ArrayAdapter的使用01

MainActivity.java

package com.example;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
//用ListView需引用ListView包
import android.widget.ArrayAdapter;
//用ArrayAdapter需引用ArrayAdapter包
import android.widget.ListView;

import android.os.Build;

public class MainActivity extends ActionBarActivity {

    private ListView listview;
    
    //定义一个String类型的数组来作为显示在ListView上的数据
    private String[] userlist = new String[]{"孙悟空","猪八戒","沙和尚"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        //获取UI上的listview组件
       listview = (ListView) findViewById(R.id.listview);
       
       //定义ArrayAdapter并添加三个参数
       ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,userlist);
       
       //listview绑定adapter
       listview.setAdapter(adapter);
       
       if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment())
                    .commit();
        }
    }

}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.MainActivity"
    tools:ignore="MergeRootFrame" 
    >
    
    <ListView 
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        
        />

</LinearLayout>