ExpandableListView 使用及设置监听函数

直接贴代码（原谅中二的我）

public class MyExpandableListView extends Activity{
private ExpandableListView listView;
private TextView childView,groupView;
private ImageView imageView;
private  LinearLayout linearLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.expandablelistview);
initview();

listView = (ExpandableListView)findViewById(R.id.expandablelistview);
linearLayout = (LinearLayout)findViewById(R.id.layout);

final int[] img = new int[]{
R.mipmap.a,
R.mipmap.b,
R.mipmap.c
};

final String[] title = new String[]{
"物语系列","FATE ZERO","钢之炼金术"
};

final String[][] str = new String[][]{
{"阿拉拉垃圾君","战场原","八九寺"},
{"卫宫切嗣","saber","金闪闪"},
{"艾德","艾尔","大佐"}
};

ExpandableListAdapter expandableListAdapter = new ExpandableListAdapter() {
@Override
public void registerDataSetObserver(DataSetObserver observer) {

}

@Override
public void unregisterDataSetObserver(DataSetObserver observer) {

}

@Override
public int getGroupCount() {
return title.length;
}

@Override
public int getChildrenCount(int groupPosition) {
return str[groupPosition].length;
}

@Override
public Object getGroup(int groupPosition) {
return title;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
return str[groupPosition][childPosition];
}

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

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

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

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
final View view2 = LayoutInflater.from(MyExpandableListView.this).inflate(R.layout.groupview,null);
groupView = (TextView)view2.findViewById(R.id.groupview);
imageView = (ImageView)view2.findViewById(R.id.imageview);
imageView.setImageResource(img[groupPosition]);
groupView.setText(title[groupPosition]);
return view2;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
View view1 = LayoutInflater.from(MyExpandableListView.this).inflate(R.layout.childview,null);
childView = (TextView)view1.findViewById(R.id.childview);
childView.setText(str[groupPosition][childPosition]);
return childView;
}

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

@Override
public boolean areAllItemsEnabled() {
return true;
}

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

@Override
public void onGroupExpanded(int groupPosition) {

}

@Override
public void onGroupCollapsed(int groupPosition) {

}

@Override
public long getCombinedChildId(long groupId, long childId) {
return 0;
}

@Override
public long getCombinedGroupId(long groupId) {
return 0;
}
};
listView.setAdapter(expandableListAdapter);

listView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
Log.i(""+MyExpandableListView.this, "group " + groupPosition + " child " + childPosition);
return false;
}
});

listView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
Log.i("" + MyExpandableListView.this, "group " + groupPosition );
return false;
}
});
}
}

注意getChildView和getGroupView中的view声明必须在内部，相当于每次创建表项都new一个view来显示，否则会后只是会显示最后一个group和最后一个child。

expandablelistview：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ExpandableListView
android:id="@+id/expandablelistview"
android:layout_width="match_parent"
android:layout_height="match_parent"></ExpandableListView>
</LinearLayout>

childview

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

groupview：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/imageview"
android:layout_width="50dp"
android:layout_height="50dp" />
<TextView
android:id="@+id/groupview"
android:layout_width="match_parent"
android:layout_height="50dp" />
</LinearLayout>

其中几个重要的方法

1、getGroupCount()

返回包含的组列表项的数量。

2、getGroupView()

该方法将返回的View对象将作为组列表项

3、getChildCount()

该方法返回特定组所包含的子列表项的数量

4、getChildView()

该方法返回的View对象将作为特定组、特定位置的子列表项

5、isChildSelectable()

该方法返回true时，可以对子列表项设置监听

监听函数

1、listView.setOnChildClickListener(）

监听子列表项按下事件

2、setOnGroupClickListener()

监听组列表项按下事件

注意：setOnGroupClickListener()返回值必须为false时，才可以正确监听（但是并没搞懂为什么）

这是OnGroupClickListener的api介绍

onChildClick

boolean onChildClick(ExpandableListView parent,

View v,

int groupPosition,

int childPosition,

long id)

Callback method to be invoked when a child in this expandable list hasbeen clicked.

参数：

parent - The ExpandableListView where the click happened

v - The view within the expandable list/ListView that was clicked

groupPosition - The group position that contains the child thatwas clicked

childPosition - The child position within the group

id - The row id of the child that was clicked

返回：

True if the click was handled

但是最后意思是 如果事件被处理返回true，有点搞不懂。