【Android】電池残量の取得【kotlin】 - Qiita

private val batteryStatus: Intent? = IntentFilter(Intent.ACTION_BATTERY_CHANGED).let { ifilter -> this.registerReceiver(null, ifilter) } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val textView: TextView = findViewById(R.id.text_view) val battery: Int? = batteryStatus?.getIntExtra(BatteryManager.EXTRA_LEVEL,-1) text