Android BluetoothLeScanner startScan PendingIntent在系统范围内失败28次

Question

我有一个Android应用程序用例，我需要“持续”扫描BLE设备。
仅此要求就可能让我成为受虐狂，我想这会让Android成为我的虐待狂。

我知道[我相信]仍然没有正式记录“30秒内不超过5次扫描”和“10分钟内不扫描”、“没有扫描过滤器就没有扫描结果”、背景问题和其他一些问题。

为了缓解这些问题，我使用了类似AltBeacon、Nordic Scanner Compat、SweetBlue和其他一些技巧。

我认为这些都不是这个帖子的问题。

输入我目前的问题。

一般来说，我的应用程序使用PendingIntent开始扫描3.1秒，然后停止（逻辑“暂停”）3.1秒，然后在用户明确退出应用程序后重复（逻辑“恢复”）和硬停止。

下面是一个8.1.0 Nexus 6P的日志，它重新启动并打开蓝牙，启动我的应用程序并开始扫描
我不知道为什么操作系统在开始扫描时调用gatt_api，为什么它在停止时抱怨未找到上下文；也许这些是线索？

2019-07-18 17:51:53.462 13662-13662/? D/AdapterServiceConfig: Adding GattService
2019-07-18 17:51:53.496 13662-13676/? D/BluetoothAdapterService: setProfileServiceState() - Starting service com.android.bluetooth.gatt.GattService
2019-07-18 17:51:53.497 13662-13662/? I/BtGatt.JNI: classInitNative(L871): classInitNative: Success!
2019-07-18 17:51:53.498 13662-13662/? D/BtGatt.DebugUtils: handleDebugAction() action=null
2019-07-18 17:51:53.499 13662-13662/? D/BtGatt.GattService: Received start request. Starting profile...
2019-07-18 17:51:53.499 13662-13662/? I/bt_btif: get_profile_interface: id = gatt
2019-07-18 17:51:53.504 13662-13662/? D/BluetoothAdapterService: processProfileServiceStateChanged() - serviceName=com.android.bluetooth.gatt.GattService isTurningOn=false isTurningOff=false isBleTurningOn=true isBleTurningOff=false
2019-07-18 17:51:53.504 13662-13662/? D/BluetoothAdapterService: GattService is started
2019-07-18 17:51:54.251 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:51:54.251 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1027)] allocated gatt_if=3
2019-07-18 17:51:54.274 4384-4435/? D/BluetoothManagerService: Binding Bluetooth GATT service
2019-07-18 17:51:54.277 4384-4384/? D/BluetoothManagerService: BluetoothServiceConnection: com.android.bluetooth.gatt.GattService
2019-07-18 17:51:54.278 4384-4435/? D/BluetoothManagerService: BluetoothGatt Service is Up
2019-07-18 17:51:54.376 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:51:54.376 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1027)] allocated gatt_if=4
2019-07-18 17:51:54.653 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:51:54.653 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1027)] allocated gatt_if=5
2019-07-18 17:51:54.685 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:51:54.685 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1027)] allocated gatt_if=6

2019-07-18 17:52:00.800 13349-13349/com.myapp V/MyBleScanner: resume: #GATT +mBleScannerInternal.startScan(...)
2019-07-18 17:52:00.818 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:52:00.818 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1027)] allocated gatt_if=6
2019-07-18 17:52:00.818 13349-13349/com.myapp V/MyBleScanner: resume: #GATT mBleScannerInternal.startScan(...); result=SUCCESS(0)
2019-07-18 17:52:00.836 13349-13349/com.myapp V/MyBleScanner: resume: #GATT -mBleScannerInternal.startScan(...)
2019-07-18 17:52:00.837 13349-13349/com.myapp E/MyBleScanner: resume: #GATT mBleScannerInternalStartScanCount=1, elapsedMillisSinceBleScannerInternalStartScanFirstTime=0

