2014年7月21日凌晨笔记（转载）

标题：用LauncherActivity开发，启动Activity列表

注：与普通Activity的listView的区别是，单击列表项时，执行的结果是intent，即跳转到另一个对应的Activity中。

一、LauncherActivity的使用

LauncherActivity本质上是一个开发列表界面的Acticity，与普通的列表界面不同的是，它开发出来的列表界面的每个列表项对应于一个Intent，因此当用户点击不同的列表项时，应用程序会启动对应的Activity，需要注意的是继承LauncherActivity时通常应该重写intentForPosition（int position)方法，该方法根据不同的Item返回不同的Intent，从而程序自动启动不同的Activity。

OtherActivity继承LauncherActivity不需要界面布局文件。但通过SimpleAdapter来设置每个Item时需要用到布局文件list.xml：

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1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="match_parent"  
5.     android:orientation="horizontal"  
6.      >  
7.        
8.          <!-- 定义一个ImageView作为列表项的一部分 -->  
9.     <ImageView   
10.         android:id="@+id/header"  
11.         android:layout_height="wrap_content"  
12.         android:layout_width="wrap_content"  
13.         android:paddingLeft="10dp"     
14.         />  
15.     <TextView   
16.         android:id="@+id/name"  
17.         android:layout_height="match_parent"  
18.         android:layout_width="match_parent"  
19.         android:textSize="16dp"  
20.         android:gravity="center_vertical"  
21.         android:paddingLeft="10dp"  
22.         />  
23.       
24. </LinearLayout>  

<LinearLayout 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"
    android:orientation="horizontal"
     >
     
         <!-- 定义一个ImageView作为列表项的一部分 -->
	<ImageView 
		android:id="@+id/header"
		android:layout_height="wrap_content"
		android:layout_width="wrap_content"
		android:paddingLeft="10dp"   
	    />
	<TextView 
	    android:id="@+id/name"
	    android:layout_height="match_parent"
	    android:layout_width="match_parent"
	    android:textSize="16dp"
	    android:gravity="center_vertical"
	    android:paddingLeft="10dp"
	    />
    
</LinearLayout>

OtherActivity.java代码：

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1. package com.example.otheractivity;  
2.   
3. import java.util.ArrayList;  
4.   
5. public class OtherActivity extends LauncherActivity {  
6.       
7.     //定义两个Activity的名称   
8.     int []imageIds=new int[]{  
9.             R.drawable.ic_launcher,  
10.             R.drawable.ic_launcher  
11.     };  
12.     String[] ActivityNames={"设置程序参数","查看星际兵种"};  
13.     //定义两个Activity对应的实现类   
14.     Class<?>[] classes={ExpandableActivityTest.class,PreferenceActivityTest.class};  
15.     @Override  
16.     public void onCreate(Bundle savedInstanceState) {  
17.         super.onCreate(savedInstanceState);  
18.           
19.       //创建一个List集合，List集合的元素是Map     
20.         List<Map<String, Object>> listItems=new ArrayList<Map<String,Object>>();    
21.         for(int i=0;i<ActivityNames.length;i++){    
22.             Map<String, Object> listItem=new HashMap<String, Object>();    
23.             listItem.put("header", imageIds[i]);    
24.             listItem.put("personName", ActivityNames[i]);    
25.             listItems.add(listItem);    
26.         }   
27.         SimpleAdapter simpleAdapter=new SimpleAdapter(this, listItems, R.layout.list, new String[]{"personName","header"}, new int[]{R.id.name,R.id.header});  
28.         //设置该窗口现实的列表所需的Adapter   
29.         setListAdapter(simpleAdapter);  
30.     }  
31.   
32.     @Override  
33.     public boolean onCreateOptionsMenu(Menu menu) {  
34.         getMenuInflater().inflate(R.menu.activity_other, menu);  
35.         return true;  
36.     }  
37.     @Override  
38.     protected Intent intentForPosition(int position) {  
39.         // TODO Auto-generated method stub   
40.           
41.         return new Intent(OtherActivity.this, classes[position]);  
42.     }  
43.       
44.       
45. }  

