Как остановить мою программу от создания базы данных заново в android sqlite?

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Я делаю приложение, которое требует, чтобы я проверил, существует ли база данных, иначе я ее создаю.Мой код работает в первый раз. Но впоследствии, когда я пытаюсь вызвать другие методы внутри класса, содержащего конструктор sqlite, моя прежняя база данных стирается и создается новая, потому что я вызываю конструктор.

Что я уже пробовал:

package com.pass;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.io.File;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    String DB_NAME = "passManager.db";
    String TAG = "MY DATABASE";

    Database database;
    //FOR REGISTRATION
    EditText MASTER_EM, MASTER_PASS, MASTER_CPASS, MASTER_QUES, MASTER_ANS;
    String masterEmail, masterPass, masterConfirmPass, masterQuestion, masterAnswer;
    Context context;

    //FOR LOGIN
    EditText TEXTEMAIL, TEXTPASSWORD;
    String loginEmail, loginPassword;
    Button btn,btn2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        context = this;
        boolean status = dataBaseExist(DB_NAME);
        database = new Database(context);
        if(status){

            setContentView(R.layout.register);
            //collect values from UI for registration
            MASTER_EM = (EditText) findViewById(R.id.MASTER_EMAIL_REG);
            MASTER_PASS = (EditText) findViewById(R.id.MASTER_PASSWORD_REG);
            MASTER_CPASS = (EditText)findViewById(R.id.RMASTER_PASSWORD);
            MASTER_QUES = (EditText) findViewById(R.id.QUESTION);
            MASTER_ANS = (EditText) findViewById(R.id.ANSWER);
            btn = (Button) findViewById(R.id.REGISTER_ACCT);
            btn.setOnClickListener(this);
        }
        else{
            setContentView(R.layout.activity_main);

            //collect values from UI for login
            TEXTEMAIL = (EditText) findViewById(R.id.txtemail);
            TEXTPASSWORD = (EditText) findViewById(R.id.txtpass);

            btn2 = (Button)findViewById(R.id.btnsignin);
            btn2.setOnClickListener(this);

        }

    }

   private boolean dataBaseExist(String databaseName){
       boolean val = false;
       File database=getApplicationContext().getDatabasePath(databaseName);
       //File d = getApplicationContext().getFilesDir().getPath(databaseName);

       if (!database.exists()) {

           val = true;
           Log.i("My Database", "Not Found");

       } else {

           Log.i("My Database", "Found");
       }

       return val;
   }


    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.REGISTER_ACCT :

                masterPass = MASTER_PASS.getText().toString();
                masterConfirmPass = MASTER_CPASS.getText().toString();
                masterEmail = MASTER_EM.getText().toString();
                masterQuestion = MASTER_QUES.getText().toString();
                masterAnswer = MASTER_ANS.getText().toString();

                    if(!masterPass.equals(masterConfirmPass)){

                        Toast.makeText(this, "PASSWORD & PASSWORD CONFIRM DID NOT MATCH", Toast.LENGTH_LONG).show();

                    }
                    else {
                        //Save the Data to Database
                        UserInfoAsynctask userInfoAsynctask = new UserInfoAsynctask(context);
                        userInfoAsynctask.execute("insert",masterEmail,masterPass,masterQuestion,masterAnswer);

                        //Restart app
                        Intent i = getBaseContext().getPackageManager()
                                .getLaunchIntentForPackage( getBaseContext().getPackageName() );
                        i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(i);

                    }
                break;
            case R.id.btnsignin :
                loginEmail = TEXTEMAIL.getText().toString();
                loginPassword = TEXTPASSWORD.getText().toString();
                long check = database.authMaster(loginEmail, loginPassword);
                    if(check == 1){
                        Intent intent = new Intent(MainActivity.this, Profile.class);
                        intent.putExtra("email", loginEmail);
                        startActivity(intent);
                    }
                break;

        }
    }
//Here is the Class for the Database 
package com.pass;