2019-07-18 17:52:03.942 13349-13349/com.myapp V/MyBleScanner: pause: #GATT +mBleScannerInternal.stopScan(...)
2019-07-18 17:52:03.959 13662-13674/? E/BtGatt.ContextMap: Context not found for info com.android.bluetooth.gatt.GattService$PendingIntentInfo@2f1237f
2019-07-18 17:52:03.960 13349-13349/com.myapp V/MyBleScanner: pause: #GATT -mBleScannerInternal.stopScan(...)
2019-07-18 17:52:03.966 13349-13349/com.myapp I/MyBleScanner: pause: #GATT mScannedDevices(36)={"31:2C:26:FA:91:5E"=null, "0E:06:E5:5D:1F:9D"=null, "0E:05:A0:00:28:E3"=null, "16:05:05:B8:E9:51"=null, "0E:0A:B0:00:13:2E"=null, "0E:0E:A0:05:C9:B4"=null, "74:F0:1C:42:2A:6C"=null, "0E:0C:00:00:0A:14"=null, "0E:0A:00:00:23:38"=null, "0E:05:A0:00:13:AC"=null, "0E:0E:A0:03:CC:16"=null, "0E:0E:A0:02:22:78"=null, "30:8C:FB:D4:BD:B1"=null, "30:8C:FB:7A:55:21"=null, "CD:A3:87:DA:15:D6"=null, "0E:0E:A0:03:C6:D6"=null, "0E:05:A0:00:32:6E"=null, "0E:0E:A0:05:46:FD"=null, "0E:0E:A0:01:0C:DF"=null, "0E:0E:A0:01:14:36"=null, "0E:0E:A0:01:14:56"=null, "0E:0E:A0:03:F7:1A"=null, "0E:0E:43:21:FE:0E"=null, "0E:0E:A0:0E:E2:72"=null, "0E:0E:A0:04:07:1F"=null, "F5:2A:1E:90:43:D7"=null, "0B:F8:B4:90:A2:3A"=null, "0E:0E:A0:00:1E:DF"=null, "0E:05:A0:00:61:B1"=null, "0E:0E:A0:03:DC:D3"=null, "0E:05:A0:00:84:12"=null, "0E:05:A0:00:84:13"=null, "0E:06:E5:59:D8:B3"=null, "0E:0A:A0:01:3D:13"=null, "2F:41:6D:A2:92:C6"=null, "0E:0A:A0:01:3A:69"=null}
2019-07-18 17:52:04.595 13662-13682/? E/BtGatt.GattService: Exception: android.app.PendingIntent$CanceledException

2019-07-18 17:52:07.076 13349-13349/com.myapp V/MyBleScanner: resume: #GATT +mBleScannerInternal.startScan(...)
2019-07-18 17:52:07.111 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:52:07.112 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1027)] allocated gatt_if=7
2019-07-18 17:52:07.112 13349-13349/com.myapp V/MyBleScanner: resume: #GATT mBleScannerInternal.startScan(...); result=SUCCESS(0)
2019-07-18 17:52:07.127 13349-13349/com.myapp V/MyBleScanner: resume: #GATT -mBleScannerInternal.startScan(...)
2019-07-18 17:52:07.127 13349-13349/com.myapp E/MyBleScanner: resume: #GATT mBleScannerInternalStartScanCount=2, elapsedMillisSinceBleScannerInternalStartScanFirstTime=6291

