CW-351-Add-option-in-Privacy-settings-to-enable-disable-screenshots (#885)

* add prevent screenshots option

* fix prevent screen recording

* update localization

* Update strings_ja.arb

lib/core/backup_service.dart

@@ -209,6 +209,7 @@ class BackupService {
     final currentBalanceDisplayMode = data[PreferencesKey.currentBalanceDisplayModeKey] as int?;
     final currentFiatCurrency = data[PreferencesKey.currentFiatCurrencyKey] as String?;
     final shouldSaveRecipientAddress = data[PreferencesKey.shouldSaveRecipientAddressKey] as bool?;
+    final isAppSecure = data[PreferencesKey.isAppSecureKey] as bool?;
     final currentTransactionPriorityKeyLegacy = data[PreferencesKey.currentTransactionPriorityKeyLegacy] as int?;
     final allowBiometricalAuthentication = data[PreferencesKey.allowBiometricalAuthenticationKey] as bool?;
     final currentBitcoinElectrumSererId = data[PreferencesKey.currentBitcoinElectrumSererIdKey] as int?;
@@ -245,6 +246,11 @@ class BackupService {
         PreferencesKey.shouldSaveRecipientAddressKey,
         shouldSaveRecipientAddress);
 
+    if (isAppSecure != null)
+      await _sharedPreferences.setBool(
+          PreferencesKey.isAppSecureKey,
+          isAppSecure);
+
     if (currentTransactionPriorityKeyLegacy != null)
       await _sharedPreferences.setInt(
         PreferencesKey.currentTransactionPriorityKeyLegacy,

lib/entities/preferences_key.dart

@@ -9,6 +9,7 @@ class PreferencesKey {
   static const currentTransactionPriorityKeyLegacy = 'current_fee_priority';
   static const currentBalanceDisplayModeKey = 'current_balance_display_mode';
   static const shouldSaveRecipientAddressKey = 'save_recipient_address';
+  static const isAppSecureKey = 'is_app_secure';
   static const currentFiatApiModeKey = 'current_fiat_api_mode';
   static const allowBiometricalAuthenticationKey =
       'allow_biometrical_authentication';

lib/src/screens/settings/privacy_page.dart

@@ -8,6 +8,7 @@ import 'package:cake_wallet/view_model/settings/choices_list_item.dart';
 import 'package:cake_wallet/view_model/settings/privacy_settings_view_model.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_mobx/flutter_mobx.dart';
+import 'dart:io' show Platform;
 
 class PrivacyPage extends BasePage {
   PrivacyPage(this._privacySettingsViewModel);
@@ -48,6 +49,13 @@ class PrivacyPage extends BasePage {
                 onValueChange: (BuildContext _, bool value) {
                   _privacySettingsViewModel.setShouldSaveRecipientAddress(value);
                 }),
+            if (Platform.isAndroid)
+            SettingsSwitcherCell(
+                title: S.current.prevent_screenshots,
+                value: _privacySettingsViewModel.isAppSecure,
+                onValueChange: (BuildContext _, bool value) {
+                  _privacySettingsViewModel.setIsAppSecure(value);
+                }),
           ],
         );
       }),

lib/store/settings_store.dart

@@ -19,6 +19,8 @@ import 'package:cw_core/node.dart';
 import 'package:cake_wallet/monero/monero.dart';
 import 'package:cake_wallet/entities/action_list_display_mode.dart';
 import 'package:cake_wallet/entities/fiat_api_mode.dart';
+import 'package:cw_core/set_app_secure_native.dart';
+import 'dart:io' show Platform;
 
 part 'settings_store.g.dart';
 
@@ -31,6 +33,7 @@ abstract class SettingsStoreBase with Store {
       required FiatCurrency initialFiatCurrency,
       required BalanceDisplayMode initialBalanceDisplayMode,
       required bool initialSaveRecipientAddress,
+      required bool initialAppSecure,
       required FiatApiMode initialFiatMode,
       required bool initialAllowBiometricalAuthentication,
       required ExchangeApiMode initialExchangeStatus,
@@ -53,6 +56,7 @@ abstract class SettingsStoreBase with Store {
     fiatCurrency = initialFiatCurrency,
     balanceDisplayMode = initialBalanceDisplayMode,
     shouldSaveRecipientAddress = initialSaveRecipientAddress,
+        isAppSecure = initialAppSecure,
     fiatApiMode = initialFiatMode,
     allowBiometricalAuthentication = initialAllowBiometricalAuthentication,
         shouldShowMarketPlaceInDashboard = initialShouldShowMarketPlaceInDashboard,
@@ -119,6 +123,17 @@ abstract class SettingsStoreBase with Store {
             PreferencesKey.shouldSaveRecipientAddressKey,
             shouldSaveRecipientAddress));
 
