XML中的ExpandableListView定义

I run into this two days ago. 我的解决方案是:

第一次推广 ExpandableListActivity 并重写onCreate()方法,如下所示:

public class ExpandableExample extends ExpandableListActivity {
    @Override
    public void onCreate() {
        super.onCreate(savedInstanceState);
        setListAdapter(new BaseExpandableListAdapterExample());
    }
}

定义 BaseExpanableListAdapterExample 是(内部类 ExpandableExample ):

protected class BaseExpandableListAdapterExample extends BaseExpandableListAdapter {
}

然后你需要实施 getChildView 和 getGroupView . 我所做的是:

public View getGroupView(int groupPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {
    View groupRow = getLayoutInflater().inflate(R.layout.group_row, null);
    TextView textView = (TextView) groupRow.findViewById(R.id.text_group);
    textView.setText(getGroup(groupPosition).toString());
    return groupRow;
}

public View getChildView(int groupPosition, int childPosition,
                         boolean isLastChild, View convertView, ViewGroup parent) {
    View childRow = getLayoutInflater().inflate(R.layout.child_row, null);
    TextView textView = (TextView) childRow.findViewById(R.id.text_child);
    textView.setText(getChild(groupPosition, childPosition).toString());
    return childRow;
}

然后你需要定义两者 group_row.xml 和 child_row.xml 在下面 /res/layout/ 目录。例如,我的 GROMP.ROW.XML 如下:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    <TextView
        android:id="@+id/text_element"
        android:layout_width="fill_parent"
        android:layout_height="48dip"
        android:textSize="20sp"
        android:textColor="#fff"
        android:layout_marginLeft="48dip"
        android:gravity="center_vertical" />
</RelativeLayout>

希望它有帮助。如果您有任何问题,请发表评论。