Android界面编程之五 第四组UI组件：AdapterView及其子类

AdapterView本身是一个抽象基类，它派生的子类在用法上十分相似，只是显示界面有一定区别

AdapterView继承了ViewGroup

AdapterView可以包括多个“列表项”

AdapterView显示的多个“列表项”由Adapter提供调用AdapterView的setAdapter(Adapter)方法设置Adapter

AdapterView派生了三个子类：AbsListView、AbsSpinner和AdapterViewAnimator，这三个依旧是抽象类

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2.5.1 列表视图ListView和 ListActivity

手机系统中广泛采用了ListView

可以通过以下两种方式创建ListView：

1.直接使用ListView进行创建

2.让Activity继承ListActivity

AbsListView提供了如下XML属性：

android:choiceMode		设置AbsListView的选择行为： none singleChoice multipleChoice multipleChoiceMode
android:drawSelectorOnTop		若设为true，选中列表项将会显示在上面
android:fastScrollEnabled		是否允许快速滚动
android:listSelector		指定被选中的列表项上绘制的Drawable
android:scrollingCache		是否使用绘制缓存
android:stackFromBottom		是否从底端开始排列列表项
android:smoothScrollbar		若设为false，则不在header View之后绘制分隔条
android:textFilterEnabled		是否对列表项进行过滤。当AbsListView对应的Adapter实现了Filter接口时才会起作用
android:transcriptMode		滚动模式： disable normal alwaysScroll

ListView 提供了如下XML属性：

android:divider	分隔条（颜色、Drawable）
android:dividerHeight
android:entries	数组资源
android:footerDividerEnabled	若为false，则不在footer View之前绘制分隔条
android:headerDividerEnabled	若为false，则不在header View之前绘制分隔条

示例代码：（需要添加arrays.xml）

< ListView
        android:layout_width = "match_parent"
        android:layout_height = "wrap_content"
        android:entries = "@array/books"
        android:divider = "#f00"
        android:dividerHeight = "2px"
        android:headerDividersEnabled = "false"

    />

使用ListView能定制的内容很少，甚至每个列表项的字号大小、颜色都不能改变。

如果想改变这些特性，就需要把ListView作为AdapterView使用

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2.5.2 Adapter接口及实现类

Adapter本身只是一个接口，它派生了ListAdapter和SpinnerAdapter两个子接口，其中ListAdapter为AbsListView提供列表项，而SpinnerAdapter为AbsSpinner提供列表项

ArrayAdapter：简单易用的Adapter，通常用于将数组或List集合的多个值包装成列表项

SimpleAdapter：将List集合的多个对象包装成多个列表项

SimpleCursorAdapter：包装Cursor提供的数据

BaseAdapter：通常用于被扩展，可以对各列表项提供最大限度的定制

ArrayAdapter 示例程序的代码：

@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout. activity_main );
ListView list1 = (ListView) findViewById(R.id. list1 );
String[] arr1 = { "悟空" , "八戒" , "悟能" };
ArrayAdapter<String> adapter1 = new ArrayAdapter<String>( this ,
R.layout. array_item , arr1);
list1.setAdapter(adapter1);

ListView list2 = (ListView) findViewById(R.id. list2 );
String[] arr2 = { "曹操" , "孙权" , "刘备" };
ArrayAdapter<String> adapter2 = new ArrayAdapter<String>( this ,
R.layout. checked_item , arr2);
list2.setAdapter(adapter2);

}

array_item.xml，checked_item.xml两个文件控制列表项组件的外观

checked_item.xml代码如下：

< CheckedTextView xmlns:android = "http://schemas.android.com/apk/res/android"

    android:id="@+id/TextView"

    android:layout_width = "match_parent"
    android:layout_height = "wrap_content"
    android:textSize = "14dp"
    android:padding = "20px"
    android:shadowDx = "4"
    android:shadowDy = "4"
    android:shadowColor = "#0f0"

    android:shadowRadius="2"

    android:checkMark="@drawable/ok"

    />

基于ListActivity实现列表——当程序窗口仅需显示一个列表，则可以直接让Activity继承ListActivity来实现，ListActivity的子类无须调用setContentView()方法来显示某个界面，而可以直接传入一个内容Adapter，ListActivity的子类就呈现出一个列表

Java实现代码如下：（onCreate部分内容）

String[] arr = { "悟空" , "八戒" , "悟能" };
ArrayAdapter<String> adapter = new ArrayAdapter<String>( this ,
R.layout. simple_list_item_multiple_choice , arr);

setListAdapter(adapter);

simple_list_tem…………该xml文件代码类似上例中的checked_item.xml

使用SimpleAdapter创建ListView

通过ArrayAdapter实现Adapter虽然简单、易用，但ArrayAdapter的功能有限。它的每个列表项只能是TextView。如果开发者需要实现更复杂的列表项，则可以考虑使用SimpleAdapter（实际上SimpleAdapter使用并不简单）

oops 陷阱

Drawable文件下的图片资源文件名不能含大写字母

SimpleAdapter simpleAdapter = new SimpleAdapter( this , listItems,
        R.layout.simple_item,
        new String[]{ "personName" , "header" , "desc" },

        new int[]{R.id.name, R.id.header, R.id.desc});

上面这句代码创建了一个SimpleAdapter，使用SimpleAdapter最大的难点在于创建SimpleAdapter对象，它需要5个参数，后面4个参数十分关键：

param2：该参数应该是一个List<? extends Map<String, ?>>类型的集合对象，该集合中每个Map<String,?>对象生成一个列表项

param3：指定一个界面布局的ID

param4：应为一个String[]类型的参数，该参数决定提取Map<String, ?>对象中那些key对应的value来生成的列表项

param5：int[]，决定填充哪些组件

示例代码：

public class MainActivity extends ActionBarActivity {

private String[] names = new String[]
{ "Libai" , "Dupu" , "Liqingzhao" };
private String[] descs = new String[]
{ "Lovely boy" , "A girl good at piano" ,
"Romantic poet" };
private int [] imageIds = new int []
{R.drawable. libai ,R.drawable. dupu ,R.drawable. liqingzhao };
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        setContentView(R.layout. activity_main );
        List<Map<String, Object>> listItems =
        new ArrayList<Map<String, Object>>();
        for ( int i = 0; i < names . length ; i++)
        {
        Map<String, Object> listItem = new HashMap<String, Object>();
        listItem.put( "header" , imageIds [i]);
        listItem.put( "personName" , names [i]);
        listItem.put( "desc" , descs [i]);
        listItems.add(listItem);
        }
        SimpleAdapter simpleAdapter = new SimpleAdapter( this , listItems,
        R.layout. simple_item ,
        new String[]{ "personName" , "header" , "desc" },
        new int []{R.id. name , R.id. header , R.id. desc });
        ListView list = (ListView) findViewById(R.id. mylist );
        list.setAdapter(simpleAdapter);

    }

}

xml文件代码：

< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    android:orientation = "horizontal"
    android:layout_width = "match_parent"
    android:layout_height = "wrap_content"
     >
< ImageView
    android:id = "@+id/header"
    android:layout_width = "wrap_content"
    android:layout_height = "wrap_content"
    android:paddingLeft = "10dp"
    />
< LinearLayout
    android:orientation = "vertical"
    android:layout_width = "match_parent"
    android:layout_height = "wrap_content"
    >
< TextView
    android:id = "@+id/name"
    android:layout_width = "wrap_content"
    android:layout_height = "wrap_content"
    android:textSize = "20dp"
    android:textColor = "#f0f"
    android:paddingLeft = "10dp"
/>
< TextView
    android:id = "@+id/desc"
    android:layout_width = "wrap_content"
    android:layout_height = "wrap_content"
    android:textSize = "14dp"
    android:paddingLeft = "10dp"
    />
</ LinearLayout >

</ LinearLayout >

        

SimpleAdapter同样可以作为ListActivity的内容Adapter，这样可以让用户方便地定制ListActivity所显示的列表

如果需要监听用户单击、选中某个列表项的事件，可以通过AdapterView的setOnItemClickListener()方法为单击事件添加监听器，或通过setOnItemSelectedListener()方法为列表项选中事件添加监听器。

添加方法如下：

        list.setOnItemClickListener( new OnItemClickListener()
        {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id)
        {
        System. out .println( names [position] + "was clicked" );
        }
        });
       
        list.setOnItemSelectedListener( new OnItemSelectedListener()
        {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
        {
        System. out .println( names [position] + "was selected" );
        }
        @Override
        public void onNothingSelected(AdapterView<?> parent)
        {
       
        }

        });

下面扩展BaseAdapter实现不存储列表项的ListView

扩展BaseAdapter可以取得对Adapter最大的控制权

示例程序代码：

public class MainActivity extends ActionBarActivity {

ListView myList ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        setContentView(R.layout. activity_main );
        myList = (ListView) findViewById(R.id. myList );
        BaseAdapter adapter = new BaseAdapter()
        {
        @Override
        public int getCount()
        {
        return 40;
        }
        @Override
        public Object getItem( int position)
        {
        return null ;
        }
        @Override
        public long getItemId( int position)
        {
        return position;
        }
        @Override
        public View getView( int position
        , View convertView, ViewGroup parent)
        {
        LinearLayout line = new LinearLayout(MainActivity. this );
        line.setOrientation(0);
        ImageView image = new ImageView(MainActivity. this );
        image.setImageResource(R.drawable. ic_launcher );
        TextView text = new TextView(MainActivity. this );
        text.setText( "第" + (position + 1) + "个列表项" );
        text.setTextSize(20);
        text.setTextColor(Color. RED );
        line.addView(image);
        line.addView(text);
       
        return line;
        }
        };

        myList.setAdapter(adapter);

    }

}

上述代码中重写了Adapter的如下4个方法：

getCount():返回值控制列表项数量

getItem(int position)：返回值决定第position处列表项内容

getItemId(int position)：返回值决定第position处列表项的ID

getView(int position, View convertView, ViewGroup parent)：返回值决定第position处的列表项组件

利用Adapter步骤：

1.用四种方式之一创建Adapter

2.调用AdapterView的setAdapter(Adapter)方法设置Adapter

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2.5.3 AutoCompleteTextView 自动完成文本框的功能和用法

AutoCompleteTextView从EditText派生而出，实际比文本编辑框多一个功能：当用户输入一定字符后，自动完成文本框会显示一个下拉菜单，供用户从中选择

AutoCompleteTextView除了可使用EditText提供的XML属性和方法之外，还支持如下XML属性：

android:completionHint		设置下拉菜单中的提示标题
android:completionHintView		设置下拉菜单中提示标题的试图
android:completionThreshold		设置用户至少输入几个字符才会显示提示
android:dropDownAnchor		设置下拉菜单的定位“锚点”组件，如果没有指定该属性，将使用该TextView本身作为定位“锚点”组件
android:dropDownHeight		设置下拉菜单的高度
android:dropDownVerticalOffset		设置下拉菜单与文本框之间的垂直偏移，默认紧跟
android:dropDownWidth		设置下拉菜单宽度
android:popupBackground		设置下拉菜单的背景

使用AutoCompleteTextView很简单，只要为它设置一个Adapter，该Adapter封装了AutoCompleteTextView预设的提示文本；其还派生了一个子类：MultiAutoCompleteTextView，该子类允许输入多个提示项，多个提示项以分隔符分隔，另有setTokenizer()方法设置分隔符

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2.5.4 GridView 网格试图的功能和用法

GridView用于在界面上按行、列分布的方式来显示多个组件。GridView与ListView有共同的AbsListView，GridView与ListView的唯一区别在于：ListView只显示一列，而GridView可以显示多列；GridView也需要Adapter来提供显示的数据，开发者可以采用上面介绍的4种方式中的一种来创建Adapter，GridView与ListView的用法基本一致，GridView提供了如下XML属性：

android:columnWidth	设置列宽度
android:gravity	设置对齐方式
android:horizontalSpacing	设置各元素之间的水平间距
android:numColumns	设置列数
android:stretchMode	设置拉伸模式 NO_STRETCH 不拉伸 STRETCH_SPACING 仅拉伸元素之间的间距 STRETCH_SPACING_UNIFORM 表格元素本身、元素之间的间距一起拉伸 STRETCH_COLUMN_WIDTH 仅元素表格本身
android:verticalSpacing	设置各元素之间的垂直间距

示例代码：

public class MainActivity extends ActionBarActivity {

GridView grid ;
ImageView imageView ;
int [] imageIds = new int [] { R.drawable. bomb5 , R.drawable. bomb6 ,
R.drawable. bomb7 , R.drawable. bomb8 , R.drawable. bomb9 ,
R.drawable. bomb10 , R.drawable. bomb11 , R.drawable. bomb12 ,
R.drawable. bomb13 , R.drawable. bomb14 , R.drawable. bomb15 ,
R.drawable. bomb16 , };

@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout. activity_main );
List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();
for ( int i = 0; i < imageIds . length ; i++) {
Map<String, Object> listItem = new HashMap<String, Object>();
listItem.put( "image" , imageIds [i]);
listItems.add(listItem);
}
imageView = (ImageView) findViewById(R.id. imageView );
SimpleAdapter simpleAdapter = new SimpleAdapter( this , listItems,
R.layout. cell , new String[] { "image" },
new int [] { R.id. image1 });
grid = (GridView) findViewById(R.id. grid01 );
grid .setAdapter(simpleAdapter);
grid .setOnItemSelectedListener( new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
imageView .setImageResource( imageIds [position]);
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
grid .setOnItemClickListener( new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
imageView .setImageResource( imageIds [position]);
}

});

}

}

xml代码：cell.xml

<? xml version = "1.0" encoding = "UTF-8" ?>
< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:orientation = "horizontal"
android:layout_width = "fill_parent"
android:layout_height = "fill_parent"
android:gravity = "center_horizontal"
android:padding = "2pt"
>
< ImageView
android:id = "@+id/image1"
android:layout_width = "50dp"
android:layout_height = "50dp"
/>

</ LinearLayout >

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2.5.5 可展开的列表组件 ExpandableListView

ExpandableListView是ListView子类，它在普通ListView的基础上进行了扩展，它把应用中的列表项分为几组，每组可包含多个列表项

其所显示的列表项应该由ExpandableListAdapter提供。实现ExpandableListAdapter有如下三种方式：

1.扩展BaseExpandableListAdapter实现ExpandableListAdapter

2.使用SimpleExpandableListAdapter将两个List集合包装成ExpandableListAdapter

3.使用SimpleCursorTreeAdapter将Cursor中的数据包装成SimpleCursor-TreeAdapter

ExpandableListView所额外支持的常用xml属性有：

android:childDivider	指定各组内列表项之间的分隔条
android:childIndicator	显示在子列表旁边的Drawable对象
android:groupIndicator	显示在组列表项旁边的Drawable对象

示例代码：main.xml

<? 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"
>
< ExpandableListView
android:id = "@+id/list"
android:layout_width = "fill_parent"
android:layout_height = "wrap_content"
android:childIndicator = "@drawable/ic_launcher"
/>

</ LinearLayout >

Java程序代码：

public class MainActivity extends ActionBarActivity {

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        setContentView(R.layout. activity_main );
        ExpandableListAdapter adapter = new BaseExpandableListAdapter()
        {
        int [] logos = new int []
        {
        R.drawable. p ,
        R.drawable. z ,
        R.drawable. t
        };
        private String[] armTypes = new String[]
        { "GodArmy" , "IncideArmy" , "HumanArmy" };
        private String[][] arms = new String[][]
        {
        { "Yeal" , "Dragon" , "Flyer" },
        { "Pets" , "Ants" },
        { "Nurse" , "Sodiler" }
        };
        @Override
        public Object getChild( int groupPosition, int childPosition)
        {
        return arms [groupPosition][childPosition];
        }
        @Override
        public long getChildId( int groupPosition, int childPosition)
        {
        return childPosition;
        }
        @Override
        public int getChildrenCount( int groupPosition)
        {
        return arms [groupPosition]. length ;
        }
        private TextView getTextView()
        {
        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
        ViewGroup.LayoutParams. MATCH_PARENT , 64);
        TextView textView = new TextView(MainActivity. this );
        textView.setLayoutParams(lp);
        textView.setGravity(Gravity. CENTER_VERTICAL |Gravity. LEFT );
        textView.setPadding(36, 0, 0, 0);
        textView.setTextSize(20);
        return textView;
        }
        @Override
        public View getChildView( int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent)
        {
        TextView textView = getTextView();
        textView.setText(getChild(groupPosition,childPosition).toString());  
        return textView;
        }
        @Override
        public Object getGroup( int groupPosition)
        {
        return armTypes [groupPosition];
        }
        @Override
        public int getGroupCount()
        {
        return armTypes . length ;
        }
        @Override
        public long getGroupId( int groupPosition)
        {
        return groupPosition;
        }
        @Override
        public View getGroupView( int groupPosition,
        boolean isExpanded, View convertView, ViewGroup parent)
        {
        LinearLayout ll = new LinearLayout(MainActivity. this );
        ll.setOrientation(0);
        ImageView logo = new ImageView(MainActivity. this );
        logo.setImageResource( logos [groupPosition]);
        ll.addView(logo);
        TextView textView = getTextView();
        textView.setText(getGroup(groupPosition).toString());  
        ll.addView(textView);
        return ll;
        }
        @Override
        public boolean isChildSelectable( int groupPosition,
        int childPosition)
        {
        return true ;
        }
        @Override
        public boolean hasStableIds()
        {
        return true ;
        }
       
        };
        ExpandableListView expandListView = (ExpandableListView) findViewById(R.id. list );
        expandListView.setAdapter(adapter);

    }

}

扩展BaseExpandableListAdapter时，关键是实现如下4个方法：

getGroupCount()

getGroupView()

getChildrenCount()

getChildView()

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2.5.6 Spinner的功能与用法

Spinner就是一个列表选择框，二十弹出一个菜单供用户选择

Spinner与Gallery都继承了AbsSpinner，AbsSpinner继承了AdapterView，因此它也表现出AdapterView的特征：只要为AdapterView提供Adapter即可

Spinner支持的常用XML属性如下：

android:entries		使用数组资源设置该下拉列表框的列表项目
android:dropDownHorizontalOffset		设置下拉列表框的水平偏移距离
android:dropDownVerticalOffset		设置下拉列表框的垂直偏移距离
android:dropDownWidth		设置下拉列表框的宽度
android:popupBackground		设置下拉列表框的背景色
android:prompt		设置该列表选择框的提示信息

android:entries属性并不是Spinner定义的，后面介绍的Gallery也支持该xml属性

oops

arrays.xml(注意s)在main.xml中的引用方法是（示例）：

        android:entries="@array/books"

另外，string-array无大写

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2.5.7 Gallery的功能与用法

Gallery & Spinner有共同的父类：AbsSpinner，Gallery & Spinner都是一个列表框，区别在于：

1.Gallery显示的是一个垂直的列表框

2.Spinner供用户选择，而Gallery则允许用户通过拖动来查看上一个、下一个列表项

Gallery额外提供了如下的XML属性：

android:animationDuration		设置图片切换时的动画持续时间
android:gravity		设置对齐方式
android:spacing		设置图片之间的间距
android:unselectedAlpha		设置没有选中的图片的透明度

Gallery本身的用法非常简单——基本与Spinner用法相似，只要为它提供一个内容Adapter即可，该Adapter的getView方法所返回的View将作为Gallery的列表项；可通过为Gallery添加OnItemSelectedListener监听器即可实现

Android已经不再推荐使用Gallery组件，而是推荐使用其他水平滚动组件如HorizontalScrollView和ViewPager来代替Gallery组件

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2.5.8 AdapterViewFlipper的功能与用法

AdapterViewFlipper继承了AdapterViewAnimator，它也会显示Adapter提供的多个组件，但它每次只能显示一个，程序通过showPrevious()和showNext()方法控制该组件显示上一个、下一个组件

AdapterViewFlipper可以在多个View切换过程中使用渐隐渐显的动画效果，还可以调用startFlipping()控制它自动播放下一个View组件

可指定的XML属性有：

android:animateFirstView	设置显示该组件的第一个View时是否使用动画
android:inAnimation	设置该组件显示时使用的动画
android:loopViews	设置循环到最后一个组件后是否自动“转头”到第一个组件
android:outAnimation	设置隐藏时使用的动画
android:autoStart
android:flipInterval	自动播放时间间隔

示例代码如下：

xml

< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    xmlns:tools = "http://schemas.android.com/tools"
    android:layout_width = "match_parent"
    android:layout_height = "match_parent"
    >
    < AdapterViewFlipper
        android:id = "@+id/flipper"
        android:layout_width = "match_parent"
        android:layout_height = "wrap_content"
        android:flipInterval = "1000"
        android:layout_alignParentTop = "true"
        ></ AdapterViewFlipper >
    < Button
        android:layout_width = "wrap_content"
        android:layout_height = "wrap_content"
        android:layout_alignParentBottom = "true"
        android:layout_alignParentLeft = "true"
        android:onClick = "prev"
        android:text = "previous one"
        />
    < Button
        android:layout_width = "wrap_content"
        android:layout_height = "wrap_content"
        android:layout_alignParentBottom = "true"
android:layout_centerHorizontal = "true"
        android:onClick = "next"
        android:text = "next one"
        />
    < Button
        android:layout_width = "wrap_content"
        android:layout_height = "wrap_content"
        android:layout_alignParentBottom = "true"
        android:layout_alignParentRight = "true"
        android:onClick = "auto"
        android:text = "play gallery"
        />

