android ListView使用
1.DbOpenHelper
package dbOpenHelper; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; /** * Created by Administrator on 2014/8/25. */ public class DbOpenHelper extends SQLiteOpenHelper { public DbOpenHelper(Context context) { //Context 上下文 //name 数据库名 //CursorFactory 游标工厂模式 当为null时 使用默认值 //version 数据库版本 版本号从1开始 super(context, "person.db", null, 1); } @Override public void onCreate(SQLiteDatabase db) { //create table person(id integer primary key autoincrement,name varchar(20),age int,phone varchar(11)) String sql = "create table person(id integer primary key autoincrement,name varchar(20),int age,phone varchar(11))"; db.execSQL(sql); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } }
2.entity
package domain; /** * Created by Administrator on 2014/8/25. */ public class Person { private int id; private String name; private int age; private String phone; public Person(){} public Person(int id, String name, int age, String phone) { this.id = id; this.name = name; this.age = age; this.phone = phone; } public Person(int id, String name, String phone) { this.id = id; this.name = name; this.phone = phone; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } @Override public String toString() { return "个人信息{" + "id=" + id + ", name=‘" + name + ‘\‘‘ + ", age=" + age + ", phone=‘" + phone + ‘\‘‘ + ‘}‘; } }
3.DAO
package dao; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import dbOpenHelper.DbOpenHelper; import domain.Person; import java.util.ArrayList; import java.util.List; /** * Created by Administrator on 2014/8/25. */ public class PersonDao { private DbOpenHelper helper; public PersonDao(Context context) { helper = new DbOpenHelper(context); } public void add(Person p) { SQLiteDatabase db = helper.getWritableDatabase(); String sql = "insert into person(name,phone) values(?,?)"; db.execSQL(sql,new Object[]{p.getName(),p.getPhone()}); db.close(); } public void update(Person p) { SQLiteDatabase db = helper.getWritableDatabase(); String sql = "update person set phone=? where name=?"; db.execSQL(sql,new Object[]{p.getPhone(),p.getName()}); db.close(); } public void delete(String name) { SQLiteDatabase db = helper.getWritableDatabase(); String sql = "delete from person where name=?"; db.execSQL(sql,new Object[]{name}); db.close(); } public Person findByName(String name) { SQLiteDatabase db = helper.getWritableDatabase(); String sql = "select * from person where name=?"; Cursor cursor = db.rawQuery(sql,new String[]{name}); Person p = null; while(cursor.moveToFirst()) { int id = cursor.getInt(cursor.getColumnIndex("id")); String phone = cursor.getString(cursor.getColumnIndex("phone")); p = new Person(id,name,phone); } db.close(); return p; } public List<Person> findAll() { SQLiteDatabase db = helper.getWritableDatabase(); String sql = "select * from person"; Cursor cursor = db.rawQuery(sql,null); List<Person> list = new ArrayList<Person>(); while(cursor.moveToNext()) { int id = cursor.getInt(cursor.getColumnIndex("id")); String name = cursor.getString(cursor.getColumnIndex("name")); String phone = cursor.getString(cursor.getColumnIndex("phone")); Person p = new Person(id,name,phone); list.add(p); } db.close(); return list; } }
4.item.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="120dp" android:layout_height="wrap_content" android:text="@string/id" android:id="@+id/tv_id" /> <TextView android:layout_width="120dp" android:layout_height="wrap_content" android:text="@string/name" android:id="@+id/tv_name" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/phone" android:id="@+id/tv_phone" /> </LinearLayout>
5.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"> <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <TextView android:layout_width="120dp" android:layout_height="wrap_content" android:text="@string/id" /> <TextView android:layout_width="120dp" android:layout_height="wrap_content" android:text="@string/name" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/phone" /> </LinearLayout> <ListView android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/list" /> </LinearLayout>
6.mainActivity.java
package com.example.dbTest; import android.app.Activity; import android.database.Cursor; import android.os.Bundle; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.SimpleCursorAdapter; import dao.PersonDao; import domain.Person; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** * Created by Administrator on 2014/8/25. */ public class PersonListActivity extends Activity { private PersonDao dao; private ListView lv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.listview); lv = (ListView)this.findViewById(R.id.list); dao = new PersonDao(this); show(); } private void show() { List<Person> persons = dao.findAll(); List<HashMap<String,Object>>data = new ArrayList<HashMap<String,Object>>(); for (Person p:persons) { HashMap<String,Object> item = new HashMap<String,Object>(); item.put("id",p.getId()); item.put("name",p.getName()); item.put("phone",p.getPhone()); data.add(item); } SimpleAdapter sa = new SimpleAdapter(this,data,R.layout.item,new String[]{"id","name","phone"},new int[]{R.id.tv_id,R.id.tv_name,R.id.tv_phone}); lv.setAdapter(sa); } }
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