Android-приложение работает на эмуляторе, но вылетает при запуске на устройстве

Я прочитал тысячи страниц и еще не нашел решения. Я относительно новичок в Android Development, и это первый раз, когда я развертываю любое приложение на мобильном устройстве, и моя проблема заключается в том, что приложение работает на моем эмуляторе безупречно, но на моем устройстве он падает при запуске. Я как бы указал на ошибку, связанную с доступом к данным из базы данных, которую я упаковываю с помощью приложения.

В основном, мое первое действие вызывает функцию для извлечения кода аэропорта из БД. Он получает функцию в моем файле DBContext и возвращает ошибку:

    0java.lang.RuntimeException: Unable to start activity ComponentInfo{com.maziz.POS/com.maziz.POS.Login}: java.lang.NullPointerException
    1at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
    2at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
    3at android.app.ActivityThread.access$1500(ActivityThread.java:117)
    4at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
    5at android.os.Handler.dispatchMessage(Handler.java:99)
    6at android.os.Looper.loop(Looper.java:130)
    7at android.app.ActivityThread.main(ActivityThread.java:3683)
    8at java.lang.reflect.Method.invokeNative(Native Method)
    9at java.lang.reflect.Method.invoke(Method.java:507)
    10at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
    11at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
    12at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException
    13at com.maziz.POS.POSContext.getAirportCodes(POSContext.java:178)
    14at com.maziz.POS.Login.onCreate(Login.java:29)
    15at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
    16at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
    17... 11 more

FirstActivity: Login.java

    package com.maziz.POS;

    import android.app.Activity;
    import android.app.AlertDialog;
    import android.content.Context;
    import android.content.DialogInterface;
    import android.content.Intent;
    import android.database.Cursor;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.WindowManager;
    import android.view.inputmethod.InputMethodManager;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    import android.widget.Toast;
    import com.bugsense.trace.BugSenseHandler;
    public class Login extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    // Creates instance of all Global Vars
    // GlobalVars gv = (GlobalVars) getApplicationContext();
    BugSenseHandler.setup(this, "00728e23");
    GlobalVars gv = (GlobalVars) getApplicationContext();
    Cursor cc = gv.db.getAirportCodes();

    while(cc.moveToNext())
    {
        for (int i = 0; i < cc.getColumnCount(); i++) {
              gv.Airport_Codes.add(cc.getString(i));
            }
    }

    final EditText txtUserID = (EditText) findViewById(R.id.txtUserID);
    final EditText txtPassword = (EditText) findViewById(R.id.txtPassword);
    Button btnLogin = (Button) findViewById(R.id.btnLogin);

    btnLogin.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            String userID = txtUserID.getText().toString();
            String password = txtPassword.getText().toString();

            if (checkLogin(userID, password)) {
                Toast.makeText(getApplicationContext(), "Logging in...",
                        Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(v.getContext(),
                        FASelection.class);
                startActivity(intent);


            } else {
                AlertDialog.Builder ad = new AlertDialog.Builder(Login.this);
                ad.setMessage("Login Not Successful");
                ad.setNeutralButton("OK",
                        new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog,
                                    int which) {
                                // TODO Auto-generated method stub
                                Toast.makeText(getApplicationContext(),
                                        "Re-Enter Your Info...",
                                        Toast.LENGTH_SHORT).show();
                            }
                        });
                ad.show();
            }
        }
    });
}

public boolean checkLogin(String u, String p) {
    GlobalVars gv = (GlobalVars) getApplicationContext();

    Cursor c = gv.db.getUser(u);

    User temp = new User();
    temp.setUserID(c.getString(c.getColumnIndex("Employee_ID")));
    temp.setPassword(c.getString(c.getColumnIndex("Password")));
    boolean exists = false;

    if(c == null)
        return false;

    if (temp.UserID.equalsIgnoreCase(u)) {
        if (temp.Password.equals(p)) {
            gv.user = temp;

            gv.PK_Login_Log = (int) gv.db.insertLoginLogInfo(u, 1000);

            return true;
        } else
            exists = false;
    }

    return exists;
        }
    }

Тогда это мой POSContext (DB Context Class):

    package com.maziz.POS;

