BluetoothLeScanner startScan()在没有日志的情况下无法工作。

问题描述 投票：0回答：1

我做了一个扫描信标设备的应用程序。

显然，它成功地工作了。

我没有修改过相关的代码。

但是今天，我试着扫描了一下，没有成功！只是留下了日志。

它只是留下了日志 start scan和 scan timeout.

这是我的代码。

ScanViewModel.kt

class ScanViewModel(application: Application) : AndroidViewModel(application) {

    companion object{
        private const val TAG = "ScanViewModel"
        private const val UUID = "01122334-4556-6778-899a-abbccddeeff0"
        private const val MIN_RSSI = -85
    }

    private var isScanning = false

    private val bluetoothAdapter: BluetoothAdapter? by lazy(LazyThreadSafetyMode.NONE) {
        val bluetoothManager = application.
            getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
        bluetoothManager.adapter
    }

    private val BluetoothAdapter.isDisabled: Boolean
        get() = !isEnabled

    private val handler = Handler()

    private var runnable = Runnable {
        isScanning = false
        bluetoothAdapter!!.bluetoothLeScanner.stopScan(scanCallback)
        Log.d(TAG, "Scan Timeout")
    }

    fun isBluetoothOn(): Boolean {
        return bluetoothAdapter!!.isDisabled
    }

    fun startScan(time: Long) {
        handler.postDelayed(runnable, time)
        isScanning = true
        bluetoothAdapter!!.bluetoothLeScanner.startScan(scanCallback)
        Log.d(TAG, "Scan is started")
    }

    fun stopScan() {
        isScanning = false
        bluetoothAdapter!!.bluetoothLeScanner.stopScan(scanCallback)
        Log.d(TAG, "Scan is terminated")
    }

    private val scanCallback = object : ScanCallback() {
        override fun onScanResult(callbackType: Int, result: ScanResult?) {
            super.onScanResult(callbackType, result)

            result?.let { it ->
                Log.d(TAG, "find : ${result.device}")

                if (it.rssi < MIN_RSSI) {
                    Log.d(TAG, "rssi (${it.rssi}) is too week. return")
                    return
                }

                if (it.scanRecord == null) {
                    Log.d(TAG, "This device does not have scanRecord. return")
                    return
                }

                val bleDevice = BleCreater.create(it.device, it.rssi, it.scanRecord!!.bytes)

                Log.d(TAG, "uuid : ${bleDevice!!.uuid}, major : ${bleDevice.major}, minor : ${bleDevice.minor}, ${bleDevice.rssi}")

                if (bleDevice.uuid == UUID) {
                    Log.d(TAG, "H/W has been found")

                    stopScan()

                    return
                }
            }
        }

        override fun onBatchScanResults(results: MutableList<ScanResult>?) {
            super.onBatchScanResults(results)
        }

        override fun onScanFailed(errorCode: Int) {
            super.onScanFailed(errorCode)
        }
    }
}

ScanActivity

class ScanActivity : BaseActivity<ActivityScanBinding>(R.layout.activity_scan) {
    private lateinit var vm: ScanViewModel
    private lateinit var viewModelFactory: ViewModelProvider.AndroidViewModelFactory

    private companion object {
        const val SCAN_PERIOD = 10000L
        const val REQUEST_ENABLE_BT = 1000
        const val TAG = "ScanActivity"

    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        viewModelFactory = ViewModelProvider.AndroidViewModelFactory(application)
        vm = ViewModelProvider(this, viewModelFactory).get(ScanViewModel::class.java)

        if (BluetoothUtil.isBluetoothAvailable(this)) {
            Log.d(TAG, "This device does not support Bluetooth.")
            finish()
        } else {
            Log.d(TAG, "This device supports Bluetooth.")
        }

        setSupportActionBar(binding.toolbarScan)

        supportActionBar?.let {
            it.setDisplayShowTitleEnabled(false)
            it.setDisplayHomeAsUpEnabled(true)
            it.setHomeAsUpIndicator(R.drawable.ic_keyboard_arrow_left_white_32dp)
        }
    }

    override fun onResume() {
        super.onResume()

        if (vm.isBluetoothOn()) {
            val enableBtIntent = Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT)

        } else {

            vm.startScan(SCAN_PERIOD)
        }
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        if (item.itemId == android.R.id.home) {
            vm.stopScan()
            finish()
            return true
        }
        return super.onOptionsItemSelected(item)
    }
}

如你所见，ScanCallback有一些日志。我已经看到了它肯定在logcat！！但现在，我只能看到这个日志。

但现在，我只能看到这个日志。

2020-05-29 00:42:55.895 21880-21880 D/ViewRootImpl@4646843[MainActivity]: ViewPostIme pointer 0
2020-05-29 00:42:56.054 21880-21880 D/ViewRootImpl@4646843[MainActivity]: ViewPostIme pointer 1
2020-05-29 00:42:56.092 21880-21880 W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@ae4800e
2020-05-29 00:42:56.111 21880-21880 I/MultiWindowDecorSupport: updateCaptionType >> DecorView@b569840[], isFloating: false, isApplication: true, hasWindowDecorCaption: false, hasWindowControllerCallback: true
2020-05-29 00:42:56.112 21880-21880 D/MultiWindowDecorSupport: setCaptionType = 0, DecorView = DecorView@b569840[]
2020-05-29 00:42:56.147 21880-21880 D/ScanActivity: This device supports Bluetooth.
2020-05-29 00:42:56.166 21880-21880 D/BluetoothAdapter: STATE_ON
2020-05-29 00:42:56.166 21880-21880 I/chatty: uid=10908(com.seoultech.livingtogether_android) identical 1 line
2020-05-29 00:42:56.167 21880-21880 D/BluetoothAdapter: STATE_ON
2020-05-29 00:42:56.168 21880-21880 D/BluetoothAdapter: BLE support array set: 010011
2020-05-29 00:42:56.168 21880-21880 D/BluetoothLeScanner: Start Scan with callback
2020-05-29 00:42:56.170 21880-21900 D/BluetoothLeScanner: onScannerRegistered() - status=0 scannerId=12 mScannerId=0
2020-05-29 00:42:56.175 21880-21880 D/ScanViewModel: Scan is started
2020-05-29 00:42:56.181 21880-21880 D/ViewRootImpl@e2f6c46[ScanActivity]: setView = com.android.internal.policy.DecorView@b569840 TM=true MM=false
2020-05-29 00:42:56.184 21880-21880 D/ViewRootImpl@4646843[MainActivity]: MSG_WINDOW_FOCUS_CHANGED 0 1
2020-05-29 00:42:56.185 21880-21880 D/InputMethodManager: prepareNavigationBarInfo() DecorView@b68fe3a[MainActivity]
2020-05-29 00:42:56.185 21880-21880 D/InputMethodManager: getNavigationBarColor() -855310
2020-05-29 00:42:56.200 21880-21880 D/ViewRootImpl@e2f6c46[ScanActivity]: Relayout returned: old=(0,0,1080,2220) new=(0,0,1080,2220) req=(1080,2220)0 dur=7 res=0x7 s={true 524632977408} ch=true
2020-05-29 00:42:56.201 21880-21925 D/OpenGLRenderer: createReliableSurface : 0x7a1deda640, 0x7a268ff000
2020-05-29 00:42:56.202 21880-21925 D/mali_winsys: EGLint new_window_surface(egl_winsys_display *, void *, EGLSurface, EGLConfig, egl_winsys_surface **, EGLBoolean) returns 0x3000
2020-05-29 00:42:56.217 21880-21929 D/FA: Connected to remote service
2020-05-29 00:42:56.234 21880-21880 D/ViewRootImpl@e2f6c46[ScanActivity]: MSG_WINDOW_FOCUS_CHANGED 1 1
2020-05-29 00:42:56.234 21880-21880 D/InputMethodManager: prepareNavigationBarInfo() DecorView@b569840[ScanActivity]
2020-05-29 00:42:56.234 21880-21880 D/InputMethodManager: getNavigationBarColor() -855310
2020-05-29 00:42:56.236 21880-21880 D/InputMethodManager: prepareNavigationBarInfo() DecorView@b569840[ScanActivity]
2020-05-29 00:42:56.236 21880-21880 D/InputMethodManager: getNavigationBarColor() -855310
2020-05-29 00:42:56.236 21880-21880 D/InputMethodManager: startInputInner - Id : 0
2020-05-29 00:42:56.236 21880-21880 I/InputMethodManager: startInputInner - mService.startInputOrWindowGainedFocus
2020-05-29 00:42:56.237 21880-21880 D/InputTransport: Input channel destroyed: 'ClientS', fd=84
2020-05-29 00:42:56.260 21880-21880 D/ViewRootImpl@e2f6c46[ScanActivity]: MSG_RESIZED: frame=(0,0,1080,2220) ci=(0,63,0,126) vi=(0,63,0,126) or=1
2020-05-29 00:42:56.543 21880-21925 W/libEGL: EGLNativeWindowType 0x7a1deda790 disconnect failed
2020-05-29 00:42:56.547 21880-21880 D/ViewRootImpl@4646843[MainActivity]: Relayout returned: old=(0,0,1080,2220) new=(0,0,1080,2220) req=(1080,2220)8 dur=4 res=0x5 s={false 0} ch=true
2020-05-29 00:42:56.550 21880-21880 D/ViewRootImpl@4646843[MainActivity]: stopped(true) old=false
2020-05-29 00:42:56.562 21880-21880 D/ViewRootImpl@4646843[MainActivity]: Relayout returned: old=(0,0,1080,2220) new=(0,0,1080,2220) req=(1080,2220)8 dur=4 res=0x5 s={false 0} ch=false
2020-05-29 00:43:02.899 21880-21886 I/ogether_androi: Compiler allocated 4162KB to compile void android.view.ViewRootImpl.performTraversals()
2020-05-29 00:43:06.185 21880-21880 D/BluetoothAdapter: STATE_ON
2020-05-29 00:43:06.187 21880-21880 D/BluetoothAdapter: STATE_ON
2020-05-29 00:43:06.187 21880-21880 D/BluetoothLeScanner: Stop Scan with callback
2020-05-29 00:43:06.194 21880-21880 D/ScanViewModel: Scan Timeout

没有日志，没有异常。所以我无法找到问题所在。

我重新执行了上次用git成功的代码，但结果还是一样。

我使用的是Android 10，然后和现在。

请帮帮我。

android kotlin bluetooth beacon
1个回答
0
投票

一些故障排除技巧。

  1. 你知道蓝牙设备在做广告吗？ Do you know that a bluetooth device is advertising? 尝试一个现成的应用程序，如 nRf连接 并确保检测到一个。

  2. 你的蓝牙协议栈是否处于不良状态？ 如果是，你可能无法检测到步骤1中的任何东西。 关闭和打开蓝牙，或者重新启动手机可能会解决这个问题。

  3. 您是否动态地请求并获得用户的位置权限？除非你这样做，否则你无法检测到信标。读取 此处.

  4. 如果你检查应用权限，是否确认你的应用已经被授予位置权限？进入设置 -> 应用程序 -> 您的应用程序并检查授予的权限。

  5. 在手机设置中是否打开了蓝牙？

  6. 在手机设置中是否打开了定位功能？

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