可扩展的ListView

【实例简介】可扩展的ListView

【实例截图】

【核心代码】

public class MainActivity extends Activity {
private ExpandableListView listView;
private List<String> group;
private List<List<String>> child;
private MyAdapter adapter;

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

listView = (ExpandableListView) findViewById(R.id.expandableListView);
/**
* 初始化数据 
*/
initData();
adapter = new MyAdapter(this,group,child);
listView.setAdapter(adapter);

}

private void initData() {
group = new ArrayList<String>();
child = new ArrayList<List<String>>();
addInfo("北京",new String[]{"朝阳","海淀","东城区","西城区"});
addInfo("河北", new String[]{"邯郸","石家庄","邢台"});
addInfo("广东", new String[]{"广州","深圳","珠海"});
}

/**
* 添加数据信息
* @param g
* @param c
*/
private void addInfo(String g,String[] c) {
group.add(g);
List<String> list = new ArrayList<String>();
for (int i = 0; i < c.length; i ) {
list.add(c[i]);
}
child.add(list);
}

}

public class MyAdapter extends BaseExpandableListAdapter {
private Context context;
private List<String> group;
private List<List<String>> child;

public MyAdapter(Context context, List<String> group,
List<List<String>> child) {
this.context = context;
this.group = group;
this.child = child;
}

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

@Override
public int getChildrenCount(int groupPosition) {
return child.size();
}

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

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

/**
* 显示：group
*/
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(
R.layout.list_item, null);
holder = new ViewHolder();
holder.textView = (TextView) convertView
.findViewById(R.id.textView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(group.get(groupPosition));
holder.textView.setTextSize(25);
holder.textView.setPadding(36, 10, 0, 10);
return convertView;

}

/**
* 显示：child
*/
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(
R.layout.list_item, null);
holder = new ViewHolder();
holder.textView = (TextView) convertView
.findViewById(R.id.textView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(child.get(groupPosition).get(childPosition));
holder.textView.setTextSize(20);
holder.textView.setPadding(72, 10, 0, 10);
return convertView;
}

class ViewHolder {
TextView textView;
}

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

}