editText field is required before moving on to another Activity

Question

I have validation for editText. If the editText field is empty it should fail validation and stop the user moving on to another Activity,

Answer 1

You can also try this:

 if ( ( userName.getText().toString().trim().equals("")) ) 
 {
      Toast.makeText(getApplicationContext(), "User name is empty", Toast.LENGTH_SHORT).show();
 }
 else
 {
      Intent i = new Intent(getApplicationContext(), Login.class);
      startActivity(i);
 }