Android入门之ExpandableListView控件的实施
发布时间:2021-11-25 17:12:35 所属栏目:PHP教程 来源:互联网
导读:本文通过学习ExpandableListView控件的使用,同时学习ExpandableListActivity类和SimpleExpandableListAdapter适配器的使用。 通过例子讲解,代码中有详细的注释: 首先layout中有3个布局文件: main.xml ?xml version=1.0 encoding=utf-8? LinearLayout xml
本文通过学习ExpandableListView控件的使用,同时学习ExpandableListActivity类和SimpleExpandableListAdapter适配器的使用。 通过例子讲解,代码中有详细的注释: 首先layout中有3个布局文件: 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/android:list" android:layout_width="fill_parent" android:layout_height="fill_parent" android:drawSelectorOnTop="true" /><!-- android:drawSelectorOnTop:是否高亮显示 --> <TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="no data" android:id="@id/android:empty" /> </LinearLayout> --------------------------------------------------------------------------- group.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" > <TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="no data" android:id="@+id/tvgroup" android:paddingBottom="10px" android:paddingLeft="50px" /> </LinearLayout> -------------------------------------------------- child.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" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="no data" android:id="@+id/tvchild" android:paddingLeft="50px" /> </LinearLayout> --------------------------------------------------------------------- java代码: import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.ExpandableListActivity; import android.os.Bundle; import android.widget.SimpleExpandableListAdapter; public class ExpandableListActivityTest extends ExpandableListActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); List<Map<String, String>> groups = new ArrayList<Map<String, String>>(); Map<String, String> group1 = new HashMap<String, String>(); group1.put("group", "huangweiyong"); Map<String, String> group2 = new HashMap<String, String>(); group2.put("group", "xiaoqi"); Map<String, String> group3 = new HashMap<String, String>(); group3.put("group", "hahaha"); groups.add(group1); groups.add(group2); groups.add(group3); List<Map<String, String>> child1 = new ArrayList<Map<String, String>>(); Map<String, String> child1Data1 = new HashMap<String, String>(); child1Data1.put("child", "child1Data1"); Map<String,String> child1Data2 = new HashMap<String,String>(); child1Data2.put("child", "child1Data2"); child1.add(child1Data1); child1.add(child1Data2); List<Map<String, String>> child2 = new ArrayList<Map<String, String>>(); Map<String, String> child2Data1 = new HashMap<String, String>(); child2Data1.put("child", "child1Data1"); child2.add(child2Data1); List<Map<String, String>> child3 = new ArrayList<Map<String, String>>(); Map<String, String> child3Data1 = new HashMap<String, String>(); child3Data1.put("child", "child1Data1"); child3.add(child3Data1); List<List<Map<String, String>>> childs = new ArrayList<List<Map<String, String>>>(); childs.add(child1); childs.add(child2); childs.add(child3); /** * 生成一个SimpleExpandableListAdapter对象 * 1、context * 2、一级条目的数据 * 3、用来设置一级条目样式的布局文件 * 4、指定一级条目数据的key * 5、指定一级条目数据显示的控件id * 6、指定二级条目的数据 * 7、用来设置二级条目样式的布局文件 * 8、指定二级条目数据的key * 9、指定二级条目数据显示的控件id */ SimpleExpandableListAdapter sela = new SimpleExpandableListAdapter( this, groups, R.layout.group, new String[] { "group" }, new int[] { R.id.tvgroup }, childs, R.layout.child, new String[] { "child" }, new int[] { R.id.tvchild }); //将适配器对象设置给ExpandableListActivity setListAdapter(sela); } } ![]() (编辑:应用网_丽江站长网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |