Android中ArrayAdapter的使用

Class Overview
By default this class expects that the provided resource id references a single TextView. If you want to use a more complex layout, use the constructors that also takes a field id. That field id should reference a TextView in the larger layout resource.

Constructor
ArrayAdapter(Context context, int resource)
Constructor
ArrayAdapter(Context context, int resource, int textViewResourceId)
Constructor
ArrayAdapter(Context context, int resource, T[] objects)
Constructor
ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects)
Constructor
ArrayAdapter(Context context, int resource, List<T> objects)
Constructor
ArrayAdapter(Context context, int resource, int textViewResourceId, List<T> objects)

第一种用法：
ListView listview = new ListView(this);  
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1);  
        adapter.add("string1");  
        adapter.add("haha");  
        adapter.add("heihei");        
        listview.setAdapter(adapter);  


第二种用法：
layout下的online_user_list_item.xml内容如下：
<?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="wrap_content">  
<TextView 
android:layout_width="wrap_content" 
android:layout_height="wrap_content"  
android:id="@+id/online_user_list_item_textview" android:text="TextView">
</TextView>  
<Button  
    android:text="button"  
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content">  
</Button>  
</LinearLayout>  

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.online_user_list_item, R.id.online_user_list_item_textview);  


第三种用法：
如果我们需要展示的内容是一仅一个textview承载不了的，我们可以自定义
public class UserListAdapter extends ArrayAdapter<User> {  
    private int resourceId;  
    public UserListAdapter(Context context, int textViewResourceId, List<User> objects) {  
        super(context, textViewResourceId, objects);  
        this.resourceId = textViewResourceId;  
    }  
      
    @Override  
    public View getView(int position, View convertView, ViewGroup parent){  
        User user = getItem(position);  
        LinearLayout userListItem = new LinearLayout(getContext());  
        String inflater = Context.LAYOUT_INFLATER_SERVICE;   
        LayoutInflater vi = (LayoutInflater)getContext().getSystemService(inflater);   
        vi.inflate(resourceId, userListItem, true);  
        TextView tvUsername = (TextView)userListItem.findViewById(R.id.tv_user_list_username);  
        TextView tvAskedNum = (TextView)userListItem.findViewById(R.id.tv_user_list_askednum);  
        TextView tvLastMsg = (TextView)userListItem.findViewById(R.id.tv_user_list_lastmsg);  
        tvUsername.setText(user.getUsername());  
        tvAskedNum.setText(String.valueOf(user.getAskedNum()));  
        tvLastMsg.setText(user.getLastMsg());  
        return userListItem;  
    }  
}