疯狂android讲义第四章4.1节

/** * */ package org.crazyit.app; import android.app.ExpandableListActivity; import android.content.Intent; import android.os.Bundle; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ExpandableListView.OnChildClickListener; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; /** * Description: * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> * <br/>Copyright (C), 2001-2014, Yeeku.H.Lee * <br/>This program is protected by copyright laws. * <br/>Program Name: * <br/>Date: * @author Yeeku.H.Lee kongyeeku@163.com * @version 1.0 */ public class SelectCityActivity extends ExpandableListActivity { // 定义省份数组 private String[] provinces = new String[] { "广东", "广西", "湖南"}; private String[][] cities = new String[][] { { "广州", "深圳", "珠海", "中山" }, { "桂林", "柳州", "南宁", "北海" }, { "长沙", "岳阳" , "衡阳" , "株洲" } }; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ExpandableListAdapter adapter = new BaseExpandableListAdapter() { // 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 cities[groupPosition][childPosition]; } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public int getChildrenCount(int groupPosition) { return cities[groupPosition].length; } private TextView getTextView() { AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, 64); TextView textView = new TextView(SelectCityActivity.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 provinces[groupPosition]; } @Override public int getGroupCount() { return provinces.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(SelectCityActivity.this); ll.setOrientation(0); ImageView logo = new ImageView(SelectCityActivity.this); 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); getExpandableListView().setOnChildClickListener( new OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View source, int groupPosition, int childPosition, long id) { // 获取启动该Activity之前的Activity对应的Intent Intent intent = getIntent(); intent.putExtra("city", cities[groupPosition][childPosition]); // 设置该SelectActivity的结果码，并设置结束之后退回的Activity SelectCityActivity.this.setResult(0, intent); // 结束SelectCityActivity。 SelectCityActivity.this.finish(); return false; } }); } }