2019-07-18 17:52:10.231 13349-13349/com.myapp V/MyBleScanner: pause: #GATT +mBleScannerInternal.stopScan(...)
2019-07-18 17:52:10.238 13662-13674/? E/BtGatt.ContextMap: Context not found for info com.android.bluetooth.gatt.GattService$PendingIntentInfo@1377141
2019-07-18 17:52:10.239 13349-13349/com.myapp V/MyBleScanner: pause: #GATT -mBleScannerInternal.stopScan(...)
2019-07-18 17:52:10.242 13349-13349/com.myapp I/MyBleScanner: pause: #GATT mScannedDevices(37)={"31:2C:26:FA:91:5E"=null, "0E:0E:A0:00:18:EC"=null, "0E:06:E5:5D:1F:9D"=null, "0E:05:A0:00:28:E3"=null, "16:05:05:B8:E9:51"=null, "0E:0A:B0:00:13:2E"=null, "0E:0E:A0:05:C9:B4"=null, "74:F0:1C:42:2A:6C"=null, "0E:0A:00:00:23:38"=null, "0E:0C:00:00:0A:14"=null, "0E:05:A0:00:13:AC"=null, "0E:0E:A0:02:22:78"=null, "30:8C:FB:D4:BD:B1"=null, "30:8C:FB:7A:55:21"=null, "CD:A3:87:DA:15:D6"=null, "0E:0E:A0:03:C6:D6"=null, "0E:0E:A0:05:46:FD"=null, "0E:0E:A0:03:3B:16"=null, "0E:0E:A0:01:14:36"=null, "CD:31:C7:3B:84:0F"=null, "0E:0E:A0:02:0B:C1"=null, "DA:A3:9B:E8:3B:E8"=null, "0E:0E:A0:02:24:97"=null, "0E:0E:A0:03:F7:1A"=null, "0E:0E:43:21:FE:0E"=null, "0E:0E:A0:0E:E2:72"=null, "0B:F8:B4:90:A2:3A"=null, "F5:2A:1E:90:43:D7"=null, "0E:0E:A0:00:1E:DF"=null, "0E:05:A0:00:61:B1"=null, "0E:0E:A0:03:DC:D3"=null, "0E:05:A0:00:84:12"=null, "0E:05:A0:00:84:13"=null, "0E:0A:A0:01:3D:13"=null, "0E:06:E5:59:D8:B3"=null, "2F:41:6D:A2:92:C6"=null, "0E:0A:A0:01:3A:69"=null}
2019-07-18 17:52:10.483 13662-13682/? E/BtGatt.GattService: Exception: android.app.PendingIntent$CanceledException

如果=8，那么9，10，…，31，…
。。。

2019-07-18 17:54:43.869 13349-13349/com.myapp V/MyBleScanner: resume: #GATT +mBleScannerInternal.startScan(...)
2019-07-18 17:54:43.893 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:54:43.893 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1027)] allocated gatt_if=32
2019-07-18 17:54:43.893 13349-13349/com.myapp V/MyBleScanner: resume: #GATT mBleScannerInternal.startScan(...); result=SUCCESS(0)
2019-07-18 17:54:43.912 13349-13349/com.myapp V/MyBleScanner: resume: #GATT -mBleScannerInternal.startScan(...)
2019-07-18 17:54:43.913 13349-13349/com.myapp E/MyBleScanner: resume: #GATT mBleScannerInternalStartScanCount=27, elapsedMillisSinceBleScannerInternalStartScanFirstTime=163077
2019-07-18 17:54:43.952 13662-13682/? E/BtGatt.GattService: Exception: android.app.PendingIntent$CanceledException

