ListViewAnimation insert() NullPointerException on notifyDataSetChanged()

ListViewAnimation 라이브러리를 사용 중이며 ListView에 대한 항목 추가 애니메이션을 수행하려고했습니다.ListViewAnimation insert() NullPointerException on notifyDataSetChanged()

단순히 어댑터가 삽입 가능을 구현하자,이 기능을 사용하고 DynamicListView에 삽입 방법 중 하나를 호출하려면 : 같은 애니메이션을 구현하기 위해

는 자신의 문서는 내가이 작업을 수행해야한다고 말한다

MyInsertableAdapter myAdapter = new MyInsertableAdapter(); // MyInsertableAdapter implements Insertable 
mDynamicListView.setAdapter(myAdapter); 
mDynamicListView.insert(0, myItem); // myItem is of the type the adapter represents.

그래서 여기에 내가 무슨 짓을했는지 :

내 목록보기 내 어댑터를 사용하기 위해 DynamicListView 수 (나는 ButterKnife을 사용하고 있습니다)하고 설정했다

@InjectView(R.id.flow_list) 
    DynamicListView mFlowList; 


    mFlowListAdapter = new FlowListAdapter(getActivity(), mItems); 
    mFlowList.setAdapter(mFlowListAdapter);

내 어댑터가 '삽입 가능한'인터페이스를 구현 제작하고 추상 메소드 오버라이드 (override) :

@Override 
public void add(int i, @NonNull Object o) { 
    Item newItem = (Item)o; 
    mList.add(Item); 
    notifyDataSetChanged(); 
}

전화 삽입()

@OnClick(R.id.done) 
void addItem() { 
    ... 
    mFlowList.insert(0,item); 
}

,536,913,632 10

하지만 내 응용 프로그램을 실행하고 내 ListView에의) (완료 버튼을 삽입을 유발하는 것을 클릭하면 내가 말하는 NullPointerException이있어 : 나는 notifyDataSetChanged에서 주석 때

09-15 11:51:41.046 14660-14660/com.jezer.MyApp E/AndroidRuntime﹕ FATAL EXCEPTION: main 
java.lang.NullPointerException 
     at com.nhaarman.listviewanimations.itemmanipulation.animateaddition.AnimateAdditionAdapter$HeightUpdater.onAnimationUpdate(AnimateAdditionAdapter.java:352) 
     at com.nineoldandroids.animation.ValueAnimator.animateValue(ValueAnimator.java:1178) 
     at com.nineoldandroids.animation.ValueAnimator.animationFrame(ValueAnimator.java:1139) 
     at com.nineoldandroids.animation.ValueAnimator.setCurrentPlayTime(ValueAnimator.java:545) 
     at com.nineoldandroids.animation.ValueAnimator.start(ValueAnimator.java:928) 
     at com.nineoldandroids.animation.ValueAnimator.start(ValueAnimator.java:951) 
     at com.nineoldandroids.animation.AnimatorSet.start(AnimatorSet.java:502) 
     at com.nineoldandroids.animation.AnimatorSet.start(AnimatorSet.java:502) 
     at com.nhaarman.listviewanimations.itemmanipulation.animateaddition.AnimateAdditionAdapter.getView(AnimateAdditionAdapter.java:318) 
     at android.widget.AbsListView.obtainView(AbsListView.java:2232) 
     at android.widget.ListView.measureHeightOfChildren(ListView.java:1253) 
     at android.widget.ListView.onMeasure(ListView.java:1162) 
     at android.view.View.measure(View.java:15775) 
     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681) 
     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) 
     at android.view.View.measure(View.java:15775) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4942) 
     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
     at android.view.View.measure(View.java:15775) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4942) 
     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
     at android.view.View.measure(View.java:15775) 
     at android.widget.LinearLayout.measureVertical(LinearLayout.java:850) 
     at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
     at android.view.View.measure(View.java:15775) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4942) 
     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2193) 
     at android.view.View.measure(View.java:15775) 
     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2212) 
     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1291) 
     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1486) 
     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1181) 
     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4942) 
     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776) 
     at android.view.Choreographer.doCallbacks(Choreographer.java:579) 
     at android.view.Choreographer.doFrame(Choreographer.java:548) 
     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762) 
     at android.os.Handler.handleCallback(Handler.java:800) 
     at android.os.Handler.dispatchMessage(Handler.java:100) 
     at android.os.Looper.loop(Looper.java:194) 
     at android.app.ActivityThread.main(ActivityThread.java:5391) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:525) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
     at dalvik.system.NativeStart.main(Native Method)

내가이 예외를받지 못했습니다() add() 메소드에서. 그러나 그것은 내가 listview를 새로 고치고 추가 애니메이션을 볼 수있는 유일한 방법입니다.

출처

2014-09-15 Jezer Crespo

'AnimateAdditionAdapter.java' 줄은 어떻게됩니까? github에서이 클래스를 찾을 수 없으며 여기에 있어야하는 것처럼 보입니다 : https://github.com/nhaarman/ListViewAnimations/tree/master/lib-manipulation/src/androidTest/java/com/nhaarman/listviewanimations/itemmanipulation/animateaddition – alfasin

layoutParams.height = (정수) animation.getAnimatedValue(); Src = https://github.com/nhaarman/ListViewAnimations/blob/master/lib-manipulation/src/main/java/com/nhaarman/listviewanimations/itemmanipulation/animateaddition/AnimateAdditionAdapter.java –

당신은 아마도이 일을하고 있습니까 대신이의 convertView = inflater.inflate(R.layout.cell, null);

를? convertView = inflater.inflate(R.layout.page_cell, parent, false);

출처

2015-02-07 03:07:38

ListViewAnimation insert() NullPointerException on notifyDataSetChanged()

답변

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