我们先来看下面这张图片：

这张图片显示了Android提供的Activity类。

下面是程序清单：
Ex003_06Activity Java code

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1. public class ExpandableListActivityTest extends ExpandableListActivity {  
2.     public void onCreate(Bundle savedInstanceState) {  
3.         super.onCreate(savedInstanceState);  
4.         ExpandableListAdapter adapter = new BaseExpandableListAdapter() {  
5.             int[] logos = new int[] { R.drawable.p, R.drawable.z, R.drawable.t };  
6.             private String[] armTypes = new String[] { "神族兵种", "虫族兵种", "人族兵种" };  
7.             private String[][] arms = new String[][] {  
8.                     { "狂战士", "龙骑士", "黑暗圣堂", "电兵" },  
9.                     { "小狗", "刺蛇", "飞龙", "自爆飞机" }, { "机枪兵", "护士MM", "幽灵" } };  
10.   
11.             // 获取指定组位置、指定子列表项处的子列表项数据   
12.             @Override  
13.             public Object getChild(int groupPosition, int childPosition) {  
14.                 return arms[groupPosition][childPosition];  
15.             }  
16.   
17.             @Override  
18.             public long getChildId(int groupPosition, int childPosition) {  
19.                 return childPosition;  
20.             }  
21.   
22.             @Override  
23.             public int getChildrenCount(int groupPosition) {  
24.                 return arms[groupPosition].length;  
25.             }  
26.   
27.             private TextView getTextView() {  
28.                 AbsListView.LayoutParams lp = new AbsListView.LayoutParams(  
29.                         ViewGroup.LayoutParams.FILL_PARENT, 64);  
30.                 TextView textView = new TextView(  
31.                         ExpandableListActivityTest.this);  
32.                 textView.setLayoutParams(lp);  
33.                 textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);  
34.                 textView.setPadding(36, 0, 0, 0);  
35.                 textView.setTextSize(20);  
36.                 return textView;  
37.             }  
38.   
39.             // 该方法决定每个子选项的外观   
40.             @Override  
41.             public View getChildView(int groupPosition, int childPosition,  
42.                     boolean isLastChild, View convertView, ViewGroup parent) {  
43.                 TextView textView = getTextView();  
44.                 textView.setText(getChild(groupPosition, childPosition)  
45.                         .toString());  
46.                 return textView;  
47.             }  
48.   
49.             // 获取指定组位置处的组数据   
50.             @Override  
51.             public Object getGroup(int groupPosition) {  
52.                 return armTypes[groupPosition];  
53.             }  
54.   
55.             @Override  
56.             public int getGroupCount() {  
57.                 return armTypes.length;  
58.             }  
59.   
60.             @Override  
61.             public long getGroupId(int groupPosition) {  
62.                 return groupPosition;  
63.             }  
64.   
65.             // 该方法决定每个组选项的外观   
66.             @Override  
67.             public View getGroupView(int groupPosition, boolean isExpanded,  
68.                     View convertView, ViewGroup parent) {  
69.                 LinearLayout ll = new LinearLayout(  
70.                         ExpandableListActivityTest.this);  
71.                 ll.setOrientation(0);  
72.                 ImageView logo = new ImageView(ExpandableListActivityTest.this);  
73.                 logo.setImageResource(logos[groupPosition]);  
74.                 ll.addView(logo);  
75.                 TextView textView = getTextView();  
76.                 textView.setText(getGroup(groupPosition).toString());  
77.                 ll.addView(textView);  
78.                 return ll;  
79.             }  
80.   
81.             @Override  
82.             public boolean isChildSelectable(int groupPosition,  
83.                     int childPosition) {  
84.                 return true;  
85.             }  
86.   
87.             @Override  
88.             public boolean hasStableIds() {  
89.                 return true;  
90.             }  
91.         };  
92.         // 设置该窗口显示列表   
93.         setListAdapter(adapter);  
94.     }  
95. }  

public class ExpandableListActivityTest extends ExpandableListActivity {
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		ExpandableListAdapter adapter = new BaseExpandableListAdapter() {
			int[] logos = new int[] { R.drawable.p, R.drawable.z, R.drawable.t };
			private String[] armTypes = new String[] { "神族兵种", "虫族兵种", "人族兵种" };
			private String[][] arms = new String[][] {
					{ "狂战士", "龙骑士", "黑暗圣堂", "电兵" },
					{ "小狗", "刺蛇", "飞龙", "自爆飞机" }, { "机枪兵", "护士MM", "幽灵" } };

			// 获取指定组位置、指定子列表项处的子列表项数据
			@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.FILL_PARENT, 64);
				TextView textView = new TextView(
						ExpandableListActivityTest.this);
				textView.setLayoutParams(lp);
				textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
				textView.setPadding(36, 0, 0, 0);
				textView.setTextSize(20);
				return textView;
			}

			// 该方法决定每个子选项的外观
			@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;
			}

			// 获取指定组位置处的组数据
			@Override
			public Object getGroup(int groupPosition) {
				return armTypes[groupPosition];
			}

			@Override
			public int getGroupCount() {
				return armTypes.length;
			}

			@Override
			public long getGroupId(int groupPosition) {
				return groupPosition;
			}

			// 该方法决定每个组选项的外观
			@Override
			public View getGroupView(int groupPosition, boolean isExpanded,
					View convertView, ViewGroup parent) {
				LinearLayout ll = new LinearLayout(
						ExpandableListActivityTest.this);
				ll.setOrientation(0);
				ImageView logo = new ImageView(ExpandableListActivityTest.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;
			}
		};
		// 设置该窗口显示列表
		setListAdapter(adapter);
	}
}

ExpandableListActivityTest Java code

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1. public class ExpandableListActivityTest extends ExpandableListActivity {  
2.     public void onCreate(Bundle savedInstanceState) {  
3.         super.onCreate(savedInstanceState);  
4.         ExpandableListAdapter adapter = new BaseExpandableListAdapter() {  
5.             int[] logos = new int[] { R.drawable.p, R.drawable.z, R.drawable.t };  
6.             private String[] armTypes = new String[] { "神族兵种", "虫族兵种", "人族兵种" };  
7.             private String[][] arms = new String[][] {  
8.                     { "狂战士", "龙骑士", "黑暗圣堂", "电兵" },  
9.                     { "小狗", "刺蛇", "飞龙", "自爆飞机" }, { "机枪兵", "护士MM", "幽灵" } };  
10.   
11.             // 获取指定组位置、指定子列表项处的子列表项数据   
12.             @Override  
13.             public Object getChild(int groupPosition, int childPosition) {  
14.                 return arms[groupPosition][childPosition];  
15.             }  
16.   
17.             @Override  
18.             public long getChildId(int groupPosition, int childPosition) {  
19.                 return childPosition;  
20.             }  
21.   
22.             @Override  
23.             public int getChildrenCount(int groupPosition) {  
24.                 return arms[groupPosition].length;  
25.             }  
26.   
27.             private TextView getTextView() {  
28.                 AbsListView.LayoutParams lp = new AbsListView.LayoutParams(  
29.                         ViewGroup.LayoutParams.FILL_PARENT, 64);  
30.                 TextView textView = new TextView(  
31.                         ExpandableListActivityTest.this);  
32.                 textView.setLayoutParams(lp);  
33.                 textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);  
34.                 textView.setPadding(36, 0, 0, 0);  
35.                 textView.setTextSize(20);  
36.                 return textView;  
37.             }  
38.   
39.             // 该方法决定每个子选项的外观   
40.             @Override  
41.             public View getChildView(int groupPosition, int childPosition,  
42.                     boolean isLastChild, View convertView, ViewGroup parent) {  
43.                 TextView textView = getTextView();  
44.                 textView.setText(getChild(groupPosition, childPosition)  
45.                         .toString());  
46.                 return textView;  
47.             }  
48.   
49.             // 获取指定组位置处的组数据   
50.             @Override  
51.             public Object getGroup(int groupPosition) {  
52.                 return armTypes[groupPosition];  
53.             }  
54.   
55.             @Override  
56.             public int getGroupCount() {  
57.                 return armTypes.length;  
58.             }  
59.   
60.             @Override  
61.             public long getGroupId(int groupPosition) {  
62.                 return groupPosition;  
63.             }  
64.   
65.             // 该方法决定每个组选项的外观   
66.             @Override  
67.             public View getGroupView(int groupPosition, boolean isExpanded,  
68.                     View convertView, ViewGroup parent) {  
69.                 LinearLayout ll = new LinearLayout(  
70.                         ExpandableListActivityTest.this);  
71.                 ll.setOrientation(0);  
72.                 ImageView logo = new ImageView(ExpandableListActivityTest.this);  
73.                 logo.setImageResource(logos[groupPosition]);  
74.                 ll.addView(logo);  
75.                 TextView textView = getTextView();  
76.                 textView.setText(getGroup(groupPosition).toString());  
77.                 ll.addView(textView);  
78.                 return ll;  
79.             }  
80.   
81.             @Override  
82.             public boolean isChildSelectable(int groupPosition,  
83.                     int childPosition) {  
84.                 return true;  
85.             }  
86.   
87.             @Override  
88.             public boolean hasStableIds() {  
89.                 return true;  
90.             }  
91.         };  
92.         // 设置该窗口显示列表   
93.         setListAdapter(adapter);  
94.     }  
95. }  

