在模拟器上显示数据库中提取的信息的列表

时间有限，就不写注释了，看得懂的就看，看不懂的到晚上查资料

创建一个db的androiproject项目

同时创建一个MainActivity的Acitivity.java的类

新建com.gohighsoft.db包



MainActivity.java:

package com.gohighsoft.db;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {
private final static String TAG = "aa";
private PersonService personService;
private ListView listView;

// private PersonService personService;

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  personService = new PersonService(this);// 前十条数据
  List<Person> persons = personService.getScrollData(0, 100);
  listView = (ListView) findViewById(R.id.personList);
  List<HashMap<String, String>> data = new ArrayList<HashMap<String, String>>();
  HashMap<String, String> title = new HashMap<String, String>();
  title.put("personid", "编号");
  title.put("name", "姓名");
  title.put("age", "年龄");
  data.add(title);
  for (Person person : persons) {
   HashMap<String, String> map = new HashMap<String, String>();
   map.put("personid", String.valueOf(person.getId()));
   map.put("name", person.getName());
   map.put("age", String.valueOf(person.getAge()));
   data.add(map);
  }
  SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, data,
    R.layout.personitem,
    new String[] { "personid", "name", "age" }, new int[] {
      R.id.personid, R.id.name, R.id.age });
  listView.setAdapter(adapter);
  listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> parent, View view,
     int position, long id) {
    ListView listView = (ListView) parent;
    HashMap<String, String> itemData = (HashMap<String, String>) listView
      .getItemAtPosition(position);
    String personid = itemData.get("personid");
    String name = itemData.get("name");
    String age = itemData.get("age");
    Log.i(TAG, "className" + view.getClass().getName());
    // 打印view的类名
    Log.i("TAG", "personid=" + personid + ",name=" + name + ",age="
      + age);
    Log.i(TAG, "result=" + (position == id));
   }
  });
}
}

在Layout文件夹下创建personitem.xml的界面配置代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<TextView android:layout_width="60px" android:layout_height="60px"
  android:id="@+id/personid" />
<TextView android:layout_width="160px" android:layout_height="wrap_content"
  android:layout_toRightOf="@id/personid" android:layout_alignTop="@id/personid"
  android:gravity="center_horizontal" android:id="@+id/name" />
 
<TextView android:layout_width="wrap_content"
  android:layout_height="wrap_content" android:layout_toRightOf="@id/name"
  android:layout_alignTop="@id/name" android:id="@+id/age" />
</LinearLayout>


新建一个工具类DataBaseHaler.java:

package com.gohighsoft.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DataBaseHaler extends SQLiteOpenHelper {
private static final String NAME = "sharp.db";// 。db可有可无
private static final int version = 1;// 版本号不能为0

public DataBaseHaler(Context context) {
  super(context, NAME, null, version);
}

@Override
public void onCreate(SQLiteDatabase db) {
  Log.i("aa","1111111111111");
  db.execSQL("CREATE TABLE person(personid integer primary key autoincrement,name varchar(20),age integer)");

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVewsion) {
  Log.i("aa","22222222222222");
  db.execSQL("DROP TABLE IF EXISTS PERSON");
  onCreate(db);
}
}


新近一个PersonService.java的服务类:

package com.gohighsoft.db;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

public class PersonService {
private DataBaseHaler databaseHelper;
private Context context;

public PersonService(Context context) {
  this.context = context;
  databaseHelper = new DataBaseHaler(context);
}

public void savesTrannces(Person person) {
  Log.i("aa", "4444444444444");
  SQLiteDatabase db = databaseHelper.getWritableDatabase();
  db.beginTransaction();// 开始事务
  try {
  
   for(int i=0;i<100;i++){
    db.execSQL("insert into person(name,age) values(?,?)",
      new Object[] { person.getName(), person.getAge() });
   }
   db.execSQL("insert into personww(namedd,age) values(?,?)",
     new Object[] { person.getName(), person.getAge() });
   db.setTransactionSuccessful();
  } catch (Exception e) {
   //db.endTransaction();// 事务结束;
   Log.i("aa","wwwwwwwwwwwwwwwwwwwwwwwww");
  }
  db.endTransaction();// 事务结束;
  Log.i("aa", "55555555555555555555");
}

