android--自定义ExpandableListView+隐藏指示器图片+防数据显示混乱

类似于ListView，自定义ExpandableListView只需要写一个适配器类(继承自BaseExpandableListAdapter即可)：

import java.util.List;
import java.util.zip.Inflater;

import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
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;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.LinearLayout;

public class MExpandableListViewAdapter extends BaseExpandableListAdapter{

private Activity mActivity;
private List<String> listGroups;
private List<List<String>> listChilds;

public MExpandableListViewAdapter(
Activity mActivity, List<String> listGroups,
List<List<String>> listChilds) {
this.mActivity = mActivity;
this.listGroups = listGroups;
this.listChilds = listChilds;
}

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

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

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView,
ViewGroup parent) {
ChildViewHolder childViewHolder;
View view = convertView;
if (view ==null) {
childViewHolder = new ChildViewHolder();
view = LayoutInflater.from(mActivity).inflate(R.layout.list_item_detail, null);
}else{
childViewHolder = (ChildViewHolder) view.getTag();
}
TextView tView = (TextView) view.findViewById(R.id.tv_content_helper_item_list_detail);
tView.setText(listChilds.get(groupPosition).get(0));
view.setTag(childViewHolder);
return view;
}

class ChildViewHolder{
LinearLayout llytContent;
TextView tvAnswer;
}

@Override
public int getChildrenCount(int arg0) {
return listChilds.get(arg0).size();
}

@Override
public Object getGroup(int arg0) {
return listGroups.get(arg0);
}

@Override
public int getGroupCount() {
if (listGroups!=null) {
return listGroups.size();
}
return 0;
}

@Override
public long getGroupId(int arg0) {
return arg0;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
GroupViewHolder groupViewHolder;
if (convertView==null) {
groupViewHolder = new GroupViewHolder();
convertView = LayoutInflater.from(mActivity).inflate(R.layout.list_item, null);
convertView.setTag(groupViewHolder);
}
else{
groupViewHolder = (GroupViewHolder) convertView.getTag();
}
TextView tView = (TextView) convertView.findViewById(R.id.tv_title_helper_item_list);
tView.setText(listGroups.get(groupPosition));
View viewArrow = convertView.findViewById(R.id.viewArrow);
if (isExpanded) {
viewArrow.setBackgroundDrawable(mActivity.getResources().getDrawable(
R.drawable.bg_arrow_round_d));
}
else{
viewArrow.setBackgroundDrawable(mActivity.getResources().getDrawable(
R.drawable.bg_arrow_round));
}

return convertView;
}

class GroupViewHolder{
TextView tvQuestion;
}

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

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}

@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);

}

}

其中list_item.xml布局文件的内容为：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="horizontal"
android:paddingTop="2dp" >

<TextView
android:id="@+id/tv_title_helper_item_list"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="15dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="15dp"
android:layout_weight="1"
android:textColor="@color/color_bg_index"
android:textSize="16sp"
android:textStyle="bold" />

<View
android:id="@+id/viewArrow"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:layout_marginRight="15dp"
android:background="@drawable/bg_arrow_round" />
</LinearLayout>

其中list_item_detail.xml布局文件的内容为：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/color_bg"
android:orientation="vertical"
android:paddingRight="10dp"
>

<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@drawable/bg_border" />

<TextView
android:id="@+id/tv_content_helper_item_list_detail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="10dp"
android:textColor="@color/color_text"
android:textSize="14sp" />
</LinearLayout>

如果不想显示指示图标(箭头)，需要在主activity绑定的layout文件中设置groupIndicator为透明颜色即可。即<color name="transparent">#00000000</color>。

<ExpandableListView
android:id="@+id/list_view_helper"
android:layout_width="match_parent"
android:layout_height="0dp"
android:scrollbars="none"
android:fadingEdge="none"
android:groupIndicator="@color/transparent"
android:layout_weight="1"
android:cacheColorHint="#00000000"
android:dividerHeight="1dp"
android:footerDividersEnabled="false" />

其中bg_arrow_round和bg_arrow_round_d分别为向右和向下的箭头：