Android 中 recyclerview 的自定义分隔线 colored颜色不起作用

发布于09月21日

以下代码根本不创建分隔符:

override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_notifications)

        val titleList = mutableListOf<NotificationsItem>()
        titleList.add(NotificationsItem("Title 1", "Description is good!", true))
        titleList.add(NotificationsItem("Title 2", "Description is good!", true))
        titleList.add(NotificationsItem("Title 3", "Description is good!", false))
        titleList.add(NotificationsItem("Title 4", "Description is good!", false))
        titleList.add(NotificationsItem("Title 5", "Description is good!", true))
        titleList.add(NotificationsItem("Title 6", "Description is good!", true))
        titleList.add(NotificationsItem("Title 7", "Description is good!", false))
        titleList.add(NotificationsItem("Title 8", "Description is good!", true))
        titleList.add(NotificationsItem("Title 9", "Description is good!", false))
        titleList.add(NotificationsItem("Title 10", "Description is good!", true))
        titleList.add(NotificationsItem("Title 11", "Description is good!", false))
        titleList.add(NotificationsItem("Title 12", "Description is good!", false))


        val recycler = findViewById<RecyclerView>(R.id.recyclerNotifications)
        recycler.adapter = NotificationsAdapter(titleList)
        recycler.layoutManager = LinearLayoutManager(this)

        val dividerItemDecoration = DividerItemDecoration(recycler.getContext(), LinearLayoutManager(this).orientation)
        dividerItemDecoration.setDrawable(ColorDrawable(recycler.getContext().resources.getColor(R.color.orange)))
        recycler.addItemDecoration(dividerItemDecoration)
    }

这将产生以下输出:

如果我删除 colored颜色更改，它将使用默认 colored颜色 :

val dividerItemDecoration = DividerItemDecoration(recycler.getContext(), LinearLayoutManager(this).orientation)
recycler.addItemDecoration(dividerItemDecoration)

为什么它不能适应 colored颜色的变化？

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(), DividerItemDecoration.VERTICAL); dividerItemDecoration.setDrawable(new ColorDrawable(ContextCompat.getColor(recyclerView.getContext(), android.R.color.holo_red_light)){ @Override public int getIntrinsicWidth(){ return getResources().getDisplayMetrics().widthPixels / getResources().getDisplayMetrics().densityDpi; } @Override public int getIntrinsicHeight(){ return (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1f, getResources().getDisplayMetrics()); } }); recyclerView.addItemDecoration(dividerItemDecoration);

val dividerItemDecoration = DividerItemDecoration(recyclerView.getContext(), DividerItemDecoration.VERTICAL) dividerItemDecoration.setDrawable(object : ColorDrawable(ContextCompat.getColor(recyclerView.getContext(), android.R.color.holo_red_light)) { override fun getIntrinsicWidth(): Int { return resources.displayMetrics.widthPixels / resources.displayMetrics.densityDpi } override fun getIntrinsicHeight(): Int { return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1f, resources.displayMetrics).toInt() } }) recyclerView.addItemDecoration(dividerItemDecoration)

val dividerItemDecoration = MaterialDividerItemDecoration(recyclerView.context, DividerItemDecoration.VERTICAL) dividerItemDecoration.setDividerColorResource(recyclerView.context, android.R.color.holo_red_light) recyclerView.addItemDecoration(dividerItemDecoration)

Android 中 recyclerview 的自定义分隔线 colored颜色不起作用

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