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- E/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
- public class LoginDB extends SQLiteOpenHelper {
- //Table attributes
- public static final String DATABASE_NAME = "logindata.db";
- public static final int DATABASE_VERSION = 1;
- public static final String TABLE_NAME_INFOTABLE = "credentials";
- // Data attributes
- public static final String COLUMN_NAME_USERNAME = "username";
- public static final String COLUMN_NAME_PASSWORD = "password";
- private SQLiteOpenHelper DBHelper;
- private SQLiteDatabase db;
- public LoginDB(Context context) {
- super(context, DATABASE_NAME, null, DATABASE_VERSION);
- // TODO Auto-generated constructor stub
- }
- @Override
- public void onCreate(SQLiteDatabase db) {
- // TODO Auto-generated method stub
- String sqlDataStore = "create table if not exists " +
- DATABASE_NAME + " ("+ BaseColumns._ID + " integer primary key autoincrement,"
- + COLUMN_NAME_USERNAME + " text not null,"
- + COLUMN_NAME_PASSWORD + " text not null);";
- db.execSQL(sqlDataStore);
- }
- @Override
- public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
- // TODO Auto-generated method stub
- if(oldVersion == 1 && newVersion == 2){
- //Upgrade the database
- }
- }
- public boolean Login(String username, String password) throws SQLException
- {
- Cursor mCursor = db.rawQuery("SELECT * FROM " + DATABASE_NAME + " WHERE username=? AND password=?",
- new String[]{username,password});
- if(mCursor !=null) {
- if(mCursor.getCount()>0)
- {
- return true;
- }
- }
- return false;
- }
- public void open() {
- // TODO Auto-generated method stub
- db = DBHelper.getWritableDatabase();
- }
- public void close() {
- DBHelper.close();
- }
- }
- public class CredentialsActivity extends Activity implements OnClickListener{
- private Button lReg;
- private EditText lUname;
- private EditText lPword;
- private LoginDB loginDb = new LoginDB(CredentialsActivity.this);
- @Override
- protected void onCreate (Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.register);
- lReg = (Button)findViewById(R.id.reg_button);
- lReg.setOnClickListener(this);
- }
- public void onClick(View v) {
- switch(v.getId()) {
- case R.id.reg_button:
- lUname = (EditText)findViewById(R.id.reg_uname);
- lPword = (EditText)findViewById(R.id.reg_pswd);
- String uname = lUname.getText().toString();
- String pass = lPword.getText().toString();
- boolean invalid = false;
- if(uname.equals("")){
- invalid = true;
- Toast.makeText(getApplicationContext(), "Username Missing", Toast.LENGTH_SHORT).show();
- }else if(pass.equals("")){
- invalid = true;
- Toast.makeText(getApplicationContext(), "Password Missing", Toast.LENGTH_SHORT).show();
- }
- if(invalid == false){
- addEntry(uname, pass);
- Intent i_register = new Intent(CredentialsActivity.this, LoginDB.class);
- startActivity(i_register);
- finish();
- }}
- }
- public void onDestroy() {
- super.onDestroy();
- loginDb.close();
- }
- public void addEntry(String uname, String pass){
- SQLiteDatabase db = loginDb.getWritableDatabase();
- ContentValues values = new ContentValues();
- values.put("username", uname);
- values.put("password", pass);
- try{
- db.insert(LoginDB.DATABASE_NAME, null, values);
- Toast.makeText(getApplicationContext(), "Saved! Please login now", Toast.LENGTH_SHORT).show();
- }catch(Exception err){
- err.printStackTrace();
- }
- }
- }
- private LoginDB loginDb = new LoginDB(CredentialsActivity.this);
- private LoginDB loginDb;
- void onCreate(Bundle savedInstanceState)
- {
- super.onCreate(savedInstanceState);
- loginDb = new LoginDB(CredentialsActivity.this);
- ...
- }
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