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[英]Use ArrayList of a RecyclerViewAdapter in another Activity
[英]RecyclerViewAdapter with ArrayList runtime error
我最近一直在進入 android 工作室,我遇到了 RecyclerViewAdapter 的問題。 我嘗試使用確實有效的List
,但不允許我刪除或添加該列表中的項目。 有沒有辦法解決這個問題,或者我應該改用 ViewModel 嗎?
我的相關代碼:
class recycledViewAdapter(private var itemmodellist: ArrayList<recycledviewitemmodel>): RecyclerView.Adapter<recycledViewAdapter.recycledViewHolder>() {
val recycledview = binding.recycledview
val list: ArrayList<recycledviewitemmodel> = ArrayList()
for (i in 1..10){
list.add(recycledviewitemmodel("item " + i.toString()))
}
val adapter = recycledViewAdapter(list)
recycledview.adapter = adapter
recycledview.layoutManager = LinearLayoutManager(this)
錯誤:
Process: com.example.recycleview, PID: 6955
java.lang.NoSuchMethodError: No direct method <init>(Ljava/util/List;)V in class Lcom/example/recycleview/recycledViewAdapter; or its super classes (declaration of 'com.example.recycleview.recycledViewAdapter' appears in /data/data/com.example.recycleview/code_cache/.overlay/base.apk/classes4.dex)
at com.example.recycleview.MainActivity.onCreate(MainActivity.kt:25)
at android.app.Activity.performCreate(Activity.java:8290)
at android.app.Activity.performCreate(Activity.java:8269)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1384)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3657)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3813)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2308)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7898)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
請以大寫字母開頭並使用駝峰命名所有類,例如:
class RecycledViewAdapter(
private var itemModelList: ArrayList<RecycledViewItemModel>
) : RecyclerView.Adapter<RecycledViewAdapter.RecycledViewHolder>() { ... }
重命名類后清理並重建項目。
首先,列表是不可變數據類型(僅限讀取模式),如果你想添加/刪除元素,你應該使用 mutableList。
其次,您應該在適配器內部聲明列表並使用一種方法來更新它。
class RecycledViewAdapter(): RecyclerView.Adapter<recycledViewAdapter.recycledViewHolder>() {
var itemList = listOf<RecycledVieWithModel>()
...
fun updateAdapter(newList: List<RecycledVieWithModel>){
itemList = newList.toList()
notifyDataSetChanged()
}
...
}
你應該將它初始化為:
val adapter = RecycledViewAdapter()
現在您可以隨時更新內容列表,而無需實例化適配器。
adapter.updateAdapter(listOf()) // your elements
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