如何ArrayList在Kotlin中添加项目？
我尝试了下面提到的这个代码,但在运行时遇到崩溃.发生的错误是Android运行时:
致命异常:主要进程:com.root.specialbridge,PID:17706 kotlin.KotlinNullPointerException at com.root.specialbridge.fragments.profile_fragment.WallFragments.initializeView(WallFragments.kt:49)
class WallFragments : Fragment(){
private var wallAdapter: WallAdapter? = null
private var wall_recycler: RecyclerView? = null
private val wallArrayList: ArrayList<Wall>? = null
private var mainlayout: LinearLayout? = null
private var no_result_found_layout: RelativeLayout? = null
private var userProfileWallInterface: UserProfileWallInterface? = null
internal var wallActivityBeanse: MutableList<WallActivityBeans> = ArrayList()
override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater!!.inflate(R.layout.wall_fragments, container, false)
userProfileWallInterface = UserProfileWallPresentation(activity, this)
initializeView()
wallAdapter = WallAdapter(activity, wallActivityBeanse)
wall_recycler!!.adapter = wallAdapter
return …我是kotlin编程语言的新手,如何在android中使用基本适配器在kotlin中实现列表视图.任何人都可以帮助我.