выполнения Исключение в Android SQLite OnCreate

Question

Я просто пытаюсь сделать связь в моей Android App к базе данных и вставить некоторые значения в нем, но я получаю ошибки Runtime Exception:

06-12 01:02:47.847: E/AndroidRuntime(27848): FATAL EXCEPTION: main 
06-12 01:02:47.847: E/AndroidRuntime(27848): Process: com.example.database,PID: 27848 
06-12 01:02:47.847: E/AndroidRuntime(27848): java.lang.NullPointerException 
06-12 01:02:47.847: E/AndroidRuntime(27848): at com.example.database.DataBaseManager.onCreate(DataBaseManager.java:38) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at com.example.database.MainActivity$1.onClick(MainActivity.java:31) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at android.view.View.performClick(View.java:4640) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at android.view.View$PerformClick.run(View.java:19421) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at android.os.Handler.handleCallback(Handler.java:733) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at android.os.Handler.dispatchMessage(Handler.java:95) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at android.os.Looper.loop(Looper.java:146) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at android.app.ActivityThread.main(ActivityThread.java:5602) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at java.lang.reflect.Method.invokeNative(Native Method) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at java.lang.reflect.Method.invoke(Method.java:515) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
06-12 01:02:47.847: E/AndroidRuntime(27848): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 

DataBaseManager:

public class DataBaseManager extends SQLiteOpenHelper { 

public static String DATABASE_NAME="First DB"; 
public static String TABLE_NAME="First table"; 
public static String COL_FNAME="fname"; 
public static String COL_LNAME="lname"; 
public static final String COLUMN_ID = "_id"; 
private static final String DATABASE_CREATE = "create table First DB"+ "(" + COLUMN_ID + " integer primary key autoincrement, " + COL_FNAME+ " text ,"+COL_LNAME+"text);"; 
SQLiteDatabase db; 

private static final String DATABASE_CREATE = “create table “ DATABASE_TABLE+ “ (“ + KEY_ID +“ integer primary key autoincrement, “ +KEY_NAME + “ text not null);”;*/ 


public DataBaseManager(Context context) { 
super(context, DATABASE_NAME, null, 1); 
// TODO Auto-generated constructor stub 
} 

@Override 
public void onCreate(SQLiteDatabase arg0) { 
// TODO Auto-generated method stub 
db.execSQL("create table First DB " + 
"(id integer primary key, fname text,lname text)" 
); 
} 

@Override 
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) { 
// TODO Auto-generated method stub 
db.execSQL("DROP TABLE IF EXISTS "+DATABASE_NAME); 
onCreate(db); 

} 
public void insert(SQLiteDatabase ddb,String fname,String lname) 
{ 

ddb.execSQL("insert into  " +DATABASE_NAME+"values(null,'"+fname+"','"+lname+"');"); 
} 

public void readData() { 


// TODO Auto-generated method stub 
SQLiteDatabase db=this.getReadableDatabase(); 
Cursor res=db.rawQuery("select * from"+DATABASE_NAME+";",null); 
int rows=res.getCount(); 
Toast.makeText(null,"now of rows are "+rows+"tillnow", Toast.LENGTH_LONG).show(); 

} 

MainActivity:

public class MainActivity extends ActionBarActivity { 
    Button insert,read; 
    DataBaseManager dbm; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    insert=(Button)findViewById(R.id.insert); 
    read=(Button)findViewById(R.id.read); 
    dbm=new DataBaseManager(this); 
    //getWritableDatabase(); 
    insert.setOnClickListener(new OnClickListener() { 

    @Override 
    public void onClick(View arg0) { 
    // TODO Auto-generated method stub 
    SQLiteDatabase db= 
    dbm.getWritableDatabase(); 
    dbm.insert(db,"nikhil", "saxena"); 
    dbm.insert(db,"rahul", "saxena"); 
    dbm.insert(db,"rahul", "dhillon"); 
    dbm.insert(db,"nikhil", "dhillon"); 
    } 
}); 

Просьба предложить.

Answer 1

изменение arg0 to db.

@Override 
public void onCreate(SQLiteDatabase db) { 
// TODO Auto-generated method stub 
db.execSQL("create table First DB " + 
"(id integer primary key, fname text,lname text)" 
); 
}