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java - ExpandableListView:从子项获取输入值

转载 作者:行者123 更新时间:2023-12-02 09:55:22 29 4
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我正在将 JSON 解析为 ExpandableListView,在每个子项上,用户可以选择他想要拥有的 +/- 按钮的每个子项的数量。 +/- 按钮连接到 TextView,其中显示每个子项的总金额,总成本将显示在行尾。

在父级的底部应该有一个 TextView,其中包含 ExpListView 的每个子级中计算的所有值的摘要(摘要)底部的“确定”按钮应将每个子项的金额发送到服务器(该金额与 ID 连接)。

当我点击“确定”按钮时,我在读出每个 child 的金额时遇到问题 - 如何构建通向我 child 的值(value)观的桥梁?

我还遇到了读出每个 child 的成本以计算底部总成本的问题。 Child 中的 onClickListener 应该以某种方式刷新底部的 TextView,但据我所知,这并不容易,对吧?

有人知道如何访问这些值吗?

这是我的 ListAdapter 的 ChildView,魔法发生的地方:

public class ExpandableListAdapterDrinks extends BaseExpandableListAdapter {
private Context context;
private List<String> listDataHeader,listDataHeaderPrice;
private HashMap<String,List<String>> listHashMap;
private List<Drink> drinksList;


class ViewHolder {
TextView childText,counterText, childUnitPrice, childFinalPrice;
Button btn_plus,btn_minus;

}

class DrinksListChildItem{
String name;
int quantity;
DrinksListChildItem(String name, int quantity){
this.name = name;
this.quantity = quantity;
}
}

class Pos{
int group;
int child;
Pos(int group, int child){
this.group = group;
this.child = child;
}
}




public ExpandableListAdapterDrinks(Context context, List<Drink> drinksList) {
this.context = context;
this.drinksList= drinksList;

}




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


@Override
public int getChildrenCount(int groupPosition) {

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

}

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


@Override
public Object getChild(int groupPosition, int childPosition) {
return drinksList.get(groupPosition).getContent();
listHashMap.get(listDataHeader.get(groupPosition)).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) drinksList.get(groupPosition).getTitle();

/** HEADER TEXT HERE */



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);

lblListHeaderPrice.setVisibility(View.GONE);
lblListHeaderButton.setVisibility(View.GONE);

if(!drinksList.get(groupPosition).getBg().get(0).isEmpty() || !drinksList.get(groupPosition).getBg().get(1).isEmpty() ) {

List<String> colorGradientTopBottom = drinksList.get(groupPosition).getBg();

int[] colors = {Color.parseColor(colorGradientTopBottom.get(0)),Color.parseColor(colorGradientTopBottom.get(1))};
GradientDrawable gd = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, colors);
gd.setCornerRadius(0f);
bgcolor.setBackground(gd);
} else {

bgcolor.setBackgroundColor(ContextCompat.getColor(context, R.color.cardview_bg));
}

lblListHeader.setText(headerTitle);

return view;

}

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

/** Drinks List */
final ViewHolder viewHolder;

final List<String> childDrink = drinksList.get(groupPosition).getContent();
final List<Integer> childPrice = drinksList.get(groupPosition).getPricelist();
//final String childText = childDrink.get(childPosition);

if(view == null) {
LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.vip_drinks_listitem,null);

final TextView txtListChild = view.findViewById(R.id.lblListItemDrinks);
final TextView txtListDrinksUnitPrice = view.findViewById(R.id.lblListItemDrinksUnitPrice);
final TextView txtDrinksAmount = view.findViewById(R.id.vip_drinks_amount);
final TextView txtListDrinkPriceFinal = view.findViewById(R.id.lblListItemDrinksFinalPrice);
Button btn_plus = view.findViewById(R.id.vip_drinks_btn_plus);
Button btn_minus = view.findViewById(R.id.vip_drinks_btn_minus);

