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                        /Android攻城狮的第二门课（第1季）

为什么我的程序无法点击

package com.example.listview;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.Toast;

public class MainActivity extends Activity implements OnItemClickListener{

private ListView listView;

private ArrayAdapter<String>aar_adapter;

private SimpleAdapter simp_adapter;

private List<Map<String,Object>>datalist;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

String[]arr_data={"慕课网1","慕课网2","慕课网3","慕课网4","慕课网5","慕课网6"};

listView=(ListView) findViewById(R.id.listView);

//Adapter(上下文，当前ListView加载的每一个列表项所对应的布局文件，数据源)

//SimpleAdapter

*context：上下文

*data：数据源 List<? extends Map<String, ?>> data)一个Map所组成的List集合

*每一个Map都会对应ListView列表中的一行

*每一个Map（键-值对）的键必修包含所有在from中所指定的键

*resource：列表下的布局文件ID

*from：Map中的键名

*to：绑定数据视图中的Id

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

aar_adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arr_data);

//listView.setAdapter(aar_adapter);

simp_adapter=new SimpleAdapter(this, getData(), R.layout.item, new String[]{"image","text"}, new int[]{R.id.image,R.id.text});

listView.setAdapter(simp_adapter);

listView.setOnItemClickListener(this);

}

public List<Map<String,Object>> getData()

{

for(int i=1;i<20;i++)

{

Map<String, Object>map=new HashMap<String, Object>();

map.put("image", R.drawable.ic_launcher);

map.put("text", "慕课网"+(i+1));

datalist.add(map);

}

return datalist;

}

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

String text=listView.getItemAtPosition(arg2)+"";

Toast.makeText(this, "position="+arg2+" text="+text, 1).show();

}

过客丶丶问情

2017-12-01

源自：Android攻城狮的第二门课（第1季） 2-7

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1 回答

为彭十七加油oO
2017-12-03

找了一下确实和我没什么不一样。就倒数第四行你没有将texttoString（）。不知道是不是哪里的原因。我将我的代码贴出来你看一下吧：

package text.xu.com.listview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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 lViewe;
private ArrayAdapter<String> aAdapter;
private SimpleAdapter sAdapter;
private List<Map<String,Object>> dataList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//String[] astring={"xu","xuu","xuuu"};
//aAdapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, astring);
// lViewe.setAdapter(aAdapter);

dataList=new ArrayList<Map<String, Object>>();
lViewe=(ListView) findViewById(R.id.listView);
sAdapter=new SimpleAdapter(this,getData(),R.layout.item,new String[]{"pic","text"},new int[]{R.id.pic,R.id.text});
lViewe.setAdapter(sAdapter);
lViewe.setOnItemClickListener(this);
lViewe.setOnScrollListener(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.ic_launcher);
map.put("text", "机器人"+i);
dataList.add(map);
}
return dataList;
}
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
String str1= lViewe.getItemAtPosition(position).toString();
Toast.makeText(this,"position"+position+" text"+str1,Toast.LENGTH_SHORT).show();
}
@Override
public void onScrollStateChanged(AbsListView absListView, int scollstate) {
switch (scollstate){
case SCROLL_STATE_FLING:
Log.e("scroll","手指离开仍继续滑动");
break;
case SCROLL_STATE_IDLE:
Log.e("scroll","停止滑动");
break;
case SCROLL_STATE_TOUCH_SCROLL:
Log.e("scroll","使用手指滑动");
Map<String,Object> map=new HashMap<String, Object>();
map.put("pic",R.drawable.ic_launcher);
map.put("text","小小机器人呦吼");
dataList.add(map);
sAdapter.notifyDataSetChanged();
break;
}
}
@Override
public void onScroll(AbsListView absListView, int i, int i1, int i2) {
}
}