android: profile import as an Expressive bottom sheet in a transparent host

src/frontends/android/app/src/main/AndroidManifest.xml

@@ -149,7 +149,7 @@
         <activity
             android:name=".ui.VpnProfileImportActivity"
             android:label="@string/profile_import"
-            android:theme="@style/ApplicationTheme.ActionBar"
+            android:theme="@style/TransparentActivity"
             android:taskAffinity=""
             android:excludeFromRecents="true"
             android:exported="true">

src/frontends/android/app/src/main/java/org/strongswan/android/ui/compose/ImportScreen.kt

@@ -52,6 +52,8 @@ import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
+import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.rememberModalBottomSheetState
 import org.strongswan.android.R
 import org.strongswan.android.ui.compose.components.ShxCard
 import org.strongswan.android.ui.compose.theme.ShxSpacing
@@ -89,19 +91,28 @@ class ImportUiModel
 	var hideImport by mutableStateOf(false)
 }
 
-/** Renders the import screen in the transparent import activity. */
+/** Renders the import UI as a bottom sheet in the transparent import activity. */
+@OptIn(ExperimentalMaterial3Api::class)
 fun ComponentActivity.installImportScreen(model: ImportUiModel, onImport: Runnable, onClose: Runnable,
 										  onImportPkcs12: Runnable, onSelectUserCert: Runnable)
 {
 	setContent {
 		ShxTheme {
-			ImportScreen(
-				model = model,
-				onImport = onImport::run,
-				onClose = onClose::run,
-				onImportPkcs12 = onImportPkcs12::run,
-				onSelectUserCert = onSelectUserCert::run,
+			/* the activity is a transparent host: the import UI is an Expressive bottom sheet */
+			ModalBottomSheet(
+				onDismissRequest = onClose::run,
+				sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true),
+				containerColor = MaterialTheme.colorScheme.background,
 			)
+			{
+				ImportScreen(
+					model = model,
+					onImport = onImport::run,
+					onClose = onClose::run,
+					onImportPkcs12 = onImportPkcs12::run,
+					onSelectUserCert = onSelectUserCert::run,
+				)
+			}
 		}
 	}
 }