viewHolder = new ViewHolder();
viewHolder.childText = txtListChild;
viewHolder.childUnitPrice = txtListDrinksUnitPrice;
viewHolder.counterText = txtDrinksAmount;
viewHolder.childFinalPrice = txtListDrinkPriceFinal;
viewHolder.btn_plus = btn_plus;
viewHolder.btn_minus = btn_minus;


viewHolder.childText.setText(childDrink.get(childPosition));
viewHolder.counterText.setText("0");
viewHolder.childFinalPrice.setText("0");
final float headerPrice = childPrice.get(childPosition);
final int headerPriceInt = (int) headerPrice;
viewHolder.childUnitPrice.setText(String.format("%.02f",headerPrice).replace(".",",") +"€");

DrinksListChildItem child = childDrink.get(childPosition);


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

int t = Integer.parseInt(viewHolder.counterText.getText().toString());
ChildItem selectedItem = viewHolder.counterText.getText().toString();
selectedItem.quantity = selectedItem.quantity+1;
notifyDataSetChanged();

viewHolder.counterText.setText(String.valueOf(t + 1));
viewHolder.childFinalPrice.setText(String.valueOf((t+1)* headerPriceInt) + "€");
}
});



viewHolder.btn_minus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Pos pos = (Pos) v.getTag();
int t = Integer.parseInt(viewHolder.counterText.getText().toString());
DrinksListChildItem selectedItem = (DrinksListChildItem) getChild(pos.group,pos.child);
selectedItem.quantity = selectedItem.quantity-1;
notifyDataSetChanged();
viewHolder.counterText.setText(String.valueOf(t - 1));
viewHolder.counterText.setText(String.valueOf((t-1)* headerPriceInt) + "€");
}
});


} else {
viewHolder = (ViewHolder) view.getTag();
}


return view;

我在将您的代码粘合到我的代码时遇到了巨大的问题(使用 TextView 扩展问题):我不明白如何连接 ChildItem child = childDrink.get(childPosition);到我的 DrinksList 以使 setOnCLickListener 增加 selectedItem.quantity。该代码以某种方式起作用,但它打乱了我的 child 的顺序,并且还选择了其他 child 的数量

饮料(Pojo)

public class Drink {
@SerializedName("title")
@Expose
private String title;
@SerializedName("bg")
@Expose
private List<String> bg = null;
@SerializedName("content")
@Expose
private List<String> content = null;
@SerializedName("pricelist")
@Expose
private List<Integer> pricelist = null;

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public List<String> getBg() {
return bg;
}

public void setBg(List<String> bg) {
this.bg = bg;
}

public List<String> getContent() {
return content;
}

public void setContent(List<String> content) {
this.content = content;
}

public List<Integer> getPricelist() {
return pricelist;
}

public void setPricelist(List<Integer> pricelist) {
this.pricelist = pricelist;
}

}

VipDrinks(Pojo): 公共(public)课 VipDrinks {

@SerializedName("drinks")
@Expose
private List<Drink> drinks = null;

public List<Drink> getDrinks() {
return drinks;
}

public void setDrinks(List<Drink> drinks) {
this.drinks = drinks;
}

}

JSON 具有以下结构:

{
"drinks":[ {
"title":,
"bg":[],
"content":[],
"pricelist":[],
},
{...}
]
}

这是带有解析请求的 Activity :

public class drinks_selection extends AppCompatActivity {


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

final ExpandableListView listView = findViewById(R.id.vip_drinks_listview);


/** PARSING JSON FROM SERVER */

final JsonObjectRequest galleryUrls = new JsonObjectRequest(Request.Method.GET, PARSE_URL, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray packageArray = response.getJSONArray("drinks");
Log.e("response", String.valueOf(response));
GsonBuilder gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();
List<Drink> vipDrinks = Arrays.asList(gson.fromJson(String.valueOf(packageArray),Drink[].class));
List<Drink> arrayList = new ArrayList<>(vipDrinks);

ExpandableListAdapterDrinks listAdapter = new ExpandableListAdapterDrinks(getApplicationContext(),arrayList);
listView.setAdapter( listAdapter);
listView.expandGroup(0);

