从 RecyclerView 中删除项目

Question

当我从 RecycerView 的列表中删除项目时遇到问题。我想做以下功能。当我按下 RecycerView 列表中的复选框时，该项目将从列表中删除。基本上，当我按下一些顶部/底部复选框时，这是有效的，但是当我按下中间的一些复选框时，我什至没有触摸它们，其他复选框就被标记为“已选中”。我不知道这个问题从何而来。

这是我的适配器中的代码：

public class ShoppingListAdapter extends RecyclerView.Adapter<ShoppingListAdapter.ShoppingListViewHolder> {
private ArrayList<Item> mItems;
private Context mContext;

public ShoppingListAdapter(Context context, ArrayList<Item> items) {
    mItems = items;
    mContext = context;
}

@Override
public ShoppingListViewHolder onCreateViewHolder(ViewGroup viewGroup, int position) {
    View view = LayoutInflater.from(mContext).inflate(R.layout.shopping_list_item,viewGroup,false);
    ShoppingListViewHolder viewHolder = new ShoppingListViewHolder(view);

    return viewHolder;
}

@Override
public void onBindViewHolder(ShoppingListViewHolder shoppingListViewHolder, int position) {
    shoppingListViewHolder.bindShoppingList(mItems.get(position));
}

@Override
public int getItemCount() {
    return mItems.size();
}

public class ShoppingListViewHolder extends RecyclerView.ViewHolder implements CompoundButton.OnCheckedChangeListener{
    public TextView mShoppingListItem;
    public CheckBox mCheckBox;

    public ShoppingListViewHolder(View itemView) {
        super(itemView);
        mShoppingListItem = (TextView) itemView.findViewById(R.id.shoppingListItem);
        mCheckBox = (CheckBox) itemView.findViewById(R.id.shoppingListCheckBox);
        mCheckBox.setOnCheckedChangeListener(this);
    }

    public void bindShoppingList(Item item){
        mShoppingListItem.setText(item.getItemDescription());
    }


    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        removeAt(getAdapterPosition(),this);
    }
}

public void removeAt(int position,ShoppingListViewHolder viewHolder) {
    mItems.remove(position);
    notifyItemRemoved(position);
}

这是我在 MainActivity 中的代码：

public class MainActivity extends AppCompatActivity {
private Toolbar mToolbar;
private RecyclerView mRecyclerView;
private ArrayList<Item> shoppingListItems;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mToolbar = (Toolbar)findViewById(R.id.tool_bar);
    setSupportActionBar(mToolbar);
    mRecyclerView = (RecyclerView)findViewById(R.id.recyclerView);
    shoppingListItems = new ArrayList<>();
    shoppingListItems.add(new Item("Apples"));
    shoppingListItems.add(new Item("Bred"));
    shoppingListItems.add(new Item("Potatoes"));
    shoppingListItems.add(new Item("Muffins"));
    shoppingListItems.add(new Item("Crackers"));
    shoppingListItems.add(new Item("Spaghetti"));
    shoppingListItems.add(new Item("Plastic Bags"));
    shoppingListItems.add(new Item("Deodorant"));
    shoppingListItems.add(new Item("Razors"));
    shoppingListItems.add(new Item("Shampoo"));
    shoppingListItems.add(new Item("Tooth brushes"));
    shoppingListItems.add(new Item("Butter"));
    shoppingListItems.add(new Item("Bagels"));
    shoppingListItems.add(new Item("Coconut water"));
    shoppingListItems.add(new Item("Tomatoes"));

    ShoppingListAdapter adapter = new ShoppingListAdapter(this,shoppingListItems);
    mRecyclerView.addItemDecoration(new SimpleDividerItemDecoration(getApplicationContext()));
    mRecyclerView.setAdapter(adapter);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

Answer 1

我认为“自动”选中的项目重用了已删除项目的视图持有者（包括选中的复选框）。当您绑定ViewHolder 时，尝试（重新）将复选框的状态设置为 false：

ShoppingListViewHolder {
    public void bindShoppingList(Item item){
        mShoppingListItem.setText(item.getItemDescription());
        mCheckBox.setChecked(false);// <- this
    }
}

onBindViewHolder是您设置项目视图以匹配项目数据的位置