Get the Device serial number for all versions of android

DeviceInfo.kt

fun getDeviceSerial(applicationContext: Context): String? {

    var serialNumber: String?

    try {
        val c = Class.forName("android.os.SystemProperties")
        val get = c.getMethod("get", String::class.java)

        serialNumber = get.invoke(c, "gsm.sn1") as String

        when (serialNumber) {
            "" -> serialNumber = get.invoke(c, "ril.serialnumber") as String
        }

        when (serialNumber) {
            "" -> serialNumber = get.invoke(c, "ro.serialno") as String
        }

        when (serialNumber) {
            "" -> serialNumber = get.invoke(c, "sys.serialnumber") as String
        }

        @Suppress("DEPRECATION")
        when (serialNumber) {
            "" -> serialNumber = Build.SERIAL
        }

        when (serialNumber) {
            "" -> serialNumber = null
        }

    } catch (e: Exception) {
        e.printStackTrace()
        Toast.makeText(applicationContext, e.message, Toast.LENGTH_LONG).show()
        serialNumber = null
    }

    if (serialNumber == "unknown") {
        try {
            val c = Class.forName("android.os.SystemProperties")
            val get = c.getMethod(
                "get",
                String::class.java,
                String::class.java
            )
            serialNumber = get.invoke(c, "ril.serialnumber", "unknown") as String
        } catch (ignored: Exception) {
            Timber.d("BuildSerialException getDeviceSerial: $ignored")
            Toast.makeText(applicationContext, "ignored ${ignored.message}", Toast.LENGTH_LONG)
                .show()
        }
    }

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && serialNumber == "unknown") {
        if (ActivityCompat.checkSelfPermission(
                applicationContext,
                Manifest.permission.READ_PHONE_STATE
            ) == PackageManager.PERMISSION_GRANTED
        ) {
            serialNumber = Settings.Secure.getString(
                applicationContext.contentResolver,
                Settings.Secure.ANDROID_ID
            )
        }
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && serialNumber == "unknown") {
        if (ActivityCompat.checkSelfPermission(
                applicationContext,
                Manifest.permission.READ_PHONE_STATE
            ) == PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(
                applicationContext,
                Manifest.permission.READ_PRECISE_PHONE_STATE
            ) == PackageManager.PERMISSION_GRANTED
        ) {
            serialNumber = Build.getSerial()
        }
    }
    return serialNumber
}