    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Calendar;
    import java.util.Date;

    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.SQLiteException;
    import android.database.sqlite.SQLiteOpenHelper;
    import android.util.Log;

    public class POSContext extends SQLiteOpenHelper{

        //The Android default system path of your application database.
        private static String DB_PATH = "/data/data/com.maziz.POS/databases/";

        private static String DB_NAME = "AndroidPOS.sqlite";

        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 context
 */
        public POSContext(Context context) {

    super(context, DB_NAME, null, 1);
    this.myContext = context;
}   

      /**
         * 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(){
    File dbFile = new File(DB_PATH + DB_NAME);
    return dbFile.exists();

/* 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[2048];
    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_READWRITE);

}

@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.

public Cursor getUser(String uID)
{
    Cursor mCursor = myDataBase.query(true, "FA_Login", new String[] { 
            "PK_FA_Login", "Airline_ID", "Employee_ID", "Password"},
            "Employee_ID = '" + uID + "'", null, null, null, null, null);

    if (mCursor != null) {
        mCursor.moveToFirst();
        }

    return mCursor;
}

public Cursor getAirportCodes()
{
    Cursor mCursor = myDataBase.query("Airport_Codes", new String[] { 
            "Airport_Code"
    }, null, null, null, null, "Airport_Code");

    return mCursor;
}

public Cursor getFlightByOriginDestination(String origin, String dest)
{
    Cursor mCursor = myDataBase.query("Inventory_Flight_Schedule", new String[] {
            "PK_Inventory_Flight_Schedule", "Flight_Number", "AC_Type", "Time", "Origin", "Destination"
    }, "Origin = '" + origin + "' AND Destination = '" + dest + "'", null, null, null, null);

    return mCursor;
}

public Cursor getFlightByFlightNumber(String fn)
{
    if(fn.equals(""))
        fn = "0";

    Cursor mCursor = myDataBase.query("Inventory_Flight_Schedule", new String[] {
            "PK_Inventory_Flight_Schedule", "Flight_Number", "AC_Type", "Time", "Origin", "Destination"
    }, "Flight_Number = " + fn, null, null, null, null);

    return mCursor;
}

public Cursor getProductsOnFlight(int pk)
{       
    Cursor mCursor = myDataBase.query("Inventory_Scheduled", new String[] {
            "PK_Product_ID", "Quantity"
    }, "PK_Inventory_Flight_Schedule = " + pk, null, null, null, null);

    return mCursor;
}

public String getProductCategory(int pk)
{       
    String c = "";
    Cursor mCursor = myDataBase.query("Product_Category_Assigned", new String[] {
            "PK_Product_ID", "PK_Category_ID"
    }, "PK_Product_ID = " + pk, null, null, null, null);

    while (mCursor.moveToNext()) 
    {
        c = c + " " + mCursor.getString(mCursor.getColumnIndex("Category_Name"));
    }

    return c;
}

public Cursor getProductDetailsByProductID(int pID)
{
    Cursor mCursor = myDataBase.query("Products", new String[] {
            "Product_Description", "Product_Name", "Price", "ImageUri"
    }, "PK_Product_ID = " + pID, null, null, null, null);

    return mCursor;
}

public ArrayList<Product> getProductSalesDetail(int pkss)
{
    ArrayList<Product> productSales = new ArrayList<Product>();
    Product temp;

