ExpandableListView使用

最新推荐文章于 2023-05-13 11:19:20 发布

原创最新推荐文章于 2023-05-13 11:19:20 发布 · 268 阅读

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#expandablelistview

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本文提供了一个关于如何在Android应用中使用ExpandableListView的详细示例。通过自定义Adapter，展示了如何实现分组数据和子项数据的显示，并且设置点击监听器来响应用户的操作。

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public class MainActivity extends Activity {

    private ExpandableListView lv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv=(ExpandableListView) findViewById(R.id.exlistview);
        MyAdapter adapter=new MyAdapter(this);
        lv.setAdapter(adapter);
        lv.setOnChildClickListener(new OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView arg0, View arg1, int arg2,
                    int arg3, long arg4) {
                // TODO Auto-generated method stub
                return false;
            }
        });
    }


}

自定义adapter

public class MyAdapter extends BaseExpandableListAdapter{

    private Context context;
    private String [] st={"家人","朋友"};
    private String [][] fimily={{"爸爸","妈妈","哥哥"},{"小王","小明","小红"}};
    MyAdapter(Context context){
        this.context=context;
    }
    @Override
    public Object getChild(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return fimily[arg0][arg1];
    }

    @Override
    public long getChildId(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return arg1;
    }



    @Override
    public int getChildrenCount(int arg0) {
        // TODO Auto-generated method stub
        return fimily[arg0].length;
    }

    @Override
    public Object getGroup(int arg0) {
        // TODO Auto-generated method stub
        return st[arg0];
    }

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

    @Override
    public long getGroupId(int arg0) {

        return arg0;
    }

    @Override
    public View getChildView(int arg0, int arg1, boolean arg2, View convertView,
            ViewGroup arg4) {
        viewHolder holder;
        if(convertView==null){
            LayoutInflater inflater = LayoutInflater.from(context);
            convertView = inflater.inflate(R.layout.childview, null);
            holder=new viewHolder();
            holder.tv=(TextView) convertView.findViewById(R.id.title);
            convertView.setTag(holder);
        }else{
            holder=(viewHolder) convertView.getTag();
        }
        holder.tv.setText(fimily[arg0][arg1]);
        return convertView;
    }

    @Override
    public View getGroupView(int arg0, boolean arg1, View convertView, ViewGroup v) {
        viewHolder holder;
        if(convertView==null){
            LayoutInflater inflater = LayoutInflater.from(context);
            convertView = inflater.inflate(R.layout.grovview, null);
            holder=new viewHolder();
            holder.tv=(TextView) convertView.findViewById(R.id.titles);
            convertView.setTag(holder);
        }else{
            holder=(viewHolder) convertView.getTag();
        }
        holder.tv.setText(st[arg0]);
        return convertView;
    }


    @Override
    public boolean isChildSelectable(int arg0, int arg1) {
        // 二级标签能否被选中
        return true;
    }

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

    class viewHolder{
        TextView tv;
    }

}