Question

我创建了listview，它在每一行都提供了独特的视图，但我添加了复选框。我遇到了一个问题，即检查第一项并滚动列表。奇怪的匿名项目，检查。你能为此提供解决方案吗？谢谢

@PreDestroy

Answer 1

您必须创建一个包含要在listview行中显示的所有组件（EX：ComponentClass）的类。在这个类中创建布尔值和所有setter / getter和.... 在适配器Java类范围arrayAdapter中，您必须创建名为ViewHolder的内部类，并使用此内部类来显示适配器的组件。

static class ViewHolder {
    TextView text;
    CheckBox checkbox;
}

在getView方法中，使用blew code：

viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                int getPosition = (Integer) buttonView.getTag();  // Here we get the position that we have set for the checkbox using setTag.
                ComponentClass.get(getPosition).setSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
            }
        });

感谢Lalit Poptani

Answer 2

我遇到了同样的问题。我通过在适配器类中重写这两个方法来解决它。

@Override
public int getViewTypeCount() {
          return getCount();
}

@Override
public int getItemViewType(int position) {

 return position;
}

希望这有帮助！

Answer 3

Great example shown here

Example 2

您正在选择一个并且View holder会保持选中状态。您可以将一个bolean变量添加到ObjectIncome对象中，并保持项目的选择状态。

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);
            }
        });

    }
}

在您的活动的onCreate方法中。

recyclerView = (RecyclerView) findViewById(R.id.recyclerview1);

        recylerViewLayoutManager = new LinearLayoutManager(context);

        recyclerView.setLayoutManager(recylerViewLayoutManager);

        recyclerViewAdapter = new RecyclerViewAdapter(context, subjects);

        recyclerView.setAdapter(recyclerViewAdapter);

您的Activiy xml就像

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.android_examples.recyclerview_android_examplescom.MainActivity"
    android:id="@+id/relativelayout1">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview1"
        android:scrollbars="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />

</RelativeLayout>

Listview中的复选框会检查错误的位置项

3 个答案: