrinterDiscovery](this:0x7fa16de400,id:1467,api:1,p:26262,c:192) queueBuffer: fps=0.19 dur=5154.29 max=5154.29 min=5154.29
03-30 14:07:52.114 192-192/? I/SurfaceFlinger: [Built-in Screen (type:0)] fps:1.091767,dur:1831.89,max:999.66,min:832.23
03-30 14:07:52.137 774-1001/? D/InputReader: AP_PROF:AppLaunch_dispatchPtr:Up:89556864, ID:0, Index:2056797440
03-30 14:07:52.137 774-1001/? I/PerfService: PerfServiceNative_boostEnableTimeoutMsAsync:3, 100
03-30 14:07:52.138 26262-26262/org.manios.testbt D/SettingsInterface:  from settings cache , name = sound_effects_enabled , value = 0
03-30 14:07:52.138 26262-26262/org.manios.testbt D/BluetoothAdapter: isEnabled
03-30 14:07:52.140 26262-26262/org.manios.testbt D/BluetoothAdapter: getName
03-30 14:07:52.141 774-1636/? D/BluetoothManagerService: checkIfCallerIsForegroundUser: valid=true callingUser=0 parentUser=-10000 foregroundUser=0
03-30 14:07:52.142 21807-21818/? D/BluetoothAdapterProperties: getName: mName = Lenovo TAB3 8
03-30 14:07:52.144 26262-666/org.manios.testbt D/BluetoothAdapter: isEnabled
03-30 14:07:52.146 26262-666/org.manios.testbt D/BluetoothAdapter: isDiscovering
03-30 14:07:52.148 26262-666/org.manios.testbt D/BluetoothAdapter: 109507751: getState(). Returning 12
03-30 14:07:52.152 21807-21817/? D/BluetoothAdapterProperties: isDiscovering: mDiscovering = false
03-30 14:07:52.156 26262-666/org.manios.testbt D/BluetoothAdapter: startDiscovery
03-30 14:07:52.158 26262-666/org.manios.testbt D/BluetoothAdapter: 109507751: getState(). Returning 12
03-30 14:07:52.160 21807-21830/? W/bt_btif: bta_dm_check_av:0
03-30 14:07:52.172 21807-21830/? E/bt_btif: bte_scan_filt_param_cfg_evt, 1
03-30 14:07:52.181 21807-21823/? I/BluetoothAdapterProperties: Callback:discoveryStateChangeCallback with state:1
03-30 14:07:52.182 774-2924/? V/ActivityManager: Broadcast: Intent { act=android.bluetooth.adapter.action.DISCOVERY_STARTED flg=0x10 } ordered=false userid=0 callerApp=ProcessRecord{c376192 21807:com.android.bluetooth/1002}
03-30 14:07:52.184 1057-1265/? V/BluetoothEventManager: Received android.bluetooth.adapter.action.DISCOVERY_STARTED
03-30 14:07:52.185 1057-1265/? D/BluetoothEventManager: scanning state change to true
03-30 14:07:52.186 21983-21983/? D/ActivityThread: BDC-Calling onReceive: intent=Intent { act=android.bluetooth.adapter.action.DISCOVERY_STARTED flg=0x10 cmp=com.android.settings/.bluetooth.BluetoothDiscoveryReceiver }, receiver=com.android.settings.bluetooth.BluetoothDiscoveryReceiver@b02fe63
03-30 14:07:52.186 21983-21983/? V/BluetoothDiscoveryReceiver: Received: android.bluetooth.adapter.action.DISCOVERY_STARTED
03-30 14:07:52.187 21983-21983/? D/ActivityThread: BDC-RECEIVER handled : 0 / ReceiverData{intent=Intent { act=android.bluetooth.adapter.action.DISCOVERY_STARTED flg=0x10 cmp=com.android.settings/.bluetooth.BluetoothDiscoveryReceiver } packageName=com.android.settings resultCode=-1 resultData=null resultExtras=null}
03-30 14:07:52.218 774-1001/? D/InputReader: AP_PROF:AppLaunch_dispatchPtr:Down:89556946, ID:0, Index:2056794048
03-30 14:07:52.219 774-1001/? I/PerfService: PerfServiceNative_boostEnableAsync:3

我在使用此issue进行了一些搜索后发现，在API Level＆gt; = 23（Android 6.0）中，我们必须向AndroidManifext.xml添加以下权限

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

以便扫描和其他蓝牙操作正常运行。

在Android文档中，它在BluetoothAdapter.startDiscovery()中说明它需要BLUETOOTH_ADMIN权限，没有进一步的详细信息。但如果我们看一下BluetoothLeScanner.startScan()，就会明确指出：

需要BLUETOOTH_ADMIN权限。应用必须拥有ACCESS_COARSE_LOCATION或ACCESS_FINE_LOCATION权限才能获得结果。

希望这有帮助！

Answer 2

所以这里可以做两件事。您尝试与之建立连接的第二个设备在维护连接时遇到问题，或者两者之间的干扰只是在足够长的时间内断开连接但不足以完全终止连接。

连接到另一台Android设备一段时间后，蓝牙会保持断开状态

2 个答案: