欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  移动技术

Android操作SQLite数据库(增、删、改、查、分页等)及ListView显示数据的方法详解

程序员文章站 2024-02-21 19:40:46
本文实例讲述了android操作sqlite数据库(增、删、改、查、分页等)及listview显示数据的方法。分享给大家供大家参考,具体如下: 由于刚接触android开...

本文实例讲述了android操作sqlite数据库(增、删、改、查、分页等)及listview显示数据的方法。分享给大家供大家参考,具体如下:

由于刚接触android开发,故此想把学到的基础知识记录一下,以备查询,故此写的比较啰嗦:

步骤如下:

一、介绍:

此文主要是介绍怎么使用android自带的数据库sqlite,以及把后台的数据用listview控件显示

二、新建一个android工程——dbsqliteoperate

工程目录:

Android操作SQLite数据库(增、删、改、查、分页等)及ListView显示数据的方法详解

三、清单列表androidmanifest.xml的配置为:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.example.dboperate"
  android:versioncode="1"
  android:versionname="1.0" >
  <uses-sdk android:minsdkversion="8" />
  <application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <!--单元测试 加这句-->
    <uses-library android:name="android.test.runner" />
    <activity
      android:name=".dbsqliteoperateactivity"
      android:label="@string/app_name" >
      <intent-filter>
        <action android:name="android.intent.action.main" />
        <category android:name="android.intent.category.launcher" />
      </intent-filter>
    </activity>
  </application>
 <instrumentation android:name="android.test.instrumentationtestrunner"
 android:targetpackage="com.example.dboperate"
 android:label="test for my app"/>
</manifest>

四、main.xml配置清单:

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" >
  <linearlayout android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal" >
  <textview
    android:id="@+id/name"
    android:layout_width="100dip"
    android:layout_height="wrap_content"
    android:text="@string/name"
    android:gravity="center"/>
  <textview
    android:id="@+id/phone"
    android:layout_width="100dip"
    android:layout_height="wrap_content"
    android:text="@string/phone"
    android:gravity="center"/>
  <textview
    android:id="@+id/amount"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/amount"
    android:gravity="center"/>
</linearlayout>
  <listview
    android:id="@+id/listview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
  </listview>
</linearlayout>

五、item.xml配置清单:

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="horizontal" >
  <textview
    android:id="@+id/name"
    android:layout_width="100dip"
    android:layout_height="wrap_content"
    android:text="@string/name"
    android:gravity="center"/>
  <textview
    android:id="@+id/phone"
    android:layout_width="100dip"
    android:layout_height="wrap_content"
    android:text="@string/phone"
    android:gravity="center"/>
  <textview
    android:id="@+id/amount"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/amount"
    android:gravity="center"/>
</linearlayout>

六、string.xml配置清单:

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="hello">hello world, dbsqliteoperateactivity!</string>
  <string name="app_name">exampledbsqliteoperate8</string>
  <string name="name">姓名</string>
  <string name="phone">电话</string>
  <string name="amount">存款</string>
</resources>

七、dbsqliteoperateactivity.java activity类的源码:

package com.example.dboperate;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import com.example.adapter.personadapter;
import com.example.domain.person;
import com.example.service.personservice;
import android.app.activity;
import android.database.cursor;
import android.os.bundle;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.adapterview;
import android.widget.adapterview.onitemclicklistener;
import android.widget.listview;
import android.widget.simpleadapter;
import android.widget.simplecursoradapter;
import android.widget.toast;
public class dbsqliteoperateactivity extends activity {
 listview listview;
 personservice personservice;
 onitemclicklistener listviewlistener;
  /** called when the activity is first created. */
  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.main);
    listviewlistener = new onitemclicklistener(){
  @override
  public void onitemclick(adapterview<?> parent, view view, int position, long id) {
  //得到listview控件
  listview listview = (listview)parent;
  //1、如果使用自定义适配器,返回的是person对象
  //得到该条目数据
//  person person = (person)listview.getitematposition(position);
//  //广播出去
//  toast.maketext(getapplicationcontext(), person.tostring(), toast.length_long).show();
  //2、如果使用showlist2()方法中的适配器时,则取得的值是不一样的,返回的是cursor
//  cursor cursor = (cursor)listview.getitematposition(position);
//  int personid = cursor.getint(cursor.getcolumnindex("_id"));
//  toast.maketext(getapplicationcontext(), personid+"", toast.length_long).show();
  //3、如果使用showlist()方法中的适配器时,则取得的值是不一样的,返回的是map
  @suppresswarnings("unchecked")
  map<string,object> map = (map)listview.getitematposition(position);
  string name = map.get("name").tostring();
  string personid = map.get("personid").tostring();
  toast.maketext(getapplicationcontext(), personid +"-"+ name, toast.length_long).show();
  }
    };
    listview = (listview) this.findviewbyid(r.id.listview);
    listview.setonitemclicklistener(listviewlistener);
    personservice = new personservice(this);
    showlist();
  }
 private void showlist() {
 list<person> persons = personservice.getscrolldata(0, 50);
 list<hashmap<string,object>> data = new arraylist<hashmap<string,object>>();
 for(person person : persons){
  hashmap<string,object> item = new hashmap<string,object>();
  item.put("name", person.getname());
  item.put("phone", person.getphone());
  item.put("amount", person.getamount());
  item.put("personid", person.getid());
  data.add(item);
 }
 simpleadapter adapter = new simpleadapter(this,data,r.layout.item, new string[]{"name","phone","amount"}, new int[]{r.id.name,r.id.phone,r.id.amount});
   listview.setadapter(adapter);
 }
 public void showlist2(){
 cursor cursor = personservice.getcursorscrolldata(0, 50);
 //该适配器要求返回的结果集cursor必须包含_id字段,所以需要对取得结果集进行处理
 simplecursoradapter adapter = new simplecursoradapter(this,r.layout.item,cursor,new string[]{"name","phone","amount"}, new int[]{r.id.name,r.id.phone,r.id.amount} );
 listview.setadapter(adapter);
 }
 /**
 * 自定义适配器
 */
 public void showlist3(){
 list<person> persons = personservice.getscrolldata(0, 50);
 /**
  * 第一个参数:上下文context,第二个参数:要显示的数据,第三个参数:绑定的条目界面
  */
 personadapter adapter = new personadapter(this, persons, r.layout.item);
 listview.setadapter(adapter);
 }
}

八、person.java 实体类 源码:

package com.example.domain;
public class person {
 private integer id;
 private string name;
 private string phone;
 private integer amount;
 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 person(string name, string phone) {
 this.name = name;
 this.phone = phone;
 }
 public person(integer id, string name, string phone,integer amount) {
 super();
 this.id = id;
 this.name = name;
 this.phone = phone;
 this.amount = amount;
 }
 public person() {
 super();
 }
 public integer getamount() {
 return amount;
 }
 public void setamount(integer amount) {
 this.amount = amount;
 }
 @override
 public string tostring() {
 return "person [id=" + id + ", name=" + name + ", phone=" + phone
  + ", amount=" + amount + "]";
 }
}

九、dboperatehelper.java 业务类源码:

package com.example.service;
import android.content.context;
import android.database.sqlite.sqlitedatabase;
import android.database.sqlite.sqlitedatabase.cursorfactory;
import android.database.sqlite.sqliteopenhelper;
public class dboperatehelper extends sqliteopenhelper {
 public dboperatehelper(context context) {//默认创建的数据库文件保存在<包名>/database/
 //第一个参数是上下文,第二个参数是数据库名称,第三个是游标工厂为null时使用 数据库默认的游标工厂,第四个是数据库版本号但是不能为0,一般大于0
 super(context, "smallpig", null, 4);
 }
 /**
 * 数据库每一次被创建时被调用
 */
 @override
 public void oncreate(sqlitedatabase sqldb) {
 sqldb.execsql("create table person(personid integer primary key autoincrement,name varchar(20),phone varchar(12) null)");
 }
  /**
   * 每一次数据库版本号发生变动时触发此方法
   * 比如如果想往数据库中再插入一些表、字段或者其他信息时通过修改数据库版本号来触发此方法
   */
 @override
 public void onupgrade(sqlitedatabase db, int oldversion, int newversion) {
 //db.execsql("alter table person add phone varchar(12) null");\
 db.execsql("alter table person add amount integer null");
 }
}

