Windows Phone 7 可以把它看成是Android 的 ListView ,WP7 只是预先在XAML里面为它的数据模板规定了格式,而Android 可以通过后期引入数据的方式为其添加数据模板。
Android 我们可以通过以下几种方式为LISTVIEW 添加数据,用法极其简单:
继承ListActivity,使用SetListAdapter,参考下面的代码。 setListAdapter( new ArrayAdapter < String > ( this , android.R.layout.simple_list_item_1, mStrings));可自定义数据源,继承BaseAdapter ,参考下面代码。 自定义数据源 private class SlowAdapter extends BaseAdapter { private LayoutInflater mInflater; public SlowAdapter(Context context) { mContext = context; mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } /* * * The number of items in the list is determined by the number of speeches * in our array. * * @see android.widget.ListAdapter#getCount() */ public int getCount() { return mStrings.length; } /* * * Since the data comes from an array, just returning the index is * sufficent to get at the data. If we were using a more complex data * structure, we would return whatever object represents one row in the * list. * * @see android.widget.ListAdapter#getItem(int) */ public Object getItem( int position) { return position; } /* * * Use the array index as a unique id. * * @see android.widget.ListAdapter#getItemId(int) */ public long getItemId( int position) { return position; } /* * * Make a view to hold each row. * * @see android.widget.ListAdapter#getView(int, android.view.View, * android.view.ViewGroup) */ public View getView( int position, View convertView, ViewGroup parent) { TextView text; if (convertView == null ) { text = (TextView)mInflater.inflate(android.R.layout.simple_list_item_1, parent, false ); } else { text = (TextView)convertView; } if ( ! mBusy) { text.setText(mStrings[position]); // Null tag means the view has the correct data text.setTag( null ); } else { text.setText( " Loading... " ); // Non-null tag means the view still needs to load it's data text.setTag( this ); } return text; } /* * * Remember our context so we can use it when constructing views. */ private Context mContext; }
由于Android 默认提供了多种自定义数据源的格式模板给我们,所以用起来非常方便有多种可供选择:SimpleAdapter,SimpleCursorAdapter,ArrayAdapter<?>等,具体可在具体的项目上实施使用。
本篇将着重介绍WP7 的ListBox 一个我自认为非常简单方便的数据绑定方法。并且通过Silverlight 特有的数据绑定方法在XAML绑定数据。本篇学习笔记将以一个呈现天气列表的LISTBOX的例,效果如下:
实现这个功能我们需要编写一个Model 己记录这些实体信息,Model代码如下:
public class weather { public string Conditions { get ; set ; } public string ImageUrl { get ; set ; } public string Low { get ; set ; } public string High { get ; set ; } public string Location { get ; set ; } public weather( string conditins, string imageurl, string low, string high, string location) { this .Conditions = conditins; this .ImageUrl = imageurl; this .Low = low; this .High = high; this .Location = location; } }
并且我们还需要一个类来做为ListBox 的数据源,前篇有讲过数据绑定的一篇文章提到过ObservableCollection 不知道大家还有没有印象,本篇就是使用这个数据集合来做ListBox 数据源,该类代码如下:
public class weathers:List < weather > { private const string imageUrl = " ../images/ " ; public weathers() { BuildCollection(); } public ObservableCollection < weather > DataCollection { get ; set ; } public ObservableCollection < weather > BuildCollection() { DataCollection = new ObservableCollection < weather > (); DataCollection.Add( new weather( " 阴天 " , imageUrl + " 19n.png " , " 10度 " , " 20度 " , " 广州 " )); DataCollection.Add( new weather( " 凉爽 " , imageUrl + " 23d.png " , " 20度 " , " 25度 " , " 海南 " )); DataCollection.Add( new weather( " 多云 " , imageUrl + " 26n.png " , " 10度 " , " 18度 " , " 深圳 " )); DataCollection.Add( new weather( " 晴转多云 " , imageUrl + " 27d.png " , " 20度 " , " 23度 " , " 三亚 " )); DataCollection.Add( new weather( " 阴转多云 " , imageUrl + " 27n.png " , " 22度 " , " 23度 " , " 揭阳 " )); DataCollection.Add( new weather( " 晴天 " , imageUrl + " 31d.png " , " 22度 " , " 25度 " , " 汕头 " )); return DataCollection; } }
实体类和数据源代码编写完成后,接下来打开mainPage.xaml,添加一个命名空间:
xmlns:data = " clr-namespace:ListBoxDatBind "
Tip:这里指定的是你的数据源所在的命名空间。
之后,添加一个页面的资源KEY
< phone:PhoneApplicationPage.Resources > < data:weathers x:Key = " weatherCollection " /> </ phone:PhoneApplicationPage.Resources >
准备工作准备完成,为ListBox 绑定数据:
< ListBox Name = " listBox1 " ItemsSource = " {Binding Source={StaticResource weatherCollection},Path=DataCollection} " > < ListBox.ItemTemplate > < DataTemplate > < StackPanel Orientation = " Horizontal " > < Image Source = " {Binding Path=ImageUrl} " /> < StackPanel Orientation = " Vertical " > < TextBlock Text = " {Binding Conditions} " /> < TextBlock Text = " {Binding Low} " /> < TextBlock Text = " {Binding High} " /> < TextBlock Text = " {Binding Location} " /> </ StackPanel > </ StackPanel > </ DataTemplate > </ ListBox.ItemTemplate > </ ListBox >
运行的效果如上图。
个人觉得,要论数据绑定的话,还是Android 的 ListView 来得灵活一点,不过Wp 7 的数据绑定却在微软的封装下来得方便许多。
源码下载:
数据绑定