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1E/AndroidRuntime(531): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.LoginScr.Example/com.LoginScr.Example.LoginDB}: java.lang.InstantiationException: can't instantiate class com.LoginScr.Example.LoginDB; no empty constructor
2	
3public class LoginDB extends SQLiteOpenHelper {
4
5//Table attributes
6public static final String DATABASE_NAME = "logindata.db";
7public static final int DATABASE_VERSION = 1;
8public static final String TABLE_NAME_INFOTABLE = "credentials";
9
10// Data attributes
11public static final String COLUMN_NAME_USERNAME = "username";
12public static final String COLUMN_NAME_PASSWORD = "password";
13
14private SQLiteOpenHelper DBHelper;
15private SQLiteDatabase db;
16
17
18
19public LoginDB(Context context) {
20        super(context, DATABASE_NAME, null, DATABASE_VERSION);
21        // TODO Auto-generated constructor stub
22    }
23
24    @Override
25    public void onCreate(SQLiteDatabase db) {
26        // TODO Auto-generated method stub      
27
28        String sqlDataStore = "create table if not exists " +
29        DATABASE_NAME + " ("+ BaseColumns._ID + " integer primary key autoincrement,"
30
31                    + COLUMN_NAME_USERNAME + " text not null,"
32                    + COLUMN_NAME_PASSWORD + " text not null);";
33
34        db.execSQL(sqlDataStore);
35    }
36
37    @Override
38    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
39        // TODO Auto-generated method stub
40        if(oldVersion == 1 && newVersion == 2){
41            //Upgrade the database
42    }   
43
44}
45
46    public boolean Login(String username, String password) throws SQLException
47    {
48        Cursor mCursor = db.rawQuery("SELECT * FROM " + DATABASE_NAME + " WHERE username=? AND password=?",
49                new String[]{username,password});
50        if(mCursor !=null) {
51            if(mCursor.getCount()>0)
52            {
53            return true;
54            }
55        }
56            return false;
57        }
58
59    public void open() {
60        // TODO Auto-generated method stub
61        db = DBHelper.getWritableDatabase();
62    }
63    public void close() {
64        DBHelper.close();
65    }
66     }
67	
68public class CredentialsActivity extends Activity implements OnClickListener{
69
70   private Button lReg;
71   private EditText lUname;
72   private EditText lPword;
73
74   private LoginDB loginDb = new LoginDB(CredentialsActivity.this);
75
76   @Override
77   protected void onCreate (Bundle savedInstanceState) {
78   // TODO Auto-generated method stub
79    super.onCreate(savedInstanceState);
80   setContentView(R.layout.register);
81
82   lReg = (Button)findViewById(R.id.reg_button);
83   lReg.setOnClickListener(this);
84   }
85
86  public void onClick(View v) {
87
88switch(v.getId()) {
89
90case R.id.reg_button:
91    lUname = (EditText)findViewById(R.id.reg_uname);
92    lPword = (EditText)findViewById(R.id.reg_pswd);
93
94    String uname = lUname.getText().toString();
95    String pass = lPword.getText().toString();
96    boolean invalid = false;
97
98    if(uname.equals("")){
99        invalid = true;
100        Toast.makeText(getApplicationContext(), "Username Missing", Toast.LENGTH_SHORT).show();
101    }else if(pass.equals("")){
102        invalid = true;
103        Toast.makeText(getApplicationContext(), "Password Missing", Toast.LENGTH_SHORT).show();
104    }
105    if(invalid == false){
106        addEntry(uname, pass);
107        Intent i_register = new Intent(CredentialsActivity.this, LoginDB.class);
108        startActivity(i_register);
109        finish();
110}}
111}
112    public void onDestroy() {
113        super.onDestroy();
114        loginDb.close();
115    }
116
117     public void addEntry(String uname, String pass){
118
119     SQLiteDatabase db = loginDb.getWritableDatabase();
120     ContentValues values = new ContentValues();
121     values.put("username", uname);
122     values.put("password", pass);
123
124     try{
125         db.insert(LoginDB.DATABASE_NAME, null, values);
126         Toast.makeText(getApplicationContext(), "Saved! Please login now",            Toast.LENGTH_SHORT).show();
127         }catch(Exception err){
128      err.printStackTrace();
129     }
130    }
131   }
132	
133private LoginDB loginDb = new LoginDB(CredentialsActivity.this);
134	
135private LoginDB loginDb;
136void onCreate(Bundle savedInstanceState)
137{
138  super.onCreate(savedInstanceState);
139  loginDb = new LoginDB(CredentialsActivity.this);
140...
141}