用LauncherActivity开发启动Activity列表

最新推荐文章于 2018-03-21 11:11:27 发布

Jasonzhou613

最新推荐文章于 2018-03-21 11:11:27 发布

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分类专栏： android之深入Activity 文章标签： android string object class java encoding

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本文介绍了一款Android应用中的参数设置界面与扩展列表活动的实现方式。通过PreferenceActivity及自定义ExpandableListActivity，展示了如何创建个性化的设置界面及多层级的数据列表。程序能够生成配置文件，并提供丰富的交互体验。

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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

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

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

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

<?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：

 <!-- 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：