Main

    EditText mTextPassword;
    Button mButtonLogin;
    TextView mTextViewRegister;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

     mTextUsername =(EditText)findViewById(R.id.edittext_username);
     mTextPassword =(EditText)findViewById(R.id.edittext_password);
     mButtonLogin =(Button) findViewById(R.id.button_login);
     mTextViewRegister =(TextView)findViewById(R.id.textview_register);
     mTextViewRegister.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View view) {
             Intent registerIntent = new Intent (LoginActivity.this,Main2Activity.class);
             startActivity(registerIntent);
          }
     });
    }
}