如何确定EditText中的输入是否为整数? [英] How to determine if an input in EditText is an integer?

问题描述

我是Android编程的新手.

Hi I'm a newbie in Android Programming.

我正在尝试构建一个包含edittext字段和button的活动.当用户输入整数时，该按钮将引导他们进入下一个活动.但是我不知道是否有一种方法可以检查用户输入的类型.

I'm trying to build an activity which includes an edittext field and a button. When user type in an integer, the button will lead them to the next activity. However I do not if there's a way to check the type of user's input.

有人可以帮助我吗?非常感谢！！

Anyone can help me? Thank you very much！

推荐答案

更新:

您可以控制EditText只接受数字

You can control the EditText to only accept numbers

<TextView 
.
.
.
android:inputType="number"
/>

或以编程方式检查

在科特林

val number = editText123.text.toString().toIntOrNull() 
val isInteger = number != null

---

在Java中

---

In Java

String text = editText123.getText().toString();
try {
   int num = Integer.parseInt(text);
   Log.i("",num+" is a number");
} catch (NumberFormatException e) {
   Log.i("",text+" is not a number");
}

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