Capitalize First Letter of String in Android - Kotlin & Java

If we have a String in Kotlin or in Java in Android and we need to capitalize the first letter of the string, we don’t have any built-in method for the purpose. You can use the following methods to capitalize the first letter of String in Android in both Java & Kotlin.

Capitalize First Letter of String in Java

public static String capitalizeString(String str) {
        String retStr = str;
        try { // We can face index out of bound exception if the string is null
            retStr = str.substring(0, 1).toUpperCase() + str.substring(1);
        }catch (Exception e){}
        return retStr;
}

Capitalize First Letter of String in Kotlin

fun capitalizeString(str: String): String {
        var retStr = str
        try { // We can face index out of bound exception if the string is null
            retStr = str.substring(0, 1).toUpperCase() + str.substring(1)
        } catch (e: Exception) {
        }
        return retStr
}

Just pass your String as a Parameter and retrieve the first letter capitalized String in java & Kotlin.

Capitalize Sentences in EditText While Taking Input

We can also capitalize sentences while taking input in EditText in android. But in this scenario user can still have a control to turn it back to a small letter from the soft keyboard. Anyhow you can set capitalize sentences by using textCapSentences input type in EditText in the following way.

<EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:hint="Enter Your Text"
        android:inputType="textCapSentences"/>

It shows capitalized sentences in the following way.