Migrate last batch of XR snippets (#507)

* Migrate "Add 3D models to your app" to snippets

* Migrate "Check for spatial capabilities" to snippets

* Migrate "Transition from Home Space to Full Space" to snippets

Author: devbridie

xr/src/main/java/com/example/xr/compose/SpatialCapabilities.kt

@@ -17,7 +17,13 @@
 package com.example.xr.compose
 
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.unit.dp
 import androidx.xr.compose.platform.LocalSpatialCapabilities
+import androidx.xr.compose.spatial.Subspace
+import androidx.xr.compose.subspace.SpatialPanel
+import androidx.xr.compose.subspace.layout.SubspaceModifier
+import androidx.xr.compose.subspace.layout.fillMaxHeight
+import androidx.xr.compose.subspace.layout.width
 
 @Composable
 private fun SupportingInfoPanel() {}
@@ -38,3 +44,25 @@ private fun SpatialCapabilitiesCheck() {
     val spatialAudioEnabled = LocalSpatialCapabilities.current.isSpatialAudioEnabled
     // [END androidxr_compose_checkSpatialCapabilities]
 }
+
+@Composable
+private fun checkSpatialUiEnabled() {
+    // [START androidxr_compose_checkSpatialUiEnabled]
+    if (LocalSpatialCapabilities.current.isSpatialUiEnabled) {
+        Subspace {
+            SpatialPanel(
+                modifier = SubspaceModifier
+                    .width(1488.dp)
+                    .fillMaxHeight()
+            ) {
+                AppContent()
+            }
+        }
+    } else {
+        AppContent()
+    }
+    // [END androidxr_compose_checkSpatialUiEnabled]
+}
+
+@Composable
+private fun AppContent() {}

xr/src/main/java/com/example/xr/misc/ModeTransition.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.xr.misc
+
+import androidx.compose.runtime.Composable
+import androidx.xr.compose.platform.LocalSpatialConfiguration
+import androidx.xr.scenecore.Session
+
+@Composable
+fun modeTransitionCompose() {
+    // [START androidxr_misc_modeTransitionCompose]
+    LocalSpatialConfiguration.current.requestHomeSpaceMode()
+    // or
+    LocalSpatialConfiguration.current.requestFullSpaceMode()
+    // [END androidxr_misc_modeTransitionCompose]
+}
+
+fun modeTransitionScenecore(xrSession: Session) {
+    // [START androidxr_misc_modeTransitionScenecore]
+    xrSession.spatialEnvironment.requestHomeSpaceMode()
+    // [END androidxr_misc_modeTransitionScenecore]
+}

xr/src/main/java/com/example/xr/scenecore/GltfEntity.kt

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.xr.scenecore
+
+import android.content.Intent
+import android.net.Uri
+import androidx.activity.ComponentActivity
+import androidx.xr.scenecore.GltfModel
+import androidx.xr.scenecore.GltfModelEntity
+import androidx.xr.scenecore.Session
+import androidx.xr.scenecore.SpatialCapabilities
+import androidx.xr.scenecore.getSpatialCapabilities
+import kotlinx.coroutines.guava.await
+
+private suspend fun loadGltfFile(session: Session) {
+    // [START androidxr_scenecore_gltfmodel_create]
+    val gltfModel = GltfModel.create(session, "models/saturn_rings.glb").await()
+    // [END androidxr_scenecore_gltfmodel_create]
+}
+
+private fun createModelEntity(session: Session, gltfModel: GltfModel) {
+    // [START androidxr_scenecore_gltfmodelentity_create]
+    if (session.getSpatialCapabilities()
+        .hasCapability(SpatialCapabilities.SPATIAL_CAPABILITY_3D_CONTENT)
+    ) {
+        val gltfEntity = GltfModelEntity.create(session, gltfModel)
+    }
+    // [END androidxr_scenecore_gltfmodelentity_create]
+}
+
+private fun animateEntity(gltfEntity: GltfModelEntity) {
+    // [START androidxr_scenecore_gltfmodelentity_animation]
+    gltfEntity.startAnimation(loop = true, animationName = "Walk")
+    // [END androidxr_scenecore_gltfmodelentity_animation]
+}
+
+private fun ComponentActivity.startSceneViewer() {
+    // [START androidxr_scenecore_sceneviewer]
+    val url =
+        "https://raw.githubusercontent.com/KhronosGroup/glTF-Sample-Models/master/2.0/FlightHelmet/glTF/FlightHelmet.gltf"
+    val sceneViewerIntent = Intent(Intent.ACTION_VIEW)
+    val intentUri =
+        Uri.parse("https://arvr.google.com/scene-viewer/1.2")
+            .buildUpon()
+            .appendQueryParameter("file", url)
+            .build()
+    sceneViewerIntent.setDataAndType(intentUri, "model/gltf-binary")
+    startActivity(sceneViewerIntent)
+    // [END androidxr_scenecore_sceneviewer]
+}

xr/src/main/java/com/example/xr/scenecore/SpatialCapabilities.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.xr.scenecore
+
+import androidx.xr.scenecore.Session
+import androidx.xr.scenecore.SpatialCapabilities
+import androidx.xr.scenecore.getSpatialCapabilities
+
+fun checkMultipleCapabilities(xrSession: Session) {
+    // [START androidxr_compose_checkMultipleCapabilities]
+    // Example 1: check if enabling passthrough mode is allowed
+    if (xrSession.getSpatialCapabilities().hasCapability(
+            SpatialCapabilities.SPATIAL_CAPABILITY_PASSTHROUGH_CONTROL
+        )
+    ) {
+        xrSession.spatialEnvironment.setPassthroughOpacityPreference(0f)
+    }
+    // Example 2: multiple capability flags can be checked simultaneously:
+    if (xrSession.getSpatialCapabilities().hasCapability(
+            SpatialCapabilities.SPATIAL_CAPABILITY_PASSTHROUGH_CONTROL and
+                SpatialCapabilities.SPATIAL_CAPABILITY_3D_CONTENT
+        )
+    ) {
+        // ...
+    }
+    // [END androidxr_compose_checkMultipleCapabilities]
+}