override fun onCreate()

in perf/app/src/main/java/com/google/firebase/quickstart/perfmon/kotlin/MainActivity.kt [42:86]
37 lines of code
3 McCabe index (conditional complexity)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        binding.button.setOnClickListener {
            // write 40 chars of random text to file
            val contentFile = File(this.filesDir, CONTENT_FILE)

            writeStringToFile(contentFile.absolutePath, "${getRandomString(40)}\n")
                    .addOnCompleteListener { task ->
                        if (!task.isSuccessful) {
                            Log.e(TAG, "Unable to write to file", task.exception)
                            return@addOnCompleteListener
                        }

                        loadFileFromDisk()
                    }
        }

        // Begin tracing app startup tasks.
        trace = Firebase.performance.newTrace(STARTUP_TRACE_NAME)
        Log.d(TAG, "Starting trace")
        trace.start()
        loadImageFromWeb()
        // Increment the counter of number of requests sent in the trace.
        Log.d(TAG, "Incrementing number of requests counter in trace")
        trace.incrementMetric(REQUESTS_COUNTER_NAME, 1)
        loadFileFromDisk()
        // Wait for app startup tasks to complete asynchronously and stop the trace.
        Thread(Runnable {
            try {
                numStartupTasks.await()
            } catch (e: InterruptedException) {
                Log.e(TAG, "Unable to wait for startup task completion.")
            } finally {
                Log.d(TAG, "Stopping trace")
                trace.stop()
                runOnUiThread {
                    Toast.makeText(this, "Trace completed",
                            Toast.LENGTH_SHORT).show()
                }
            }
        }).start()
    }