十、personservice.java 业务类源码:

package com.example.service;
import java.util.arraylist;
import java.util.list;
import android.content.context;
import android.database.cursor;
import android.database.sqlite.sqlitedatabase;
import com.example.domain.person;
public class personservice {
 private dboperatehelper dboperatehelper;
 public personservice(context context) {
 this.dboperatehelper = new dboperatehelper(context);
 }
  /**
   * 保存记录
   * @param person
   */
 public void save(person person){
 //得到数据库实例,里面封装了数据库操作方法
 sqlitedatabase sqldb = dboperatehelper.getwritabledatabase();
   //sqldb.execsql("insert into person(name,phone) values('"+person.getname()+"','"+person.getphone()+"')");
 //利用占位符可以避免注入,但是注意数组参与与占位符对应的字段要一一对应
 sqldb.execsql("insert into person(name,phone,amount) values(?,?,?)",new object[]{person.getname(),person.getphone(),person.getamount()});
   //关闭数据库
 sqldb.close();
 }
 /**
 * 删除记录
 * @param id
 */
 public void delete(integer id){
 sqlitedatabase sqldb = dboperatehelper.getwritabledatabase();
 sqldb.execsql("delete from person where personid=?",new object[]{id});
 sqldb.close();
 }
 /**
 * 更新记录
 * @param person
 */
 public void update(person person){
 sqlitedatabase sqldb = dboperatehelper.getwritabledatabase();
 sqldb.execsql("update person set name=?,phone=?,amount=? where personid=?",new object[]{person.getname(),person.getphone(),person.getamount(),person.getid()});
 sqldb.close();
 }
 /**
 * 通过id查询记录
 * @param id
 * @return
 */
 public person find(integer id){
 /**
  * getwritabledatabase 与 getreadabledatabase 的区别:
  * getreadabledatabase会先返回getwritabledatabase(可写),如果调用getwritabledatabase失败
  * 则才会调用getreadabledatabase后续方法,使数据库只读
  * 当写入的数据超过数据库大小则调用getwritabledatabase会失败
  * 所以只读时则可以使用此方法,其它情况(只要不是超过数据库大小)也可以使用此方法
  */
 sqlitedatabase sqldb = dboperatehelper.getreadabledatabase();
 cursor cursor = sqldb.rawquery("select * from person where personid=?", new string[]{string.valueof(id)});
 int personid;
 string name;
 string phone;
 int amount;
 person person = null;
 if(cursor.movetofirst()){
  personid = cursor.getint(cursor.getcolumnindex("personid"));
  name = cursor.getstring(cursor.getcolumnindex("name"));
  phone = cursor.getstring(cursor.getcolumnindex("phone"));
  amount = cursor.getint(cursor.getcolumnindex("amount"));
  person = new person(personid,name,phone,amount);
 }
 cursor.close();
 return person;
 }
 /**
 * 返回指定长度记录,limit 3,5,适用于分页
 * @param offset 起始
 * @param maxresult 长度
 * @return
 */
 public list<person> getscrolldata(int offset,int maxresult){
 sqlitedatabase sqldb = dboperatehelper.getreadabledatabase();
 cursor cursor = sqldb.rawquery("select * from person order by personid asc limit ?,?", new string[]{string.valueof(offset),string.valueof(maxresult)});
 int personid;
 string name;
 string phone;
 int amount;
 person person = null;
 list<person> persons = new arraylist<person>();
 while(cursor.movetonext()){
  personid = cursor.getint(cursor.getcolumnindex("personid"));
  name = cursor.getstring(cursor.getcolumnindex("name"));
  phone = cursor.getstring(cursor.getcolumnindex("phone"));
  amount = cursor.getint(cursor.getcolumnindex("amount"));
  person = new person(personid,name,phone,amount);
  persons.add(person);
 }
 cursor.close();
 return persons;
 }
 /**
 * 返回cursor
 * @param offset 起始
 * @param maxresult 长度
 * @return
 */
 public cursor getcursorscrolldata(int offset,int maxresult){
 sqlitedatabase sqldb = dboperatehelper.getreadabledatabase();
 cursor cursor = sqldb.rawquery("select personid as _id,name,phone,amount from person order by personid asc limit ?,?", new string[]{string.valueof(offset),string.valueof(maxresult)});
 return cursor;
 }
 /**
 * 返回总记录数
 * @return
 */
 public long getcount(){
 sqlitedatabase sqldb = dboperatehelper.getreadabledatabase();
 cursor cursor = sqldb.rawquery("select count(*) from person", null);
 //该查询语句值返回一条语句
 cursor.movetofirst();
 long result = cursor.getlong(0);
 cursor.close();
 return result;
 }
 public void payment(){
 sqlitedatabase sqldb = dboperatehelper.getwritabledatabase();
 sqldb.begintransaction();//开启事务
 try{
  sqldb.execsql("update person set amount = amount -10 where personid=1");
  sqldb.execsql("update person set amount = amount + 10 where personid=2");
  sqldb.settransactionsuccessful();//设置事务标志位true
 } finally {
  //结束事务:有两种情况:commit\rollback,事务提交或者回滚是由事务的标识决定的
  //事务为ture则提交,事务为flase则回滚,默认为false
  sqldb.endtransaction();
 }
 }
}

