allow to hide the length of the QuickUnlock code. Closes #52

src/keepass2android/QuickUnlock.cs

@@ -107,7 +107,16 @@ namespace keepass2android
 
 			_quickUnlockLength = App.Kp2a.QuickUnlockKeyLength;
 
-			txtLabel.Text = GetString(Resource.String.QuickUnlock_label, new Java.Lang.Object[] {_quickUnlockLength});
+		    if (PreferenceManager.GetDefaultSharedPreferences(this)
+		        .GetBoolean(GetString(Resource.String.QuickUnlockHideLength_key), false))
+		    {
+		        txtLabel.Text = GetString(Resource.String.QuickUnlock_label_secure);
+            }
+		    else
+		    {
+		        txtLabel.Text = GetString(Resource.String.QuickUnlock_label, new Java.Lang.Object[] { _quickUnlockLength });
+            }
+			
 
 			EditText pwd = (EditText) FindViewById(Resource.Id.QuickUnlock_password);
 			pwd.SetEms(_quickUnlockLength);

src/keepass2android/Resources/values/config.xml

@@ -97,6 +97,7 @@
 	<string name="FileHandling_prefs_key">FileHandling_prefs_key</string>
 	<string name="keyboardswitch_prefs_key">keyboardswitch_prefs_key</string>
   <string name="AutoFill_prefs_key">AutoFill_prefs_key</string>
+  <string name="QuickUnlockHideLength_key">QuickUnlockHideLength_key</string>
   
 
   <string name="OfflineMode_key">OfflineMode_key</string>

src/keepass2android/Resources/values/strings.xml

@@ -290,6 +290,7 @@
   <string name="enter_filename_details_create_import">File to import will be selected in the next step.</string>
   <string name="enable_quickunlock">Enable QuickUnlock</string>
   <string name="QuickUnlock_label">Enter last %1$d characters of your password:</string>
+  <string name="QuickUnlock_label_secure">Enter QuickUnlock code:</string>
   <string name="QuickUnlock_button">QuickUnlock!</string>
   <string name="QuickUnlock_lockButton">Close database</string>
   <string name="QuickUnlockDefaultEnabled_title">Enable QuickUnlock by default</string>
@@ -302,6 +303,9 @@
   <string name="QuickUnlockIconHidden16_summary">QuickUnlock requires a notification to work properly. Select this option to display a notification without an icon.</string>
   <string name="QuickUnlockLength_title">Length of QuickUnlock key</string>
   <string name="QuickUnlockLength_summary">Maximum number of characters used as QuickUnlock password.</string>
+  <string name="QuickUnlockHideLength_title">Hide QuickUnlock length</string>
+  <string name="QuickUnlockHideLength_summary">If enabled, the length of the QuickUnlock code is not displayed on the QuickUnlock screen.</string>
+  
   <string name="QuickUnlock_fail">QuickUnlock failed: incorrect password!</string>
   <string name="BinaryDirectory_title">File attachments directory</string>
   <string name="BinaryDirectory_summary">Directory where file attachments are saved to.</string>

src/keepass2android/Resources/xml/preferences.xml

@@ -423,6 +423,14 @@
 				 android:defaultValue="true"
 				 android:title="@string/QuickUnlockIconHidden16_title"
 				 android:key="@string/QuickUnlockIconHidden16_key" />
+		  <CheckBoxPreference
+		    android:enabled="true"
+		    android:persistent="true"
+		    android:summary="@string/QuickUnlockHideLength_summary"
+		    android:defaultValue="false"
+		    android:title="@string/QuickUnlockHideLength_title"
+		    android:key="@string/QuickUnlockHideLength_key" />
+      
 		</PreferenceScreen>
 		<PreferenceScreen
 	  android:key="@string/FileHandling_prefs_key"