Kotlin 如何修复错误';java.lang.IllegalStateException:RecyclerView不能为null';
我有一个recyclerView,在那里我用适配器发送数据,但出现了错误Kotlin 如何修复错误';java.lang.IllegalStateException:RecyclerView不能为null';,kotlin,android-recyclerview,linearlayoutmanager,Kotlin,Android Recyclerview,Linearlayoutmanager,我有一个recyclerView,在那里我用适配器发送数据,但出现了错误 RecyclerView不能为空 使用我的adpater编码: class InWaitingFragment : Fragment() { private lateinit var adapter: FastItemAdapter<BarterWaitingItem> override fun onCreateView( inflater: LayoutInflater,
RecyclerView不能为空
使用我的adpater编码:
class InWaitingFragment : Fragment() {
private lateinit var adapter: FastItemAdapter<BarterWaitingItem>
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
println("CONTAINER: " + container)
val inflate: FrameLayout = inflater.inflate(R.layout.fragment_in_waiting, container, false) as FrameLayout
adapter = FastItemAdapter<BarterWaitingItem>()
waitingRecyclerView.layoutManager = LinearLayoutManager(this)
waitingRecyclerView.adapter = adapter
val retrofit = Retrofit.Builder()
.baseUrl("http://10.93.182.95:8888")
.addConverterFactory(GsonConverterFactory.create())
.build()
val service = retrofit.create(RequestManager::class.java)
val action = service.getPending()
action.enqueue(object: Callback<ArrayList<GetBarterResponse>> {
override fun onResponse(
call: Call<ArrayList<GetBarterResponse>>,
response: Response<ArrayList<GetBarterResponse>>
) {
val allBarter = response.body()
if(allBarter != null){
for (c in allBarter){
println("OBJET: ${c.buyer_object.title}")
}
println("ONRESPONSE En attente: " + response.body().toString())
}
}
override fun onFailure(call: Call<ArrayList<GetBarterResponse>>, t: Throwable) {
println("ONFAILURE En attente: " + t.toString())
}
})
return inflate
}
}
您应该将
LinearLayoutManager(this)
更改为LinearLayoutManager(this.context)
您应该将LinearLayoutManager(this)
更改为LinearLayoutManager(this.context)
对于您的LinearLayoutManager,片段没有扩展上下文,因此您不能将这
用作参数。相反,请使用以下命令:
waitingRecyclerView.layoutManager = LinearLayoutManager(context!!)
对于运行时错误,“RecyclerView不得为null”,这是因为您正在访问onCreateView
回调中的waitingRecyclerView
属性。布局尚未初始化。您可以将waitingRecyclerView
的初始化移动到“onViewCreated”回调
如果必须在创建视图中初始化waitingRecyclerView
内部waitingRecyclerView
,则可以通过展开布局时创建的对象访问waitingRecyclerView
:
inflate.waitingRecyclerView.layoutManager = LinearLayoutManager(context!!)
inflate.waitingRecyclerView.adapter = adapter
对于LinearLayoutManager,片段没有扩展上下文,因此不能使用
此
作为参数。相反,请使用以下命令:
waitingRecyclerView.layoutManager = LinearLayoutManager(context!!)
对于运行时错误,“RecyclerView不得为null”,这是因为您正在访问onCreateView
回调中的waitingRecyclerView
属性。布局尚未初始化。您可以将waitingRecyclerView
的初始化移动到“onViewCreated”回调
如果必须在创建视图中初始化waitingRecyclerView
内部waitingRecyclerView
,则可以通过展开布局时创建的对象访问waitingRecyclerView
:
inflate.waitingRecyclerView.layoutManager = LinearLayoutManager(context!!)
inflate.waitingRecyclerView.adapter = adapter