Sample code of application of Kotlin string operation in Android development

Example of application of Kotlin string operation in Android development

introduction

In Android development, Kotlin has become a mainstream programming language, and it provides many convenient string manipulation functions. This article will combine a specific Kotlin sample program to introduce in detail how to create, format and use strings in Kotlin.

Sample code

Here is the sample code:

private fun printStr() {
    // Multi-line string    val str: String = """
         Hello, this is a string for a newline
     """.trimIndent()
    ("Tag", "printStr:" + str);
    // Single line string    val str1: String = "Hello, this is a single line string".trimIndent()
    ("Tag", "printStr:" + str1);
    // String interpolation    val content = "word";
    val cs = "hello $content"
    ("Tag", "cs:" + cs);
    // Get the string length    val testStr: String = "Hello word!";
    ("Tag", "$testStr length is ${}");
    // String containing special characters    val price = """
        ${'$'}9.99
    """.trimIndent();
    ("Tag", "price:"+price);
}

Detailed code explanation

Multi-line string

val str: String = """
     Hello, this is a string for a newline
 """.trimIndent()

In Kotlin, three quotes can be used"""to create multi-line strings.trimIndent()The method is used to remove indentation at the beginning of a string to ensure that the string is output correctly.

Single-line string

val str1: String = "Hello, this is a single line string".trimIndent()

Single-line strings use normal quotes""to create. same,trimIndent()Methods can be used to handle possible indentation.

String interpolation

val content = "word";
val cs = "hello $content"

Kotlin supports string interpolation, that is, it is used in strings.$Symbols to reference variables. This allows you to easily insert the value of the variable into the string, avoiding cumbersome string splicing.

Get the string length

val testStr: String = "Hello word!";
("Tag", "$testStr length is ${}");

pass${}Syntax, you can call an object's method in string interpolation. Called herelengthMethod to get the length of the string.

A string containing special characters

val price = """
    ${'$'}9.99
""".trimIndent();

If the string needs to contain special characters, such as$, can be used${'$'}Come escape. This ensures that special characters are displayed correctly.

Summarize

Through this example program, we have learned a variety of operating methods of strings in Kotlin, including the creation of multi-line strings, string interpolation, obtaining string lengths, and processing special characters. These functions make Kotlin more concise and efficient when processing strings, bringing great convenience to Android development. I hope this article can help you better understand the application of Kotlin string operation in Android development.

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