在listview中使用包含更多视图的数组适配器

Question

我偶然发现了一个我无法理解的问题,所以我希望也许有人遇到同样的问题,或者知道解决问题的好方法.

我创建了一个包含ListView的视图.这个ListView包含两个TextView.问题是我不知道在哪里使用ArrayAdapter发送第二个文本视图中的值.有没有办法向ArrayAdapter发送更多信息,以便我可以提供"todaysmenu"TextView？

ArrayAdapter方法:

private void createList() {
    ListView lv = (ListView) findViewById(R.id.mylist);
    String[] values = new String[] { "Android", "Linux", "OSX", 
            "WebOS", "Windows7", "Ubuntu", "OS/2"
    };
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.rowlayout, R.id.restaurantname, values);
    lv.setAdapter(adapter);
}

行标记:

<?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"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/restaurantname"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@+id/restaurantname"
        android:textSize="23dp" >

    </TextView>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@+id/todaysmenu" />

</LinearLayout>

活动布局:

<?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="vertical" >

    <ListView
    android:id="@+id/mylist"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    </ListView>


</LinearLayout>

一开始我把一切都搞定了,但是当我添加第二个文本域问题时.提前谢谢你的帮助!

Answer 1

为此,您必须构建自定义适配器并为自定义行布局充气.使用ArrayAdapter将无法正常工作,因为

默认情况下,此类期望提供的资源ID引用单个TextView.如果要使用更复杂的布局,请使用也带有字段ID的构造函数.该字段id应引用较大布局资源中的TextView.

所以,你的自定义适配器类可能是这样的:

public class CustomAdapter extends ArrayAdapter {
    private final Activity activity;
    private final List list;

    public CustomAdapter(Activity activity, ArrayList<Restaurants> list) {
        this.activity = activity;
        this.list = list;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View rowView = convertView;
        ViewHolder view;

        if(rowView == null)
        {
            // Get a new instance of the row layout view
            LayoutInflater inflater = activity.getLayoutInflater();
            rowView = inflater.inflate(R.layout.rowlayout, null);

            // Hold the view objects in an object, that way the don't need to be "re-  finded"
            view = new ViewHolder();
            view.retaurant_name= (TextView) rowView.findViewById(R.id.restaurantname);
            view.restaurant_address= (TextView) rowView.findViewById(R.id.textView1);

            rowView.setTag(view);
        } else {
            view = (ViewHolder) rowView.getTag();
        }

        /** Set data to your Views. */
        Restaurants item = list.get(position);
        view.retaurant_name.setText(item.getTickerSymbol());
        view.restaurant_address.setText(item.getQuote().toString());

        return rowView;
    }

    protected static class ViewHolder{
        protected TextView retaurant_name;
        protected TextView restaurant_address;
    }
}

你的Restaurant.java类可以像我在下面描述的那样简单:

public class Restaurants {
    private String name;
    private String address;

    public Restaurants(String name, String address) {
        this.name = name;
        this.address = address;
    }
    public void setName(String name) {
        this.name= name;
    }
    public String getName() {
        return name;
    }
    public void setAddress(String address) {
        this.address= address;
    }
    public String getAddress() {
        return address;
    }
}

现在,在你的主要活动中,只需用一些数据绑定你的列表,比如;

/** Declare and initialize list of Restaurants. */
ArrayList<Restaurants> list = new ArrayList<Restaurants>();

/** Add some restaurants to the list. */
list.add(new Restaurant("name1", "address1"));
list.add(new Restaurant("name2", "address2"));
list.add(new Restaurant("name3", "address3"));
list.add(new Restaurant("name4", "address4"));
list.add(new Restaurant("name5", "address5"));
list.add(new Restaurant("name6", "address6"));

此时,您可以将自定义适配器设置为列表

ListView lv = (ListView) findViewById(R.id.mylist);

CustomAdapter adapter = new CustomAdapter(YourMainActivityName.this, list);
lv.setAdapter(adapter);

这就是全部,它应该工作得很好,但我强烈建议你谷歌一些更好的替代方案来实现其他适配器.