首先,是布局文件,非常的简单,一个可以滑动的ScrollView包裹一个线性布局,线性布局里面无内容
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
android:id="@+id/ll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
为了方面使用,我们定义一个person类,这个类中包含了我们需要查询的那个数据库的信息名称。
package com.neusoft.show.domal;
public class Person {
private String _id;
private String name;
private String salary;
private String phone;
public Person(String _id, String name, String salary, String phone) {
super();
this._id = _id;
this.name = name;
this.salary = salary;
this.phone = phone;
}
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSalary() {
return salary;
}
public void setSalary(String salary) {
this.salary = salary;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return _id + "," + name + ", " + salary+ ", " + phone ;
}
}
接下来,再来一个MyOpenHelper类,这个类用来创建数据库和升级数据库用的
package com.neusoft.show;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class MyOpenHelper extends SQLiteOpenHelper {
public MyOpenHelper(Context context) {
super(context,"people.db",null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table person(_id integer primary key autoincrement,name char(20),salary char(20),phone char(20))");
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
System.out.print("数据库升级了!!!");
}
}
最后一步,就是把数据库中的内容显示到手机的屏幕上。理所应当,我们应该查询数据库,然后得到值,再把它显示到手机屏幕上。这里由于刚开始学,所以,我们用的最简单的TextView,就没用ListView了。我的思路是,每有一个数据,就创建一个TextView,然后把这些TextView插入到一个List集合中,最后循环显示到界面。
package com.neusoft.show;
import java.util.ArrayList;
import java.util.List;
import com.neusoft.show.domal.Person;
import android.R.integer;
import android.os.Bundle;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.view.Menu;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
List personList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
personList=new ArrayList();
//从数据库里面把数据取出来
MyOpenHelper oh = new MyOpenHelper(this);
SQLiteDatabase db = oh.getWritableDatabase();
Cursor cursor = db.query("person", null, null, null, null, null, null);
while (cursor.moveToNext()) {
String _id = cursor.getString(cursor.getColumnIndex("_id"));
String name = cursor.getString(cursor.getColumnIndex("name"));
String salary = cursor.getString(cursor.getColumnIndex("salary"));
String phone = cursor.getString(cursor.getColumnIndex("phone"));
Person p=new Person(_id, name, salary, phone);
personList.add(p);
}
LinearLayout ll=(LinearLayout) findViewById(R.id.ll);
//把数据显示到屏幕
for(Person p:personList)
{
//1.集合中每有一条数据,就new一个TextView
TextView tv=new TextView(this);
//2.把人物的信息设置为文本的内容
tv.setText(p.toString());
tv.setTextSize(18);
//3.把TextView设置成线性布局的子节点
ll.addView(tv);
}
}
}
原文:http://blog.csdn.net/zyx520ytt/article/details/51346886