Can'；t使用Android绑定在RecyclerView上绑定分级栏

我正在使用kotlin绑定放置在RecyclerView上的分级栏，但出现以下错误：

在android.widget.RatingBar上找不到参数类型为java.lang.Double的属性“app:ratingValue”的setter

我试着在不同的博客上设置分级栏的值，但我无法在适配器中实现它

下面是我的模型课：

@Entity(tableName = "Results")
class Result {

    companion object {

        @JvmStatic
        @BindingAdapter("ratingValue")
        fun setRating(ratingBar: RatingBar, mVoteAverage: Float) {
            if (mVoteAverage != null) {
                ratingBar.rating = mVoteAverage
                val stars = ratingBar.progressDrawable as LayerDrawable
                stars.getDrawable(2).setColorFilter(ContextCompat.getColor(ratingBar.context, R.color.rating_bar), PorterDuff.Mode.SRC_ATOP)
                val roundVal = Math.round(mVoteAverage!!)
                ratingBar.numStars = roundVal
            }

        }
    }

    constructor(mId: Long?, mOverview: String?, mPosterPath: String?, mTitle: String?, mVoteAverage: Double?) {
        this.mId = mId
        this.mOverview = mOverview
        this.mPosterPath = mPosterPath
        this.mTitle = mTitle
        this.mVoteAverage = mVoteAverage
    }

    constructor()

    @PrimaryKey
    @SerializedName("id")
    var mId: Long? = null
    @SerializedName("overview")
    var mOverview: String? = null
    @SerializedName("poster_path")
    var mPosterPath: String? = null
    @SerializedName("title")
    var mTitle: String? = null
    @SerializedName("vote_average")
    var mVoteAverage: Double? = null


}

然后，这是可绑定的XML布局：

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <data>

        <variable
            name="movie"
            type="com.movieapp.huxymovies.model.Result" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:background="@color/bg"
        android:orientation="vertical">

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:orientation="horizontal">

                        <RatingBar
                            android:id="@+id/rating_bar"
                            style="?android:attr/ratingBarStyleSmall"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginTop="9dp"
                            app:ratingValue="@{movie.mVoteAverage}"/>


                    </LinearLayout>


            </LinearLayout>
    </LinearLayout>
</layout>

这是我的适配器类：

class ResultAdapter(private val context: Context) : PagedListAdapter<Result, ResultAdapter.ResultViewHolder>(DIFF_CALLBACK) {

    public lateinit var mBinding: ItemActivitymainBinding

    override fun onBindViewHolder(holder: ResultViewHolder, position: Int) {

        val result = getItem(position)

        if (result != null) {

            holder.itemActivitymainBinding.movie = result
            holder.itemActivitymainBinding.ratingBar.rating = result.mVoteAverage as (Float)
            holder.itemActivitymainBinding.titleTxt.text = result.mTitle

        }
    }

    class ResultViewHolder(itemView: ItemActivitymainBinding) : RecyclerView.ViewHolder(itemView.root) {


        var itemActivitymainBinding: ItemActivitymainBinding
        var root: View

        init {
            root = itemView.root

            itemActivitymainBinding = itemView
        }
    }

    }
}

class ResultAdapter（私有值上下文：上下文）：PagedListAdapter（差异回调）{
公共lateinit变量mBinding:ItemActivitymainBinding
覆盖BindViewHolder（holder:ResultViewHolder，位置：Int）{
val结果=getItem（位置）
如果（结果！=null）{
holder.itemActivitymainBinding.movie=结果
holder.itemActivitymainBinding.ratingBar.rating=result.mVoteAverage as（浮动）
holder.itemActivitymainBinding.titleTxt.text=result.mTitle
}
}
类ResultViewHolder（itemView:ItemActivitymainBinding）：RecyclerView.ViewHolder（itemView.root）{
var itemActivitymainBinding:itemActivitymainBinding
变量根：视图
初始化{
root=itemView.root
itemActivitymainBinding=itemView
}
}
}
}

---

我想我在

onBindViewHolder（）

中缺少了一些东西，但是我找不到它，我缺少了什么？

您的

Result

类的

mVoteAverage:Double？

属性是

Double

。 您的

@BindingAdapter

方法有一个

Float

参数。这就是为什么绑定不起作用。改变

    @JvmStatic
    @BindingAdapter("ratingValue")
    fun setRating(ratingBar: RatingBar, mVoteAverage: Float)

到

我们应该做到这一点

    @JvmStatic
    @BindingAdapter("ratingValue")
    fun setRating(ratingBar: RatingBar, mVoteAverage: Double)