public void save1(Person person) {
  SQLiteDatabase db = databaseHelper.getWritableDatabase();
 
  db.beginTransaction();// 开始事务
  Log.i("aa", "uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu");
  try {
   db.setTransactionSuccessful();
   db.execSQL("insert into person(name,age) values('Tom',21)");
  } catch (Exception e) {
   Log.i("aa", "trttttttttttttttttttttttttttttttttttttttttttttt");
  }
  db.endTransaction();// 事务结束;
}

public void save2(Person person) {
  SQLiteDatabase db = databaseHelper.getWritableDatabase();
  db.beginTransaction();// 开始事务
  Log.i("aa", "uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu");
  try {
   db.setTransactionSuccessful();
   for(int i=0;i<100;i++){
    db.execSQL("insert into person(name,age) values(?,?)",
      new Object[] { person.getName(), person.getAge() });
   }
  } catch (Exception e) {
   Log.i("aa", "trttttttttttttttttttttttttttttttttttttttttttttt");
  }
  db.endTransaction();// 事务结束;
}

public void update(Person person) {
  SQLiteDatabase db = databaseHelper.getWritableDatabase();
  db.execSQL(
    "update person set name=?,age=? where personid=?",
    new Object[] { person.getName(), person.getAge(),
      person.getId() });
}

public Person find(Integer id) {
  SQLiteDatabase db = databaseHelper.getReadableDatabase();
  Cursor cursor = db.rawQuery(
    "select personid,name,age from person where personid=?",
    new String[] { String.valueOf(id) });
  if (cursor.moveToNext()) {
   Person person = new Person();

   person.setId(cursor.getInt(cursor.getColumnIndex("personid")));
   person.setName(cursor.getString(1));
   person.setAge(cursor.getInt(2));
   return person;
  }
  cursor.close();
  return null;
}

public void delete(Integer id) {
  SQLiteDatabase db = databaseHelper.getWritableDatabase();
  db.execSQL("delete fro person where personid=?", new Object[] { id });
}

public List<Person> getScrollData(int firstResult, int maxResult) {
  List<Person> persons = new ArrayList<Person>();
  SQLiteDatabase db = databaseHelper.getReadableDatabase();
  Cursor cursor = db.rawQuery(
    "select personid,name,age from person limit ?,?",
    new String[] { String.valueOf(firstResult),
      String.valueOf(maxResult) });// firstResult开始索引
  while (cursor.moveToNext()) {// maxResult每页获取的记录数
   Log.i("aa", "333333333333");
   Person person = new Person();
   person.setId(cursor.getInt(cursor.getColumnIndex("personid")));
   person.setName(cursor.getString(1));
   person.setAge(cursor.getInt(2));
   persons.add(person);
  }
  cursor.close();
  return persons;
}

public long getCount() {
  SQLiteDatabase db = databaseHelper.getReadableDatabase();
  Cursor cursor = db.rawQuery("select count(*) from person", null);
  // 没有占位符参数的话，直接用null
  cursor.moveToFirst();
  Long count = cursor.getLong(0);
  cursor.close();
  return count;
}
}
实体类传递数据：Person.java

package com.gohighsoft.db;

public class Person {
private Integer id;
private String name;
private Integer age;

public Person() {
};

public Person(String name, Integer age) {
  this.name = name;
  this.age = age;
}

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 Integer getAge() {
  return age;
}

public void setAge(Integer age) {
  this.age = age;
}

public String toString() {
  return "Person [age=" + age + ",id=" + id + ",name" + name + "]";
}
}

最后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">
<ListView android:id="@+id/personList" android:layout_width="fill_parent"
  android:layout_height="wrap_content" />
</LinearLayout>
好了到此为止算是完成了，直接运行MainActivity.java就可以了


看不懂的自己上网去查去，不再详细的解释了.