android_ExpandableListView 下拉列表使用

最新推荐文章于 2021-05-31 11:07:43 发布

原创最新推荐文章于 2021-05-31 11:07:43 发布 · 1.9k 阅读

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#android #expandablelistview

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本文将为您详细介绍ExpandableListView的使用方法，包括其基本结构、适配器实现及示例代码，帮助您快速掌握这一功能强大的列表组件。

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总结一下ExpandableListView的使用

ExpandableListView与ListView用法差不多，它也有自己的适配器，可以根据自己的需求继承BaseExpandableListAdapter，自己写适配器

先上效果图

和ListView用法差不多，从项目中摘的代码

   <span style="white-space:pre">		</span>inEditText = (EditText) findViewById(R.id.infusion_et_in);

		e_lv = (ExpandableListView) findViewById(R.id.infusion_elv);

		e_lv.setAdapter(new InfusionParentAdapter(getApplication()));

public class InfusionParentAdapter extends BaseExpandableListAdapter {

	private Context context;
	private String[] generalsTypes = new String[] { "张三", "李四" };
	private String[][] generals = new String[][] { { "1", "2", "3" },
			{ "4", "5", "6" } };

	public InfusionParentAdapter() {
	}

	public InfusionParentAdapter(Context context) {
		this.context = context;
	}

	@Override
	public Object getChild(int groupPosition, int childPosition) {
		// TODO Auto-generated method stub
		return generals[groupPosition][childPosition];
	}

	@Override
	public long getChildId(int groupPosition, int childPosition) {
		// TODO Auto-generated method stub
		return childPosition;
	}

	@Override
	public View getChildView(int groupPosition, int childPosition,
			boolean isLastChild, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		convertView = LayoutInflater.from(context).inflate(
				R.layout.list_item_child, null);
		return convertView;
	}

	@Override
	public int getChildrenCount(int groupPosition) {
		// TODO Auto-generated method stub
		return generals[0].length;
	}

	@Override
	public Object getGroup(int groupPosition) {
		// TODO Auto-generated method stub
		return generalsTypes[groupPosition];
	}

	@Override
	public int getGroupCount() {
		// TODO Auto-generated method stub
		return generalsTypes.length;
	}

	@Override
	public long getGroupId(int groupPosition) {
		// TODO Auto-generated method stub
		return groupPosition;
	}

	@Override
	public View getGroupView(int groupPosition, boolean isExpanded,
			View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		convertView=LayoutInflater.from(context).inflate(R.layout.list_item_infusion_elistview, null);
		return convertView;
	}

	@Override
	public boolean hasStableIds() {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public boolean isChildSelectable(int groupPosition, int childPosition) {
		// TODO Auto-generated method stub
		return false;
	}

}

其中parent表示扩展的ListView,Child表示下拉列表的内容，其余的跟ListView用法一样了