2019-07-18 17:54:47.021 13349-13349/com.myapp V/MyBleScanner: pause: #GATT +mBleScannerInternal.stopScan(...)
2019-07-18 17:54:47.033 13662-13703/? E/BtGatt.ContextMap: Context not found for info com.android.bluetooth.gatt.GattService$PendingIntentInfo@e09708f
2019-07-18 17:54:47.036 13349-13349/com.myapp V/MyBleScanner: pause: #GATT -mBleScannerInternal.stopScan(...)
2019-07-18 17:54:47.037 13349-13349/com.myapp I/MyBleScanner: pause: #GATT mScannedDevices(37)={"0E:0E:A0:02:0D:1A"=null, "0E:06:E5:5D:1F:9D"=null, "0E:0E:A0:00:18:EC"=null, "16:05:05:B8:E9:51"=null, "0E:0E:FF:F6:BE:30"=null, "74:F0:1C:42:2A:6C"=null, "0E:0C:00:00:0A:14"=null, "0E:0A:00:00:23:38"=null, "0E:0E:A0:03:CC:16"=null, "0E:0E:A0:01:0B:E6"=null, "0E:0E:A0:02:22:78"=null, "30:8C:FB:D4:BD:B1"=null, "30:8C:FB:7A:55:21"=null, "CD:A3:87:DA:15:D6"=null, "0E:05:A0:00:32:6E"=null, "0E:0E:A0:03:28:7B"=null, "0E:0E:A0:01:0C:DF"=null, "CD:31:C7:3B:84:0F"=null, "DA:A3:9B:E8:3B:E8"=null, "0E:0E:A0:01:14:56"=null, "0E:0E:A0:02:24:97"=null, "0E:0E:A0:02:15:F8"=null, "37:AB:CB:F6:2D:70"=null, "0E:0E:43:21:FE:0E"=null, "24:B9:20:97:DC:87"=null, "0E:0E:A0:04:6B:34"=null, "0E:0E:A0:04:07:1F"=null, "0B:F8:B4:90:A2:3A"=null, "F5:2A:1E:90:43:D7"=null, "0E:05:A0:00:61:B0"=null, "0E:0E:A0:03:21:34"=null, "0E:05:A0:00:61:B1"=null, "0E:05:A0:00:84:13"=null, "0E:06:E5:59:D8:B3"=null, "0E:0A:A0:01:3D:13"=null, "2F:41:6D:A2:92:C6"=null, "0E:0A:A0:01:3A:69"=null}
2019-07-18 17:54:47.547 13662-13662/? D/BtGatt.ScanManager: awakened up at time 187337376
2019-07-18 17:54:47.552 13662-13682/? E/BtGatt.GattService: Exception: android.app.PendingIntent$CanceledException

2019-07-18 17:54:50.143 13349-13349/com.myapp V/MyBleScanner: resume: #GATT +mBleScannerInternal.startScan(...)
2019-07-18 17:54:50.173 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:54:50.173 13662-13697/? E/bt_stack: [ERROR:gatt_api.cc(1032)] can't Register GATT client, MAX client reached: 32
2019-07-18 17:54:50.173 13662-13697/? E/bt_btif: Register with GATT stack failed.
2019-07-18 17:54:50.173 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:54:50.174 13349-13349/com.myapp V/MyBleScanner: resume: #GATT mBleScannerInternal.startScan(...); result=SUCCESS(0)
2019-07-18 17:54:50.174 13662-13697/? E/bt_stack: [ERROR:gatt_api.cc(1032)] can't Register GATT client, MAX client reached: 32
2019-07-18 17:54:50.174 13662-13697/? E/bt_btif: Register with GATT stack failed.
2019-07-18 17:54:50.187 13349-13349/com.myapp V/MyBleScanner: resume: #GATT -mBleScannerInternal.startScan(...)
2019-07-18 17:54:50.188 13349-13349/com.myapp E/MyBleScanner: resume: #GATT mBleScannerInternalStartScanCount=28, elapsedMillisSinceBleScannerInternalStartScanFirstTime=169351

在我第28次调用startScan时（除非另一个应用程序已经扫描），大约170秒，操作系统开始报告gatt_api错误，无法注册gatt客户端，最大客户端达到：32，此时：

1. 我得到一个0返回值，并且没有扫描失败的onscanfiled回调
2. 我没有收到显示任何扫描设备的onScanResult回调

...

2019-07-18 17:54:53.291 13349-13349/com.myapp V/MyBleScanner: pause: #GATT +mBleScannerInternal.stopScan(...)
2019-07-18 17:54:53.303 13662-13715/? E/BtGatt.ContextMap: Context not found for info com.android.bluetooth.gatt.GattService$PendingIntentInfo@7eaaf1c
2019-07-18 17:54:53.304 13349-13349/com.myapp V/MyBleScanner: pause: #GATT -mBleScannerInternal.stopScan(...)
2019-07-18 17:54:53.304 13349-13349/com.myapp I/MyBleScanner: pause: #GATT mScannedDevices(0)={}
2019-07-18 17:54:56.410 13349-13349/com.myapp V/MyBleScanner: resume: #GATT +mBleScannerInternal.startScan(...)
2019-07-18 17:54:56.439 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:54:56.439 13662-13697/? E/bt_stack: [ERROR:gatt_api.cc(1032)] can't Register GATT client, MAX client reached: 32
2019-07-18 17:54:56.439 13662-13697/? E/bt_btif: Register with GATT stack failed.
2019-07-18 17:54:56.439 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:54:56.439 13662-13697/? E/bt_stack: [ERROR:gatt_api.cc(1032)] can't Register GATT client, MAX client reached: 32
2019-07-18 17:54:56.439 13662-13697/? E/bt_btif: Register with GATT stack failed.
2019-07-18 17:54:56.440 13349-13349/com.myapp V/MyBleScanner: resume: #GATT mBleScannerInternal.startScan(...); result=SUCCESS(0)
2019-07-18 17:54:56.458 13349-13349/com.myapp V/MyBleScanner: resume: #GATT -mBleScannerInternal.startScan(...)
2019-07-18 17:54:56.458 13349-13349/com.myapp E/MyBleScanner: resume: #GATT mBleScannerInternalStartScanCount=29, elapsedMillisSinceBleScannerInternalStartScanFirstTime=175622
2019-07-18 17:54:59.562 13349-13349/com.myapp V/MyBleScanner: pause: #GATT +mBleScannerInternal.stopScan(...)
2019-07-18 17:54:59.576 13662-13673/? E/BtGatt.ContextMap: Context not found for info com.android.bluetooth.gatt.GattService$PendingIntentInfo@bef4725
2019-07-18 17:54:59.576 13349-13349/com.myapp V/MyBleScanner: pause: #GATT -mBleScannerInternal.stopScan(...)
2019-07-18 17:54:59.577 13349-13349/com.myapp I/MyBleScanner: pause: #GATT mScannedDevices(0)={}
2019-07-18 17:55:02.679 13349-13349/com.myapp V/MyBleScanner: resume: #GATT +mBleScannerInternal.startScan(...)
2019-07-18 17:55:02.697 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:55:02.697 13662-13697/? E/bt_stack: [ERROR:gatt_api.cc(1032)] can't Register GATT client, MAX client reached: 32
2019-07-18 17:55:02.697 13662-13697/? E/bt_btif: Register with GATT stack failed.
2019-07-18 17:55:02.697 13662-13697/? I/bt_stack: [INFO:gatt_api.cc(1004)] GATT_Register
2019-07-18 17:55:02.697 13662-13697/? E/bt_stack: [ERROR:gatt_api.cc(1032)] can't Register GATT client, MAX client reached: 32
2019-07-18 17:55:02.697 13662-13697/? E/bt_btif: Register with GATT stack failed.
2019-07-18 17:55:02.697 13349-13349/com.myapp V/MyBleScanner: resume: #GATT mBleScannerInternal.startScan(...); result=SUCCESS(0)
2019-07-18 17:55:02.707 13349-13349/com.myapp V/MyBleScanner: resume: #GATT -mBleScannerInternal.startScan(...)
2019-07-18 17:55:02.707 13349-13349/com.myapp E/MyBleScanner: resume: #GATT mBleScannerInternalStartScanCount=30, elapsedMillisSinceBleScannerInternalStartScanFirstTime=181871
2019-07-18 17:55:05.810 13349-13349/com.myapp V/MyBleScanner: pause: #GATT +mBleScannerInternal.stopScan(...)
2019-07-18 17:55:05.822 13662-13703/? E/BtGatt.ContextMap: Context not found for info com.android.bluetooth.gatt.GattService$PendingIntentInfo@82cc0fa
2019-07-18 17:55:05.822 13349-13349/com.myapp V/MyBleScanner: pause: #GATT -mBleScannerInternal.stopScan(...)
2019-07-18 17:55:05.823 13349-13349/com.myapp I/MyBleScanner: pause: #GATT mScannedDevices(0)={}

如果在这里发生泄漏，看起来有某种分配的gatt_，但我只是调用startScan（…，mpendingent）和stopScan（…，mpendingent），使用相同的最终/不可变的PendingIntent成员，因此我非常怀疑代码中的任何内容是否直接导致了“泄漏”。

