kotlin delay
The delay
function in Kotlin is used to suspend the execution of a coroutine for a specific amount of time. It is part of the Kotlin Coroutines library, which provides a way to write asynchronous, non-blocking code in a more sequential and easy-to-read manner.
Here are the steps involved in using the delay
function:
- Import the necessary packages: To use the
delay
function, you need to import thekotlinx.coroutines
package. You can do this by adding the following line at the beginning of your Kotlin file:
kotlin
import kotlinx.coroutines.delay
- Use the
delay
function: Once you have imported thedelay
function, you can use it to suspend the execution of a coroutine. Thedelay
function takes a single parameter, which specifies the amount of time to delay in milliseconds. For example, to delay the execution for 1 second, you can use the following code:
kotlin
delay(1000)
This code will pause the execution of the coroutine for 1 second. After the delay, the coroutine will resume execution from where it left off.
- Handle coroutine cancellation: When using the
delay
function, it's important to handle the possibility of the coroutine being cancelled before the delay is completed. Coroutines can be cancelled using thecancel
function or by throwing aCancellationException
. To handle cancellation, you can wrap thedelay
function call in a try-catch block and catch theCancellationException
. For example:
kotlin
try {
delay(1000)
// Code to be executed after the delay
} catch (e: CancellationException) {
// Handle cancellation
}
By handling cancellation, you can ensure that your coroutine behaves correctly even if it is cancelled before the delay is finished.
That's it! By following these steps, you can use the delay
function in Kotlin to suspend the execution of coroutines for a specific amount of time.