    Cursor p = myDataBase.query("Sales_Details", new String[] {
            "PK_Product_ID", "Quantity"
    }, "PK_Sales_Summary = " + pkss, null, null, null, null);

    while(p.moveToNext())
    {
        int pkproduct = Integer.parseInt(p.getString(p.getColumnIndex("PK_Product_ID")));
        Cursor product = getProductDetailsByProductID(pkproduct);
        product.moveToFirst();

        temp = new Product();
        temp.PK_Product_ID = pkproduct;
        temp.QuantityInCart = Integer.parseInt(p.getString(p.getColumnIndex("Quantity")));

        temp.Product_Name = product.getString(product.getColumnIndex("Product_Name"));
        temp.Price = product.getDouble(product.getColumnIndex("Price"));
        temp.ImageUri = product.getString(product.getColumnIndex("ImageUri"));
        productSales.add(temp);
    }

    return productSales;
}

public ArrayList<Product> getProductSales(ArrayList<Integer> pkss)
{
    ArrayList<Product> productSales = new ArrayList<Product>();


    for(int pk: pkss)
    {
        Cursor p = myDataBase.query("Sales_Details", new String[] {
                "PK_Product_ID", "Quantity"
        }, "PK_Sales_Summary = " + pk, null, null, null, null);

        while(p.moveToNext())
        {
            int pkproduct = Integer.parseInt(p.getString(p.getColumnIndex("PK_Product_ID")));
            Cursor product = getProductDetailsByProductID(pkproduct);
            product.moveToFirst();
            Product temp;

            if(productSales.isEmpty())
            {
                temp = new Product();
                temp.PK_Product_ID = pkproduct;
                temp.Quantity = Integer.parseInt(p.getString(p.getColumnIndex("Quantity")));

                temp.Product_Name = product.getString(product.getColumnIndex("Product_Name"));
                temp.Price = product.getDouble(product.getColumnIndex("Price"));
                temp.ImageUri = product.getString(product.getColumnIndex("ImageUri"));
                productSales.add(temp);
            }
            else   //if product list is not empty
            {
                temp = new Product();
                boolean inList = false;
                for(Product pp: productSales)
                {
                    if(pp.PK_Product_ID == pkproduct)
                    {
                        inList = true;
                        temp.Quantity = temp.Quantity + Integer.parseInt(p.getString(p.getColumnIndex("Quantity")));
                        break;
                    }
                }   

                if(!inList)
                {
                    temp.PK_Product_ID = pkproduct;
                    temp.Quantity = Integer.parseInt(p.getString(p.getColumnIndex("Quantity")));
                    temp.Product_Name = product.getString(product.getColumnIndex("Product_Name"));
                    temp.Price = product.getDouble(product.getColumnIndex("Price"));
                    temp.ImageUri = product.getString(product.getColumnIndex("ImageUri"));
                    productSales.add(temp);
                }
                else
                {
                    for(int i = 0; i < productSales.size(); i++)
                    {
                        Product pp = productSales.get(i);
                        if(pp.PK_Product_ID == pkproduct)
                        {
                            productSales.get(i).Quantity = productSales.get(i).Quantity + Integer.parseInt(p.getString(p.getColumnIndex("Quantity")));
                        }
                    }
                }
            }

        }
    }

    return productSales;
}

public ArrayList<SalesTransaction> getSalesData(int FlightNumber, String currentDate)
{

    Cursor salesData;
    ArrayList<Integer> pkflights = new ArrayList<Integer>();
    ArrayList<SalesTransaction> st = new ArrayList<SalesTransaction>();
    currentDate = currentDate.trim();
    String select = "Select PK_Flight_Selected From Flight_Selected Where Flight_Number = '" + FlightNumber + "'";
    Cursor mCursor = myDataBase.rawQuery(select, null);

            /*myDataBase.query("Flight_Selected", new String[] {
            "PK_Flight_Selected"
    }, "Flight_Number = " + FlightNumber + " AND Flight_Date = '" + currentDate + "'", null, null, null, null);
    */
    while (mCursor.moveToNext()) 
    {
        pkflights.add(Integer.parseInt(mCursor.getString(mCursor.getColumnIndex("PK_Flight_Selected"))));
    }

    for(int i: pkflights)
    {
        salesData = myDataBase.query("Sales_Summary", new String[] {
                "PK_Sales_Summary", "PK_Flight_Selected", "Employee_ID", "Total_Items", "Total_Amount"
        }, "PK_Flight_Selected = " + i , null, null, null, null);

        while(salesData.moveToNext())
        {
            SalesTransaction temp = new SalesTransaction();
            temp.PK_Sales_Summary = Integer.parseInt(salesData.getString(salesData.getColumnIndex("PK_Sales_Summary")));
            temp.PK_Flight_Selected = Integer.parseInt(salesData.getString(salesData.getColumnIndex("PK_Flight_Selected")));
            temp.EmployeeID = salesData.getString(salesData.getColumnIndex("Employee_ID"));
            temp.items = Integer.parseInt(salesData.getString(salesData.getColumnIndex("Total_Items")));
            temp.amount = Double.parseDouble(salesData.getString(salesData.getColumnIndex("Total_Amount")));

            Cursor salest = myDataBase.query("Sales_Transactions", new String[] {
                    "PK_Sales_Transaction", "CC_Name"
            }, "PK_Sales_Summary = " + temp.PK_Sales_Summary, null, null, null, null);

            while(salest.moveToNext())
            {
                temp.PK_Sales_Transaction = Integer.parseInt(salest.getString(salest.getColumnIndex("PK_Sales_Transaction")));
                temp.CC_Name = salest.getString(salest.getColumnIndex("CC_Name"));
            }

            st.add(temp);
        }
    }

    return st;
}

public long insertFlightSelectedRecord(int airline_ID, int flight_Number, String o, String d, String fd, String ac)
{
    ContentValues cv = new ContentValues();
    cv.put("Airline_ID", airline_ID);
    cv.put("Flight_Number", flight_Number);
    cv.put("Origin", o);
    cv.put("Dest", d);
    cv.put("Flight_Date", fd.toString());
    cv.put("AC_Type", ac);

    return myDataBase.insert("Flight_Selected", null, cv);
}

public long insertLoginLogInfo(String e, int device)
{

    Date date = new Date();
    ContentValues cv = new ContentValues();
    cv.put("Employee_ID", e);
    cv.put("Login_TimeStamp", date.toString());
    cv.put("Device_ID", device);

    return myDataBase.insert("FA_Login_Log", null, cv);
}

public long insertSalesSummary(int pk_flight, String EmployeeID, double total_items, double Amount)
{
    ContentValues cv = new ContentValues();
    cv.put("PK_Flight_Selected", pk_flight);
    cv.put("Employee_ID", EmployeeID);
    cv.put("Total_Items", total_items);
    cv.put("Total_Amount", Amount);

    return myDataBase.insert("Sales_Summary", null, cv);
}

public long insertSalesDetails(int pk_salessummary, int pID, int q)
{
    ContentValues cv = new ContentValues();
    cv.put("PK_Sales_Summary", pk_salessummary);
    cv.put("PK_Product_ID", pID);
    cv.put("Quantity", q);

    return myDataBase.insert("Sales_Details", null, cv);
}

public long insertSalesTransaction(int pkss, double amount, String cctype, String ccnumber, int cccode, String ccName)
{
    ContentValues cv = new ContentValues();
    cv.put("PK_Sales_Summary", pkss);
    cv.put("Amount", amount);
    cv.put("CC_Type", cctype);
    cv.put("CC_Number", ccnumber);
    cv.put("CC_Code", cccode);
    cv.put("CC_Name", ccName);

    return myDataBase.insert("Sales_Transactions", null, cv);
}

public boolean updateLoginLog(int pk, int pkflight)
{
    ContentValues cv = new ContentValues();
    cv.put("PK_Flight_Selected", pkflight);
    return myDataBase.update("FA_Login_Log", cv, "PK_FA_Login_Log = " + pk, null) > 0;
}

    }

Ошибка, похоже, происходит в методе getAirportCode в POSContext.

