Add settings to enable screenshots (special features)

app/src/main/java/org/shadowice/flocke/andotp/Activities/MainActivity.java

@@ -279,7 +279,10 @@ public class MainActivity extends BaseActivity
         super.onCreate(savedInstanceState);
 
         setTitle(R.string.app_name);
-        getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+
+        if (! settings.getScreenshotsEnabled())
+            getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+
         setContentView(R.layout.activity_main);
 
         Toolbar toolbar = findViewById(R.id.toolbar);
@@ -434,7 +437,8 @@ public class MainActivity extends BaseActivity
                 key.equals(getString(R.string.settings_key_thumbnail_size))) {
             adapter.notifyDataSetChanged();
         } else if (key.equals(getString(R.string.settings_key_theme)) ||
-                key.equals(getString(R.string.settings_key_lang))) {
+                key.equals(getString(R.string.settings_key_lang)) ||
+                key.equals(getString(R.string.settings_key_enable_screenshot))) {
             recreate();
         }
     }

app/src/main/java/org/shadowice/flocke/andotp/Activities/SettingsActivity.java

@@ -147,6 +147,8 @@ public class SettingsActivity extends BaseActivity
         public void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
 
+            SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(getActivity().getBaseContext());
+
             addPreferencesFromResource(R.xml.preferences);
 
             // Authentication
@@ -191,6 +193,12 @@ public class SettingsActivity extends BaseActivity
                 }
             });
             pgpKey.setDefaultUserId("Alice <alice@example.com>");
+
+
+            if (sharedPref.contains(getString(R.string.settings_key_special_features)) &&
+                    sharedPref.getBoolean(getString(R.string.settings_key_special_features), false)) {
+                addPreferencesFromResource(R.xml.preferences_special);
+            }
         }
     }
 }

app/src/main/java/org/shadowice/flocke/andotp/Utilities/Settings.java

@@ -360,4 +360,8 @@ public class Settings {
             return context.getResources().getDimensionPixelSize(R.dimen.card_thumbnail_size);
         }
     }
+
+    public boolean getScreenshotsEnabled() {
+        return getBoolean(R.string.settings_key_enable_screenshot, false);
+    }
 }

app/src/main/res/values/settings.xml

@@ -34,6 +34,8 @@
     <string name="settings_key_no_tags_toggle" translatable="false">pref_no_tags_toggle</string>
     <string name="settings_key_tags_toggles" translatable="false">pref_tags_toggles</string>
 
+    <string name="settings_key_enable_screenshot" translatable="false">pref_enable_screenshot</string>
+
     <!-- Default values -->
     <string name="settings_default_auth" translatable="false">none</string>
     <string name="settings_default_lang" translatable="false">system</string>

app/src/main/res/values/strings_settings.xml

@@ -29,6 +29,8 @@
     <string name="settings_title_openpgp_sign">Sign encrypted backups</string>
     <string name="settings_title_openpgp_verify">Verify encrypted backups</string>
 
+    <string name="settings_title_enable_screenshot">Enable screenshots</string>
+
     <!-- Descriptions -->
     <string name="settings_desc_tap_to_reveal">Hide the OTP tokens by default, requiring them to be
         revealed manually</string>
@@ -48,6 +50,9 @@
     <string name="settings_desc_openpgp_verify">Encrypted backups are only imported if they are
         signed with a valid key</string>
 
+    <string name="settings_desc_enable_screenshot">Allow to take screenshots of the main screen
+        (disabled by default for security reasons)</string>
+
     <!-- Toasts -->
     <string name="settings_toast_auth_device_pre_lollipop">This feature requires at least Android 5.0
         (Lollipop) to work</string>

app/src/main/res/xml/preferences_special.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen
+    xmlns:android="http://schemas.android.com/apk/res/android" >
+
+    <PreferenceCategory
+        android:title="@string/about_title_special_features" >
+
+        <CheckBoxPreference
+            android:key="@string/settings_key_enable_screenshot"
+            android:title="@string/settings_title_enable_screenshot"
+            android:summary="@string/settings_desc_enable_screenshot"
+            android:defaultValue="false" />
+
+    </PreferenceCategory>
+
+</PreferenceScreen>