android - 如何在 Activity 类之外定义textview？

我有一个位置侦听器对象，我想知道如何在 Activity 类之外定义TextView。在LayoutInflater.from(context).inflate(R.layout.main, null)中，我获得了“上下文”和“主”的未解析引用。对于val locTextView = MainActivity.findViewById(R.id.locTextView) as TextView1我获得了findViewById的未解决参考。

private val locationListener: LocationListener = object : LocationListener {
    override fun onLocationChanged(location: Location) {
        val v = LayoutInflater.from(context).inflate(R.layout.main, null)
        val locTextView = MainActivity.findViewById(R.id.locTextView) as TextView
        locTextView.setText("" + location.longitude + ":" + location.latitude);
    }
    override fun onStatusChanged(provider: String, status: Int, extras: Bundle) {}
    override fun onProviderEnabled(provider: String) {}
    override fun onProviderDisabled(provider: String) {}
}

最佳答案

改变你的这一行

val v = LayoutInflater.from(context).inflate(R.layout.main, null)

与

val v = LayoutInflater.from(applicationContext).inflate(R.layout.main, null)

然后再次
改变你的

MainActivity.findViewById(R.id.locTextView) as TextView

与

 val locTextView =  findViewById< TextView>(R.id.locTextView)

更新

如果您想使用Kotlin Android Extention，那就告别findViewById()