为什么我的android服务进程一启动就结束了？

Question

我正在尝试构建一个 Android 服务，该服务继续从我的 jetpack compose 应用程序进行蓝牙低功耗扫描，该应用程序与 ble 信标交互。我现在的目标只是在将应用程序置于后台后启动前台服务。我的代码编译后，跟踪进程的日志语句正常显示在我的 logcat 中，但服务进程在启动时就结束了，并且通知从未出现在状态栏上。

这是我的蓝牙服务类代码

@AndroidEntryPoint
class BluetoothScanService : Service() {

    @Inject lateinit var bluetoothUtils: BluetoothUtils
    @Inject lateinit var sharedDataManager: SharedDataManager
    @Inject lateinit var bleScanCallback: BleScanCallback

    override fun onCreate() {
        super.onCreate()
        // Initialize your BluetoothUtils, SharedDataManager, and ScanCallback here
        Log.i("foreground", "Inside onCreate in Bluetooth Service")

        val notification = createForegroundNotification()
        startForeground(1, notification)

        Log.i("foreground", "BluetoothUtils: $bluetoothUtils")
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        if (intent == null) {
            Log.e("foreground", "Received null intent in onStartCommand")
            return START_NOT_STICKY // or return an appropriate value
        }



        Log.i("foreground", "Inside onStartCommand in Bluetooth Service")
        // Start the Bluetooth scan in the foreground service
        bluetoothUtils.startScanning(bleScanCallback)

        return START_NOT_STICKY
    }

    private fun createForegroundNotification(): Notification {
        val channelId = "BluetoothScanChannel"
        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        // Create notification channel for Android 8.0 and above
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channel = NotificationChannel(
                channelId,
                "Bluetooth Scan",
                NotificationManager.IMPORTANCE_DEFAULT
            )
            notificationManager.createNotificationChannel(channel)
        }

        // Create the notification
        val notification = NotificationCompat.Builder(this, channelId)
            .setContentTitle("Bluetooth Scanning")
            .setContentText("Bluetooth scanning is running in the background.")
            //.setSmallIcon(R.drawable.ic_bluetooth)
            .build()

        return notification
    }

    override fun onBind(intent: Intent?): IBinder? {
        return null
    }
} 

这就是我从 MainActivity 中调用 onPause() 和 onResume() 中的服务的方式（我只有一个活动，因为我正在使用 Jetpack compose。我的应用程序中的每个屏幕都是可组合的）。

   override fun onPause(){
        super.onPause()
        Log.i("foreground", "Inside onPause in MainActivity")
        val intent = Intent(this, BluetoothScanService::class.java)
        Log.i("foreground", "the intent ${intent}")

        startService(intent)

    }
    override fun onResume() {
        super.onResume()
        Log.i("foreground", "Inside onResume in MainActivity")
        val intent = Intent(this, BluetoothScanService::class.java)
        stopService(intent)

    }

这是我的 logcat 结果

2025-01-21 13:49:32.544 32677-32677 foreground              com.myApp.bleApp              I  Inside onPause in MainActivity
2025-01-21 13:49:32.545 32677-32677 foreground              com.myApp.bleApp              I  the intent Intent { cmp=com.myApp.bleApp/.common.foregroundServices.BluetoothScanService }
2025-01-21 13:49:32.590 32677-32677 foreground              com.myApp.bleApp              I  Inside onCreate in Bluetooth Service
2025-01-21 13:49:32.691 32677-32677 foreground              com.myApp.bleApp              I  BluetoothUtils: com.myApp.bleApp.hardware.bluetooth.BluetoothUtils@7da3008
2025-01-21 13:49:32.693 32677-32677 foreground              com.myApp.bleApp              I  Inside onStartCommand in Bluetooth Service
---------------------------- PROCESS ENDED (32677) for package com.myApp.bleApp ----------------------------

如果我使用 return START_STICKY 而不是 return START_NOT_STICKY，该过程仍然会结束，但会以空意图重新启动，并且通知会出现在我的状态栏中。这些是我的 logcat 结果

2025-01-21 13:51:45.677  1960-1960  foreground              com.myApp.bleApp              I  Inside onPause in MainActivity
2025-01-21 13:51:45.678  1960-1960  foreground              com.myApp.bleApp              I  the intent Intent { cmp=com.myApp.bleApp/.common.foregroundServices.BluetoothScanService }
2025-01-21 13:51:45.739  1960-1960  foreground              com.myApp.bleApp              I  Inside onCreate in Bluetooth Service
2025-01-21 13:51:45.809  1960-1960  foreground              com.myApp.bleApp              I  BluetoothUtils: com.myApp.bleApp.hardware.bluetooth.BluetoothUtils@eaa3f16
2025-01-21 13:51:45.811  1960-1960  foreground              com.myApp.bleApp              I  Inside onStartCommand in Bluetooth Service
---------------------------- PROCESS ENDED (1960) for package com.myApp.bleApp ----------------------------
---------------------------- PROCESS STARTED (2496) for package com.myApp.bleApp ----------------------------
2025-01-21 13:51:49.731  2496-2496  foreground              com.myApp.bleApp              I  Inside onCreate in Bluetooth Service
2025-01-21 13:51:49.741  2496-2496  foreground              com.myApp.bleApp              I  BluetoothUtils: com.myApp.bleApp.hardware.bluetooth.BluetoothUtils@861bce1
2025-01-21 13:51:49.742  2496-2496  foreground              com.myApp.bleApp              E  Received null intent in onStartCommand

这是进程结束时出现的错误

致命异常：主要 进程：com.myApp.bleApp，PID：7298 java.lang.StackOverflowError：堆栈大小8188KB 在 com.myapp.bleApp.hardware.bluetooth.bleScanner.BleScanCallback.onScanFailed（BleScanCallback.kt：237）

这就是我的 bleScanCallback 类 onScanFailed(errorCode) 发生错误的地方

    override fun onScanFailed(errorCode: Int) {
        super.onScanFailed(errorCode)
        // Handle scan failure
        onScanFailed(errorCode)
    }

我现在唯一想要发生的事情是，当应用程序在后台时，服务保持活动状态，并且我希望看到通知出现在状态栏中。 我该如何解决这个问题？

Answer 1

这非常元！问题是函数正在调用自身并且可能处于无限循环中，这会导致 StackOverflowError。

    override fun onScanFailed(errorCode: Int) {
        super.onScanFailed(errorCode)
        // Handle scan failure
        onScanFailed(errorCode) // Do you really want to call recursively?
    }