程序运行后，不崩溃但一片空白

Question

 package com.example.leadus;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;

public class SjcsActivity extends Activity {
    private ListView lis;
    private List<String> list;
    private MyAdapter myadapter;
    private List<Map<String, Object>> datalist;
    private  ArrayAdapter<String> adapter;

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

            list =new ArrayList<String>();
            list.add("北京");
            list.add("上海");
            list.add("广州");
            list.add("深圳");

            adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,list);
            //adapter设置一个下拉列表的样式
            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

            lis = (ListView) findViewById(R.id.listView);
            datalist=new ArrayList<Map<String,Object>>();
            myadapter = new MyAdapter(this,datalist);
            lis.setAdapter(myadapter);
           // lis.setOnItemClickListener((AdapterView.OnItemClickListener) this);
           // lis.setOnScrollListener((AbsListView.OnScrollListener) this);
    }

    private List<Map<String, Object>> getData() {
        for (int i = 1; i <7; i++) {
            String[]arr={"","A","B","C","D","E","F"};
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("listView_text1",i);
            map.put("listView_text2", "主"+arr[i] );
            map.put("listView_spinner1",i);
            datalist.add(map);

        }
        return datalist;
    }

    public class MyAdapter extends BaseAdapter {
        private Context context;
        private ArrayList<Map<String,Object>> datalist;
        private LayoutInflater inflater;

        public MyAdapter(Context context,List<Map<String, Object>> datalist) {
            this.context=context;
            this.inflater=LayoutInflater.from(context);
            this.datalist=(ArrayList<Map<String,Object>>)datalist;

        }

        @Override
        public int getCount()
        {
            return datalist.size();
        }

        @Override
        public Object getItem(int position)
        {
            return datalist.get(position);
        }

        @Override
        public long getItemId(int position)
        {
            return position;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = null;
            ViewHolder viewHolder = null;
            if (convertView == null) {
                view =inflater.inflate(R.layout.shijianceshi_listviewlayout, null);
                viewHolder = new ViewHolder();
                viewHolder.tv1=(TextView)view.findViewById(R.id.listView_text1);
                viewHolder.tv2=(TextView)view.findViewById(R.id.listView_text2);
                viewHolder.spinner1= (Spinner)view.findViewById(R.id.listView_spinner1);
                view.setTag(viewHolder);
            } else {
                view = convertView;
                viewHolder=(ViewHolder)view.getTag();
            }

            viewHolder.tv1.setVisibility(View.VISIBLE);
            viewHolder.tv2.setVisibility(View.VISIBLE);
            viewHolder.tv1.setText(String.valueOf(datalist.get(position).get("listView_text1")));
            viewHolder.tv2.setText(String.valueOf(datalist.get(position).get("listView_text2")));
            viewHolder.spinner1.setAdapter(adapter);
            return view;
        }

        public class ViewHolder {
            TextView tv1;
            TextView tv2;
            Spinner spinner1;
            //你的view中的控件
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.sjcs, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

Answer 1

代码逻辑如下，具体值根据你的情况而定。

datalist=new ArrayList<Map<String,Object>>();

Map<String, Object> map1 = new HashMap<String, Object>();
map1.put("name", "Y");
map1.put("num", 1);

Map<String, Object> map2 = new HashMap<String, Object>();
map2.put("name", "A");
map2.put("num", 3);

Map<String, Object> map3 = new HashMap<String, Object>();
map3.put("name", "D");
map3.put("num", 2);


datalist.add(map1);
datalist.add(map2);
datalist.add(map3);