注释参数必须是一个编译时间常数-Kotlin

Question

我想在我的主动脉上从覆盖功能中发送一个参数，以在接口上使用，以每次我单击下拉列表时都会更改URL。

On my MainActivity i have:

before the class definition:

var item2:String="popular"
class MainActivity : AppCompatActivity(),AdapterView.OnItemClickListener {

on the same activity:

    override fun onItemClick(parent: AdapterView<*>?, view: View?, position: Int, id: Long)
{
    val item = parent?.getItemAtPosition(position).toString()
    item2=item

} 

and in the interface:

val get_url:String ="/3/movie/$item2?api_key=KEY_NUMBER"
interface MovieApiInterface {
    @GET(get_url)
    fun getMovieList(): Call<MovieResponse>

}

But there i have "An annotation argument must be a compile-time constant"

Don't understand why :(

Thanks

Answer 1

错误消息实际上是描述性的，您只能将编译时常数作为参数传递给注释，因此您需要替换

val get_url:String ="/3/movie/$item2?api_key=KEY_NUMBER"
interface MovieApiInterface {
    @GET(get_url)
    fun getMovieList(): Call<MovieResponse>

}

：

interface MovieApiInterface {
    @GET("/3/movie/$item2?api_key=KEY_NUMBER")
    fun getMovieList(): Call<MovieResponse>

}