Add snippets for /training/wearables/tiles/debug (#694)

* Add snippets for /training/wearables/tiles/debug

* Create dynamic preview

* Suppress lint warnings for code sample

Author: ithinkihaveacat

wear/src/main/java/com/example/wear/snippets/tile/Preview.kt

@@ -0,0 +1,125 @@
+/*
+ * 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.
+ */
+
+@file:Suppress("MissingPermission")
+
+package com.example.wear.snippets.tile
+
+import android.content.Context
+import androidx.annotation.DrawableRes
+import androidx.wear.protolayout.DeviceParametersBuilders.DeviceParameters
+import androidx.wear.protolayout.ResourceBuilders
+import androidx.wear.protolayout.material3.materialScope
+import androidx.wear.protolayout.material3.primaryLayout
+import androidx.wear.protolayout.material3.text
+import androidx.wear.protolayout.types.stringLayoutConstraint
+import androidx.wear.tiles.tooling.preview.Preview
+import androidx.wear.tiles.tooling.preview.TilePreviewData
+import androidx.wear.tiles.tooling.preview.TilePreviewHelper
+import androidx.wear.tooling.preview.devices.WearDevices
+import androidx.wear.protolayout.ResourceBuilders.Resources
+import androidx.wear.protolayout.expression.DynamicDataBuilders
+import androidx.wear.protolayout.expression.PlatformDataValues
+import androidx.wear.protolayout.expression.PlatformHealthSources
+import com.example.wear.R
+import androidx.wear.protolayout.types.layoutString
+import androidx.wear.protolayout.types.asLayoutString
+
+// [START android_wear_tile_preview_simple]
+@Preview(device = WearDevices.SMALL_ROUND)
+@Preview(device = WearDevices.LARGE_ROUND)
+fun tilePreview(context: Context) = TilePreviewData { request ->
+    TilePreviewHelper.singleTimelineEntryTileBuilder(
+        buildMyTileLayout(context, request.deviceConfiguration)
+    ).build()
+}
+// [END android_wear_tile_preview_simple]
+
+fun buildMyTileLayout(
+    context: Context,
+    deviceParameters: DeviceParameters,
+) = materialScope(context = context, deviceConfiguration = deviceParameters) {
+        primaryLayout(
+            mainSlot = {
+                text("Hello world!".layoutString)
+            }
+        )
+    }
+
+private const val RESOURCES_VERSION = "1"
+private const val myImageId = "myImageId"
+
+// [START android_wear_tile_preview_resources]
+@Preview(device = WearDevices.SMALL_ROUND)
+fun previewWithResources(context: Context) = TilePreviewData(
+    onTileResourceRequest = { request ->
+        Resources.Builder()
+            .setVersion(RESOURCES_VERSION)
+            .addIdToImageMapping(
+                myImageId,
+                getImageById(R.drawable.animated_walk)
+            )
+            .build()
+    },
+    onTileRequest = { request ->
+        TilePreviewHelper.singleTimelineEntryTileBuilder(
+            buildMyTileLayout(context, request.deviceConfiguration)
+        ).build()
+    }
+)
+// [END android_wear_tile_preview_resources]
+
+fun getImageById(
+    @DrawableRes id: Int,
+): ResourceBuilders.ImageResource =
+    ResourceBuilders.ImageResource.Builder()
+        .setAndroidResourceByResId(
+            ResourceBuilders.AndroidImageResourceByResId.Builder()
+                .setResourceId(id)
+                .build(),
+        )
+        .build()
+
+fun buildMyTileLayoutDynamic(
+    context: Context,
+    deviceParameters: DeviceParameters,
+) = materialScope(context = context, deviceConfiguration = deviceParameters) {
+    primaryLayout(
+        mainSlot = {
+            text(
+                text =
+                PlatformHealthSources.heartRateBpm()
+                    .format()
+                    .asLayoutString("--", stringLayoutConstraint("999"))
+            )
+        }
+    )
+}
+
+// [START android_wear_tile_preview_platform]
+@Preview(device = WearDevices.SMALL_ROUND)
+fun previewWithPlatformOverride(context: Context) = TilePreviewData(
+    platformDataValues = PlatformDataValues.of(
+        PlatformHealthSources.Keys.HEART_RATE_BPM,
+        DynamicDataBuilders.DynamicDataValue.fromFloat(160f)
+    ),
+    onTileRequest = { request ->
+        TilePreviewHelper.singleTimelineEntryTileBuilder(
+            buildMyTileLayoutDynamic(context, request.deviceConfiguration)
+        ).build()
+    }
+)
+// [END android_wear_tile_preview_platform]