[Java for Android App Development] WaitTobi:
im having issues with my coding for an app im trying to develop and since im a noob i cant just identify errors i would like to post my logcat but cause of the errors it wont run .... my code is for a login and registration please just point out my errors im down to learn and understand whats going on ....

my login activity

public class LoginScreen extends Activity {

Button btnSignIn ;

TextView registerScreen;

LoginDataBaseAdapter loginDataBaseAdapter;

[MENTION=439709]override[/MENTION]

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

// setting default screen to login.xml

setContentView(R.layout.login);

TextView registerScreen = (TextView) findViewById(R.id.link_to_register);

// Listening to register new account link

registerScreen.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// Switching to Register screen

Intent i = new Intent(getApplicationContext(), SignUp.class);

startActivity(i);

// create a instance of SQLite Database

loginDataBaseAdapter = new LoginDataBaseAdapter(this);

loginDataBaseAdapter = loginDataBaseAdapter.open();

// Get The Reference Of Buttons

btnSignIn = (Button) findViewById(R.id.btnLogin);

}

// Methods to handleClick Event of Sign In Button

public void signIn(View V) {

try{

final Dialog dialog = new Dialog(LoginScreen.this);

dialog.setContentView(R.layout.login);

dialog.setTitle("Login");

// get the References of views

final EditText loginUsername = (EditText) dialog

.findViewById(R.id.liUsername);

final EditText loginPassword = (EditText) dialog

.findViewById(R.id.liPassword);

Button btnSignIn = (Button) dialog.findViewById(R.id.btnLogin);

}catch(Exception e){

Log.e("tag", e.getMessage());

}

// Set On ClickListener

btnSignIn.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// get The User name and Password

String username = loginUsername.getText().toString();

String password = loginPassword.getText().toString();

// fetch the Password form database for respective user name

String storedPassword = loginDataBaseAdapter

.getSingleEntry(username);

// check if the Stored password matches with Password entered by

// user

if (password.equals(storedPassword)) {

Toast.makeText(LoginScreen.this,

"Congrats: Login Successful", Toast.LENGTH_LONG)

.show();

dialog.dismiss();

} else {

Toast.makeText(LoginScreen.this,

"User Name or Password does not match",

Toast.LENGTH_LONG).show();

dialog.show();

}

}

[MENTION=439709]override[/MENTION]

public void startActivity(Intent intent) {

// TODO Auto-generated method stub

try{

super.startActivity(intent);

Intent mainpage = new Intent(LoginScreen.this, MainPage.class);

startActivity(mainpage);

finish();

}catch(Exception e){

Log.e("tag", e.getMessage());

}

}

[MENTION=439709]override[/MENTION]

protected void onDestroy() {

try{

super.onDestroy();

// Close The Database

loginDataBaseAdapter.close();

}catch(Exception e){

Log.e("onDestroy - Error", e.getMessage());

}	}

my registration activity

public class SignUp extends Activity {

EditText reg_fullname, reg_username, reg_email, reg_password, reg_confirmpassword;

Button btnRegister;

LoginDataBaseAdapter loginDataBaseAdapter;

[MENTION=439709]override[/MENTION]

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

// Set View to register.xml

setContentView(R.layout.signup);

TextView loginScreen = (TextView) findViewById(R.id.link_to_login);

// Listening to Login Screen link

loginScreen.setOnClickListener(new View.OnClickListener() {

public void onClick(View arg0) {

// Closing registration screen

// Switching to Login Screen/closing register screen

finish();

// get Instance of Database Adapter

loginDataBaseAdapter = new LoginDataBaseAdapter(this);

loginDataBaseAdapter = loginDataBaseAdapter.open();

// Get References of Views

reg_fullname = (EditText) findViewById(R.id.reg_fullname);

reg_username = (EditText) findViewById(R.id.reg_username);

reg_email = (EditText) findViewById(R.id.reg_email);

reg_password = (EditText) findViewById(R.id.reg_password);

reg_confirmpassword = (EditText) findViewById(R.id.reg_confirmpassword);

btnRegister = (Button) findViewById(R.id.btnRegister);

btnRegister.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// TODO Auto-generated method stub

String fullname = reg_fullname.getText().toString();

String username = reg_username.getText().toString();

String password = reg_password.getText().toString();

String email = reg_email.getText().toString();

String confirmPassword = reg_confirmpassword.getText()

.toString();

// check if any of the fields are vacant

if (username.equals("") || password.equals("")

|| confirmPassword.equals("")) {

Toast.makeText(getApplicationContext(), "Field Vaccant",

Toast.LENGTH_LONG).show();

return;

}

// check if both password matches

if (!password.equals(confirmPassword)) {

Toast.makeText(getApplicationContext(),

"Password does not match", Toast.LENGTH_LONG)

.show();

return;

} else {

// Save the Data in Database

loginDataBaseAdapter.insertEntry(username, password);

Toast.makeText(getApplicationContext(),

"Account Successfully Created ", Toast.LENGTH_LONG)

.show();

}

}

[MENTION=439709]override[/MENTION]

protected void onDestroy() {

// TODO Auto-generated method stub

try{

super.onDestroy();

loginDataBaseAdapter.close();

}catch(Exception e){

Log.e("onDestroy - Error", e.getMessage());

}}