我有Android Studio中

public boolean onOptionsItemSelected(MenuItem item){ 
int id = item.getItemId(); 

switch(id){ 
    case R.id.jaren_3de: 
     updateKlassenList(klassen); 
     break; 
    case R.id.jaren_4de: 
     updateKlassenList(klassen2); 
     break; 
    case R.id.jaren_5de: 
     updateKlassenList(klassen3); 
     break; 
    case R.id.jaren_6de: 
     updateKlassenList(klassen4); 
     break; 

    // case R.id. 

} 

return super.onOptionsItemSelected(item); 
} 

private void updateKlassenList(String[] data) { 
    klassenList.clear(); 
    klassenList.addAll(Arrays.asList(data)); 

    // I assume "adapter" is the adapter of interest. 
    adapter.notifyDataSetChanged(); 
}

一個java.lang.unsupportedoperationexception我添加的方法：我有Android Studio中

private void updateKlassenList(String[] data) { 
    klassenList.clear(); 
    klassenList.addAll(Arrays.asList(data)); 

    // I assume "adapter" is the adapter of interest. 
    adapter.notifyDataSetChanged(); 
}

來解決前一個問題（見How to change List<String> value inside onOptionsItemSelected in Android Studio?），但現在我得到一個java.lang中。 UnsupportedOperationsException。我一直在尋找它，似乎它與過時的版本有關，但我最近更新了一切。

提前致謝！

編輯：這是我得到的錯誤：

01-10 16:08:23.508 1457-1457/com.geesplit.lessenrooster E/AndroidRuntime: FATAL EXCEPTION: main 
                     Process: com.geesplit.lessenrooster, PID: 1457 
                     java.lang.UnsupportedOperationException 
                      at java.util.AbstractList.remove(AbstractList.java:638) 
                      at java.util.AbstractList$SimpleListIterator.remove(AbstractList.java:75) 
                      at java.util.AbstractList.removeRange(AbstractList.java:658) 
                      at java.util.AbstractList.clear(AbstractList.java:466) 
                      at com.geesplit.lessenrooster.MainActivity.updateKlassenList(MainActivity.java:112) 
                      at com.geesplit.lessenrooster.MainActivity.onOptionsItemSelected(MainActivity.java:95) 
                      at android.app.Activity.onMenuItemSelected(Activity.java:2885) 
                      at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:1133) 
                      at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:761) 
                      at com.android.internal.view.menu.SubMenuBuilder.dispatchMenuItemSelected(SubMenuBuilder.java:81) 
                      at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152) 
                      at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:904) 
                      at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:894) 
                      at com.android.internal.view.menu.MenuPopupHelper.onItemClick(MenuPopupHelper.java:186) 
                      at android.widget.AdapterView.performItemClick(AdapterView.java:305) 
                      at android.widget.AbsListView.performItemClick(AbsListView.java:1146) 
                      at android.widget.AbsListView$PerformClick.run(AbsListView.java:3053) 
                      at android.widget.AbsListView.onTouchUp(AbsListView.java:3872) 
                      at android.widget.AbsListView.onTouchEvent(AbsListView.java:3637) 
                      at android.view.View.dispatchTouchEvent(View.java:8471) 
                      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2399) 
                      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2092) 
                      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) 
                      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) 
                      at android.widget.PopupWindow$PopupViewContainer.dispatchTouchEvent(PopupWindow.java:1731) 
                      at android.view.View.dispatchPointerEvent(View.java:8666) 
                      at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123) 
                      at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989) 
                      at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544) 
                      at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597) 
                      at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563) 
                      at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680) 
                      at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571) 
                      at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737) 
                      at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544) 
                      at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597) 
                      at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563) 
                      at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571) 
                      at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544) 
                      at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5807) 
                      at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5781) 
                      at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5752) 
                      at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5897) 
                      at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) 
                      at android.os.MessageQueue.nativePollOnce(Native Method) 
                      at android.os.MessageQueue.next(MessageQueue.java:143) 
                      at android.os.Looper.loop(Looper.java:122) 
                      at android.app.ActivityThread.main(ActivityThread.java:5257) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:372) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

來源

2016-01-10 GeeSplit

請發佈整個堆棧跟蹤以及觸發堆棧跟蹤的Java代碼。 – CommonsWare

「List」的類型不支持刪除 - 您使用的是不可修改的列表嗎？記錄'klassenList'類併發布結果。 –

我想通了，多虧了這個線程：Why do I get an UnsupportedOperationException when trying to remove an element from a List? 我用一個LinkedList，而不是一個普通的名單，現在，它的作品！

來源

2016-01-10 17:16:47 GeeSplit

好，這個答案對別人有用。您應該將其標記爲已接受！ – Shlublu

我需要等待2天，然後將自己的答案標記爲已接受，我已經嘗試過了:) – GeeSplit

啊好吧，我不知道（或我忘了）:) – Shlublu

我才知道，我用這個不用初始化，所以我初始化這樣的：

//globadl varaible: 
private List<ModelClass> ModelDataList; 

//code where Used this List. 
DataList = new LinkedList<>();

這解決了我的問題。

來源

2018-01-30 12:39:39

我有Android Studio中

回答

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