Delete item in arrayList, java.lang.UnsupportedOperationException

Question

I want to remove an item in a select location array list

My code

List<String> historylist = Arrays.asList(history); if (historylist.size()>=3){ System.out.print("*************************************************"); Log.i(MyContants.StoredHistory_TAG,"StoredHistory size========="+ String.valueOf(historylist.size())); String removePosition=historylist.get(2); historylist.remove(removePosition); } 

but I got an UnsupportedOperationException

error

  12-20 09:16:27.680: I/StoredHistory Class(5715): StoredHistory size=========3 12-20 09:16:27.680: D/AndroidRuntime(5715): Shutting down VM 12-20 09:16:27.684: W/dalvikvm(5715): threadid=1: thread exiting with uncaught exception (group=0x4001d7d0) 12-20 09:16:27.688: E/AndroidRuntime(5715): FATAL EXCEPTION: main 12-20 09:16:27.688: E/AndroidRuntime(5715): java.lang.RuntimeException: Unable to start activity ComponentInfo{****PACKAGE NAME*****}: java.lang.UnsupportedOperationException 12-20 09:16:27.688: E/AndroidRuntime(5715): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 12-20 09:16:27.688: E/AndroidRuntime(5715): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 12-20 09:16:27.688: E/AndroidRuntime(5715): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 12-20 09:16:27.688: E/AndroidRuntime(5715): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 12-20 09:16:27.688: E/AndroidRuntime(5715): at android.os.Handler.dispatchMessage(Handler.java:99) 12-20 09:16:27.688: E/AndroidRuntime(5715): at android.os.Looper.loop(Looper.java:123) 12-20 09:16:27.688: E/AndroidRuntime(5715): at android.app.ActivityThread.main(ActivityThread.java:4627) 12-20 09:16:27.688: E/AndroidRuntime(5715): at java.lang.reflect.Method.invokeNative(Native Method) 12-20 09:16:27.688: E/AndroidRuntime(5715): at java.lang.reflect.Method.invoke(Method.java:521) 12-20 09:16:27.688: E/AndroidRuntime(5715): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858) 12-20 09:16:27.688: E/AndroidRuntime(5715): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 12-20 09:16:27.688: E/AndroidRuntime(5715): at dalvik.system.NativeStart.main(Native Method) 12-20 09:16:27.688: E/AndroidRuntime(5715): Caused by: java.lang.UnsupportedOperationException 12-20 09:16:27.688: E/AndroidRuntime(5715): at java.util.AbstractList.remove(AbstractList.java:645) 12-20 09:16:27.688: E/AndroidRuntime(5715): at java.util.AbstractList$SimpleListIterator.remove(AbstractList.java:77) 12-20 09:16:27.688: E/AndroidRuntime(5715): at java.util.AbstractCollection.remove(AbstractCollection.java:230) 12-20 09:16:27.688: E/AndroidRuntime(5715): at ******.utills.StoredHistory.storedHistorylist(StoredHistory.java:24) 12-20 09:16:27.688: E/AndroidRuntime(5715): at *******.ScanResult.onCreate(ScanResult.java:53) 12-20 09:16:27.688: E/AndroidRuntime(5715): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 12-20 09:16:27.688: E/AndroidRuntime(5715): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 12-20 09:16:27.688: E/AndroidRuntime(5715): ... 11 more 

How to clear this problem. Advance thanx dude

Answer 1

Change

 List<String> historylist = Arrays.asList(history); 

to

  List<String> historylist = new LinkedList (Arrays.asList(history)); 

and see this post why this error occurs in the case of List:

Why can I get an UnsupportedOperationException when trying to remove an item from the list?

Answer 2

You cannot add or remove items from the list returned by Arrays.asList because the list is maintained by the original array. To create a list that you can change, you can do this:

 List<String> historylist = new ArrayList<String>(Arrays.asList(history)); 

Answer 3

I believe Arrays.asList () creates a fixed length and therefore does not support deletion.

Try using an implementation that supports deletion, such as an ArrayList.

Answer 4

try it

  list.set(position,obj);