Android列表显示（ListView）

package com.example.listview;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.annotation.SuppressLint;
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.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import android.os.Build;

public class MainActivity extends ActionBarActivity {

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

if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}

/**
* A placeholder fragment containing a simple view.
*/
@SuppressLint("ValidFragment")
public  class PlaceholderFragment extends Fragment {

@SuppressLint("ValidFragment")
public PlaceholderFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
//获取控件的ID
final ListView listview=(ListView)rootView.findViewById(R.id.listview);
//定义数组
final String[] name={"张三","李四","王五","刘刘"};
//创建一个ArrayAdapter
ArrayAdapter adapter=new ArrayAdapter(MainActivity.this,android.R.layout.simple_expandable_list_item_1,name);
listview.setAdapter(adapter);
//注册一个元素单击事件监听方法
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> arg0, View view,
int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, name[position], Toast.LENGTH_LONG).show();
}
});
return rootView;
}
}

}