Restart class

I have to check the consistency of some fields in my application, but I can not get the process to stop for the user to enter the correct information. The way I put it, the error message is displayed but processing continues, see the commands below. What should I do?

    InputMethodManager imm = (InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE);
    if (rendim.getText().toString().isEmpty())
    {
        rendim.setError("Preencha o salário");
        rendim.requestFocus();
        imm.showSoftInput(rendim, InputMethodManager.SHOW_IMPLICIT);
    }
    else
    {
        objVal_or = new Val_or();
        rendimento = objVal_or.va_lor(rendim.getText().toString());
        if (rendimento <= 0)
        {
            rendim.setError("Salário zerado");
            rendim.requestFocus();
            imm.showSoftInput(rendim, InputMethodManager.SHOW_IMPLICIT);
        }
    }