未解决的参考 getResources() Kotlin

Question

所以我试图在我的代码中访问 getResources()，但由于某种原因，它一直在获取未解析的引用。我正在为我的阵列适配器在另一个 class 中执行此操作。是我没有main方法还是其他原因？一般来说，我对 android dev 和 kotlin 有点陌生，所以如果有任何帮助，我将不胜感激。

class ForecastAdapter(val forecast: Forecast) : RecyclerView.Adapter<ForecastData>(){
    override fun getItemCount(): Int {
        return forecast.list.count()

    }

    override fun onCreateViewHolder(p0: ViewGroup, p1: Int): ForecastData {
        val layoutInflator = LayoutInflater.from(p0?.context)
        val cellForRow = layoutInflator.inflate(R.layout.weather_row, p0, false)
        return ForecastData(cellForRow)

    }

    override fun onBindViewHolder(p0: ForecastData, p1: Int) {
        val drawableId: Int = getResources().getIdentifier("my_drawable", "drawable", getPackageName())
        val getWeather = forecast.list[p1]
        val clouds = getWeather.weather[0]
        val getDateTime = forecast.list[p1]
        var getIcon = forecast.list[p1]
        var icon = getIcon.weather[0]
        p0.view.textView_text_clouds.text = clouds.main
        p0.view.textView_date_time.text = getDateTime.dt_txt

    }

}

class ForecastData(val view: View): RecyclerView.ViewHolder(view){


}

Answer 1

在您的适配器中将上下文作为参数传递，然后像这样使用

 class ForecastAdapter(val forecast: Forecast,val context:Context)

然后

 override fun onBindViewHolder(p0: ForecastData, p1: Int) {
    val drawableId: Int = context.getResources().getIdentifier("my_drawable", "drawable", getPackageName())

Answer 2

您不需要通过构造函数传递它。在 onCreateViewHolder 你可以从 parent.context

Answer 3

您可以使用 ContextCompat。

ContextCompat.getColor(this.applicationContext, android.R.color.transparent)

未解决的参考 getResources() Kotlin

Unresolved Reference getResources() Kotlin

android

kotlin

android-arrayadapter

custom-arrayadapter