我想知道为什么会收到以下错误。
java.lang.IndexOutOfBoundsException: Invalid index 2, size is 2
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.modup.adapter.WorkoutCardsAdapter.getItem(WorkoutCardsAdapter.java:75)
at com.modup.fragment.CreateFragment$1.onPressed(CreateFragment.java:143)
at com.modup.adapter.WorkoutCardsAdapter$1.onClick(WorkoutCardsAdapter.java:62)
at android.view.View.performClick(View.java:4442)
at android.view.View$PerformClick.run(View.java:18473)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5105)
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:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
at dalvik.system.NativeStart.main(Native Method)
我在这个主题上看过很多帖子,但他们似乎都有相同的答案,在实施这些答案后,似乎问题仍然存在。
我的案例:
我有一个扩展ArrayAdapter<>的类,这个Adapter类用于填充片段中的ListView。一切正常,我可以添加视图,我可以删除视图(排序),我可以访问实现的回调。
问题: 似乎当我添加许多视图3-4 +并开始删除它们时,我最终会遇到此异常。
具体案例: 如果我从顶视图列表项开始,然后向下看,我似乎没有抛出错误,而且我有时也可以自下而上。如果我不按顺序删除视图(有时),似乎会出现错误。
如何解决此问题?我是否错误地覆盖了getCount()和getItem()?
更新:
检查mCallback.onPress(位置)的位置时;看起来好像列表中第一个项目的位置是0,只要我不尝试删除它下面的任何列表项,它就会保持为0。删除下面的列表项后,第一个列表项将具有完全不同的位置。
public class WorkoutCardsAdapter扩展了ArrayAdapter {
private LayoutInflater mInflater;
private String[] repArray, setArray, mgArray;
String TAG = WorkoutCardsAdapter.class.getCanonicalName();
Callback mCallback;
List<WorkoutView> mViews;
public WorkoutCardsAdapter(Context context, List<WorkoutView> views, Callback callback) {
super(context, 0, views);
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mCallback = callback;
this.mViews = views;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.single_workout_layout, parent, false);
holder = new ViewHolder();
holder.spinnerReps = (Spinner) convertView.findViewById(R.id.spinnerReps);
holder.spinnerSets = (Spinner) convertView.findViewById(R.id.spinnerSets);
holder.spinnerMuscleGroup = (Spinner) convertView.findViewById(R.id.spinnerWorkoutGroup);
holder.etWorkoutName = (EditText) convertView.findViewById(R.id.etWorkoutName);
holder.btnRemoveWorkout = (Button) convertView.findViewById(R.id.btnRemoveWorkout);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.btnRemoveWorkout.setTag(position);
mgArray = getContext().getResources().getStringArray(R.array.string_array_muscle_groups);
TextSpinnerAdapter adapter = new TextSpinnerAdapter(getContext(), R.layout.spinner_text_item, mgArray);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
holder.spinnerMuscleGroup.setAdapter(adapter);
setArray = getContext().getResources().getStringArray(R.array.string_array_sets);
TextSpinnerAdapter adapter1 = new TextSpinnerAdapter(getContext(), R.layout.spinner_text_item, setArray);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
holder.spinnerSets.setAdapter(adapter1);
repArray = getContext().getResources().getStringArray(R.array.string_array_reps);
TextSpinnerAdapter adapter2 = new TextSpinnerAdapter(getContext(), R.layout.spinner_text_item, repArray);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
holder.spinnerReps.setAdapter(adapter2);
holder.btnRemoveWorkout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = (Integer) v.getTag();
mCallback.onPressed(position);
}
});
return convertView;
}
@覆盖 public WorkoutView getItem(final int position){ return mViews.get(position); }
@Override
public int getCount() {
return mViews.size();
}
public interface Callback {
void onPressed(int pos);
}
private static class ViewHolder {
public Spinner spinnerMuscleGroup;
public Spinner spinnerSets;
public Spinner spinnerReps;
public EditText etWorkoutName;
public Button btnRemoveWorkout;
}
}
以下是带回调的适配器实现
mWorkoutCardsAdapter = new WorkoutCardsAdapter(getActivity(), mArrayList, new WorkoutCardsAdapter.Callback() {
@Override
public void onPressed(int pos) {
mWorkoutCardsAdapter.remove(mWorkoutCardsAdapter.getItem(pos));
mWorkoutCardsAdapter.notifyDataSetChanged();
}
});
如果有帮助,这就是按钮按
添加新视图的方法 workoutView = new WorkoutView(getActivity());
mWorkoutCardsAdapter.add(workoutView);
mWorkoutCardsAdapter.notifyDataSetChanged();
答案 0 :(得分:2)
我认为问题在于你没有使用相应的Button缓存正确的位置,因此被删除的项目混淆了。您可以将Button的标记设置为该位置,并从传递到onClick()
方法的View中检索它,以确保从列表中删除正确的。
holder.btnRemoveWorkout.setTag(position);
holder.btnRemoveWorkout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = (Integer) v.getTag();
mCallback.onPressed(position);
}
});