Merge pull request #204 from keshav-space/203-secure-native

Refactor(android): Use native API for secure display

android/app/src/main/kotlin/com/trisven/safenotes/MainActivity.kt

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) Keshav Priyadarshi and others - All Rights Reserved.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ * You may use, distribute and modify this code under the
+ * terms of the GPL-3.0+ license.
+ *
+ * You should have received a copy of the GNU General Public License v3.0 with
+ * this file. If not, please visit https://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * See https://safenotes.dev for support or download.
+ */
+
+package com.trisven.safenotes
+
+import android.content.SharedPreferences
+import android.os.Build
+import android.os.Bundle
+import android.view.WindowManager
+import io.flutter.embedding.android.FlutterFragmentActivity
+
+class MainActivity : FlutterFragmentActivity() {
+
+    private val PREFS_NAME = "FlutterSharedPreferences"
+    private val SECURE_FLAG_KEY = "flutter.isFlagSecure"
+
+    private val prefsListener =
+        SharedPreferences.OnSharedPreferenceChangeListener { sharedPreferences, key ->
+            if (key == SECURE_FLAG_KEY) {
+                updateSecureDisplaySetting()
+            }
+        }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        // Initial secure display setting
+        updateSecureDisplaySetting()
+
+        // Listen for changes in the secure display setting
+        val prefs = getSharedPreferences(PREFS_NAME, MODE_PRIVATE)
+        prefs.registerOnSharedPreferenceChangeListener(prefsListener)
+        super.onCreate(savedInstanceState)
+    }
+
+    override fun onDestroy() {
+        val prefs = getSharedPreferences(PREFS_NAME, MODE_PRIVATE)
+        prefs.unregisterOnSharedPreferenceChangeListener(prefsListener)
+        super.onDestroy()
+    }
+
+    private fun updateSecureDisplaySetting() {
+        val prefs = getSharedPreferences(PREFS_NAME, MODE_PRIVATE)
+        val isSecure = prefs.getBoolean(SECURE_FLAG_KEY, true)
+
+        if (isSecure) {
+            window.setFlags(
+                WindowManager.LayoutParams.FLAG_SECURE,
+                WindowManager.LayoutParams.FLAG_SECURE
+            )
+
+        } else {
+            window.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)
+        }
+
+
+        // Disable screenshots in recents screen if API level is 33 or higher
+        // https://developer.android.com/reference/android/app/Activity#setRecentsScreenshotEnabled(boolean)
+
+        // Note: App screenshots will never appear in recent screens even if secure display is turned off 
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            setRecentsScreenshotEnabled(false)
+        }
+    }
+}

lib/main.dart

@@ -13,15 +13,13 @@
 
 // Dart imports:
 import 'dart:async';
-import 'dart:io' show Platform;
 
 // Flutter imports:
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
 // Package imports:
 import 'package:easy_localization/easy_localization.dart';
-import 'package:flutter_windowmanager/flutter_windowmanager.dart';
 import 'package:local_session_timeout/local_session_timeout.dart';
 
 // Project imports:
@@ -43,9 +41,6 @@ Future main() async {
   ));
 
   await PreferencesStorage.init();
-  if (Platform.isAndroid && PreferencesStorage.isFlagSecure) {
-    await FlutterWindowManager.addFlags(FlutterWindowManager.FLAG_SECURE);
-  }
 
   await SystemChrome.setPreferredOrientations([
     DeviceOrientation.portraitUp,

pubspec.lock

@@ -341,14 +341,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  flutter_windowmanager:
-    dependency: "direct main"
-    description:
-      name: flutter_windowmanager
-      sha256: b4d0bc06f6777952b729c0cdb7ce9ad1ecabd8b8b1cb0acb57a36621457dab1b
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.2.0"
   glob:
     dependency: transitive
     description:

pubspec.yaml

@@ -24,7 +24,6 @@ dependencies:
   file_picker: ^8.0.0+1
   flutter_secure_storage: ^9.0.0
   flutter_staggered_grid_view: ^0.7.0
-  flutter_windowmanager: ^0.2.0
   intl: ^0.18.1
   local_auth: ^2.1.2
   local_session_timeout: ^2.1.1