无法显示来自 android 应用程序的 AlertDialog class

Question

I'm trying to display programmatically an AlertDialog from the Application class using the applicationContext. I'm using my own Theme that extends Theme.Material3.Light . Only Toast messages works fine. I'm getting this error:

java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

My application Theme is:

android:theme="@style/Theme.MyTheme"

MyTheme is defined as:

<style name="Theme.MyTheme" parent="Theme.Material3.Light">

I have also a custom style for AlertDialogs defined in MyTheme:

<!-- AlertDialog Style-->
<style name="AlertDialogTheme" parent="MaterialAlertDialog.Material3">
    <item name="android:background">@drawable/dialog_light</item>
</style>

The class from which I launch the event

class AppController: Application()

I tried changing the default theme in the Manifest and then setting the custom one programmatically when the application in launched but it did not work.

Answer 1

It seems like your activity extends from AppCompatActivity and your theme is from Activity.

In your style.xml you have to do something like this:

<style name="ActionBarAppCompatTheme" parent="Theme.AppCompat.Light.DarkActionBar">

Or you can just change AppCompatActivity to Activity in your class.

Hope it helps.