此时没有应用程序可以扫描BLE设备。不是我的应用程序或SweetBlue Toolbox、BLE Scanner或我尝试过的任何其他第三方BLE扫描应用程序。

为什么会这样？

当手机进入这种状态时，我可以通过关闭手机的蓝牙并再次打开来恢复工作状态。

AltBeacon有一个BluetoothMedic类，据说该类可以检测这种状态，并通过编程关闭和再次打开蓝牙，但我将其作为依赖项添加，并在其onScanFailed回调中设置断点，但它从未被调用，这违背了该类的全部目的，我发现很难相信这是他们已知的问题/

我首先不希望出现这种泄漏，并且能够无限期地每隔3.1秒停止和启动扫描，并可靠地扫描范围内的本地设备。

除此之外，如果我必须这样做，我将不得不通过编程关闭和重新打开蓝牙（是的，每170秒一次……欢迎来到我的地狱，在Android BLE世界），但如果没有工作的startScan返回值或onScanFailed回调，就无法确定扫描零设备是否意味着手机已进入这种不良状态，或者周围确实存在零设备。

我相信这段代码已经运行了一年多，直到最近，最多几个月前，才开始以这种方式运行。

有希望吗？

Android BLE真的^∞很烂。：/

Answer 1

停止/启动扫描肯定有问题。我认为具有完全相同回调/挂起意图的startScan不应启动另一次扫描。

你能在这里发一些代码吗？您的代码似乎没有正确停止扫描。也许由于某种原因，你的吊坠开始时不同？

它能在其他手机上复制吗？

Answer 2

问题没有解决，用1.4.1！“listent”PendingIntent不再广播了，这是真的，但是蓝牙内部扫描仍然没有停止，这是证明：“BtGatt。ScanManager：及时唤醒”。测试设备：Pixel2 with Android 10

发现的问题：BluetoothLeScannerImplOreo-

这样，启动的pendingIntent hashCode（）将不同于停止pendingIntent hashCode（）！！这太糟糕了！这是一个bug，因为文档澄清了这两个意图必须是相同的，在这个库案例中是完全不同的。

解决方案：将“requestCode”作为额外参数添加到CreateStartingPendingContent（…，@NonNull final int requestCode）和CreateStoppingPendingContent（…，@NonNull final int requestCode）方法中，并将其用于id。final int id=requestCode//回调意图。hashCode（）；是的，启动和停止的请求代码必须相同。

https://github.com/NordicSemiconductor/Android-Scanner-Compat-Library/issues/58#issuecomment-555964455

Answer 3

我最后的结论是，Nordic的Android Scanner Compat库确实创建了一个可停止的PendingIntent，但问题是它调用了PendingIntent。getBroadcast（context，id，intent，pendingent.FLAG\u CANCEL\u CURRENT）当它应该调用pendingent时。getBroadcast（context，id，intent，PendingIntent.FLAG\u UPDATE\u CURRENT）

我把它固定在我的叉子上，打开了一个问题，并将打开一个公关。

我相信我找到了答案。

今天，我编写了一个独立的应用程序，作为重新处理这个问题的简单测试用例。https://github.com/paulpv/AndroidBleStartScanPendingIntentLeak

想想看，它没有重新编程。

测试应用程序和我的生产应用程序的一大区别是：

1. 在测试应用程序中，我直接调用android.bluetooth.le.BluetoothLeScanner.startScan（…）
2. 在我的生产应用程序中，我使用NordicSemiconductor的Android Scanner Compat库(https://github.com/NordicSemiconductor/Android-Scanner-Compat-Library)

我的测试应用程序没有重现问题，但当我将其调整为使用Nordic的Android扫描仪Compat时，我的问题开始重现。
我撤消了我的更改；没有重现。
我重新做了我的更改；重现。
冒烟的枪？

