パーミッションチェックを追加, 使えない機能を非表示に

app/src/main/java/one/nem/lacerta/MainActivity.java

@@ -1,5 +1,6 @@
 package one.nem.lacerta;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.content.ContextCompat;
@@ -11,6 +12,7 @@ import androidx.navigation.fragment.NavHostFragment;
 import androidx.navigation.ui.NavigationUI;
 
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.graphics.Color;
 import android.os.Bundle;
 import android.util.Log;
@@ -85,6 +87,21 @@ public class MainActivity extends AppCompatActivity implements FragmentNavigatio
         });
 
     }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        if (requestCode == 1) {
+            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                Toast.makeText(this, "Permission granted", Toast.LENGTH_SHORT).show();
+            } else {
+                Toast.makeText(this, "Permission denied", Toast.LENGTH_SHORT).show();
+                Toast.makeText(this, "カメラの権限は必須です.", Toast.LENGTH_LONG).show();
+                finish(); // Exit app
+            }
+        }
+    }
+
     private void initializeApp() {
         Log.d("Init", "Initializing app");
         // Set feature switch override to default value