android - sqlite database not created -

i using standard approach learned popular notepad example building first app.
got stuck strange problem.
sqlite database file (.db) not being created in /data/data/package/databases. have cross checked manifest file , openhelper file headfirst android dev. book ( using reference ) found myself unable figure out why database file not created..
there special permissions or need switch on working??
strange thing working fine pre-loaded examples. means '.db' file created notepad example when try, fails. :(
here files.

package - database.test

1. androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?> 

<uses-sdk android:minsdkversion="10" />  <application     android:icon="@drawable/ic_launcher"     android:label="@string/app_name" >     <activity         android:name=".database_testactivity"         android:label="@string/app_name" >     </activity> </application> 

2.testopenhelper.java

package database.test;  import android.content.context; import android.database.sqlite.sqlitedatabase; import android.database.sqlite.sqliteopenhelper;  public class testopenhelper extends sqliteopenhelper {  testopenhelper(context context){     super(context,"mydb.db",null,1); } @override public void oncreate(sqlitedatabase database){     database.execsql("create table test_1 " + " (field1 integer primary key, field2 integer);"); } public void onupgrade (sqlitedatabase database, int oldversion, int newversion){     database.execsql("drop table if exists test1");     oncreate(database); } } 

3.database_testactivity.java

package database.test;  import android.app.activity; import android.os.bundle; import android.widget.listview;  public class database_testactivity extends activity { /** called when activity first created. */ @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main);      listview listview = (listview)findviewbyid(r.id.test_list);     testadapter ta = new testadapter();     listview.setadapter(ta);      testopenhelper openhelper = new testopenhelper(this); } }    

i know basic question, have been trying solve last fifteen days , frustrated.
please ..

change this:

database.execsql("create table test_1 " + " (field1 integer primary key, field2 integer)"); 

and testopenhelper openhelper = new testopenhelper(this); change sqlitedatabase db = new testopenhelper(this).getwritabledatabase();

you didn't created database, create instance of sqliteopenhelper create or open database have use getwritabledatabase() or getreadabledatabase() method.

exactly docs:

create and/or open database used reading , writing.