当RecyclerView在对话框中时，不显示Divider

Question

    myAdapter = MyAdapter();
    var lm = LinearLayoutManager(this.context)
    myRecyclerView.layoutManager = lm;
    myRecyclerView.adapter = myAdapter;
    var line = DividerItemDecoration(this.context, lm.orientation);
    myRecyclerView.addItemDecoration(line);

class MyDialogue:Dialog
{
    constructor(context: Context?) : super(context)
    {
        setContentView(R.layout.my_dialogue);
        window.setLayout(
                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

        //That code above.
    }

val a = context!!.theme.obtainStyledAttributes(
               R.style.AppTheme, intArrayOf(android.R.attr.listDivider));
val attributeResourceId = a.getResourceId(0, 0)
val drawable = context.getDrawable(attributeResourceId)
line.setDrawable(drawable);
a.recycle();

Answer 1

ListDivider在默认对话框主题中设置为null，这可能是因为AlertDialog列表不应该有分隔符。您可以通过将不同的主题传递给DividerItemDecory来重写特定对话框。所以不是：

DividerItemDecoration(this.context, lm.orientation)

使用此：

DividerItemDecoration(ContextThemeWrapper(this.context, R.style.AppTheme), lm.orientation)

其中AppTheme是应用程序的整体主题。