How to determine if an input in EditText is an integer?

Update:

You can control the EditText to only accept numbers

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

or check it programmatically

In Kotlin

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

---

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");
}

Since API level 1, Android provides an helper method to do just that (no need to use regex or catching exception) : TextUtils.isDigitsOnly(CharSequence str)

boolean digitsOnly = TextUtils.isDigitsOnly(editText.getText());

Note that this method returns true with empty String : Issue 24965