} catch (JSONException e) {
e.printStackTrace();
}

}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {


Log.e("ERROR", String.valueOf(error));
}
});

RequestQueue rQ = Volley.newRequestQueue(this);
rQ.add(galleryUrls);

}
}

VIP包列表Group.xml

<?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:background="@drawable/bg_vip_booking"
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>

VIP饮料ListItem.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="60dip"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_centerInParent="true"

>


<TextView
android:id="@+id/lblListItemDrinks"
android:paddingTop="@dimen/padding_small"
android:paddingBottom="@dimen/padding_small"
android:textSize="@dimen/text_normal"
android:paddingLeft="@dimen/default_padding"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:fontFamily="@font/mont_medium"
android:textColor="@color/Textwhite"
app:layout_constraintStart_toStartOf="parent"


/>



<RelativeLayout
android:id="@+id/vip_drinks_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toEndOf="@id/lblListItemDrinks"
android:paddingStart="@dimen/default_padding"
android:layout_centerInParent="true"
android:paddingEnd="@dimen/default_padding"
app:layout_constraintEnd_toEndOf="parent"



>

<TextView
android:id="@+id/lblListItemDrinksUnitPrice"
android:textSize="@dimen/text_normal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="@font/mont_light"
android:textColor="@color/Textwhite"
android:paddingEnd="@dimen/padding_small"
/>

<Button
android:id="@+id/vip_drinks_btn_minus"
android:layout_toEndOf="@id/lblListItemDrinksUnitPrice"

android:layout_width="30dp"
android:layout_height="20dp"
android:text="-"

android:background="@drawable/bg_btn_ripple_dark"
android:textColor="@color/white"
android:textSize="14sp"
android:layout_marginEnd="@dimen/padding_small"

/>


<TextView
android:id="@+id/vip_drinks_amount"
android:layout_toEndOf="@+id/vip_drinks_btn_minus"


android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/white"
android:fontFamily="@font/mont_light"
android:textSize="@dimen/text_normal"
android:layout_marginEnd="@dimen/padding_small"
/>


<Button
android:id="@+id/vip_drinks_btn_plus"
android:layout_toEndOf="@+id/vip_drinks_amount"

android:layout_width="30dp"
android:layout_height="20dp"
android:text="+"
android:background="@drawable/bg_btn_ripple_dark"
android:textColor="@color/white"
android:textSize="14sp"
android:layout_marginEnd="@dimen/padding_small"

/>


<TextView
android:id="@+id/lblListItemDrinksFinalPrice"
android:layout_toEndOf="@id/vip_drinks_btn_plus"
android:textSize="@dimen/text_normal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="@font/mont_light"
android:textColor="@color/Textwhite"

/>
</RelativeLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

最佳答案

添加一个新类SelectedDrink,如下所示:

public class SelectedDrink {
String content;
int qty;
}

然后尝试这个适配器代码:

public class ExpandableListAdapterDrinks extends BaseExpandableListAdapter {

private Context context;
private List<Drink> drinksList;

private Button btReset, btOk;
private List<Integer> groupSum;
private List<List<Integer>> qty;
private int totalSum = 0;

class ViewHolder {
TextView childText,counterText, childUnitPrice, childFinalPrice;
Button btn_plus,btn_minus;
}

class Pos{
int group;
int child;
Pos(int group, int child){
this.group = group;
this.child = child;
}
}

public ExpandableListAdapterDrinks(Context context, List<Drink> drinksList,
Button btReset, Button btOk) {
this.context = context;
this.drinksList= drinksList;
this.btReset = btReset;
this.btOk = btOk;

groupSum = new ArrayList<>();
qty = new ArrayList<>();
for(int i=0; i<drinksList.size(); i++) {
groupSum.add(0);
List<Integer> orderedQty = new ArrayList<>();
for(int j=0; j<drinksList.get(i).getContent().size(); j++) orderedQty.add(0);
qty.add(orderedQty);
}
}

private void resetGroupSum(int groupPosition) {
totalSum -= groupSum.get(groupPosition);
groupSum.set(groupPosition, 0);
resetGroupChildrenQty(groupPosition);
}

private void resetGroupChildrenQty(int groupPosition) {
for(int i=0; i<qty.get(groupPosition).size(); i++) qty.get(groupPosition).set(i, 0);
}

