layout中listview占据了整个界面，其余控件全部隐藏，xml文件怎么改都没用

Question

layout中listview占据了整个界面，其余控件全部隐藏，xml文件怎么改都没用，只要listview有数据，就看不到添加的BUTTON或者EXITVIEW了。

布局文件：

<?xml version="1.0" encoding="utf-8"?>

xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>

<Button
    android:id="@+id/btshanchu"
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"
    android:text="删除" 
   />


<ListView  
    android:id="@+id/Lziliao"  
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content"  
    android:layout_below="@id/btshanchu"/>

java文件：

package com.example.huclass;

import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;

public class GuanliActivity extends Activity {

 private ListView listView; 
              @Override  
    public void onCreate(Bundle savedInstanceState){  
        super.onCreate(savedInstanceState);  

        listView = new ListView(this);         
        //android.R.layout.simple_list_item_1是系统定义好的布局文件只显示一行文字  
        listView.setAdapter((ListAdapter) new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1,getData()));  
        setContentView(listView);  

        listView.setAdapter(new ArrayAdapter<String>(this,  
                android.R.layout.simple_list_item_multiple_choice, getData()));  

        listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);}

private List getData(){

        List<String> data = new ArrayList<String>();  
        data.add("【计算机网络】数据链路层");  
        data.add("【计算机网络】应用层");  
        data.add("【信息论】香农定理");  
        data.add("【概率论】总结");  

        return data;  
    }  

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

setContentView(listView);

里面那个listview改成你xml的名字 R.layout.XXX