title: Android kotlin - app do not show me toast
body: <p>I want when someone insert more than 3 number in month input, the Toast should show a error message, I try it and the app do nothing! Why?(<em>I am beginner</em>)
  another question how can I use try and catch with that?</p>
  
  <pre><code>@SuppressLint("SetTextI18n")
  fun onClickButton(view: View){
  
      getAGE.setOnClickListener {
          val Get_year_input = age_year_input.text.toString().toInt()
          val getCurrentYear = Calendar.getInstance().get(Calendar.YEAR)
          val finish_year_input = Get_year_input - getCurrentYear
          val getCurrentMonth = Calendar.getInstance().get(Calendar.MONTH)
          val finish_month_input = age_month_input.text.toString().toInt()-getCurrentMonth
  
          if (age_month_input.length() &gt; 2) {                
              Toasty.error(this,"لقد أدخلت شهر غير صالح",Toast.LENGTH_LONG)  
          } else {
              ShowYearInput.text = " عُمرك الميلادي هو : $finish_year_input و $finish_month_input  أشهر "
          }
      }
  }
  </code></pre>