如何在 Android 的 CardView 中只选择一个单选按钮？

Question

我试图从 cardView 生成的列表中一次只选择一个单选按钮。我尝试了很多答案，包括this one。但这些似乎都不起作用。这是我的代码 group_list_item.xml

<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:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="1dp"
android:layout_marginRight="1dp"
android:layout_marginTop="1dp"
android:elevation="1dp"
card_view:cardCornerRadius="1dp">
<RelativeLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="70dp"
    android:padding="10dp"
    android:background="?android:selectableItemBackground">
    <TextView
        android:text="Description"
        android:id="@+id/owner"
        android:textStyle="italic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="84dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true" />
    <TextView
        android:text="Title"
        android:textSize="25dp"
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignStart="@+id/username" />
    <RadioButton
        android:text="Select"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_alignParentEnd="true"
        android:layout_marginEnd="23dp"
        android:id="@+id/radioButton" />
</RelativeLayout>

CustomGroupAdapter.java

public class CustomGroupAdapter extends RecyclerView.Adapter<CustomGroupAdapter.MyVH>{
private int selectedPosition = -1;
View view;
Context context;
private List<GroupDataModel> dataModels;
private LayoutInflater inflater;
public CustomGroupAdapter(Context context, List<GroupDataModel> data){
    this.context = context;
    this.dataModels = data;
    this.inflater = LayoutInflater.from(context);
}
@Override
public MyVH onCreateViewHolder(ViewGroup parent, int viewType) {
    view = inflater.inflate(R.layout.group_list_item, parent, false);
    MyVH myVH = new MyVH(view);
    return myVH;
}
@Override
public int getItemCount() {
    return dataModels.size();
}

@Override
public void onBindViewHolder(final MyVH holder, final int position) {

    GroupDataModel dataModel = dataModels.get(position);
    holder.setData(dataModel, position);
    final RadioButton radioButton = (RadioButton) holder.itemView.findViewById(R.id.radioButton);
    holder.itemView.findViewById(R.id.radioButton).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (selectedPosition == -1) {
                radioButton.setChecked(position == getItemCount() - 1);
            } else {
                radioButton.setChecked(selectedPosition == position);
            }
        }
    });
}
class MyVH extends RecyclerView.ViewHolder{
    TextView name;
    TextView owner;
    int postion;
    GroupDataModel dataModel;
    public MyVH(View itemView) {
        super(itemView);
        name = (TextView) itemView.findViewById(R.id.name);
        owner = (TextView) itemView.findViewById(R.id.owner);
    }
    public void setData(GroupDataModel dataModel, int position) {
        this.name.setText(dataModel.getName());
        this.owner.setText(dataModel.getOwner());
        this.postion = position;
        this.dataModel = dataModel;
    }
  }
}

Answer 1

您必须在模型类中添加布尔值并检查无线电检查更改列表器并在列表中设置位置明智标志，然后通知适配器

Answer 2

我已经通过更改和测试代码解决了这个问题，我得到了一个有效的。它实际上来自this answer. 但我已经将它用于cardView。

public class CustomGroupAdapter extends RecyclerView.Adapter<CustomGroupAdapter.MyVH>{
RadioButton radioButton;
View view;
Context context;
private List<GroupDataModel> dataModels;
private LayoutInflater inflater;
public CustomGroupAdapter(Context context, List<GroupDataModel> data){
    this.context = context;
    this.dataModels = data;
    this.inflater = LayoutInflater.from(context);
}
@Override
public MyVH onCreateViewHolder(ViewGroup parent, int viewType) {
    view = inflater.inflate(R.layout.group_list_item, parent, false);
    MyVH myVH = new MyVH(view);
    return myVH;
}
@Override
public int getItemCount() {
    return dataModels.size();
}

@Override
public void onBindViewHolder(final MyVH holder, final int position) {

    GroupDataModel dataModel = dataModels.get(position);
    holder.setData(dataModel, position);
    holder.itemView.findViewById(R.id.radioButton).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(radioButton == null){
                radioButton = (RadioButton) v;
            radioButton.setChecked(true);
        }
        if(radioButton== v)
                return;
        radioButton.setChecked(false);
        ((RadioButton)v).setChecked(true);
        radioButton = (RadioButton)v;
    }
    });
}
class MyVH extends RecyclerView.ViewHolder{
    TextView name;
    TextView owner;
    int postion;
    GroupDataModel dataModel;
    public MyVH(View itemView) {
        super(itemView);
        name = (TextView) itemView.findViewById(R.id.name);
        owner = (TextView) itemView.findViewById(R.id.owner);
    }
    public void setData(GroupDataModel dataModel, int position) {
        this.name.setText(dataModel.getName());
        this.owner.setText(dataModel.getOwner());
        this.postion = position;
        this.dataModel = dataModel;
    }
}

}