求助 报错是 String text2=listView.getItemAtPosition(position)+"";

Question

package com.example.zeroking.demolistview;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.AbsListView;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.Toast;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener,AbsListView.OnScrollListener{    private ListView listView;    private ArrayAdapter arrayAdapter;    private SimpleAdapter simpleAdapter;    private List<Map<String,Object>> dataList;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ListView listView=(ListView)findViewById(R.id.LV);        String[] arr_data={"慕课1","慕课2","慕课3","慕课4","慕课5","慕课6"};        //新建一个适配器        //new ArrayAdapter(上下问，当前ListView加载每项的布局，数据源)        arrayAdapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1,arr_data);        //listView.setAdapter(arrayAdapter);        dataList=new ArrayList<Map<String,Object>>();        simpleAdapter=new SimpleAdapter(this,getData(),R.layout.simplelayout,new String[]{"pic","text"},new int[]{R.id.pic,R.id.text});        listView.setAdapter(simpleAdapter);        listView.setOnItemClickListener(this);    }    private List<Map<String,Object>> getData(){        for(int i=0;i<20;i++){            Map<String,Object>map=new HashMap<String,Object>();            map.put("pic",R.drawable.gets);            map.put("text","慕课网"+i);            dataList.add(map);        }        /*        Map<String,Object>map1=new HashMap<String,Object>();        map1.put("pic",R.drawable.gets);        map1.put("text","慕课网"+1);        dataList.add(map1);        Map<String,Object>map2=new HashMap<String,Object>();        map2.put("pic",R.drawable.gets);        map2.put("text","哈哈哈哈");        dataList.add(map2);        */        return dataList;    }    @Override    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {        String text2=listView.getItemAtPosition(position)+"";        Toast.makeText(this,"position="+position+" text="+text2,Toast.LENGTH_SHORT).show();        Log.i("toast",String.valueOf(position));    }    @Override    public void onScrollStateChanged(AbsListView view, int scrollState) {    }    @Override    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {    }}

Answer 1

看着没什么问题啊