RecyclerView中的CheckBox继续检查其他项目 [英] CheckBox in RecyclerView keeps on checking different items

问题描述

这是我在RecyclerView中的商品的XML

Here's the XML for my items inside the RecyclerView

<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/cvItems"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    android:layout_margin="2dp"
    card_view:cardElevation="0dp"
    card_view:contentPadding="0dp"
    card_view:cardBackgroundColor="#FFFFFF"
    >

    <LinearLayout
        android:orientation="horizontal"
        android:layout_height="fill_parent"
        android:layout_width="fill_parent">
        <TextView
            android:layout_width="0dip"
            android:layout_height="match_parent"
            android:layout_weight="0.8"
            android:id="@+id/tvContent"
            android:textSize="15dp"
            android:paddingLeft="5dp"
            android:paddingRight="5dp" />
        <CheckBox
            android:id="@+id/cbSelect"
            android:layout_width="0dip"
            android:layout_weight="0.2"
            android:layout_height="match_parent"
            android:button="@drawable/cb_checked"
            android:gravity="center_horizontal"
            android:textAlignment="center"
            android:layout_gravity="center_horizontal" />
    </LinearLayout>
</android.support.v7.widget.CardView>

下面是RecyclerView适配器，它为每个项目增加了上面的布局:

And here's the RecyclerView adapter that inflate the layout above for each of its items:

public class AdapterTrashIncome extends RecyclerView.Adapter<AdapterTrashIncome.ViewHolder> {

    private ArrayList<ObjectIncome> myItems = new ArrayList<>();

    public AdapterTrashIncome(ArrayList<ObjectIncome> getItems, Context context){
        try {
            mContext = context;
            myItems = getItems;
        }catch (Exception e){
            Log.e(FILE_NAME, "51: " + e.toString());
            e.printStackTrace();
        }
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        public TextView tvContent;
        public CheckBox cbSelect;

        public ViewHolder(View v) {
            super(v);
            tvContent = (TextView) v.findViewById(R.id.tvContent);
            cbSelect = (CheckBox) v.findViewById(R.id.cbSelect);
        }
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        final ObjectIncome objIncome = myItems.get(position);
        String content = "<b>lalalla</b>";
        holder.tvContent.setText(Html.fromHtml(content));
    }
}

问题是，假设我在RecyclerView中有10个项目.当我选中项目1,2,3上的复选框时，我向下滚动了RecyclerView，突然检查了其他一些项目，例如项目8,9.当我再次向上滚动时，将检查项目1和3而不是项目2.您知道为什么会发生这种情况吗?

The problem is, let's say I have 10 items inside the RecyclerView. When I checked the checkbox on item 1,2,3 then I scroll down the RecyclerView, suddenly some of the other items eg items 8,9 is checked. And when I scroll up again, item 1 and 3 is checked but not item 2. Any idea why this happen?

推荐答案

这是预期的行为.您没有选择复选框.您正在选择一个，视图持有者将其保持选中状态.您可以将布尔变量添加到ObjectIncome对象中，并保持项目的选择状态.

That's an expected behavior. You are not setting your checkbox selected or not. You are selecting one and View holder keeps it selected. You can add a boolean variable into your ObjectIncome object and keep your item's selection status.

您可以看一下我的例子.您可以执行以下操作:

You may look at my example. You can do something like that:

public class AdapterTrashIncome extends RecyclerView.Adapter<AdapterTrashIncome.ViewHolder> {

    private ArrayList<ObjectIncome> myItems = new ArrayList<>();

    public AdapterTrashIncome(ArrayList<ObjectIncome> getItems, Context context){
        try {
            mContext = context;
            myItems = getItems;
            }catch (Exception e){
            Log.e(FILE_NAME, "51: " + e.toString());
            e.printStackTrace();
        }
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        public TextView tvContent;
        public CheckBox cbSelect;

        public ViewHolder(View v) {
            super(v);
            tvContent = (TextView) v.findViewById(R.id.tvContent);
            cbSelect = (CheckBox) v.findViewById(R.id.cbSelect);
        }
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        final ObjectIncome objIncome = myItems.get(position);
        String content = "<b>lalalla</b>";
        holder.tvContent.setText(Html.fromHtml(content));

        //in some cases, it will prevent unwanted situations
        holder.cbSelect.setOnCheckedChangeListener(null);

        //if true, your checkbox will be selected, else unselected
        holder.cbSelect.setChecked(objIncome.isSelected());

        holder.cbSelect.setOnCheckedChangeListener(new OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    //set your object's last status
                    objIncome.setSelected(isChecked);
            }
        });

    }
}

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