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Jetpack Compose - Alert Dialogs

Bernat Borrás Paronella
・2 min read

Material Aalert Dialog

The code presented in this article is using compose rc01

Jetpack Compose brings us with a cool new UI toolkit, but some things are completely different from how we are used to it, one of these cases is AlertDialog a common component on any application.

Steps to display an AlertDialog on compose:

  • Create a state as a flag to check if we need to show the dialog or not.
var showDialog by remember { mutableStateOf(false) }
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You may need to import:
import androidx.compose.runtime.getValue
import androidx.compose.runtime.setValue

Basic AlertDialog:

if (showDialog) {
    AlertDialog(
        onDismissRequest = {  },
        title = {  },
        text = { },
        confirmButton = { },
        dismissButton = { },
    )
}
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Let's see what's each param of AlertDialog composable method:

    onDismissRequest = {  },
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Will be called when clicking outside of a dialog, here we must set showDialog to false to remove it from our stack.

    title = {  },
    text = {  },
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Add a Text to show a title and message of our AlertDialog

    confirmButton = { },
    dismissButton = { },
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Define a Button or TextButton and its Text to get actions like "Accept" or "Cancel"

When click on confirm or button we must set our showDialog to false also, to avoid showing the dialog on the next recomposition.

    onDismissRequest = { showDialog = false },
    confirmButton = { showDialog = false },
    dismissButton = { showDialog = false },
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Other dialogs

What if we want to display custom content, like a list of items to select one?

    text = { 
       LazyColumn {
          items(...) { item -> Text(text = item) }
       }
    },
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Use the text field of AlertDialog to display any content that is needed and handle the dialog in the same way of buttons: showDialog = false.

Hope you enjoyed the article!

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