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

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

@Override
public Drink getGroup(int groupPosition) {
return drinksList.get(groupPosition);
}

@Override
public String getChild(int groupPosition, int childPosition) {
return drinksList.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(int groupPosition, boolean isExpanded, View view, ViewGroup parent) {
String headerTitle = drinksList.get(groupPosition).getTitle();

/** HEADER TEXT HERE */
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);

if(groupSum.get(groupPosition) > 0){
lblListHeaderPrice.setVisibility(View.VISIBLE);
lblListHeaderPrice.setText(String.format("%.02f", (float)groupSum.get(groupPosition)).replace(".", ",") + "€");
}else{
lblListHeaderPrice.setVisibility(View.GONE);
lblListHeaderButton.setVisibility(View.GONE);
}

if(!drinksList.get(groupPosition).getBg().get(0).isEmpty() || !drinksList.get(groupPosition).getBg().get(1).isEmpty() ) {
List<String> colorGradientTopBottom = drinksList.get(groupPosition).getBg();
int[] colors = {Color.parseColor(colorGradientTopBottom.get(0)),Color.parseColor(colorGradientTopBottom.get(1))};
GradientDrawable gd = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, colors);
gd.setCornerRadius(0f);
bgcolor.setBackground(gd);
} else {
//bgcolor.setBackgroundColor(ContextCompat.getColor(context, R.color.cardview_bg));
}
lblListHeader.setText(headerTitle);

return view;
}

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

/** Drinks List */
ViewHolder viewHolder;

String childDrink = getChild(groupPosition, childPosition);
int childPrice = getGroup(groupPosition).getPricelist().get(childPosition);

if (view == null) {
LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.vip_drinks_listitem, null);

viewHolder = new ViewHolder();
viewHolder.childText = view.findViewById(R.id.lblListItemDrinks);
viewHolder.childUnitPrice = view.findViewById(R.id.lblListItemDrinksUnitPrice);
viewHolder.counterText = view.findViewById(R.id.vip_drinks_amount);
viewHolder.childFinalPrice = view.findViewById(R.id.lblListItemDrinksFinalPrice);
viewHolder.btn_plus = view.findViewById(R.id.vip_drinks_btn_plus);
viewHolder.btn_minus = view.findViewById(R.id.vip_drinks_btn_minus);

viewHolder.btn_plus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Pos pos = (Pos) v.getTag();
int orderedQty = qty.get(pos.group).get(pos.child);
orderedQty++;
qty.get((pos.group)).set(pos.child, orderedQty);
groupSum.set(pos.group, groupSum.get(pos.group) + getGroup(pos.group).getPricelist().get(pos.child));
notifyDataSetChanged();
totalSum += getGroup(pos.group).getPricelist().get(pos.child);
btOk.setText(String.format("%.02f", (float)totalSum).replace(".", ",") + "€");
btReset.setEnabled(true);
}
});

viewHolder.btn_minus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Pos pos = (Pos) v.getTag();
int orderedQty = qty.get(pos.group).get(pos.child);
if (orderedQty > 0) {
orderedQty--;
qty.get((pos.group)).set(pos.child, orderedQty);
groupSum.set(pos.group, groupSum.get(pos.group) - getGroup(pos.group).getPricelist().get(pos.child));
notifyDataSetChanged();
totalSum -= getGroup(pos.group).getPricelist().get(pos.child);
if (totalSum == 0) resetTotalSum();
else btOk.setText(String.format("%.02f", (float)totalSum).replace(".", ",") + "€");
}
}
});
} else {
viewHolder = (ViewHolder) view.getTag();
}

viewHolder.childText.setText(childDrink);
viewHolder.childUnitPrice.setText(String.format("%.02f", (float)childPrice).replace(".", ",") + "€");
int orderedQty = qty.get(groupPosition).get(childPosition);
viewHolder.counterText.setText(String.valueOf(orderedQty));
viewHolder.childFinalPrice.setText(String.format("%.02f", (float)orderedQty*childPrice).replace(".", ",") + "€");

viewHolder.btn_minus.setTag(new Pos(groupPosition, childPosition));
viewHolder.btn_plus.setTag(new Pos(groupPosition, childPosition));
view.setTag(viewHolder);
return view;
}