十一、otherpersonservice.java 业务类源码:

package com.example.service;
import java.util.arraylist;
import java.util.list;
import com.example.domain.person;
import android.content.contentvalues;
import android.content.context;
import android.database.cursor;
import android.database.sqlite.sqlitedatabase;
import android.database.sqlite.sqlitedatabase.cursorfactory;
import android.database.sqlite.sqliteopenhelper;
public class otherpersonservice {
 private dboperatehelper dboperatehelper;
 public otherpersonservice(context context) {
 this.dboperatehelper = new dboperatehelper(context);
 }
  /**
   * 保存记录
   * @param person
   */
 public void save(person person){
 //得到数据库实例,里面封装了数据库操作方法
 sqlitedatabase sqldb = dboperatehelper.getwritabledatabase();
   //sqldb.execsql("insert into person(name,phone) values('"+person.getname()+"','"+person.getphone()+"')");
 //利用占位符可以避免注入,但是注意数组参与与占位符对应的字段要一一对应
 //sqldb.execsql("insert into person(name,phone) values(?,?)",new object[]{person.getname(),person.getphone()});
 contentvalues values = new contentvalues();
 values.put("name", person.getname());
 values.put("phone", person.getphone());
 values.put("amount", person.getamount());
 //第一个参数是表名,第三个为字段值集合,第二个参数是空值字段,当第三个字段值集合为空时,系统会自动插入一条第二个参数为空的sql语句
 //否则当第三个参数为空时,如果第二个参数也为空,那么插入表就会找不到插入的字段信息,会报错
 sqldb.insert("person", "name", values );
 //关闭数据库
 sqldb.close();
 }
 /**
 * 删除记录
 * @param id
 */
 public void delete(integer id){
 sqlitedatabase sqldb = dboperatehelper.getwritabledatabase();
 //sqldb.execsql("delete from person where personid=?",new object[]{id});
 //第一个参数是表名,第二个是where后面的条件用占位符表示,第三个对应占位符为参数值
 sqldb.delete("person", "personid=?", new string[]{integer.tostring(id)});
 sqldb.close();
 }
 /**
 * 更新记录
 * @param person
 */
 public void update(person person){
 sqlitedatabase sqldb = dboperatehelper.getwritabledatabase();
 //sqldb.execsql("update person set name=?,phone=? where personid=?",new object[]{person.getname(),person.getphone(),person.getid()});
 //第一个参数为表名,第二个是一个更新值集合,采用键值对的形式,每个更新的字段对应更新值
 //第三个参数是where后面条件字段用占位符标识,第四个参数是对应where占位符的值
 contentvalues values = new contentvalues();
 values.put("name", person.getname());
 values.put("phone", person.getphone());
 values.put("amount", person.getamount());
 sqldb.update("person", values , "personid=?", new string[]{person.getid().tostring()});
 sqldb.close();
 }
 /**
 * 通过id查询记录
 * @param id
 * @return
 */
 public person find(integer id){
 /**
  * getwritabledatabase 与 getreadabledatabase 的区别:
  * getreadabledatabase会先返回getwritabledatabase(可写),如果调用getwritabledatabase失败
  * 则才会调用getreadabledatabase后续方法,使数据库只读