+    reaction((_) => isAppSecure, (bool isAppSecure) {
+      sharedPreferences.setBool(PreferencesKey.isAppSecureKey, isAppSecure);
+      if (Platform.isAndroid) {
+        setIsAppSecureNative(isAppSecure);
+      }
+    });
+
+    if (Platform.isAndroid) {
+      setIsAppSecureNative(isAppSecure);
+    }
+
     reaction(
             (_) => fiatApiMode,
             (FiatApiMode mode) => sharedPreferences.setInt(
@@ -199,6 +214,9 @@ abstract class SettingsStoreBase with Store {
   @observable
   bool shouldSaveRecipientAddress;
 
+  @observable
+  bool isAppSecure;
+
   @observable
   bool allowBiometricalAuthentication;
 
@@ -289,6 +307,8 @@ abstract class SettingsStoreBase with Store {
     // FIX-ME: Check for which default value we should have here
     final shouldSaveRecipientAddress =
         sharedPreferences.getBool(PreferencesKey.shouldSaveRecipientAddressKey) ?? false;
+    final isAppSecure =
+        sharedPreferences.getBool(PreferencesKey.isAppSecureKey) ?? false;
     final currentFiatApiMode = FiatApiMode.deserialize(
         raw: sharedPreferences
             .getInt(PreferencesKey.currentFiatApiModeKey) ?? FiatApiMode.enabled.raw);
@@ -316,7 +336,7 @@ abstract class SettingsStoreBase with Store {
     final pinCodeTimeOutDuration = timeOutDuration != null
         ? PinCodeRequiredDuration.deserialize(raw: timeOutDuration)
         : defaultPinCodeTimeOutDuration;
-    
+
     // If no value
     if (pinLength == null || pinLength == 0) {
       pinLength = defaultPinLength;
@@ -367,6 +387,7 @@ abstract class SettingsStoreBase with Store {
         initialFiatCurrency: currentFiatCurrency,
         initialBalanceDisplayMode: currentBalanceDisplayMode,
         initialSaveRecipientAddress: shouldSaveRecipientAddress,
+        initialAppSecure: isAppSecure,
         initialFiatMode: currentFiatApiMode,
         initialAllowBiometricalAuthentication: allowBiometricalAuthentication,
         initialExchangeStatus: exchangeStatus,
@@ -412,6 +433,8 @@ abstract class SettingsStoreBase with Store {
             .getInt(PreferencesKey.currentBalanceDisplayModeKey)!);
     shouldSaveRecipientAddress =
         sharedPreferences.getBool(PreferencesKey.shouldSaveRecipientAddressKey) ?? shouldSaveRecipientAddress;
+    isAppSecure =
+        sharedPreferences.getBool(PreferencesKey.isAppSecureKey) ?? isAppSecure;
     allowBiometricalAuthentication = sharedPreferences
         .getBool(PreferencesKey.allowBiometricalAuthenticationKey) ??
         allowBiometricalAuthentication;

lib/view_model/settings/privacy_settings_view_model.dart

@@ -21,6 +21,9 @@ abstract class PrivacySettingsViewModelBase with Store {
   @computed
   FiatApiMode get fiatApiMode => _settingsStore.fiatApiMode;
 
+  @computed
+  bool get isAppSecure => _settingsStore.isAppSecure;
+
   @action
   void setShouldSaveRecipientAddress(bool value) => _settingsStore.shouldSaveRecipientAddress = value;
 
@@ -30,4 +33,7 @@ abstract class PrivacySettingsViewModelBase with Store {
   @action
   void setFiatMode(FiatApiMode fiatApiMode) => _settingsStore.fiatApiMode = fiatApiMode;
 
+  @action
+  void setIsAppSecure(bool value) => _settingsStore.isAppSecure = value;
+
 }