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

public void resetTotalSum() {
for(int i=0; i<drinksList.size(); i++) {
resetGroupSum(i);
}
notifyDataSetChanged();
btReset.setEnabled(false);
btOk.setText(String.valueOf(0));
}

public ArrayList<SelectedDrink> getOrderList() {
ArrayList<SelectedDrink> orderList = new ArrayList<>();
for(int i=0; i<drinksList.size(); i++) {
for(int j=0; j<drinksList.get(i).getContent().size(); j++) {
if(qty.get(i).get(j) > 0) {
SelectedDrink selectedDrink = new SelectedDrink();
selectedDrink.content = getGroup(i).getContent().get(j);
selectedDrink.qty = qty.get(i).get(j);
orderList.add(selectedDrink);
}
}
}
return orderList;
}
}

我用这个 Activity 测试了上面的内容:

public class MainActivity extends AppCompatActivity {
final private static int NUM_OF_GROUP = 5;
List<Drink> drinksList;
ExpandableListView listView;
ExpandableListAdapterDrinks expandableListAdapterDrinks;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btRest = findViewById(R.id.btReset);
Button btOk = findViewById(R.id.btOK);
listView = findViewById(R.id.elvDrinks);

initDataList();
expandableListAdapterDrinks =
new ExpandableListAdapterDrinks(getApplicationContext(), drinksList, btRest, btOk);
listView.setAdapter(expandableListAdapterDrinks);
listView.expandGroup(0);

btRest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
expandableListAdapterDrinks.resetTotalSum();
for(int i=0; i<drinksList.size(); i++) listView.collapseGroup(i);
listView.expandGroup(0);
}
});
btOk.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String msg = "Nothing Selected";
Button button = (Button)view;
if(!button.getText().equals("0")) {
msg = "Upload!\n";
ArrayList<SelectedDrink> selectedDrinks = expandableListAdapterDrinks.getOrderList();
for(SelectedDrink selectedDrink: selectedDrinks) {
msg += selectedDrink.content + " " + selectedDrink.qty + "\n";
}
msg += "Total: " + button.getText();
}
Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();
}
});
}

private void initDataList(){
drinksList = new ArrayList<>();
List<String> content;
List<Integer> pricelist;
List<String> bg;
for(int i=1; i<=NUM_OF_GROUP; i++) {
content = new ArrayList<>();
pricelist = new ArrayList<>();
bg = new ArrayList<>();
for(int j = 1; j<(NUM_OF_GROUP + new Random().nextInt(5)); j++){
content.add("Drink " + i + "-" + j);
pricelist.add(new Random().nextInt(1000));
bg.add("#008577");
bg.add("#D81B60");
}
Drink drink = new Drink();
drink.setTitle("Group " + i);
drink.setContent(content);
drink.setPricelist(pricelist);
drink.setBg(bg);
drinksList.add(drink);
}
}
}

这个布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<LinearLayout
android:id="@+id/llBtns"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal">

<Button
android:id="@+id/btReset"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:enabled="false"
android:text="Reset" />

<Button
android:id="@+id/btOK"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="0" />
</LinearLayout>

<ExpandableListView
android:id="@+id/elvDrinks"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/llBtns">
</ExpandableListView>

</RelativeLayout>

此外,还需要您的 Drink 类、vip_package_listgroup.xmlvip_drinks_listitem.xml。希望有帮助!

关于java - ExpandableListView:从子项获取输入值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56041286/

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