从recyclerview android获取选中的复选框列表

Question

我已经用图像、标题和复选框填充了 recyclerView。 我有两个问题。

1. 如何在单击 imageview 或整个回收站项目时选中复选框。

2. 我必须通过从 recyclerview 中获取所有选中的项目来进行下一个活动。

我的布局：

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp">

    <ImageView
        android:id="@+id/image"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:layout_gravity="center_horizontal"
        android:contentDescription="Interests"
        android:scaleType="centerCrop"
        android:src="@drawable/ic_yash_dp" />

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_gravity="bottom"
        android:layout_margin="5dp"
        android:layout_marginTop="24dp"
        android:background="@drawable/rounded_corners"
        android:gravity="bottom"
        android:padding="5dp"
        android:text="GYM"
        android:textAlignment="center"
        android:textColor="@color/white" />

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/checkBox"
        android:layout_margin="2dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

</RelativeLayout>

我的适配器：

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

    final InterestBean model = arrayList.get(position);
    final int pos = position;

    RecyclerViewHolder mainHolder = (RecyclerViewHolder) holder;// holder

    Bitmap image = BitmapFactory.decodeResource(context.getResources(),
    model.getImage());// This will convert drawbale image into bitmap

    // setting title
    mainHolder.title.setText(model.getTitle());
    mainHolder.imageview.setImageBitmap(image);
    mainHolder.checkBox.setChecked(arrayList.get(position).isSelected());
    mainHolder.checkBox.setTag(arrayList.get(position));

    mainHolder.checkBox.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            CheckBox cb = (CheckBox) v;
            InterestBean contact = (InterestBean) cb.getTag();

            contact.setIsSelected(cb.isChecked());
            arrayList.get(pos).setIsSelected(cb.isChecked());
            selectedItems.add(pos);
            Toast.makeText(v.getContext(), pos + cb.isChecked(), Toast.LENGTH_LONG).show();
        }
    });
}

Answer 1

一个简单的解决方案是创建OnItemCheckLister，并按如下方式实现它：

public class MyAdapter extends RecyclerViewAdapter {

    interface OnItemCheckListener {
        void onItemCheck(Item item);
        void onItemUncheck(Item item);
    }

    ...

    @NonNull
    private OnItemCheckListener onItemClick;

    public MyAdapter (List<Item> items, @NonNull OnItemCheckListener onItemCheckListener) {
        this.items = items;
        this.onItemClick = onItemCheckListener;
    }

    ...

    @Override
    public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof MyViewHolder) {
            final Item currentItem = items.get(position);

            ...
     
            ((MyViewHolder) holder).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    ((MyViewHolder) holder).checkbox.setChecked(
                            !((MyViewHolder) holder).checkbox.isChecked());
                    if (((MyViewHolder) holder).checkbox.isChecked()) {
                        onItemClick.onItemCheck(currentItem);
                    } else {
                        onItemClick.onItemUncheck(currentItem);
                    }
                }
            });
        }
    }

    static class MyViewHolder extends RecyclerView.ViewHolder {
        CheckBox checkbox;
        View itemView;

        ...

        public MyViewHolder(View itemView) {
            super(itemView);
            this.itemView = itemView;
            checkbox = (CheckBox) itemView.findViewById(R.id.checkbox);
            checkbox.setClickable(false);
            ...
        }

        public void setOnClickListener(View.OnClickListener onClickListener) {
            itemView.setOnClickListener(onClickListener);
        }
    }
}

那么在activity中，我们可以这样做：

    private List<Item> currentSelectedItems = new ArrayList<>();
    
    ...

    myAdapter = new MyAdapter(items, new MyAdapter.OnItemCheckListener() {
            @Override
            public void onItemCheck(Item item) {
                currentSelectedItems.add(item);
            }

            @Override
            public void onItemUncheck(Item item) {
                currentSelectedItems.remove(item);
            }
        });

然后你就可以用currentSelectedItems 做事了。

注意：由于此解决方案假设要按下整个项目，因此复选框设置为不可点击。

Answer 2

您可以使用 Model 类来获取 recyclerView 选中的项目。更多参考：Android Recyclerview checkbox

型号

public class Model {

    private boolean isSelected;
    private String animal;

    public String getAnimal() {
        return animal;
    }

    public void setAnimal(String animal) {
        this.animal = animal;
    }

    public boolean getSelected() {
        return isSelected;
    }

    public void setSelected(boolean selected) {
        isSelected = selected;
    }
}

适配器

import android.content.Context;
 import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
    import android.view.View;
 import android.view.ViewGroup;
 import android.widget.CheckBox;
 import android.widget.TextView;
 import android.widget.Toast;

 import java.util.ArrayList;


  public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.MyViewHolder> {

private LayoutInflater inflater;
public static ArrayList<Model> imageModelArrayList;
private Context ctx;

public CustomAdapter(Context ctx, ArrayList<Model> imageModelArrayList) {

    inflater = LayoutInflater.from(ctx);
    this.imageModelArrayList = imageModelArrayList;
    this.ctx = ctx;
}

@Override
public CustomAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View view = inflater.inflate(R.layout.rv_item, parent, false);
    MyViewHolder holder = new MyViewHolder(view);

    return holder;
}

@Override
public void onBindViewHolder(final CustomAdapter.MyViewHolder holder, int position) {

    holder.checkBox.setText("Checkbox " + position);
    holder.checkBox.setChecked(imageModelArrayList.get(position).getSelected());
    holder.tvAnimal.setText(imageModelArrayList.get(position).getAnimal());

   // holder.checkBox.setTag(R.integer.btnplusview, convertView);
    holder.checkBox.setTag(position);
    holder.checkBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Integer pos = (Integer) holder.checkBox.getTag();
            Toast.makeText(ctx, imageModelArrayList.get(pos).getAnimal() + " clicked!", Toast.LENGTH_SHORT).show();

            if (imageModelArrayList.get(pos).getSelected()) {
                imageModelArrayList.get(pos).setSelected(false);
            } else {
                imageModelArrayList.get(pos).setSelected(true);
            }
        }
    });


}

@Override
public int getItemCount() {
    return imageModelArrayList.size();
}

class MyViewHolder extends RecyclerView.ViewHolder {

    protected CheckBox checkBox;
    private TextView tvAnimal;

    public MyViewHolder(View itemView) {
        super(itemView);

        checkBox = (CheckBox) itemView.findViewById(R.id.cb);
        tvAnimal = (TextView) itemView.findViewById(R.id.animal);
    }

}

Answer 3

首先在穆德尔类中设置一个布尔值

并单击复选框传递布尔值 true

并通过以下方法检查所有复选框是否被单击

 fun isListContainMethod(arraylist: List<Puzzle>): Boolean {
    for (puzzle in arraylist) {
        if (!puzzle.isSelect) {
            return false
        }
    }
    return true
}

Answer 4

1) 您可以添加 mainHolder.imageview OnClickListener
2）两步：

1. 添加到 InterestBean 模型 boolen isChecked
   
2. 去哪里下一个活动，获取所有的InterestBeans，获取所有选中的InterestBeans 并保存。

代码：

mainHolder.imageview.setOnClickListener(new View.OnClickListener()
{
    public void onClick (View v)
    {
        mainHolder.checkBox.setChecked(!mainHolder.checkBox.isChecked());
    }
});

Answer 5

来自@ninjahoahong 我在 onBindViewHolder 方法中添加了复选框监听器，并且复选框可以点击。

viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        int pos = viewHolder.getAdapterPosition();
        ChoiceItem currentItem = mChoice.get(pos);
        if(viewHolder.checkBox.isChecked()){
            onItemCheckListener.onItemCheck(currentItem);
            currentItem.setCheck(true);
        }else{
            onItemCheckListener.onItemUncheck(currentItem);
            currentItem.setCheck(false);
        }
    }
});

Answer 6

recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext(), recyclerView, new RecyclerTouchListener.ClickListener() {
    @Override
    public void onClick(View view, int position) {
        List list= aList.get(position);
        //Toast.makeText(getApplicationContext(), movie.getTitle() + " is selected!", Toast.LENGTH_SHORT).show();
        action(list.getId());
    }

    @Override
    public void onLongClick(View view, int position) {

    }
}));

Answer 7

这对我有用，也对你有用 只需创建静态列表，我在 MainActivity.java 上创建它

public static List<String> myItems = new ArrayList<>();

在 YouAdapter.class 中创建 setOnCheckedChangeListener

holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            if(b){
                myItems.add(Model.getYouItem());
            }
            else{
                myItems.remove(Model.getYouItem());
            }
        }
    });

现在您可以使用您的 myItems 列表来执行操作。