我已经实现了一个自定义的ExpandableListView，但它没有显示任何数据。
这是我的布局。
activity_cust_mainlist.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/tv_cust_salesRep"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="94dp"
android:gravity="left"
android:text="sales man"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/tv_cust_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/tv_cust_salesRep"
android:gravity="center"
android:text="Lista de Clientes"
android:textAppearance="?android:attr/textAppearanceMedium" />
<LinearLayout
android:id="@+id/lin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/tv_cust_header"
android:layout_centerHorizontal="true"
android:weightSum="11" >
<TextView
android:id="@+id/tv_custtime"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="3"
android:gravity="center"
android:text="Horario"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/tv_custid"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:gravity="center"
android:text="Cod"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/tv_custname"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="6"
android:gravity="center"
android:text="Nombre"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
<ExpandableListView
android:id="@+id/eLV_customers"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/lin" >
</ExpandableListView>
</RelativeLayout>
activity_cust_group_list.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="11">
<TextView
android:id="@+id/tv_custList_Time"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="3"
android:gravity="center"
android:text="Horario"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/tv_custList_id"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:gravity="center"
android:text="Cod"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/tv_custList_Name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="6"
android:gravity="center"
android:text="Nombre"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
activity_cust_child_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/tv_clildList_refe"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="REFE"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
实际代码：CustomerActivity
package com.dhiraj.mpos;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
public class CustomerActivity extends Activity {
private ArrayList<String> parentItems;
private ArrayList<Object> childItems;
ExpandableListView listView;
ExpandableListAdapter listAdapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cust_temp);
parentItems = new ArrayList<String>();
childItems = new ArrayList<Object>();
setGroupParents();
setChildData();
listView = (ExpandableListView) findViewById(R.id.eLV_customers);
listAdapter = new MyCustomExpandableAdapter(parentItems, childItems);
listView.setAdapter(listAdapter);
Log.i("dhiraj", "adapter set");
}
private class MyCustomExpandableAdapter extends BaseExpandableListAdapter {
ArrayList<String> parent,child;
ArrayList<Object> children;
MyCustomExpandableAdapter(ArrayList<String> parents,
ArrayList<Object> childern) {
this.parent = parents;
this.children = childern;
Log.i("dhiraj", " constructor");
}
@Override
public Object getChild(int arg0, int arg1) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getChildId(int arg0, int arg1) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
child=(ArrayList<String>)children.get(groupPosition);
Log.i("dhiraj", "getChildView : " + child.toString());
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) CustomerActivity.this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.activity_cust_child_list, null);
}
TextView tv1=(TextView)convertView.findViewById(R.id.tv_clildList_refe);
tv1.setText(child.get(childPosition));
return convertView;
}
@Override
public int getChildrenCount(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getGroup(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public long getGroupId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
Log.i("dhiraj", "groupView");
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) CustomerActivity.this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.activity_cust_group_list, null);
}
TextView tv_time = (TextView) convertView
.findViewById(R.id.tv_custList_Time);
TextView tv_id = (TextView) convertView
.findViewById(R.id.tv_custList_id);
TextView tv_name = (TextView) convertView
.findViewById(R.id.tv_custList_Name);
tv_name.setText(this.parent.get(groupPosition));
return convertView;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isChildSelectable(int arg0, int arg1) {
// TODO Auto-generated method stub
return false;
}
}
public void setGroupParents() {
parentItems.add("Fruits");
parentItems.add("Flowers");
parentItems.add("Animals");
parentItems.add("Birds");
Log.i("dhiraj", "group items set");
}
// method to set child data of each parent
public void setChildData() {
// Add Child Items for Fruits
ArrayList<String> child = new ArrayList<String>();
child.add("Apple");
child.add("Mango");
child.add("Banana");
child.add("Orange");
childItems.add(child);
// Add Child Items for Flowers
child = new ArrayList<String>();
child.add("Rose");
child.add("Lotus");
child.add("Jasmine");
child.add("Lily");
childItems.add(child);
// Add Child Items for Animals
child = new ArrayList<String>();
child.add("Lion");
child.add("Tiger");
child.add("Horse");
child.add("Elephant");
childItems.add(child);
// Add Child Items for Birds
child = new ArrayList<String>();
child.add("Parrot");
child.add("Sparrow");
child.add("Peacock");
child.add("Pigeon");
childItems.add(child);
Log.i("dhiraj", "child items set");
}
}
答案 0 :(得分：1)
请注意，在您的适配器中，重写的方法返回0，null .. 他们应该实际返回项目和项目计数，如果您将调试应用程序，您将看到适配器的计数始终为0，所以即使您已完成活动的所有连线，并添加了所有组和孩子的物品，你什么也看不见。
尝试更改getGroupCount（）以返回groupItems.size（），同样更改getChildCount（）
告诉我们是否解决了问题
答案 1 :(得分：1)
你的getChildrenCount返回0，你的getGroupCount也返回0.
您需要修改它以返回每个组的正确计数。