diff --git a/apk/webview/src/app/example/ExampleApp.java b/apk/webview/src/app/example/ExampleApp.java
index 0d68748..e21a860 100644
--- a/apk/webview/src/app/example/ExampleApp.java
+++ b/apk/webview/src/app/example/ExampleApp.java
@@ -13,6 +13,7 @@ import android.view.*;
 //import android.view.MenuItem;
 import android.view.ViewGroup.*;
 import android.widget.*;
+//import android.widget.Toast;
 //import android.widget.TextView;
 import android.webkit.*;
 import android.net.Uri;
@@ -157,12 +158,16 @@ public class ExampleApp extends Activity {
             }
         }.start();
 //        Intent intent = new Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION, Uri.parse("package: app.example"));// + BuildConfig.APPLICATION_ID));
-        Intent intent = new Intent();
-        intent.setAction(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION);
+        if(!Environment.isExternalStorageManager()){
+            Intent intent = new Intent();
+            intent.setAction(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION);
+            Uri uri = Uri.fromParts("package", this.getPackageName(), null);
+            intent.setData(uri);
+            startActivity(intent);
+        } else {
+            Toast.makeText(this, "berechtigt", Toast.LENGTH_SHORT).show();
+        }
         //intent.setAction(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
-        Uri uri = Uri.fromParts("package", this.getPackageName(), null);
-        intent.setData(uri);
-        startActivity(intent);
 //        startActivityForResult(intent, APP_STORAGE_ACCESS_REQUEST_CODE);
     }
     @JavascriptInterface