</ RelativeLayout >

Java代码

public class MainActivity extends ActionBarActivity {

int [] imageIds = new int [] { R.drawable. shuangzi , R.drawable. shuangyu ,
R.drawable. chunv , R.drawable. tiancheng , R.drawable. tianxie ,
R.drawable. sheshou , R.drawable. juxie , R.drawable. shuiping ,
R.drawable. shizi , R.drawable. baiyang , R.drawable. jinniu ,
R.drawable. mojie };
AdapterViewFlipper flipper ;

@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout. activity_main );
flipper = (AdapterViewFlipper) findViewById(R.id. flipper );
BaseAdapter adapter = new BaseAdapter(){
@Override
public int getCount()
{
return imageIds . length ;
}

@Override
public Object getItem( int position)
{
return position;
}

@Override
public long getItemId( int position)
{
return position;
}

//
@Override
public View getView( int position, View convertView, ViewGroup parent)
{
//
ImageView imageView = new ImageView(MainActivity. this );
imageView.setImageResource( imageIds [position]);
//
imageView.setScaleType(ImageView.ScaleType. FIT_XY );
//
imageView.setLayoutParams( new LayoutParams(
LayoutParams. MATCH_PARENT , LayoutParams. MATCH_PARENT
));
return imageView;
}
};
flipper .setAdapter(adapter);
}
public void prev(View source)
{
flipper .showPrevious();
flipper .stopFlipping();
}
public void next(View source)
{
flipper .showNext();
flipper .stopFlipping();

}
public void auto(View source)
{
flipper .startFlipping();

}

}

---

2.5.9 StackView的功能与用法

StackView也是AdapterViewAnimator的子类，它也用于显示Adapter提供的系列View。以堆叠方式显示多个列表项

提供了如下两种控制方式：

1.拖走StackView中处于顶端的View，下一个View将会显示出来。

2.通过调用StackView的showNext()、showPrevious()控制显示上一个、下一个组件

示例代码：

public class MainActivity extends ActionBarActivity {

StackView stackView ;
int [] imageIds = new int [] { R.drawable. shuangzi , R.drawable. shuangyu ,
R.drawable. chunv , R.drawable. tiancheng , R.drawable. tianxie ,
R.drawable. sheshou , R.drawable. juxie , R.drawable. shuiping ,
R.drawable. shizi , R.drawable. baiyang , R.drawable. jinniu ,
R.drawable. mojie };

@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout. activity_main );
stackView = (StackView) findViewById(R.id. mStackView );
List<Map<String, Object>> listItems =
new ArrayList<Map<String, Object>>();
for ( int i = 0; i < imageIds . length ; i++)
{
Map<String, Object> listItem = new HashMap<String, Object>();
listItem.put( "image" , imageIds [i]);
listItems.add(listItem);
}

SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems,

R.layout.cell, new String[]{"image"},new int[]{R.id.image1});

stackView .setAdapter(simpleAdapter);
}
public void prev(View view)
{
stackView .showPrevious();
}
public void next(View source)
{
stackView .showNext();

}

}

xml代码：

main.xml

< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    xmlns:tools = "http://schemas.android.com/tools"
    android:layout_width = "match_parent"
    android:layout_height = "match_parent"
    >
    < AdapterViewFlipper
        android:id = "@+id/flipper"
        android:layout_width = "match_parent"
        android:layout_height = "wrap_content"
        android:flipInterval = "1000"
        android:layout_alignParentTop = "true"
        ></ AdapterViewFlipper >
    < Button
        android:layout_width = "wrap_content"
        android:layout_height = "wrap_content"
        android:layout_alignParentBottom = "true"
        android:layout_alignParentLeft = "true"
        android:onClick = "prev"
        android:text = "previous one"
        />
    < Button
        android:layout_width = "wrap_content"
        android:layout_height = "wrap_content"
        android:layout_alignParentBottom = "true"
android:layout_centerHorizontal = "true"
        android:onClick = "next"
        android:text = "next one"
        />
    < Button
        android:layout_width = "wrap_content"
        android:layout_height = "wrap_content"
        android:layout_alignParentBottom = "true"
        android:layout_alignParentRight = "true"
        android:onClick = "auto"
        android:text = "play gallery"
        />

</ RelativeLayout >

cell.xml

<? xml version = "1.0" encoding = "UTF-8" ?>
< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:orientation = "horizontal"
android:layout_width = "fill_parent"
android:layout_height = "fill_parent"
android:gravity = "center_horizontal"
android:padding = "2pt"
>
< ImageView
android:id = "@+id/image1"
android:layout_width = "120dp"
android:layout_height = "120dp"
/>

</ LinearLayout >