listview 问题请教

Question

试着在做listview实例代码如下：
main.xml<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
    <ListView 
     android:id="@+id/myslist"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content" 
      />
</LinearLayout>
listfile.xml<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
<TextView     android:text="TextView01"     android:layout_height="wrap_content"     android:textSize="20dip"     android:layout_width="fill_parent"     android:id="@+id/username"    /><TextView         android:text="TextView02"         android:layout_height="wrap_content"         android:layout_width="fill_parent"         android:id="@+id/userid"        /></LinearLayout>listview.javapackage listview.pack;import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import java.util.ArrayList;  
import java.util.HashMap;  
import java.util.Map;
import android.widget.ArrayAdapter;public class listview extends Activity {
    /** Called when the activity is first created. */
private ListView LV;

@Override    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ListView list = (ListView) findViewById(R.id.myslist);        ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();
        HashMap<String, Object> map = new HashMap<String, Object>();        HashMap <String,Object> item1=new HashMap <String,Object>();
item1.put("ID","1");
item1.put("name","one");
HashMap <String,Object> item2=new HashMap <String,Object>();
item2.put("id","2");
item2.put("name","two");
listItem.add(item1);
listItem.add(item2);
        LV = new ListView(this);  
        SimpleAdapter listAdapter = new SimpleAdapter(this,listItem,R.layout.listfile,new String[] {"userid","username"},new int[] {R.id.userid,R.id.username }        );
        LV.setAdapter(listAdapter);  
        //setContentView(LV);  
    }
}运行后没有报错，但也没有显示listview信息。不知道为什么。

Answer 1

 ListView list = (ListView) findViewById(R.id.myslist);
......
 LV = new ListView(this);
楼主太马虎了。等散分。来自android.growprogress.com

Answer 2

修改后的java文件
package listview.pack;import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import java.util.ArrayList;  
import java.util.HashMap;  public class listview extends Activity {
    /** Called when the activity is first created. */

@Override    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ListView list = (ListView) findViewById(R.id.myslist);        ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();        HashMap <String,Object> item1=new HashMap <String,Object>();
item1.put("userid","1");
item1.put("username","one");
HashMap <String,Object> item2=new HashMap <String,Object>();
item2.put("userid","2");
item2.put("username","two");
listItem.add(item1);
listItem.add(item2);
        SimpleAdapter listAdapter = new SimpleAdapter(this,listItem,R.layout.listfile,new String[] {"userid","username"},new int[] {R.id.userid,R.id.username }        );
        list.setAdapter(listAdapter);  
        //setContentView(LV);  
    }
}
谢谢！

Answer 3

键也错了        item1.put("userid","1");
        item1.put("username","one");
        HashMap <String,Object> item2=new HashMap <String,Object>();
        item2.put("userid","2");
        item2.put("username","two");
        listItem.add(item1);
        listItem.add(item2);
         // LV = new ListView(this);   
        SimpleAdapter listAdapter = new SimpleAdapter(this,listItem,R.layout.listfile,new String[] {"userid","username"},new int[] {R.id.userid,R.id.username } );
        list.setAdapter(listAdapter);