Fix background blur on Pixel 8

(and other devices (?))

Close #590

app/ui/src/main/java/de/mm20/launcher2/ui/launcher/helper/WallpaperBlur.kt

@@ -2,8 +2,11 @@ package de.mm20.launcher2.ui.launcher.helper
 
 import android.app.Activity
 import android.view.WindowManager
+import androidx.compose.animation.core.Animatable
+import androidx.compose.animation.core.VectorConverter
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.remember
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.unit.dp
@@ -11,19 +14,28 @@ import de.mm20.launcher2.ktx.isAtLeastApiLevel
 
 @Composable
 fun WallpaperBlur(blurRadius: () -> Int) {
+    if (!isAtLeastApiLevel(31)) return
     val context = LocalContext.current
     val density = LocalDensity.current
+
     val radius = blurRadius()
+    val animatable = remember { Animatable(radius, Int.VectorConverter) }
     LaunchedEffect(radius) {
-        if (!isAtLeastApiLevel(31)) return@LaunchedEffect
-        (context as Activity).window.attributes = context.window.attributes.also {
-            if (radius > 0) {
-                it.blurBehindRadius = with(density) { radius.dp.toPx().toInt() }
-                it.flags = it.flags or WindowManager.LayoutParams.FLAG_BLUR_BEHIND
+        animatable.animateTo(with(density) { radius.dp.toPx().toInt() }) {
+            if (value > 0) {
+                val windowAttributes = (context as Activity).window.attributes
+                windowAttributes.flags =
+                    windowAttributes.flags or WindowManager.LayoutParams.FLAG_BLUR_BEHIND
+                context.window.attributes = windowAttributes
+                context.window.setBackgroundBlurRadius(value)
             } else {
-                it.blurBehindRadius = 0
-                it.flags = it.flags and WindowManager.LayoutParams.FLAG_BLUR_BEHIND.inv()
+                val windowAttributes = (context as Activity).window.attributes
+                windowAttributes.flags =
+                    windowAttributes.flags and WindowManager.LayoutParams.FLAG_BLUR_BEHIND.inv()
+                context.window.attributes = windowAttributes
+                context.window.setBackgroundBlurRadius(0)
             }
         }
+
     }
 }

core/base/src/main/res/values/themes.xml

@@ -30,6 +30,7 @@
         <item name="windowActionBar">false</item>
         <item name="windowNoTitle">true</item>
         <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
+        <item name="android:windowIsTranslucent">true</item>
     </style>
 
     <style name="DialogTheme" parent="BaseTheme">