java - 单击 : update content of expandable ListView

Question

我正在将数据(Json)从服务器解析到可扩展的 ListView，其结构如下:

{
  "package":[ 
    "title":"Selection 1",
    "price": 200,
    "content":[stuff inside the exp listview]
  ]
} ,
{
  "discount":[ 
    "title:"discount 1",
    "amount": 100
  ]
}

结果应该是这样的: Screenshot

解析数据不是问题，我有两个问题:

折扣按钮应该具有按钮行为，但只能选择(可点击)一个折扣，onClick:折扣应用于上面的 ExpandableListView

我考虑了单个按钮的 CardView，然后将其与我的 json 中的折扣金额相乘(由于适配器):

<androidx.cardview.widget.CardView
android:layout_width="91dp"
android:layout_height="132dp"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="350dp" >

        <TextView
            android:id="@+id/textView"
            android:layout_width="match_parent"
            android:layout_height="35dp"
            android:text="TextView"
            tools:text="Discount" />
</androidx.cardview.widget.CardView>

但我的主要问题是 Buttons/CardView 的 OnClickBehaviour 应该将折扣应用于“确定”按钮旁边的价格。客户做出选择后，“确定”按钮应访问我的 CardView 折扣的选择。

这是适配器的列表组:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:id="@+id/lblListHeaderLayout"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="@dimen/default_padding"
    android:orientation="horizontal"

    >

<RelativeLayout

    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:paddingStart="?android:attr/expandableListPreferredItemPaddingLeft"
    android:paddingEnd="@dimen/feed_item_padding_left_right"
    android:layout_weight="0.9"
    >

    <TextView
        android:id="@+id/lblListHeader"
        android:textSize="@dimen/text_title_list_header"
        android:textColor="@color/Textwhite"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="@font/mont_bold"

        />

    <TextView
        android:id="@+id/lblListHeader_Price"
        android:textSize="@dimen/text_title_list_header"
        android:textColor="@color/Textwhite"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:fontFamily="@font/mont_bold"

        />
</RelativeLayout>

    <Button
        android:id="@+id/lblListHeaderButton"
        android:layout_width="60dp"
        android:layout_height="30dp"
        android:background="@drawable/bg_btn_ripple_dark"
        android:text="@string/btn_ok"
        android:textColor="@color/Textwhite"
        android:fontFamily="@font/mont_bold"
        android:focusable="false"

        />

</LinearLayout>

这是我的适配器类:

public class ExpandableListAdapter extends BaseExpandableListAdapter {
    private Context context;
    private List<String> listDataHeader,listDataHeaderPrice;
    private HashMap<String,List<String>> listHashMap;
    private List<Package> packageList;

    public ExpandableListAdapter(Context context, List<Package> packageList) {
        this.context = context;
        this.packageList= packageList;
    }


        @Override
    public int getGroupCount() {
        return packageList.size();
    }


    @Override
    public int getChildrenCount(int groupPosition) {

        return packageList.get(groupPosition).getContent().size();

    }

        @Override
    public Object getGroup(int groupPosition) {
        return listDataHeader.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return packageList.get(groupPosition).getContent();
    }

        @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

        @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }


  @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View view, ViewGroup parent) {
        String headerTitle = (String) packageList.get(groupPosition).getTitle();
        /** HEADER TEXT HERE */

        float headerPrice = packageList.get(groupPosition).getPrice();

        if(view==null) {
            LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.vip_package_listgroup,null);
        }
        final LinearLayout bgcolor = view.findViewById(R.id.lblListHeaderLayout);
        TextView lblListHeader = (TextView)view.findViewById(R.id.lblListHeader);
        TextView lblListHeaderPrice = (TextView)view.findViewById(R.id.lblListHeader_Price);
        Button lblListHeaderButton = view.findViewById(R.id.lblListHeaderButton);



        lblListHeaderButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent (context, drinks_selection.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(intent);
            }
        });

        lblListHeader.setText(headerTitle);
        lblListHeaderPrice.setText(String.format("%.02f",headerPrice).replace(".",",") +"USD");
        return view;

    }

     @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View view, ViewGroup parent) {


        final List<String> childTest = packageList.get(groupPosition).getContent();
        final String childText =  childTest.get(childPosition);

        if(view == null) {
            LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.vip_package_listitem,null);
        }
        TextView txtListChild = (TextView)view.findViewById(R.id.lblListItem);
        txtListChild.setText(childText);
        return view;


    }

Answer 1

尝试使用RadioGroup和RadioButtons来选择折扣并在适配器内添加公共(public)方法。我假设 RadioButton 上的文本是折扣金额，所以 单选按钮的代码:

    CompoundButton.OnCheckedChangeListener onCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            if(b) {
                mainAdapter.setDiscount(Float.valueOf(compoundButton.getText().toString()));
            }
        }
    };
    rb1.setOnCheckedChangeListener(onCheckedChangeListener);
    rb2.setOnCheckedChangeListener(onCheckedChangeListener);
    rb3.setOnCheckedChangeListener(onCheckedChangeListener);

适配器:

public class ExpandableListAdapter extends BaseExpandableListAdapter {
private Context context;
//private List<String> listDataHeader, listDataHeaderPrice;
//private HashMap<String, List<String>> listHashMap;
private List<Package> packageList;
private float discount = 0; //Added

public ExpandableListAdapter(Context context, List<Package> packageList) {
    this.context = context;
    this.packageList = packageList;
}

@Override
public int getGroupCount() {
    return packageList.size();
}

@Override
public int getChildrenCount(int groupPosition) {
    return packageList.get(groupPosition).getContent().size();
}

@Override
public Object getGroup(int groupPosition) {
    return packageList.get(groupPosition);
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    return packageList.get(groupPosition).getContent().get(childPosition);
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public View getGroupView(final int groupPosition, boolean isExpanded, View view, ViewGroup parent) {
    String headerTitle = (String) packageList.get(groupPosition).getTitle();
    /** HEADER TEXT HERE */

    float headerPrice = packageList.get(groupPosition).getPrice();

    if (view == null) {
        LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.vip_package_listgroup, null);
    }
    LinearLayout bgcolor = view.findViewById(R.id.lblListHeaderLayout);
    TextView lblListHeader = (TextView) view.findViewById(R.id.lblListHeader);
    TextView lblListHeaderPrice = (TextView) view.findViewById(R.id.lblListHeader_Price);
    Button lblListHeaderButton = view.findViewById(R.id.lblListHeaderButton);

    lblListHeaderButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(context, drinks_selection.class);
            intent.putExtra("discount", discount); //Added
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(intent);
        }
    });

    lblListHeader.setText(headerTitle);
    float endPrice = headerPrice + discount; //Added
    if(endPrice < 0) endPrice = 0; //Added
    lblListHeaderPrice.setText(String.format("%.02f", endPrice).replace(".", ",") + "USD"); //Changed
    return view;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View view, ViewGroup parent) {
    List<String> childTest = packageList.get(groupPosition).getContent();
    String childText = childTest.get(childPosition);

    if (view == null) {
        LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.vip_package_listitem, null);
    }
    TextView txtListChild = (TextView) view.findViewById(R.id.lblListItem);
    txtListChild.setText(childText);
    return view;
}

@Override
public boolean isChildSelectable(int i, int i1) {
    return false;
}

//Added this public method
public void setDiscount(float discount){
    this.discount = discount;
    notifyDataSetChanged();
}
}

希望有帮助!