查看他们的代码，我发现：html" target="_blank">https://github.com/NordicSemiconductor/Android-Scanner-Compat-Library/blob/master/scanner/src/main/java/no/nordicsemi/android/support/v18/scanner/BluetoothLeScannerImplOreo.java#L111

final PendingIntent pendingIntent = createStartingPendingIntent(nonNullFilters,
                nonNullSettings, context, callbackIntent);
scanner.startScan(nativeFilters, nativeSettings, pendingIntent);

他们实例化了他们自己的PendingEvent，它封装了我的…但在他们的代码中没有任何地方可以跟踪他们的PendingEvent，这样他们就可以用相同的PendingEvent成功调用stopScan（PendingEvent）。

https://github.com/NordicSemiconductor/Android-Scanner-Compat-Library/blob/master/scanner/src/main/java/no/nordicsemi/android/support/v18/scanner/BluetoothLeScannerImplOreo.java#L126

final PendingIntent pendingIntent = createStoppingPendingIntent(context, callbackIntent);
scanner.stopScan(pendingIntent);

这两个悬而未决的内容不可能匹配，这样操作系统就可以正确地停止扫描。

我通过在我的代码分支中添加日志来证实这一点（搜索“PendingEvent=”near everystartScan和stopScan；注意，它们是不同的实例，以及每个分配的gatt\U中不断增加的数量，如果=）：