  * 当写入的数据超过数据库大小则调用getwritabledatabase会失败
  * 所以只读时则可以使用此方法,其它情况(只要不是超过数据库大小)也可以使用此方法
  */
 sqlitedatabase sqldb = dboperatehelper.getreadabledatabase();
 //cursor cursor = sqldb.rawquery("select * from person where personid=?", new string[]{string.valueof(id)});
 //第一个参数是表名;第二个参数是查询显示的字段,null时默认查询显示所有字段;
 //第三个参数是where查询条件占位符;第四个是占位符对应的值;
 //第五个参数是group by条件;第六个是having条件;第七个是order by条件
 cursor cursor = sqldb.query("person", null, "personid=?", new string[]{id.tostring()}, null, null, null);
 int personid;
 string name;
 string phone;
 int amount;
 person person = null;
 if(cursor.movetofirst()){
  personid = cursor.getint(cursor.getcolumnindex("personid"));
  name = cursor.getstring(cursor.getcolumnindex("name"));
  phone = cursor.getstring(cursor.getcolumnindex("phone"));
  amount = cursor.getint(cursor.getcolumnindex("amount"));
  person = new person(personid,name,phone,amount);
 }
 cursor.close();
 return person;
 }
 /**
 * 返回指定长度记录,limit 3,5,适用于分页
 * @param offset 起始
 * @param maxresult 长度
 * @return
 */
 public list<person> getscrolldata(int offset,int maxresult){
 sqlitedatabase sqldb = dboperatehelper.getreadabledatabase();
 //cursor cursor = sqldb.rawquery("select * from person order by personid asc limit ?,?", new string[]{string.valueof(offset),string.valueof(maxresult)});
 //第一个参数是表名;第二个参数是查询显示的字段,null时默认查询显示所有字段;
 //第三个参数是where查询条件占位符;第四个是占位符对应的值;
 //第五个参数是group by条件;第六个是having条件;第七个是order by条件
 //第八个参数是limit ?,? 条件
 cursor cursor = sqldb.query("person", null, null, null, null, null, "personid",offset+","+maxresult);
 int personid;
 string name;
 string phone;
 int amount;
 person person = null;
 list<person> persons = new arraylist<person>();
 while(cursor.movetonext()){
  personid = cursor.getint(cursor.getcolumnindex("personid"));
  name = cursor.getstring(cursor.getcolumnindex("name"));
  phone = cursor.getstring(cursor.getcolumnindex("phone"));
  amount = cursor.getint(cursor.getcolumnindex("amount"));
  person = new person(personid,name,phone,amount);
  persons.add(person);
 }
 cursor.close();
 return persons;
 }
 /**
 * 返回总记录数
 * @return
 */
 public long getcount(){
 sqlitedatabase sqldb = dboperatehelper.getreadabledatabase();
 //cursor cursor = sqldb.rawquery("select count(*) from person", null);
 //第一个参数是表名;第二个参数是查询显示的字段,null时默认查询显示所有字段;
 //第三个参数是where查询条件占位符;第四个是占位符对应的值;
 //第五个参数是group by条件;第六个是having条件;第七个是order by条件
 cursor cursor = sqldb.query("person", new string[]{"count(*)"}, null, null, null, null, null);
 //该查询语句值返回一条语句
 cursor.movetofirst();
 long result = cursor.getlong(0);
 cursor.close();
 return result;
 }
}

十二、personservicetest.java 单元测试类源码:

package com.example.test;
import java.util.list;
import com.example.domain.person;
import com.example.service.dboperatehelper;
import com.example.service.personservice;import android.test.androidtestcase;
import android.util.log;
public class personservicetest extends androidtestcase {
 public void testcreatedb() throws exception{
 dboperatehelper dbhelper = new dboperatehelper(getcontext());
 dbhelper.getwritabledatabase();
 }
 public void testsave() throws exception{
 personservice ps = new personservice(getcontext());
 for(int i=1;i<=100;i++){
  person person = new person();
  person.setname("我是"+i);
  person.setphone(string.valueof(long.parselong("18888888800")+i));
  ps.save(person);
  log.i("personservice",person.tostring());
 }
 }
 public void testdelete() throws exception{
 personservice ps = new personservice(getcontext());
 ps.delete(10);
 }
 public void testupdate() throws exception{
 personservice ps = new personservice(getcontext());
 ps.update(new person(1,"xiaopang","18887654321",0));
 }
 public void testfind() throws exception{
 personservice ps = new personservice(getcontext());
 person person = ps.find(1);
 log.i("personservice", person.tostring());
 }
 public void testgetscrolldata() throws exception{
 personservice ps = new personservice(getcontext());
 list<person> persons = ps.getscrolldata(3, 5);
 for(person person:persons){
  log.i("personservice",person.tostring());
 }
 }
 public void testgetcount() throws exception{
 personservice ps = new personservice(getcontext());
 long count = ps.getcount();
 log.i("personservice",count.tostring());
 }
 public void testupdateamount() throws exception{
 personservice ps = new personservice(getcontext());
 person person1 = ps.find(1);
 person person2 = ps.find(2);
 person1.setamount(100);
 person2.setamount(100);
 ps.update(person1);
 ps.update(person2);
 }
 public void testpayment() throws exception{
 personservice ps = new personservice(getcontext());
 ps.payment();
 }
}

十三、otherpersonservicetest 单元测试类源码:

package com.example.test;
import java.util.list;
import com.example.domain.person;
import com.example.service.dboperatehelper;
import com.example.service.otherpersonservice;
import android.test.androidtestcase;
import android.util.log;
public class otherpersonservicetest extends androidtestcase {
 public void testcreatedb() throws exception{
 dboperatehelper dbhelper = new dboperatehelper(getcontext());
 dbhelper.getwritabledatabase();
 }
 public void testsave() throws exception{
 otherpersonservice ps = new otherpersonservice(getcontext());
 for(int i=1;i<=100;i++){
  person person = new person();
  person.setname("我是"+i);
  person.setphone(string.valueof(long.parselong("18888888800")+i));
  ps.save(person);
  log.i("personservice",person.tostring());
 }
 }
 public void testdelete() throws exception{
 otherpersonservice ps = new otherpersonservice(getcontext());
 ps.delete(10);
 }
 public void testupdate() throws exception{
 otherpersonservice ps = new otherpersonservice(getcontext());
 ps.update(new person(1,"xiaopang","18887654321",0));
 }
 public void testfind() throws exception{
 otherpersonservice ps = new otherpersonservice(getcontext());
 person person = ps.find(1);
 log.i("personservice", person.tostring());
 }
 public void testgetscrolldata() throws exception{
 otherpersonservice ps = new otherpersonservice(getcontext());
 list<person> persons = ps.getscrolldata(3, 5);
 for(person person:persons){
  log.i("personservice",person.tostring());
 }
 }
 public void testgetcount() throws exception{
 otherpersonservice ps = new otherpersonservice(getcontext());
 long count = ps.getcount();
 log.i("personservice",count.tostring());
 }
}

十四、注意事项以及相关知识点:

1、掌握sqlite数据库如何创建数据库、建立表、维护字段等操作
继承sqliteopenhelper类,构造函数调用父类构造函数创建数据库,利用oncreate创建表,利用onupgrade更新表字段信息

2、掌握sqlite数据库如何增、删、改、查以及分页
取得sqlitedatabase的实例,然后调用该实例的方法可以完成上述操作
sqlitedatabase提供两种操作上述功能的方式:一是直接调用execsql书写sql语句,另一种是通过insert、update、delete、query等方法来传值来拼接sql,前一种适合熟练掌握sql 语句的

3、对需要数据同步的处理请添加事务处理,熟悉事务的处理方式

4、了解各个方法参数的意义以及传值

5、掌握listview显示后台数据的使用方法
simpleadapter、simplecursoradapter以及自定义适配器的使用,以及onitemclicklistener取值时各个适配器返回值的区别以及取值方法

6、多学、多记、多练、多思,加油!

更多关于android相关内容感兴趣的读者可查看本站专题:《android开发入门与进阶教程》、《android通信方式总结》、《android基本组件用法总结》、《android视图view技巧总结》、《android布局layout技巧总结》及《android控件用法总结

希望本文所述对大家android程序设计有所帮助。