蓝牙 LE - 如何设置自定义扫描延迟？

Question

我正在制作一个使用蓝牙 LE 扫描所有标签的应用程序。 我必须实现一个间隔功能，用户可以在其中输入扫描延迟秒数，但我还没有找到任何方法来这样做。 我尝试实施 TimerTask，但它仍然在一秒钟内扫描多个设备有什么方法可以实施间隔，例如每秒或更长时间扫描一个标签？

我的代码：

class BluetoothActivity : AppCompatActivity(), MenuProvider{
    
        private lateinit var recyclerView: RecyclerView
        private var bluetoothLeScanner: BluetoothLeScanner? = null
        private val deviceList = mutableListOf<BleTag>()
        private val deviceMap = mutableMapOf<String, BleTag>()
        private var interval: Long = 0
        private lateinit var menu: Menu
        private lateinit var tagBinding: ListbluethoothBinding
        val before = DateFormat.getDateTimeInstance().format(Date(System.currentTimeMillis()))
    
        private val scanCallback = object : ScanCallback(){
            @RequiresApi(Build.VERSION_CODES.N)
            @SuppressLint("MissingPermission", "NotifyDataSetChanged")
    
            override fun onScanResult(callbackType: Int, result: ScanResult) {
    
               val scanJob = CoroutineScope(Dispatchers.Main).launch {
                    val tag = deviceMap.computeIfAbsent(result.device.address) {
                        val newTag = BleTag(result.device.name ?: "Unbekannt", result.device.address, result.rssi , result.scanRecord?.bytes, "")
                        deviceList.add(newTag)
                        newTag
                    }
                    tag.name = result.device.name ?: "Unbekannt"
                    tag.rssi = result.rssi
                    tag.advertisementData = result.scanRecord?.bytes
                }
    
                deviceList.sortBy {result.rssi }
    
                menu.findItem(R.id.count).title = "Geräte: " + deviceList.size
    
                super.onScanResult(callbackType, result)
            }
    
            override fun onScanFailed(errorCode: Int) {
                super.onScanFailed(errorCode)
                Log.e("Scan failed","")
            }
        }
    
    
    
        @SuppressLint("MissingPermission")
        @RequiresApi(Build.VERSION_CODES.M)
        override fun onCreate(savedInstanceState: Bundle?) {
    
            super.onCreate(savedInstanceState)
    
            tagBinding = ListbluethoothBinding.inflate(layoutInflater)
            val view = tagBinding.root
            setContentView(view)
    
            recyclerView = tagBinding.list
    
            val layoutManager = LinearLayoutManager(this)
            recyclerView.layoutManager = layoutManager
            recyclerView.adapter = RecyclerViewAdapter(deviceList)
    
            addMenuProvider(this)
    
            val bluetoothManager: BluetoothManager = getSystemService(BluetoothManager::class.java)
            val bluetoothAdapter: BluetoothAdapter? = bluetoothManager.adapter
            bluetoothLeScanner = bluetoothAdapter?.bluetoothLeScanner
    
            interval = getSharedPreferences("interval", MODE_PRIVATE).getLong("interval", 1000)
    
            bluetoothLeScanner!!.startScan(scanCallback)
    
        }
    
    
        override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
            MainActivity@this.menu = menu
            menuInflater.inflate(R.menu.items, menu)
        }
    
        @RequiresApi(Build.VERSION_CODES.M)
        @SuppressLint("MissingPermission")
        override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
    
            when(menuItem.itemId) {
    
                R.id.stop -> {
                    bluetoothLeScanner!!.stopScan(scanCallback)
                    Snackbar.make(findViewById(android.R.id.content),"Scan gestoppt", 2000).show()
                }
                R.id.start -> {
                    bluetoothLeScanner!!.startScan(scanCallback)
                    Snackbar.make(findViewById(android.R.id.content),"Scan gestartet", 2000).show()
                }
            }
            return true
        }
    }

Answer 1

不幸的是 Android 没有给你这个粒度，值是在源代码中设置的，可以在这里看到。 在通过 API 进行设置方面，您唯一可以做的就是通过ScanSettings class 设置 SCAN_MODE_LOW_LATENCY 。

有些人已经找到了一些解决方法，您可以在下面的链接中找到这些方法：-

蓝牙 LE - 如何设置自定义扫描延迟？

问题描述

1 个解决方案

解决方案1
2 已采纳 2022-10-10 06:31:19

蓝牙 LE - 如何设置自定义扫描延迟？

问题描述

1 个解决方案

解决方案1 2 已采纳 2022-10-10 06:31:19

解决方案1
2 已采纳 2022-10-10 06:31:19