2019-07-19 21:14:51.230 16905-16905/com.testapp V/BleScannerManager: scan: #GATT +bleScanner.startScan(...)
2019-07-19 21:14:58.424 16905-16905/com.testapp V/BleScannerImplOreo: #GATT startScanInternal: pendingIntent=PendingIntent{1dfc67: android.os.BinderProxy@e560a14}
2019-07-19 21:14:58.468 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(948)] GATT_Register 3c2e1fd9-d3fd-6897-a113-863aa50df781
2019-07-19 21:14:58.468 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(968)] allocated gatt_if=7
2019-07-19 21:14:58.478 16905-16905/com.testapp V/BleScannerManager: scan: #GATT bleScanner.startScan(...); result=SUCCESS(0)
2019-07-19 21:14:58.479 16905-16905/com.testapp V/BleScannerManager: scan: #GATT -bleScanner.startScan(...)
2019-07-19 21:14:58.481 16905-16905/com.testapp E/BleScannerManager: #GATT bleScannerStartScanCount=1, elapsedMillisSinceBleScannerStartScanFirstTime=0
2019-07-19 21:15:03.521 1447-1447/? D/BtGatt.ScanManager: awakened up at time 614650173
2019-07-19 21:15:08.250 16905-16905/com.testapp V/BleScannerManager: scan: #GATT +bleScanner.stopScan(...)
2019-07-19 21:15:08.255 16905-16905/com.testapp V/BleScannerImplOreo: #GATT stopScanInternal: pendingIntent=PendingIntent{dc4115f: android.os.BinderProxy@84087ac}
2019-07-19 21:15:08.259 1447-1982/? E/BtGatt.ContextMap: Context not found for info com.android.bluetooth.gatt.GattService$PendingIntentInfo@77d2d25
2019-07-19 21:15:08.260 16905-16905/com.testapp V/BleScannerManager: scan: #GATT -bleScanner.stopScan(...)
2019-07-19 21:15:08.556 1447-1447/? D/BtGatt.ScanManager: awakened up at time 614655208
2019-07-19 21:15:08.570 1447-1554/? E/BtGatt.GattService: Exception: android.app.PendingIntent$CanceledException
2019-07-19 21:15:20.556 16905-16905/com.testapp V/BleScannerManager: scan: #GATT +bleScanner.startScan(...)
2019-07-19 21:15:20.570 16905-16905/com.testapp V/BleScannerImplOreo: #GATT startScanInternal: pendingIntent=PendingIntent{2ce86d6: android.os.BinderProxy@84087ac}
2019-07-19 21:15:20.575 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(948)] GATT_Register 6b444e39-d61a-1d92-52d6-afd6e901b56b
2019-07-19 21:15:20.575 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(968)] allocated gatt_if=8
2019-07-19 21:15:20.576 16905-16905/com.testapp V/BleScannerManager: scan: #GATT bleScanner.startScan(...); result=SUCCESS(0)
2019-07-19 21:15:20.576 16905-16905/com.testapp V/BleScannerManager: scan: #GATT -bleScanner.startScan(...)
2019-07-19 21:15:20.576 16905-16905/com.testapp E/BleScannerManager: #GATT bleScannerStartScanCount=2, elapsedMillisSinceBleScannerStartScanFirstTime=22097
2019-07-19 21:15:23.264 16905-16905/com.testapp V/BleScannerManager: scan: #GATT +bleScanner.stopScan(...)
2019-07-19 21:15:23.269 16905-16905/com.testapp V/BleScannerImplOreo: #GATT stopScanInternal: pendingIntent=PendingIntent{ebafcb0: android.os.BinderProxy@ebb6729}
2019-07-19 21:15:23.272 1447-1982/? E/BtGatt.ContextMap: Context not found for info com.android.bluetooth.gatt.GattService$PendingIntentInfo@3abaefa
2019-07-19 21:15:23.272 16905-16905/com.testapp V/BleScannerManager: scan: #GATT -bleScanner.stopScan(...)
2019-07-19 21:15:24.968 16905-16905/com.testapp V/BleScannerManager: scan: #GATT +bleScanner.startScan(...)
2019-07-19 21:15:24.980 16905-16905/com.testapp V/BleScannerImplOreo: #GATT startScanInternal: pendingIntent=PendingIntent{8b1626b: android.os.BinderProxy@ebb6729}
2019-07-19 21:15:24.990 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(948)] GATT_Register 0bbb0b8f-2c63-dfc2-268d-fbfe39360ddf
2019-07-19 21:15:24.990 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(968)] allocated gatt_if=9
2019-07-19 21:15:24.990 16905-16905/com.testapp V/BleScannerManager: scan: #GATT bleScanner.startScan(...); result=SUCCESS(0)
2019-07-19 21:15:24.990 16905-16905/com.testapp V/BleScannerManager: scan: #GATT -bleScanner.startScan(...)
2019-07-19 21:15:24.991 16905-16905/com.testapp E/BleScannerManager: #GATT bleScannerStartScanCount=3, elapsedMillisSinceBleScannerStartScanFirstTime=26511
2019-07-19 21:15:25.019 1447-1554/? E/BtGatt.GattService: Exception: android.app.PendingIntent$CanceledException
2019-07-19 21:15:25.795 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(948)] GATT_Register 32a50296-06f2-ed4d-f83c-25da059a4a19
2019-07-19 21:15:25.795 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(968)] allocated gatt_if=10
2019-07-19 21:15:26.046 1447-1447/? D/BtGatt.ScanManager: awakened up at time 614672699
2019-07-19 21:15:27.000 16905-16905/com.testapp V/BleScannerManager: scan: #GATT +bleScanner.stopScan(...)
2019-07-19 21:15:27.005 16905-16905/com.testapp V/BleScannerImplOreo: #GATT stopScanInternal: pendingIntent=PendingIntent{40e339d: android.os.BinderProxy@6340012}
2019-07-19 21:15:27.008 1447-1982/? E/BtGatt.ContextMap: Context not found for info com.android.bluetooth.gatt.GattService$PendingIntentInfo@96b43b4
2019-07-19 21:15:27.009 16905-16905/com.testapp V/BleScannerManager: scan: #GATT -bleScanner.stopScan(...)
2019-07-19 21:15:28.679 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(948)] GATT_Register f119757a-00ff-29b4-72e0-952c5e0db695
2019-07-19 21:15:28.679 1447-1941/? I/bt_stack: [INFO:gatt_api.cc(968)] allocated gatt_if=10
2019-07-19 21:15:28.810 1447-1447/? D/BtGatt.ScanManager: awakened up at time 614675462
2019-07-19 21:15:28.822 1447-1554/? E/BtGatt.GattService: Exception: android.app.PendingIntent$CanceledException

看起来我要么在他们的回购协议上打开一个问题，要么自己解决，然后发给他们一份公关。

感谢那些插话的人；你的问题让我找到了正确的方向！