[控件]ExpandableListActivity

mainActivity.java

import java.util.ArrayList;import java.util.List;import android.app.ExpandableListActivity;import android.os.Bundle;import android.widget.ExpandableListView;public class mainActivity extends ExpandableListActivity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        List<String> gl = new ArrayList<String>();        List<List<String>> cl = new ArrayList<List<String>>();        gl.add("gr1");        gl.add("gr2");        gl.add("gr3");        List<String> chil1 = new ArrayList<String>();        chil1.add("c11");        chil1.add("c12");        chil1.add("c13");        chil1.add("c14");        chil1.add("c15");        chil1.add("c16");        chil1.add("c17");        chil1.add("c18");        List<String> chil2 = new ArrayList<String>();        chil2.add("c21");        chil2.add("c22");        chil2.add("c23");        chil2.add("c24");        chil2.add("c25");        chil2.add("c26");        chil2.add("c27");        chil2.add("c28");        List<String> chil3 = new ArrayList<String>();        chil3.add("c31");        chil3.add("c32");        chil3.add("c33");        chil3.add("c34");        chil3.add("c35");        chil3.add("c36");        chil3.add("c37");        chil3.add("c38");        cl.add(chil1);        cl.add(chil2);        cl.add(chil3);        adapter e = new adapter(this, gl, cl);        ExpandableListView expandableListView = getExpandableListView();        // 设置适配器        expandableListView.setAdapter(e);        // 设置组图标 可以使用selector        expandableListView.setGroupIndicator(getResources().getDrawable(                R.drawable.away));        // 设置组图标位置        expandableListView.setIndicatorBounds(0, 40);        // 设置子项图标        expandableListView.setChildIndicator(getResources().getDrawable(                R.drawable.busy));        // 设置子项图标位置        expandableListView.setChildIndicatorBounds(0, 40);    }}

adapter.java

import java.util.ArrayList;import java.util.List;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseExpandableListAdapter;import android.widget.TextView;/** * @version 2012-8-27 上午10:36:36 **/public class adapter extends BaseExpandableListAdapter {    List<String> GroupList = new ArrayList<String>();    List<List<String>> ChildrenList = new ArrayList<List<String>>();    Context context = null;    public adapter(Context c, List<String> gl, List<List<String>> cl) {        context = c;        GroupList.addAll(gl);        ChildrenList.addAll(cl);    }    // 返回组的总数    @Override    public int getGroupCount() {        return GroupList.size();    }    // 返回子项总数    @Override    public int getChildrenCount(int groupPosition) {        return ChildrenList.get(groupPosition).size();    }    // 返回组对象    @Override    public Object getGroup(int groupPosition) {        return GroupList.get(groupPosition);    }    // 返回子项对象    @Override    public Object getChild(int groupPosition, int childPosition) {        return ChildrenList.get(groupPosition).get(childPosition);    }    // 返回组ID    @Override    public long getGroupId(int groupPosition) {        return groupPosition;    }    // 返回子项ID    @Override    public long getChildId(int groupPosition, int childPosition) {        return childPosition;    }    // 是否具有固定ID    @Override    public boolean hasStableIds() {        return false;    }    // 返回组VIEW    @Override    public View getGroupView(int groupPosition, boolean isExpanded,            View convertView, ViewGroup parent) {        TextView tv = new TextView(context);        tv.setText(GroupList.get(groupPosition));        tv.setHeight(40);        return tv;    }    // 返回子项VIEW    @Override    public View getChildView(int groupPosition, int childPosition,            boolean isLastChild, View convertView, ViewGroup parent) {        TextView tv = new TextView(context);        tv.setText(ChildrenList.get(groupPosition).get(groupPosition));        tv.setHeight(40);        return tv;    }    // 子项是否可以被选中    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        return true;    }}

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><ExpandableListViewandroid:id="@id/android:list"android:layout_width="fill_parent"android:layout_height="wrap_content"></ExpandableListView></LinearLayout>