java - 如何从嵌套的 Recycler View 中获取多个 Checkbox 状态？

Question

在嵌套的回收器视图中，我有多个复选框（在我的情况下为开关）。它如下所示：

我希望能够在用户返回时检索此屏幕上的所有开关状态，并能够识别哪些设置为真。例如，我正在寻找与此类似格式的东西： [Item 0, Sub Item 1, TRUE], [Item 0, Sub Item 2, TRUE], [Item 1, Sub Item 0, TRUE] ，等等

我的问题是我不确定如何存储这些开关状态。当它们被放置在嵌套的回收器视图中时，我不确定如何在此处获取特定的开关值。

这是我正在关注的代码：

主要活动

package com.example.recycledviewpoolexample;

import android.nfc.Tag;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RecyclerView rvItem = findViewById(R.id.rv_item);
        LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);
        ItemAdapter itemAdapter = new ItemAdapter(buildItemList());
        rvItem.setAdapter(itemAdapter);
        rvItem.setLayoutManager(layoutManager);
    }

    private List<Item> buildItemList() {
        List<Item> itemList = new ArrayList<>();
        for (int i=0; i<10; i++) {
            Item item = new Item("Item "+i, buildSubItemList());
            itemList.add(item);
        }
        return itemList;
    }

    private List<SubItem> buildSubItemList() {
        List<SubItem> subItemList = new ArrayList<>();
        for (int i=0; i<3; i++) {
            SubItem subItem = new SubItem("Sub Item "+i, false);
            subItemList.add(subItem);
        }
        return subItemList;
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.d(TAG, "onResume");

        /*if Checkboxes are true, store/display them in the logs

        EXAMPLE OUTPUT:
        Item (String)
        SubItem (String)
         */
    }
}

项目.java

public class Item {
    private String itemTitle;
    private List<SubItem> subItemList;

    public Item(String itemTitle, List<SubItem> subItemList) {
        this.itemTitle = itemTitle;
        this.subItemList = subItemList;
    }

    public String getItemTitle() {
        return itemTitle;
    }

    public void setItemTitle(String itemTitle) {
        this.itemTitle = itemTitle;
    }

    public List<SubItem> getSubItemList() {
        return subItemList;
    }

    public void setSubItemList(List<SubItem> subItemList) {
        this.subItemList = subItemList;
    }
}

项适配器

public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ItemViewHolder> {

    private RecyclerView.RecycledViewPool viewPool = new RecyclerView.RecycledViewPool();
    private List<Item> itemList;

    ItemAdapter(List<Item> itemList) {
        this.itemList = itemList;
    }

    @NonNull
    @Override
    public ItemViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.layout_item, viewGroup, false);
        return new ItemViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ItemViewHolder itemViewHolder, int i) {
        Item item = itemList.get(i);
        itemViewHolder.tvItemTitle.setText(item.getItemTitle());

        // Create layout manager with initial prefetch item count
        LinearLayoutManager layoutManager = new LinearLayoutManager(
                itemViewHolder.rvSubItem.getContext(),
                LinearLayoutManager.VERTICAL,
                false
        );
        layoutManager.setInitialPrefetchItemCount(item.getSubItemList().size());

        // Create sub item view adapter
        SubItemAdapter subItemAdapter = new SubItemAdapter(item.getSubItemList());

        itemViewHolder.rvSubItem.setLayoutManager(layoutManager);
        itemViewHolder.rvSubItem.setAdapter(subItemAdapter);
        itemViewHolder.rvSubItem.setRecycledViewPool(viewPool);
    }

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

    class ItemViewHolder extends RecyclerView.ViewHolder {
        private TextView tvItemTitle;
        private RecyclerView rvSubItem;

        ItemViewHolder(View itemView) {
            super(itemView);
            tvItemTitle = itemView.findViewById(R.id.tv_item_title);
            rvSubItem = itemView.findViewById(R.id.rv_sub_item);
        }
    }
}

子项.java

package com.example.recycledviewpoolexample;

public class SubItem {
    private int subItemImage;
    private String subItemTitle;
    private boolean checkbox;

    public SubItem(String subItemTitle, boolean checkbox) {
        this.subItemTitle = subItemTitle;
        this.checkbox = checkbox;
    }

    public int getSubItemImage() {
        return subItemImage;
    }

    public void setSubItemImage(int subItemImage) {
        this.subItemImage = subItemImage;
    }

    public String getSubItemTitle() {
        return subItemTitle;
    }

    public void setSubItemTitle(String subItemTitle) {
        this.subItemTitle = subItemTitle;
    }

    public boolean isSelected() {
        return checkbox;
    }

    public void setCheckbox(boolean checkbox) {
        this.checkbox = checkbox;
    }
}

子项适配器.java

public class SubItemAdapter extends RecyclerView.Adapter<SubItemAdapter.SubItemViewHolder> {

    private List<SubItem> subItemList;

    SubItemAdapter(List<SubItem> subItemList) {
        this.subItemList = subItemList;
    }

    @NonNull
    @Override
    public SubItemViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.layout_sub_item, viewGroup, false);
        return new SubItemViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull SubItemViewHolder subItemViewHolder, int i) {
        final SubItem subItem = subItemList.get(i);
        subItemViewHolder.tvSubItemTitle.setText(subItem.getSubItemTitle());
        subItemViewHolder.checkBox.setOnCheckedChangeListener(null);
        subItemViewHolder.checkBox.setChecked(subItem.isSelected());

        subItemViewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
                subItem.setCheckbox(isChecked);

            }
        });
    }

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

    class SubItemViewHolder extends RecyclerView.ViewHolder {
        TextView tvSubItemTitle;
        Switch checkBox;

        SubItemViewHolder(View itemView) {
            super(itemView);
            tvSubItemTitle = itemView.findViewById(R.id.tv_sub_item_title);
            checkBox = itemView.findViewById(R.id.switch1);
        }
    }
}

layout_sub_item.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="12dp">
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <ImageView
                android:id="@+id/img_sub_item"
                android:layout_width="60dp"
                android:layout_height="60dp"
                android:background="@color/colorPrimaryDark"
                android:src="@drawable/ic_launcher_foreground"/>
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_toEndOf="@id/img_sub_item"
                android:padding="12dp"
                android:orientation="vertical">
                <TextView
                    android:id="@+id/tv_sub_item_title"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:textStyle="bold"
                    android:text="Sub item title"/>

                <Switch
                    android:id="@+id/switch1"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"/>
            </LinearLayout>

        </RelativeLayout>
    </android.support.v7.widget.CardView>

</FrameLayout>

layout_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:cardBackgroundColor="#f3f3f3"
        app:cardElevation="8dp"
        android:layout_margin="12dp">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="12dp"
            android:orientation="vertical">
            <TextView
                android:id="@+id/tv_item_title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="12sp"
                android:textSize="18sp"
                android:text="Item Title"/>
            <android.support.v7.widget.RecyclerView
                android:id="@+id/rv_sub_item"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
        </LinearLayout>
    </android.support.v7.widget.CardView>

</LinearLayout>

任何帮助，将不胜感激。谢谢！

标签： javaandroidcheckboxandroid-recyclerview