Question

我正在使用Big Nerd Ranch的ExpandableRecyclerView，就像这个example中的那个。问题是每当我尝试动态地向我的RecyclerView添加另一个子项时，这个新项目的空间占据了已经存在的项目的空间，有点像从屏幕上删除这个项目。我不知道如何更好地解释它，所以我附上了以下截图：

上图显示了添加新子项之前的列表。当我单击添加按钮时，我需要折叠子视图，然后再次展开它，使其显示如下：

New Item视图按下其他子视图，占用Item 2的空间。如果我尝试将新子项添加到最后一个父项，则会出现此错误：

E/AndroidRuntime: FATAL EXCEPTION: main
                                                Process: com.dietando.gabriel.dietando, PID: 4037
                                                                         java.lang.IndexOutOfBoundsException: Invalid index 8, size is 8
                                                                             at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
                                                                             at java.util.ArrayList.remove(ArrayList.java:403)
                                                                             at com.bignerdranch.expandablerecyclerview.Adapter.ExpandableRecyclerAdapter.expandParent(ExpandableRecyclerAdapter.java:319)
                                                                             at com.bignerdranch.expandablerecyclerview.Adapter.ExpandableRecyclerAdapter.onParentItemClickListener(ExpandableRecyclerAdapter.java:252)
                                                                             at com.bignerdranch.expandablerecyclerview.ViewHolder.ParentViewHolder.onClick(ParentViewHolder.java:200)
                                                                             at android.view.View.performClick(View.java:5198)
                                                                             at android.view.View$PerformClick.run(View.java:21147)
                                                                             at android.os.Handler.handleCallback(Handler.java:739)
                                                                             at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                             at android.os.Looper.loop(Looper.java:148)
                                                                             at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                             at java.lang.reflect.Method.invoke(Native Method)
                                                                             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

当我添加新子项时，我将新项添加到我的数组列表中，然后调用方法notifyDataSetChanged()。

这是我的适配器代码：

    public class MealExpandableAdapter extends ExpandableRecyclerAdapter<MealParentViewHolder, MealChildViewHolder>
{
    private Context context;
    private List<ParentObject> refeicoes;
    private boolean[] checkedState;
    private LayoutInflater mInflater;
    private MealExpandableAdapter.MealChildViewHolderListener onChildCheckChangedListener;

    public interface MealChildViewHolderListener
    {
        public void onCheckChange(int mealNumber, Food food, boolean selected);
    }

    public MealExpandableAdapter(Context context, List<ParentObject> refeicoes)
    {
        super(context, refeicoes);

        this.context = context;
        this.refeicoes = refeicoes;
        mInflater = LayoutInflater.from(context);

        checkedState = new boolean[refeicoes.size()];

        for(int i = 0; i < checkedState.length; ++i)
            checkedState[i] = false;


    }

    protected void setOnChilCheckedChangedListener(MealExpandableAdapter.MealChildViewHolderListener onChildCheckChangedListener)
    {
        this.onChildCheckChangedListener = onChildCheckChangedListener;
    }

    @Override
    public MealParentViewHolder onCreateParentViewHolder(ViewGroup viewGroup)
    {
        View view = mInflater.inflate(R.layout.adapter_refeicao, viewGroup, false);
        return new MealParentViewHolder(view);
    }

    @Override
    public MealChildViewHolder onCreateChildViewHolder(ViewGroup viewGroup)
    {
        View view = mInflater.inflate(R.layout.adapter_refeicao_child, viewGroup, false);
        return new MealChildViewHolder(view);
    }

    @Override
    public void onBindParentViewHolder(MealParentViewHolder mealParentViewHolder, final int mealNumber, Object parentObject)
    {
        final Meal meal = (Meal) parentObject;
        mealParentViewHolder.mMealParentTextView.setText(meal.getNome());
        mealParentViewHolder.mMealParentImageButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i("Teste", "img btn click");
                meal.addFood(0, new Food("New item", 30, 30, 30));
                //notify();
                //notifyItemInserted(mealNumber);
                notifyDataSetChanged();
                notifyItemChanged(mealNumber);


            }
        });

    }

    @Override
    public void onBindChildViewHolder(final MealChildViewHolder mealChildViewHolder, final int mealNumber, Object childObject)
    {
        //final Meal meal = (Meal) refeicoes.get(mealNumber);
        final Food food = (Food) childObject;
        mealChildViewHolder.mMealChildTextView.setText(food.getName());
        mealChildViewHolder.mMealChildCheckBox.setChecked(food.isChecked());
        mealChildViewHolder.mMealChildCheckBox.setChecked(food.isChecked());
        mealChildViewHolder.mMealChildCheckBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (((CheckBox) v).isChecked()) {
                    Log.i("Teste", "checked");
                    food.checkFood();
                    onChildCheckChangedListener.onCheckChange(mealNumber, food, true);
                } else {
                    Log.i("Teste", "unchecked");
                    food.checkFood();
                    onChildCheckChangedListener.onCheckChange(mealNumber, food, false);
                }
            }

        });
    }

这是我的ParentViewHolder：

    public class MealParentViewHolder extends ParentViewHolder
{
    public TextView mMealParentTextView;
    public ImageButton mMealParentImageButton;
    public CheckBox mMealParentCheckBox;

    public MealParentViewHolder(View itemView)
    {
        super(itemView);

        mMealParentTextView = (TextView) itemView.findViewById(R.id.tTitle);
        mMealParentImageButton = (ImageButton) itemView.findViewById(R.id.imgBtnParent);
        mMealParentCheckBox = (CheckBox) itemView.findViewById(R.id.checkBox);
    }
}

这是我的ChildViewHolder

    public class MealChildViewHolder extends ChildViewHolder
{
    public TextView mMealChildTextView;
    public CheckBox mMealChildCheckBox;



    public MealChildViewHolder(View itemView)
    {
        super(itemView);


        mMealChildTextView = (TextView) itemView.findViewById(R.id.txtFragMeal);
        mMealChildCheckBox = (CheckBox) itemView.findViewById(R.id.checkBoxFragMeal);
        mMealChildCheckBox.setChecked(false);
        mMealChildCheckBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (((CheckBox) v).isChecked()) {
                    Log.i("Teste", "checked");

                } else {


                }
            }
        });
    }
}

这就是我在片段中正在使用ViewHolder的方式：

RecyclerView recyclerView = (RecyclerView) getView().findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

        meals = user.getDiet().getMeals();

        MealExpandableAdapter mMealExpandableAdapter = new MealExpandableAdapter(getActivity(), meals);
        mMealExpandableAdapter.setOnChilCheckedChangedListener(onChildCheckChangedListener());
        // mCrimeExpandableAdapter.setCustomParentAnimationViewId(R.id.parent_list_item_expand_arrow);
        mMealExpandableAdapter.setParentClickableViewAnimationDefaultDuration();
        mMealExpandableAdapter.setParentAndIconExpandOnClick(true);


        recyclerView.setAdapter(mMealExpandableAdapter);

我认为问题在于适配器，但我不知道出了什么问题，我很感激任何帮助。

Answer 1

我打赌这个问题就在这条线上：

checkedState = new boolean[refeicoes.size()];

数组是基于0的。

包含5个元素的列表将创建一个包含6个条目的数组。因此，当您尝试在整个长度上迭代数组时，您将获得ArrayIndexOutOfBoundsException，因为该数组包含的条目少于您预期的条目。

将子项添加到ExpandalbeRecyclerView

1 个答案: