ArrayList的使用

<?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">
    <LinearLayout android:id="@+id/listLinearLayout"
        android:layout_width="fill_parent" android:layout_height="wrap_content"
        android:orientation="vertical">
        <ListView android:id="@id/android:list" android:layout_width="fill_parent"
            android:layout_height="wrap_content" android:drawSelectorOnTop="true"
            android:scrollbars="vertical" />
    </LinearLayout>
</LinearLayout>

<?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"
    android:orientation="horizontal" android:paddingLeft="10dip"
    android:paddingRight="10dip" android:paddingTop="1dip"
    android:paddingBottom="1dip">
    <TextView android:id="@+id/user_name" android:layout_width="180dip"
        android:layout_height="30dip" android:textSize="5pt"
        android:singleLine="true" />
    <TextView android:id="@+id/user_ip" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:gravity="right"
        android:textSize="5pt" />
</LinearLayout>

ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
        HashMap<String, String> map1 = new HashMap<String, String>();
        HashMap<String, String> map2 = new HashMap<String, String>();
        HashMap<String, String> map3 = new HashMap<String, String>();
        map1.put("user_name", "zhangsan");
        map1.put("user_ip", "192.168.0.1");
        map2.put("user_name", "zhangsan");
        map2.put("user_ip", "192.168.0.2");
        map3.put("user_name", "wangwu");
        map3.put("user_ip", "192.168.0.3");
        list.add(map1);
        list.add(map2);
        list.add(map3);
        MyAdapter listAdapter = new MyAdapter(this, list,
                R.layout.user, new String[] { "user_name", "user_ip" },
                new int[] { R.id.user_ip,R.id.user_name});
        setListAdapter(listAdapter);