public class ExpandableListActivityTest extends ExpandableListActivity {
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		ExpandableListAdapter adapter = new BaseExpandableListAdapter() {
			int[] logos = new int[] { R.drawable.p, R.drawable.z, R.drawable.t };
			private String[] armTypes = new String[] { "神族兵种", "虫族兵种", "人族兵种" };
			private String[][] arms = new String[][] {
					{ "狂战士", "龙骑士", "黑暗圣堂", "电兵" },
					{ "小狗", "刺蛇", "飞龙", "自爆飞机" }, { "机枪兵", "护士MM", "幽灵" } };

			// 获取指定组位置、指定子列表项处的子列表项数据
			@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.FILL_PARENT, 64);
				TextView textView = new TextView(
						ExpandableListActivityTest.this);
				textView.setLayoutParams(lp);
				textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
				textView.setPadding(36, 0, 0, 0);
				textView.setTextSize(20);
				return textView;
			}

			// 该方法决定每个子选项的外观
			@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;
			}

			// 获取指定组位置处的组数据
			@Override
			public Object getGroup(int groupPosition) {
				return armTypes[groupPosition];
			}

			@Override
			public int getGroupCount() {
				return armTypes.length;
			}

			@Override
			public long getGroupId(int groupPosition) {
				return groupPosition;
			}

			// 该方法决定每个组选项的外观
			@Override
			public View getGroupView(int groupPosition, boolean isExpanded,
					View convertView, ViewGroup parent) {
				LinearLayout ll = new LinearLayout(
						ExpandableListActivityTest.this);
				ll.setOrientation(0);
				ImageView logo = new ImageView(ExpandableListActivityTest.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;
			}
		};
		// 设置该窗口显示列表
		setListAdapter(adapter);
	}
}

PreferenceActivityTest Java code

[java] view plain copy print ?

1. public class PreferenceActivityTest extends PreferenceActivity  
2. {  
3.     @Override  
4.     public void onCreate(Bundle savedInstanceState)  
5.     {  
6.         super.onCreate(savedInstanceState);  
7.         // 设置显示参数设置布局。   
8.         addPreferencesFromResource(R.xml.preferences);  
9.     }  
10. }  

public class PreferenceActivityTest extends PreferenceActivity
{
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		// 设置显示参数设置布局。
		addPreferencesFromResource(R.xml.preferences);
	}
}

preferences.xml code

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >  
3.   
4.     <!-- 设置系统铃声 -->  
5.     <RingtonePreference  
6.         android:key="ring_key"  
7.         android:ringtoneType="all"  
8.         android:showDefault="true"  
9.         android:showSilent="true"  
10.         android:summary="选择铃声（测试RingtonePreference)"  
11.         android:title="设置铃声" >  
12.     </RingtonePreference>  
13.   
14.     <PreferenceCategory android:title="个人信息设置zu" >  
15.   
16.         <!-- 通过输入框填写用户名 -->  
17.         <EditTextPreference  
18.             android:dialogTitle="您所使用的用户名为："  
19.             android:key="name"  
20.             android:summary="填写您的用户名（测试EditTextPreference)"  
21.             android:title="填写用户名" />  
22.         <!-- 通过列表框选择性别 -->  
23.         <ListPreference  
24.             android:dialogTitle="ListPreference"  
25.             android:entries="@array/gender_name_list"  
26.             android:entryValues="@array/gender_value_list"  
27.             android:key="gender"  
28.             android:summary="选择您的性别（测试ListPreference）"  
29.             android:title="性别" />  
30.     </PreferenceCategory>  
31.     <PreferenceCategory android:title="系统功能设置组 " >  
32.         <CheckBoxPreference  
33.             android:defaultValue="true"  
34.             android:key="autoSave"  
35.             android:summaryOff="自动保存: 关闭"  
36.             android:summaryOn="自动保存: 开启"  
37.             android:title="自动保存进度" />  
38.     </PreferenceCategory>  
39.   
40. </PreferenceScreen>  

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

    <!-- 设置系统铃声 -->
    <RingtonePreference
        android:key="ring_key"
        android:ringtoneType="all"
        android:showDefault="true"
        android:showSilent="true"
        android:summary="选择铃声（测试RingtonePreference)"
        android:title="设置铃声" >
    </RingtonePreference>

    <PreferenceCategory android:title="个人信息设置zu" >

        <!-- 通过输入框填写用户名 -->
        <EditTextPreference
            android:dialogTitle="您所使用的用户名为："
            android:key="name"
            android:summary="填写您的用户名（测试EditTextPreference)"
            android:title="填写用户名" />
        <!-- 通过列表框选择性别 -->
        <ListPreference
            android:dialogTitle="ListPreference"
            android:entries="@array/gender_name_list"
            android:entryValues="@array/gender_value_list"
            android:key="gender"
            android:summary="选择您的性别（测试ListPreference）"
            android:title="性别" />
    </PreferenceCategory>
    <PreferenceCategory android:title="系统功能设置组 " >
        <CheckBoxPreference
            android:defaultValue="true"
            android:key="autoSave"
            android:summaryOff="自动保存: 关闭"
            android:summaryOn="自动保存: 开启"
            android:title="自动保存进度" />
    </PreferenceCategory>

</PreferenceScreen>

preferences.xml定义了一个参数设置界面
我们还需要在AndroidManifest.xml文件中设置下：

[java] view plain copy print ?

1. <!-- 定义两个Activity -->  
2.        <activity  
3.            android:name=".ExpandableListActivityTest"  
4.            android:label="查看星际兵种" >  
5.        </activity>  
6.        <activity  
7.            android:name=".PreferenceActivityTest"  
8.            android:label="设置程序参数" >  
9.        </activity>  

 <!-- 定义两个Activity -->
        <activity
            android:name=".ExpandableListActivityTest"
            android:label="查看星际兵种" >
        </activity>
        <activity
            android:name=".PreferenceActivityTest"
            android:label="设置程序参数" >
        </activity>

下面我们来看下程序运行后的结果：

点击设置参数后的界面是：

点击查看星际兵种的界面是：

本程序运行后将会在data/data/com.android.Ex003_06/shared_prefs/路径下生成一个/com.android.Ex003_06_preferences.xml文件。打开DDMS的File Explorer面板即可在里面找到