Любая помощь была бы высоко оценена. Благодарю!

РЕДАКТИРОВАТЬ:

после дальнейшей отладки я установил Catlog, и это ошибка в реальном времени:

    03-23 12:34:12.468 I/ActivityManager(1296): Start proc com.maziz.POS for activity com.maziz.POS/.Login: pid=6250 uid=10051 gids={3003}
    03-23 12:34:12.546 I/Database(6250): sqlite returned: error code = 0, msg = Recovered 3 frames from WAL file /data/data/com.maziz.POS/databases/AndroidPOS.sqlite-wal
    03-23 12:34:12.546 E/Database(6250): sqlite_prepare_v2(handle, "pragma journal_mode=WAL;") failed for "/data/data/com.maziz.POS/databases/AndroidPOS.sqlite"
    03-23 12:34:12.554 E/Database(6250):    at com.maziz.POS.POSContext.openDataBase(POSContext.java:135)
    03-23 12:34:12.554 E/Database(6250):    at com.maziz.POS.GlobalVars.onCreate(GlobalVars.java:32)
    03-23 12:34:12.562 W/System.err(6250):  at com.maziz.POS.POSContext.openDataBase(POSContext.java:135)
    03-23 12:34:12.562 W/System.err(6250):  at com.maziz.POS.GlobalVars.onCreate(GlobalVars.java:32)
    03-23 12:34:12.625 D/BugSenseHandler(6250): Looking for exceptions in: /data/data/com.maziz.POS/files
    03-23 12:34:12.656 D/BugSenseHandler(6250): Transmitting stack trace: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.maziz.POS/com.maziz.POS.Login}: java.lang.NullPointerException
    03-23 12:34:12.656 D/BugSenseHandler(6250):     at com.maziz.POS.POSContext.getAirportCodes(POSContext.java:178)
    03-23 12:34:12.656 D/BugSenseHandler(6250):     at com.maziz.POS.Login.onCreate(Login.java:29)
    03-23 12:34:14.648 D/BugSenseHandler(6250): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.maziz.POS/com.maziz.POS.Login}: java.lang.NullPointerException
    03-23 12:34:14.648 D/BugSenseHandler(6250):     at com.maziz.POS.POSContext.getAirportCodes(POSContext.java:178)
    03-23 12:34:14.648 D/BugSenseHandler(6250):     at com.maziz.POS.Login.onCreate(Login.java:29)
    03-23 12:34:14.648 E/AndroidRuntime(6250): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.maziz.POS/com.maziz.POS.Login}: java.lang.NullPointerException
    03-23 12:34:14.648 E/AndroidRuntime(6250):      at com.maziz.POS.POSContext.getAirportCodes(POSContext.java:178)
    03-23 12:34:14.648 E/AndroidRuntime(6250):      at com.maziz.POS.Login.onCreate(Login.java:29)
    03-23 12:34:15.492 W/ActivityManager(1296):   Force finishing activity com.maziz.POS/.Login
    03-23 12:34:16.000 W/ActivityManager(1296): Activity pause timeout for HistoryRecord{407109b8 com.maziz.POS/.Login}
    03-23 12:34:17.320 I/ActivityManager(1296): Process com.maziz.POS (pid 6250) has died.
    03-23 12:34:17.718 E/AnrParser(1432): Deleted file/data/anr/anrlogs/ANR_com.maziz.POS_20120323-123414.log
    03-23 12:34:17.718 E/AnrParser(1432): Deleted file/data/anr/anrlogs/com.maziz.POS-logcat.log
    03-23 12:34:26.148 W/ActivityManager(1296): Activity destroy timeout for HistoryRecord{407109b8 com.maziz.POS/.Login}