android database file not loading on real device, Basic Computer Science

Assignment Help:
i have an android app which uses a database file called question db which is stored in the assets file. I have tried a database example called android application development but for some reason it doesnt seem to work on the real device

Here is the database code

package net.learn2develop.Databases;

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

public class DBAdapter {
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "name";
public static final String KEY_EMAIL = "email";
private static final String TAG = "DBAdapter";

private static final String DATABASE_NAME = "MyDB";
private static final String DATABASE_TABLE = "contacts";
private static final int DATABASE_VERSION = 2;

private static final String DATABASE_CREATE =
"create table contacts (_id integer primary key autoincrement, "
+ "name text not null, email text not null);";

private final Context context;

private DatabaseHelper DBHelper;
private SQLiteDatabase db;

public DBAdapter(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}

private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db)
{
try {
db.execSQL(DATABASE_CREATE);
} catch (SQLException e) {
e.printStackTrace();
}
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS contacts");
onCreate(db);
}
}

//---opens the database---
public DBAdapter open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}

//---closes the database---
public void close()
{
DBHelper.close();
}

//---insert a contact into the database---
public long insertContact(String name, String email)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_NAME, name);
initialValues.put(KEY_EMAIL, email);
return db.insert(DATABASE_TABLE, null, initialValues);
}

//---deletes a particular contact---
public boolean deleteContact(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}

//---retrieves all the contacts---
public Cursor getAllContacts()
{
return db.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_NAME,
KEY_EMAIL}, null, null, null, null, null);
}

//---retrieves a particular contact---
public Cursor getContact(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
KEY_NAME, KEY_EMAIL}, KEY_ROWID + "=" + rowId, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}

//---updates a contact---
public boolean updateContact(long rowId, String name, String email)
{
ContentValues args = new ContentValues();
args.put(KEY_NAME, name);
args.put(KEY_EMAIL, email);
return db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
}

I am wondering if its a problem with my phone


Related Discussions:- android database file not loading on real device

DBMS, what is the meaning of data definition

what is the meaning of data definition

Mini computers and micro computers, Mini Computers and Micro Computers: ...

Mini Computers and Micro Computers: The mini computers are intermediate in power, and may function as small mainframe computers. They are often dedicated to a particular purpo

Machine Learning, Hi I have a 8 question machine learning problem sheet due...

Hi I have a 8 question machine learning problem sheet due to the 25th of december. The exercises require knowledge of basic classifiers, logistic regression, naive bayes, mixture o

ASP.net, educational website project

educational website project

Desk top publishing program, Desk Top Publishing Program: Desktop publ...

Desk Top Publishing Program: Desktop publishing programs contain many of the features of word processing software, but .go even further in the ability to layout the format of

C++, whats the out put of int main(){ int n=310; funcone(n); functwo(&n); ...

whats the out put of int main(){ int n=310; funcone(n); functwo(&n); cout return 0; } void funcone(intn) n=240; } void func two(intn*) { n=120; }

Arrays and strings, This is a C file. 1. The program starts by printing you...

This is a C file. 1. The program starts by printing your name with an end sign ">". For example, "NAME >"; 2. Then, you can type in a string. If the string is not "vi xxx", you pri

Python Strings and Python Lists, Python Strings: Strings in Python are rec...

Python Strings: Strings in Python are recognized as an adjacent set of characters in among quotation marks. Python permits for either pairs of single or double quotes. Subsets of s

Command Line Arguments, You may have seen, as, that many programs can be ru...

You may have seen, as, that many programs can be run so that they give you with some basic information concerning how they should be run. Python permits you to do this with -h: $ p

Types of chat room, Types of chat room: Java Chat rooms: The most comm...

Types of chat room: Java Chat rooms: The most common and popular chat scripts are based on java which is object oriented language. Java is freely available and comes with virt

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd