Connecting to Sqlite Db

[pytho]

Hi guys,

I'm completely new to android dev but have been having a lot of fun with it so far.. I've been following the reigndesign guide to learn how to use a pre-constructed sqlite database in an application.

I (think) I followed all of the directions, and there are no errors in the program, but I keep getting this error:

[2012-03-05 21:45:35 - Access DB] ActivityManager: at dalvik.system.NativeStart.main(Native Method)
[2012-03-05 21:45:38 - Access DB] Starting activity access.db.AccessDBActivity on device emulator-5554
[2012-03-05 21:45:42 - Access DB] ActivityManager: Error type 2
[2012-03-05 21:45:42 - Access DB] ActivityManager: android.util.AndroidException: Can't connect to activity manager; is the system running?
[2012-03-05 21:45:42 - Access DB] ActivityManager: at com.android.commands.am.Am.run(Am.java:99)
[2012-03-05 21:45:42 - Access DB] ActivityManager: at com.android.commands.am.Am.main(Am.java:80)
[2012-03-05 21:45:42 - Access DB] ActivityManager: at com.android.internal.os.RuntimeInit.finishInit(Native Method)
[2012-03-05 21:45:42 - Access DB] ActivityManager: at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:238)
[2012-03-05 21:45:42 - Access DB] ActivityManager: at dalvik.system.NativeStart.main(Native Method)
[2012-03-05 21:46:43 - Access DB] HOME is up on device 'emulator-5554'
[2012-03-05 21:46:47 - Access DB] Uploading Access DB.apk onto device 'emulator-5554'
[2012-03-05 21:46:47 - Access DB] Installing Access DB.apk...
[2012-03-05 21:47:30 - Access DB] Success!
[2012-03-05 21:47:30 - Access DB] Failed to install Access DB.apk on device 'emulator-5554': device not found
[2012-03-05 21:47:30 - Access DB] com.android.ddmlib.InstallException: device not found
[2012-03-05 21:47:30 - Access DB] Launch canceled!

Here is my code:

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;

public class DataBaseHelper extends SQLiteOpenHelper{
    

public void main() {
        DataBaseHelper myDbHelper = new DataBaseHelper(myContext);
        myDbHelper = new DataBaseHelper(null);

        try {

            myDbHelper.createDataBase();

        } catch (IOException ioe) {

            throw new Error("Unable to create database");

        }

        try {

            myDbHelper.openDataBase();

        }catch(SQLException sqle){

            throw sqle;

        }
    }
 
    //The Android's default system path of your application database.
    private static String DB_PATH = "/data/data/access.db/databases/";
 
    private static String DB_NAME = "myDBName";
 
    private SQLiteDatabase myDataBase; 
 
    private final Context myContext;
 
    /**
     * Constructor
     * Takes and keeps a reference of the passed context in order to access to the application assets and resources.
     * @param dataBaseHelper
     */
    public DataBaseHelper(Context dataBaseHelper) {
        

        super(dataBaseHelper, DB_NAME, null, 1);
        this.myContext = dataBaseHelper;
    }    
        
 
  /**
     * Creates a empty database on the system and rewrites it with your own database.
     * */
    public void createDataBase() throws IOException{
 
        boolean dbExist = checkDataBase();
 
        if(dbExist){
            //do nothing - database already exist
        }else{
 
            //By calling this method and empty database will be created into the default system path
               //of your application so we are gonna be able to overwrite that database with our database.
            this.getReadableDatabase();
 
            try {
 
                copyDataBase();
 
            } catch (IOException e) {
 
                throw new Error("Error copying database");
 
            }
        }
 
    }
 
    /**
     * Check if the database already exist to avoid re-copying the file each time you open the application.
     * @return true if it exists, false if it doesn't
     */
    private boolean checkDataBase(){
 
        SQLiteDatabase checkDB = null;
 
        try{
            String myPath = DB_PATH + DB_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
 
        }catch(SQLiteException e){
 
            //database does't exist yet.
 
        }
 
        if(checkDB != null){
 
            checkDB.close();
 
        }
 
        return checkDB != null ? true : false;
    }
 
    /**
     * Copies your database from your local assets-folder to the just created empty database in the
     * system folder, from where it can be accessed and handled.
     * This is done by transfering bytestream.
     * */
    private void copyDataBase() throws IOException{
 
        //Open your local db as the input stream
        InputStream myInput = myContext.getAssets().open(DB_NAME);
 
        // Path to the just created empty db
        String outFileName = DB_PATH + DB_NAME;
 
        //Open the empty db as the output stream
        OutputStream myOutput = new FileOutputStream(outFileName);
 
        //transfer bytes from the inputfile to the outputfile
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myInput.read(buffer))>0){
            myOutput.write(buffer, 0, length);
        }
 
        //Close the streams
        myOutput.flush();
        myOutput.close();
        myInput.close();
 
    }
 
    public void openDataBase() throws SQLException{
 
        //Open the database
        String myPath = DB_PATH + DB_NAME;
        myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
 
    }
 
    @Override
    public synchronized void close() {
 
            if(myDataBase != null)
                myDataBase.close();
 
            super.close();
 
    }
 
    @Override
    public void onCreate(SQLiteDatabase db) {
 
    }
 
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 
    }
    
        }
 
        // Add your public helper methods to access and get content from the database.
       // You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
       // to you to create adapters for your views.

Any help is greatly appreciated!