Add mobile camera capture, polaroid preview, gallery save & native share

- カメラ撮影 → プレビュー(ポラロイド風白縁)→ 保存 / ネイティブ共有
- iOS / Android のネイティブ実装(共有・ギャラリー保存・FileProvider)
- iOS は共有シートのプリウォームで初回表示を軽減
- iOS Info.plist 用途説明をビルド後処理で自動付与
- Android パッケージ名ガードを有効化(ビルド前チェック)
- README を整備、.gitignore に slnx / .vscode / .utmp を追加

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/Editor/NativeSharePackageNameGuard.cs

@@ -0,0 +1,106 @@
+using System.IO;
+using UnityEditor;
+using UnityEditor.Build;
+using UnityEditor.Build.Reporting;
+using UnityEngine;
+
+public class NativeSharePackageNameGuard : IPreprocessBuildWithReport
+{
+    public int callbackOrder => 0;
+
+    private const string DefaultNativeSharePackageName = "jp.yourname.unity.nativeshare";
+
+    public void OnPreprocessBuild(BuildReport report)
+    {
+        if (report.summary.platform != BuildTarget.Android)
+        {
+            return;
+        }
+
+        CheckUnityAndroidPackageName();
+        CheckNativeSharePackageName();
+    }
+
+    private void CheckUnityAndroidPackageName()
+    {
+        string applicationId =
+            PlayerSettings.GetApplicationIdentifier(BuildTargetGroup.Android);
+
+        if (string.IsNullOrEmpty(applicationId))
+        {
+            throw new BuildFailedException(
+                "Android の Package Name が空です。\n\n" +
+                "Project Settings > Player > Android > Other Settings > Identification > Package Name に、" +
+                "自分のアプリ用の Package Name を設定してください。\n\n" +
+                "例:\n" +
+                "jp.piccolo.cameraapp"
+            );
+        }
+
+        if (
+            applicationId.StartsWith("com.DefaultCompany") ||
+            applicationId.Contains("DefaultCompany") ||
+            applicationId.Contains("ProductName")
+        )
+        {
+            throw new BuildFailedException(
+                "Android の Package Name が初期値のままです。\n\n" +
+                "Project Settings > Player > Android > Other Settings > Identification > Package Name を、" +
+                "自分のアプリ用のものへ変更してください。\n\n" +
+                "現在の値:\n" +
+                applicationId + "\n\n" +
+                "例:\n" +
+                "jp.piccolo.cameraapp"
+            );
+        }
+    }
+
+    private void CheckNativeSharePackageName()
+    {
+        string assetsPath = Application.dataPath;
+
+        string[] targetFiles =
+        {
+            Path.Combine(assetsPath, "Scripts/NativeShareBridge.cs"),
+            Path.Combine(assetsPath, "Plugins/Android/AndroidManifest.xml"),
+            Path.Combine(assetsPath, "Plugins/Android/jp/yourname/unity/nativeshare/NativeShareBridge.java"),
+            Path.Combine(assetsPath, "Plugins/Android/jp/yourname/unity/nativeshare/NativeShareFileProvider.java")
+        };
+
+        foreach (string filePath in targetFiles)
+        {
+            if (!File.Exists(filePath))
+            {
+                continue;
+            }
+
+            string text = File.ReadAllText(filePath);
+
+            if (text.Contains(DefaultNativeSharePackageName))
+            {
+                throw new BuildFailedException(
+                    "NativeShare の Android Java package 名が初期値のままです。\n\n" +
+                    "Android向けにビルドする前に、次の2種類の Package Name を確認してください。\n\n" +
+                    "1. Unity Player Settings の Package Name\n" +
+                    "   Project Settings > Player > Android > Other Settings > Identification > Package Name\n" +
+                    "   例: jp.piccolo.cameraapp\n\n" +
+                    "2. NativeShare 側の Java package 名\n" +
+                    "   次の仮パッケージ名を、自分のものへ変更してください。\n\n" +
+                    "   " + DefaultNativeSharePackageName + "\n\n" +
+                    "   例:\n" +
+                    "   jp.piccolo.unity.nativeshare\n" +
+                    "   jp.piccolo.cameraapp.nativeshare\n\n" +
+                    "変更が必要な主な箇所:\n" +
+                    "・NativeShareBridge.cs の AndroidJavaClass の文字列\n" +
+                    "・NativeShareBridge.java の package 行\n" +
+                    "・NativeShareFileProvider.java の package 行\n" +
+                    "・AndroidManifest.xml の provider android:name\n" +
+                    "・Android 側のフォルダ名\n\n" +
+                    "補足:\n" +
+                    "Unity Player Settings の Package Name と、NativeShare の Java package 名は、" +
+                    "同じである必要はありません。"
+                );
+            }
+        }
+    }
+}

Assets/Editor/NativeSharePackageNameGuard.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: eec2ec8e1aacf4a24a36d085eea4ae1f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData:
+  assetBundleName:
+  assetBundleVariant:

Assets/Editor/NativeSharePostProcessBuild.cs

@@ -0,0 +1,43 @@
+using UnityEditor;
+using UnityEditor.Callbacks;
+
+#if UNITY_IOS
+using UnityEditor.iOS.Xcode;
+#endif
+
+/// <summary>
+/// iOS ビルド後に Info.plist へ写真ライブラリ関連の用途説明を自動で追加する。
+/// これが無いと UIImageWriteToSavedPhotosAlbum 実行時にクラッシュする。
+/// </summary>
+public static class NativeSharePostProcessBuild
+{
+    // 必要に応じて文言を変更してください(App Store 審査でも参照されます)
+    private const string PhotoAddUsageDescription =
+        "撮影した画像を写真ライブラリに保存するために使用します。";
+
+    [PostProcessBuild(100)]
+    public static void OnPostProcessBuild(BuildTarget buildTarget, string pathToBuiltProject)
+    {
+#if UNITY_IOS
+        if (buildTarget != BuildTarget.iOS)
+        {
+            return;
+        }
+
+        string plistPath = pathToBuiltProject + "/Info.plist";
+
+        PlistDocument plist = new PlistDocument();
+        plist.ReadFromFile(plistPath);
+
+        PlistElementDict root = plist.root;
+
+        // 写真への「追加のみ」用途。保存だけならこちらで十分。
+        if (root["NSPhotoLibraryAddUsageDescription"] == null)
+        {
+            root.SetString("NSPhotoLibraryAddUsageDescription", PhotoAddUsageDescription);
+        }
+
+        plist.WriteToFile(plistPath);
+#endif
+    }
+}

Assets/Editor/NativeSharePostProcessBuild.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: cd4622b4fc896418bbf909c16d3dd6b1