我开始做一个简单的Android应用程序来练习使用Kotlin编程语言来计算年龄,错误来自34
行,有人可以帮我解决这个问题,并知道我的错误在哪里,因为我只是一个初学者
package com.calcult.age.agecalcult
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*
import java.util.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var my_age_number = ageText.text!!
var my_month_number = ageText2.text!!
var my_day_number = ageText3.text!!
var calcult_age_button = doIT
calcult_age_button.setOnClickListener {
if(my_age_number.isEmpty()){
Toast.makeText(this,"ادخل سنه ميلادك !",Toast.LENGTH_LONG).show()
}else if (my_age_number.length < 4 || my_age_number.length > 4){
Toast.makeText(this,"ادخل سنه ميلاديه صالحه الأستعمال !",Toast.LENGTH_LONG).show()
}else if (my_age_number.length == 4){
fun getAge(){
val get_the_year = Calendar.getInstance().get(Calendar.YEAR);
val calculat_the_age = my_age_number - get_the_year
}
}
}
}
}
答案 0 :(得分:0)
my_age_number
是一个字符串值,因此您应该尝试
var calculat_the_age: Int? = null
try {
calculat_the_age = my_age_number.toInt() - Calendar.getInstance().get(Calendar.YEAR)
} catch (ex: NumberFormatException) {
// my_age_number not a number
}
希望这会有所帮助!