listener-bandera.kt

spinnerCategoriasReporteGastos.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
    override fun onNothingSelected(parent: AdapterView<*>?) {
        Toast.makeText(context!!, "onNothingSelected", Toast.LENGTH_SHORT).show()
    }

    override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
        if (!banderaListener) {
            banderaListener = true
            return
        }
        // A partir de acá, podemos asumir que la llamada es genuina y generada por el usuario
        Toast.makeText(context!!, "onItemSelected position: $position. id: $id", Toast.LENGTH_SHORT).show()
    }
}