jihoon kim jihoon kim - 2 months ago 20
Android Question

RecyclerView IndexOutOfBoundsException

Why exception execute when I removed some items in RecyclerView by using loop ?
I used Collentions.synchronizedMap in adapter and 'deleteItem method' use synchronized too. (the method in fragment)

public void elementController(JsonObject jsonObject , String type) {
if ( jsonObject == null || type == null ) {
return;
}

int position =0 , resultPosition =0;
if ( type.equals("update") || type.equals("delete")) {

String id = jsonObject.get(ELEMENT_ID).getAsString();
Map<String , Element> map = gridFragment.getMap();

synchronized (map) {
for (String s : map.keySet()) {
if (s.equals(id)) {
resultPosition = position;
} else {
position++;
}
}
}
}

if(position-1 > gridFragment.getmAdapter().getData().size() || position <0) {
return;
}
switch (type) {
case "add":
if (gridFragment.addElement(MyJsonParser.ElementParse(jsonObject),0)){
LogUtils.logDebug(TAG,"add end");
}
break;
case "update":
if(gridFragment.updateElement( updateParser(jsonObject),resultPosition)){
LogUtils.logDebug(TAG,"update end");
}
break;
case "delete":
if(gridFragment.deleteElement(jsonObject.get(ELEMENT_ID).getAsString(),resultPosition)){
LogUtils.logDebug(TAG,"delete end");
}
break;
}
}





public boolean deleteElement(final String id , final int position){
new Thread(new Runnable() {
@Override
public void run() {
getActivity().runOnUiThread(new Runnable(){
@Override
public void run() {
synchronized (map) {
map.remove(id);
mAdapter.setData(map);
mAdapter.notifyItemRemoved(position);
}
}
});
}
}).start();

return true;
}


My error Log:

java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 0(offset:0).state:4
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3382)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3340)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1810)
at android.support.v7.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:356)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1269)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:523)
at android.support.v7.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:151)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:1942)
at android.support.v7.widget.RecyclerView.resumeRequestLayout(RecyclerView.java:1171)
at android.support.v7.widget.RecyclerView$1.run(RecyclerView.java:167)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:543)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5137)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:902)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:718)
at dalvik.system.NativeStart.main(Native Method)


device not found

Answer
 mAdapter.notifyItemRemoved(position); 

this only notifies the observers that are listening for layout changes.

Instead, try calling:

mAdpater.nofityDataChanged()
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