18_ListView实现分组效果

简单实现ListView分组的效果

1.实现效果如下：

2.数据库准备数据

package com.example.contactdemo.db;import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;public class ContactSQLiteOpenHelper extends SQLiteOpenHelper {private static String name = "contact.db";private static Integer version = 1;public ContactSQLiteOpenHelper(Context context) {super(context, name, null, version);}@Overridepublic void onCreate(SQLiteDatabase db) {// 创建数据库表db.execSQL("create table user(_id integer primary key autoincrement,name varchar(50),phone varchar(12),sortkey varchar(10))");}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}
}

3.创建实体Bean

package com.example.contactdemo.domain;public class User {private Integer id;private String name;private String phone;private String sortKey;public User() {super();// TODO Auto-generated constructor stub}public User(Integer id, String name, String phone, String sortKey) {super();this.id = id;this.name = name;this.phone = phone;this.sortKey = sortKey;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}public String getSortKey() {return sortKey;}public void setSortKey(String sortKey) {this.sortKey = sortKey;}@Overridepublic String toString() {return "User [id=" + id + ", name=" + name + ", phone=" + phone+ ", sortKey=" + sortKey + "]";}}

4.创建Dao实现数据插入及查询

package com.example.contactdemo.dao;import java.util.List;import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;import com.example.contactdemo.db.ContactSQLiteOpenHelper;
import com.example.contactdemo.domain.User;public class UserDao {private ContactSQLiteOpenHelper helper;private List<User> data;private SQLiteDatabase db;public UserDao(Context context,List<User> data) {this.data=data;helper = new ContactSQLiteOpenHelper(context);}public void insert(User u){//获取SQLiteDatabase对象db = helper.getWritableDatabase();db.execSQL("insert into user(name,phone,sortkey) values(?,?,?)", new Object[]{u.getName(),u.getPhone(),u.getSortKey()});db.close();}/*** 针对listView分组的情况*/public void getObjectHeader(){db = helper.getWritableDatabase();//查询出分组的数据  Cursor c = db.rawQuery("select distinct(sortkey) from user order by sortkey", null);//遍历分组while (c.moveToNext()) {//具体的某个组String sortKey = c.getString(c.getColumnIndex("sortkey"));User usort = new User();usort.setSortKey(sortKey);    data.add(usort);//查询这个组对应数据Cursor c2 = db.rawQuery("select _id,name,phone,sortkey from user where  sortkey=?", new String[]{sortKey});//遍历数据while(c2.moveToNext()){User user = new User();user.setId(c2.getInt(c2.getColumnIndex("_id")));user.setName(c2.getString(c2.getColumnIndex("name")));user.setPhone(c2.getString(c2.getColumnIndex("phone")));user.setSortKey(c2.getString(c2.getColumnIndex("sortkey")));data.add(user);}c2.close();}c.close();db.close();}}

5 测试类插入数据及查询数据

package com.example.contactdemo.test;import java.util.ArrayList;
import java.util.List;import android.test.AndroidTestCase;import com.example.contactdemo.dao.UserDao;
import com.example.contactdemo.domain.User;public class UserTest extends AndroidTestCase {private UserDao userDao;private List<User> data = new ArrayList<User>();   public void testInsert() {userDao = new UserDao(getContext(), null);User u1 = new User(null, "陈红军", "15631293227", "c");User u2 = new User(null, "李军", "15631293227", "l");User u3 = new User(null, "红军", "15631293227", "h");User u4 = new User(null, "军军", "15631293227", "j");User u5 = new User(null, "红军", "15631293227", "h");User u6 = new User(null, "陈红军", "15631293227", "c");User u7 = new User(null, "汪红军", "15631293227", "w");User u8 = new User(null, "八戒", "15631293227", "b");User u9 = new User(null, "哈哈四", "15631293227", "h");User u10 = new User(null, "陈红军", "15631293227", "c");userDao.insert(u1);userDao.insert(u2);userDao.insert(u3);userDao.insert(u4);userDao.insert(u5);userDao.insert(u6);userDao.insert(u7);userDao.insert(u8);userDao.insert(u9);userDao.insert(u10);}public void testGetObjectHeader() {userDao = new UserDao(getContext(), data);userDao.getObjectHeader();for(User u:data){if(u.getId()==null){System.out.println("分组的key@@@@@"+u.getSortKey());}else{System.out.println("分组key对应的数据@"+u);}}}
}

6.adapter的实现

package com.example.contactdemo.adapter;import java.util.List;import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;import com.example.contactdemo.R;
import com.example.contactdemo.domain.User;public class UserAdapter extends BaseAdapter {private List<User> data;private Context context;public UserAdapter(Context context, List<User> data) {this.context = context;this.data = data;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn data.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn data.get(position);}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view = convertView;User u = data.get(position);// 根据标签类型加载不通的布局模板if (u.getId() == null) {// 如果是标签项view = View.inflate(context, R.layout.group_list_item_header, null);} else {// 否则就是数据项了view = View.inflate(context, R.layout.group_list_item, null);}// 显示名称TextView textView = (TextView) view.findViewById(R.id.group_list_item_text);if (u.getId() == null) {textView.setText(u.getSortKey());} else {textView.setText(u.getName());}// 返回重写的viewreturn view;}public boolean isEnabled(int position) {User u = data.get(position);if (u.getId() == null) {return false;}return super.isEnabled(position);}}

7.Activity的实现

package com.example.contactdemo;import java.util.ArrayList;
import java.util.List;import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;import com.example.contactdemo.adapter.UserAdapter;
import com.example.contactdemo.dao.UserDao;
import com.example.contactdemo.domain.User;public class MainActivity extends Activity {//声明listView控件对象private ListView lv_users;//数据库操作对象private UserDao userDao;//显示的数据private List<User> data = new ArrayList<User>();//适配器对象private UserAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//获取listView控件对象lv_users = (ListView) findViewById(R.id.lv_users);//创建数据库操作对象userDao = new UserDao(this, data);//查询数据userDao.getObjectHeader();//创建适配器对象adapter = new UserAdapter(this, data);//设置控件的适配器lv_users.setAdapter(adapter);}
}

7.需要的布局文件

7.1 activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="${relativePackage}.${activityClass}" ><ListView android:id="@+id/lv_users"android:layout_width="match_parent"android:layout_height="match_parent"/></RelativeLayout>

7.2 group_list_item_header.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/group_header"android:background="#555555"android:paddingLeft="10dip" ><TextViewandroid:id="@+id/group_list_item_text"android:layout_width="wrap_content"android:layout_height="20dip"android:gravity="center_vertical"android:textColor="#ffffff" /></LinearLayout>

7.3 group_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"android:id="@+id/group_content"android:padding="8dip" ><!-- 图片和文字 --><ImageViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:contentDescription="@string/hello_world"android:src="@drawable/ic_launcher" /><TextViewandroid:id="@+id/group_list_item_text"android:layout_width="wrap_content"android:layout_height="match_parent"android:gravity="center_vertical"android:paddingLeft="5dip"/></LinearLayout>

8.项目清单文件AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.contactdemo"android:versionCode="1"android:versionName="1.0" ><uses-sdkandroid:minSdkVersion="8"android:targetSdkVersion="19" /><instrumentationandroid:name="android.test.InstrumentationTestRunner"android:targetPackage="com.example.contactdemo" /><applicationandroid:allowBackup="true"android:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><activityandroid:name=".MainActivity"android:label="@string/app_name" ><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><uses-library android:name="android.test.runner" /></application></manifest>

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