android之ExpandableListActivity
MainActivity.java
package com.example.mars_2300_expandablelist; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.app.ExpandableListActivity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.SimpleExpandableListAdapter; import android.os.Build; public class MainActivity extends ExpandableListActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 定义一个List,该List对象为一级条目提供数据 List<Map<String, String>> groups = new ArrayList<Map<String, String>>(); Map<String, String> group1 = new HashMap<String, String>(); group1.put("group", "group1"); Map<String, String> group2 = new HashMap<String, String>(); group2.put("group", "group2"); groups.add(group1); groups.add(group2); // 定义一个List,该List对象为第一个一级条目提供二级条目的数据 List<Map<String, String>> child1 = new ArrayList<Map<String, String>>(); Map<String, String> child1Data1 = new HashMap<String, String>(); child1Data1.put("child", "child1Data1"); child1.add(child1Data1); Map<String, String> child1Data2 = new HashMap<String, String>(); child1Data2.put("child", "child1Data2"); child1.add(child1Data2); // 定义一个List,该List对象为第二个一级条目提供二级条目的数据 List<Map<String, String>> child2 = new ArrayList<Map<String, String>>(); Map<String, String> child2Data = new HashMap<String, String>(); child2Data.put("child", "child2Data"); child2.add(child2Data); // 定义一个List,该List对象用来存储所有的二级条目的数据 List<List<Map<String, String>>> childs = new ArrayList<List<Map<String, String>>>(); childs.add(child1); childs.add(child2); // 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控件的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控件的id SimpleExpandableListAdapter sela = new SimpleExpandableListAdapter( this, groups, R.layout.group, new String[] { "group" }, new int[] { R.id.groupTo }, childs, R.layout.child, new String[] { "child" }, new int[] { R.id.childTo }); // 将SimpleExpandableListAdapter对象设置给当前的ExpandableListActivity setListAdapter(sela); } }
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" > <ExpandableListView android:id="@id/android:list" android:layout_width="fill_parent" android:layout_height="fill_parent" android:drawSelectorOnTop="false"/> <TextView android:id="@id/android:empty" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="No data"/> </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:id="@+id/childTo" android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingLeft="50px" android:paddingTop="5px" android:paddingBottom="5px" android:textSize="20sp" android:text="No data" /> </LinearLayout>
activity_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="false"/> <TextView android:id="@id/android:empty" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="No data"/> </LinearLayout>