Question

我正在尝试检测当前视图在回收视图中是否可见。使用布局管理器的isViewPartiallyVisible方法，我可以传入视图并查看它是否部分可见。当我将Textview传递给方法时，我得到一个类强制转换异常： android.widget.LinearLayout$LayoutParams cannot be cast to android.support.v7.widget.RecyclerView$LayoutParams

所以我在所有引用和xml布局中将Textview更改为AppCompatTextView，以使库版本与recycleviews匹配。我仍然得到同样的错误。

编辑---这是调用方法

import android.support.v7.widget.RecyclerView
import android.support.v7.widget.AppCompatTextView    
....
private fun withinView(wk_predictionTV: WeakReference<AppCompatTextView>, recyclerView: RecyclerView): Boolean {
        try {
            return recyclerView.layoutManager.isViewPartiallyVisible(predictionTV.get()!!, false, true)
        } catch (e: Exception) {
            Timber.e("Failed:${e.printStackTrace()}")
        }
        return true
    }

list_view

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >

    <android.support.v7.widget.AppCompatEditText
        android:id="@+id/train_list_filter_edtext"
        android:layout_width="match_parent"
        android:layout_height="64dp"
        android:hint="Enter Station Name"
        android:inputType="text" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:scrollbars="vertical">

</android.support.v7.widget.RecyclerView>
</LinearLayout>

row.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <com.github.captain_miao.optroundcardview.OptRoundCardView
            android:id="@+id/top_card_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/trainlist_side_margins"
            android:layout_marginRight="@dimen/trainlist_side_margins"
            android:layout_marginTop="@dimen/trainlist_card_margins"
            android:paddingTop="0dp"
            app:optRoundCardCornerRadius="8dp"
            app:optRoundCardLeftBottomCorner="false"
            app:optRoundCardLeftTopCorner="true"
            app:optRoundCardRightBottomCorner="false"
            app:optRoundCardRightTopCorner="true"
            >

            ..
        </com.github.captain_miao.optroundcardview.OptRoundCardView>
    </LinearLayout>

有什么想法吗？

ClassCastException：android.widget.LinearLayout $ LayoutParams无法强制转换为android.support.v7.widget.RecyclerView $ LayoutParams

0 个答案: