如何在Android的CardView中只選擇一個單選按鈕？

Question

我想從CardView生成的列表中每次只選擇一個單選按鈕。我已經嘗試了很多答案，包括this one。但這些似乎都沒有奏效。這裏是我的代碼 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

，你必須在你的模型類添加布爾和檢查無線電支票變化聽者和在你的列表中設置位置明智的標誌，然後通知適配器

Answer 2

我已經通過更改和測試代碼解決了問題，我得到了一個可行的代碼。它實際上是從this answer.，但我用它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; 
    } 
} 

}