Question

i have created a login page when i enter username and password(if both are equal) it is used to login but the username and password are left blank and when i click on login button on emulator its shows the login succesful
it should not login when the username and password are left balnk

 @Override
         public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);

     txtUserName=(EditText)this.findViewById(R.id.txtUname);
     txtPassword=(EditText)this.findViewById(R.id.txtPwd);
     btnLogin=(Button)this.findViewById(R.id.btnLogin);
     btnLogin.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {            

                    if((txtUserName.getText().toString()).equals(txtPassword.getText().toString())){
                    Intent myIntent = new Intent(v.getContext(), SaveData.class);
                    startActivityForResult(myIntent, 1);
                    Toast.makeText(LoginappActivity.this, "Login Successful",Toast.LENGTH_LONG).show();
                    } else{
                    Toast.makeText(LoginappActivity.this, "Invalid Login",Toast.LENGTH_LONG).show(); 
                    }
               }
           });
 }           
       }

Answer 1

Just add condition txtUserName.getText().toString().length() > 0 with && operator in if

if((txtUserName.getText().toString().length() > 0) && (txtUserName.getText().toString()).equals(txtPassword.getText().toString())){
       Intent myIntent = new Intent(v.getContext(), SaveData.class);
       startActivityForResult(myIntent, 1);
       Toast.makeText(LoginappActivity.this, "Login Successful",Toast.LENGTH_LONG).show();
       } else{
          Toast.makeText(LoginappActivity.this, "Invalid Login",Toast.LENGTH_LONG).show(); 
          }
     }