从recyclerView中选择项目中的一个复选框，然后取消选择以前选择的复选框

Question

我有一个带有部分的回收器视图。项目包括行和标题。我想用复选框选择一个项目，如果用户选择下一个，我想取消选择旧的项目(复选框(。我找不到任何地方可以实现此功能。

这是我的代码

recyclerView = (RecyclerView)findViewById(R.id.recyclerViewActivityExample);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
list = new ArrayList<>();
list.add(new AnimalObject("Cat","Mammals", false));
list.add(new AnimalObject("Lion","Mammals", false));
list.add(new AnimalObject("Dog","Mammals", false));
list.add(new AnimalObject("Monkey","Mammals", false));
list.add(new AnimalObject("Puma","Mammals", false));
list.add(new AnimalObject("Albatross","Birds", false));
list.add(new AnimalObject("Pigeon","Birds", false));
list.add(new AnimalObject("Crabs","Aquatic Animals", false));
list.add(new AnimalObject("Sharks","Aquatic Animals", false));
MyAdapter myAdapter = new MyAdapter();

sectionedRecyclerViewAdapter = new SectionedRecyclerViewAdapter(getApplicationContext(),
R.layout.layout_list_section, R.id.textViewItemSection, myAdapter, this);
sectionedRecyclerViewAdapter.setSections(list);
recyclerView.setAdapter(sectionedRecyclerViewAdapter);
}


//-------------------Adapter----------------------------
public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> implements MyViewHolder.ViewHolderClickListener {
@Override
public int getItemCount() {
return list.size();
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.
from(parent.getContext()).
inflate(R.layout.layout_list_item, parent, false);
return new MyViewHolder(itemView,this);
}
@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
AnimalObject animalObject = list.get(position);
holder.title.setText(animalObject.name);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// checkbox.setChecked(true);
row_index = position;
notifyDataSetChanged();
}
});
if (row_index == position) {
holder.checkBox.setChecked(true);
} else {
holder.checkBox.setChecked(false);
}
}
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), list.get(sectionedRecyclerViewAdapter.getIndexForPosition(recyclerView.getChildPosition(v))).name,Toast.LENGTH_SHORT).show();
}
}

//适配器

public String name;
public String type;
public boolean ischecked ;
public AnimalObject(final String name, final String type, boolean ischecked){
this.name = name ;
this.type = type ;
this.ischecked = ischecked;
}
public boolean ischecked() {
return ischecked;
}
public void setIschecked(boolean ischecked) {
this.ischecked = ischecked;
}

Answer 1

在Adapter内部

使用此：
private int row_index;

@Override
public void onBindViewHolder(final Main_Page_Payment_Cash_Adapter.ViewHolder holder, final int position) {
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// checkbox.setChecked(true);
row_index = position;
notifyDataSetChanged();
}
});
if (row_index == position) {
// checkbox.setChecked(true);
} else {
// checkbox.setChecked(false);
}
}

我希望这就是你想要的。

Answer 2

@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
AnimalObject animalObject = list.get(position);
holder.title.setText(animalObject.name);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AnimalObject animalObject = list.get(position);
int currentCheckedStatus = animalObject.ischecked();
for (int i =0;i<list.size();i++)
{
if (i==position)
{
animalObject.setIschecked(!currentCheckedStatus);
}
else
{
animalObject.setIschecked(false);
}
}
notifyDataSetChanged();
}
});
holder.checkBox.setChecked(animalObject.ischecked());
}

Answer 3

完整示例

public class ChildAddressAdapter extends 
RecyclerView.Adapter<ChildAddressAdapter.CartViewHolder> {
private Activity context;
private List<AddressDetail> addressDetailList;
private int selectedPosition = -1;
public ChildAddressAdapter(Activity context, List<AddressDetail> addressDetailList) {
this.context = context;
this.addressDetailList = addressDetailList;
}
@NonNull
@Override
public CartViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View myView = inflater.inflate(R.layout.address_layout, parent, false);
return new CartViewHolder(myView);
}
@Override
public void onBindViewHolder(@NonNull CartViewHolder holder, int position) {
holder.adress_checkbox.setOnClickListener(view -> {
selectedPosition = holder.getAdapterPosition();
notifyDataSetChanged();
});
if (selectedPosition==position){
holder.adress_checkbox.setChecked(true);
}
else {
holder.adress_checkbox.setChecked(false);
}

}
@Override
public int getItemCount() {
return  addressDetailList.size();
}
class CartViewHolder extends RecyclerView.ViewHolder
{
TextView address_text,address_tag;
CheckBox adress_checkbox;
CartViewHolder(View itemView) {
super(itemView);
address_text = itemView.findViewById(R.id.address_text);
address_tag = itemView.findViewById(R.id.address_tag);
adress_checkbox = itemView.findViewById(R.id.adress_checkbox);
}
}}