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

public class Database extends SQLiteOpenHelper {

    //LOGCAT MESSAGE TAG
    private static final String LOGCAT = "DATABASE CLASS : ";

    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "passManager.db";

    // Table Names
    private static final String TABLE_SITES = "sites";
    private static final String TABLE_NOTES = "notes";
    private static final String TABLE_USER = "user";
    private static final String TABLE_NOTE_CAT = "note_cat";

    // SITES Table - column nmaes
    private static final String URL_ID = "url";
    private static final String USERNAME = "username";
    private static final String PASSWORD = "password";

    // NOTES Table - column names
    private static final String NOTE_ID = "note_id";
    private static final String NOTES_NOTE_CAT = "note_cat";
    private static final String NOTE_DESC = "note_desc";
    private static final String NOTE_BODY = "note_body";
    private static final String NOTE_DATE = "note_date";



    // NOTE CATEGORY TABLE - column names
    private static final String CAT_ID = "note_cat";
    private static final String CAT_DESC = "desc";

    //MASTER USER ACCOUT TABLE
    private static final String USER_ID = "email";
    private static final String USER_PASSWORD = "password";
    private static final String USER_QUESTION = "question";
    private static final String USER_ANSWER = "answer";

    //CREATE TABLE QUERIES [USER ACCOUNT]
    private static final String CREATE_TABLE_USER_ACCT = "CREATE TABLE "
            + TABLE_USER
            + "("
            + USER_ID + " TEXT PRIMARY KEY,"
            + USER_PASSWORD + " TEXT,"
            + USER_QUESTION + " TEXT,"
            + USER_ANSWER + " TEXT"
            + ")";

    /* NOTE CAT table create statement */
    private static final String CREATE_TABLE_NOTE_CAT = "CREATE TABLE " + TABLE_NOTE_CAT
            + "(" + CAT_ID + " TEXT PRIMARY KEY," + CAT_DESC + " TEXT" + ")";

    /* NOTES table create statement */
    private static final String CREATE_TABLE_NOTES = "CREATE TABLE "
            + TABLE_NOTES + "(" + NOTE_ID + " TEXT PRIMARY KEY," + NOTES_NOTE_CAT + " TEXT," + NOTE_DESC
            + " TEXT," + NOTE_BODY + " TEXT," + NOTE_DATE
            + " TEXT" + ")";

    /* Sites table create statement */
    private static final String CREATE_TABLE_SITES = "CREATE TABLE "
            + TABLE_SITES + "(" + URL_ID + " TEXT PRIMARY KEY," + USERNAME
            + " TEXT," + PASSWORD + " TEXT" + ")";

    public Database(Context context) {

        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        Log.d("Database ",DATABASE_NAME+" Created");
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        //create tables
        db.execSQL(CREATE_TABLE_SITES);
        Log.d("Tables ",TABLE_SITES + " created");

        db.execSQL(CREATE_TABLE_NOTE_CAT);
        Log.d("Tables ",TABLE_NOTE_CAT + " created");

        db.execSQL(CREATE_TABLE_NOTES);
        Log.d("Tables ",TABLE_NOTES + " created");

        db.execSQL(CREATE_TABLE_USER_ACCT);
        Log.d("Tables ",CREATE_TABLE_USER_ACCT + " created");
    }


    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // on upgrade drop older tables
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_NOTE_CAT);
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_NOTES);
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_SITES);
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_USER);
        Log.d("Tables ",TABLE_SITES + " created");
        // create new tables
        onCreate(db);
    }

    //INSERT INTO USER ACCT TABLE
    public long createUser(String email,String password,String question,String answer){

        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(USER_ID, email);
        values.put(USER_PASSWORD, password);
        values.put(USER_QUESTION, question);
        values.put(USER_ANSWER, answer);

        Log.d("Reply","User Created....Sucessfully");
    return db.insert(TABLE_USER,null,values);


    }
    public long authMaster(String userName, String pass) {
        Log.i("NOTE ", userName + "+" + pass);
    return 1;
    }
}

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