Fixes in PasswordActivity:

* correctly set keyfile when reloading
* show toast in main thread
Allow importing keyfile to internal folder

src/KeePassLib2Android/Keys/KcpKeyFile.cs

@@ -326,5 +326,14 @@ namespace KeePassLib.Keys
 
 			sOut.Close();
 		}
+
+		/// <summary>
+		/// Allows to change the ioc value (without reloading the data, assuming it's the same content)
+		/// </summary>
+		/// <param name="newIoc"></param>
+		public void ResetIoc(IOConnectionInfo newIoc)
+		{
+			m_ioc = newIoc;
+		}
 	}
 }

src/keepass2android/PasswordActivity.cs

@@ -234,6 +234,18 @@ namespace keepass2android
 					break;
 				case KeePass.ExitLock:
 					// The database has already been locked, and the quick unlock screen will be shown if appropriate
+
+					_rememberKeyfile = _prefs.GetBoolean(GetString(Resource.String.keyfile_key), Resources.GetBoolean(Resource.Boolean.keyfile_default)); //update value
+					if ((KeyProviderType == KeyProviders.KeyFile) && (_rememberKeyfile))
+					{
+						//check if the keyfile was changed (by importing to internal directory)
+						var newKeyFile = GetKeyFile(_ioConnection.Path);
+						if (newKeyFile != _keyFileOrProvider)
+						{
+							_keyFileOrProvider = newKeyFile;
+							UpdateKeyfileIocView();
+						}
+					}
 					break;
 				case KeePass.ExitCloseAfterTaskComplete:
 					// Do not lock the database
@@ -261,9 +273,8 @@ namespace keepass2android
 						{
 							
 							KcpKeyFile kcpKeyfile = (KcpKeyFile)App.Kp2a.GetDb().KpDatabase.MasterKey.GetUserKey(typeof(KcpKeyFile));
-
-							FindViewById<TextView>(Resource.Id.label_keyfilename).Text =
-								App.Kp2a.GetFileStorage(kcpKeyfile.Ioc).GetDisplayName(kcpKeyfile.Ioc);
+							_keyFileOrProvider = IOConnectionInfo.SerializeToString(kcpKeyfile.Ioc);
+							UpdateKeyfileIocView();
 
 						}
 					}
@@ -929,7 +940,11 @@ namespace keepass2android
 			                        true, () =>
 				                        {
 					                        CompositeKey compositeKey;
-					                        if (!CreateCompositeKey(out compositeKey)) return (() => { });
+					                        string errorMessage;
+					                        if (!CreateCompositeKey(out compositeKey, out errorMessage)) return (() =>
+						                        {
+							                        Toast.MakeText(this, errorMessage, ToastLength.Long).Show();
+						                        });
 											return () => { PerformLoadDatabaseWithCompositeKey(compositeKey); };
 				                        }).Execute();
 			
@@ -959,8 +974,9 @@ namespace keepass2android
 			new ProgressTask(App.Kp2a, this, task).Run();
 		}
 
-		private bool CreateCompositeKey(out CompositeKey compositeKey)
+		private bool CreateCompositeKey(out CompositeKey compositeKey, out string errorMessage)
 		{
+			errorMessage = null;
 //no need to check for validity of password because if this method is called, the Ok button was enabled (i.e. there was a valid password)
 			compositeKey = new CompositeKey();
 			compositeKey.AddUserKey(new KcpPassword(_password));
@@ -980,13 +996,13 @@ namespace keepass2android
 				catch (System.IO.FileNotFoundException e)
 				{
 					Kp2aLog.Log(e.ToString());
-					Toast.MakeText(this, App.Kp2a.GetResourceString(UiStringKey.keyfile_does_not_exist), ToastLength.Long).Show();
+					errorMessage = App.Kp2a.GetResourceString(UiStringKey.keyfile_does_not_exist);
 					return false;
 				}
 				catch (Exception e)
 				{
 					Kp2aLog.Log(e.ToString());
-					Toast.MakeText(this, e.Message, ToastLength.Long).Show();
+					errorMessage = e.Message;
 					return false;
 				}
 			}
@@ -1001,7 +1017,7 @@ namespace keepass2android
 				catch (Exception e)
 				{
 					Kp2aLog.Log(e.ToString());
-					Toast.MakeText(this, GetString(Resource.String.OtpKeyError), ToastLength.Long).Show();
+					errorMessage = GetString(Resource.String.OtpKeyError);
 
 					return false;
 				}
@@ -1019,7 +1035,7 @@ namespace keepass2android
 				}
 				else
 				{
-					Toast.MakeText(this, Resource.String.CouldntParseOtpSecret, ToastLength.Long).Show();
+					errorMessage = GetString(Resource.String.CouldntParseOtpSecret);
 					return false;
 				}
 			}

src/keepass2android/Resources/values/strings.xml

@@ -45,7 +45,9 @@
 	<string name="import_keyfile_prefs">Import key file to internal folder</string>
 	<string name="OnlyAvailableForLocalFiles">Only available for local files.</string>
 	<string name="FileIsInInternalDirectory">File is stored in internal directory.</string>
-	<string name="DatabaseFileMoved">Database file was copied to internal folder. Press Ok to open from the new location. Note: Do not forget to regularly export/backup the database!</string>
+	<string name="DatabaseFileMoved">Database file was copied to internal folder. Press Ok to open from the new location. Note: Do not forget to regularly export the database to a safe storage!</string>
+	<string name="KeyfileMoved">Keyfile was copied to internal folder. Make sure you have a safe backup before deleting from the current location!</string>
+	<string name="KeyfileMoveRequiresRememberKeyfile">Cannot use internal folder when key file location is not remembered. Change security preferences.</string>
 
 	<string name="brackets">Brackets</string>
   <string name="cancel">Cancel</string>

src/keepass2android/settings/DatabaseSettingsActivity.cs

@@ -24,6 +24,7 @@ using Android.Widget;
 using Android.Preferences;
 using Java.IO;
 using KeePassLib.Cryptography.Cipher;
+using KeePassLib.Keys;
 using KeePassLib.Serialization;
 using KeePassLib.Utility;
 using keepass2android.Io;
@@ -180,8 +181,90 @@ namespace keepass2android
 			SetAlgorithm(db, algorithm);
 
 			UpdateImportDbPref();
+			UpdateImportKeyfilePref();
 		}
 
+		private void UpdateImportKeyfilePref()
+		{
+			var prefs = PreferenceManager.GetDefaultSharedPreferences(this);
+			var rememberKeyfile = prefs.GetBoolean(GetString(Resource.String.keyfile_key), Resources.GetBoolean(Resource.Boolean.keyfile_default));
+
+			Preference importDb = FindPreference("import_keyfile_prefs");
+			importDb.Summary = "";
+
+			if (!rememberKeyfile)
+			{
+				importDb.Summary = GetString(Resource.String.KeyfileMoveRequiresRememberKeyfile);
+				importDb.Enabled = false;
+				return;
+			}
+			CompositeKey masterKey = App.Kp2a.GetDb().KpDatabase.MasterKey;
+			if (masterKey.ContainsType(typeof (KcpKeyFile)))
+			{
+				IOConnectionInfo iocKeyfile = ((KcpKeyFile)masterKey.GetUserKey(typeof (KcpKeyFile))).Ioc;
+				if (iocKeyfile.IsLocalFile() && IoUtil.IsInInternalDirectory(iocKeyfile.Path, this))
+				{
+					importDb.Enabled = false;
+					importDb.Summary = GetString(Resource.String.FileIsInInternalDirectory);
+				}
+				else
+				{
+					importDb.Enabled = true;
+					importDb.PreferenceClick += (sender, args) => { MoveKeyfileToInternalFolder();};
+				}
+				
+
+			}
+			else
+			{
+				importDb.Enabled = false;
+			}
+		}
+
+		private void MoveKeyfileToInternalFolder()
+		{
+			Func<Action> copyAndReturnPostExecute = () =>
+			{
+				try
+				{	
+					CompositeKey masterKey = App.Kp2a.GetDb().KpDatabase.MasterKey;
+					var sourceIoc = ((KcpKeyFile)masterKey.GetUserKey(typeof(KcpKeyFile))).Ioc;
+					var newIoc = ImportFileToInternalDirectory(sourceIoc);
+					((KcpKeyFile)masterKey.GetUserKey(typeof(KcpKeyFile))).ResetIoc(newIoc);
+					var keyfileString = IOConnectionInfo.SerializeToString(newIoc);
+					App.Kp2a.StoreOpenedFileAsRecent(App.Kp2a.GetDb().Ioc, keyfileString);
+					return () =>
+					{
+						UpdateImportKeyfilePref();
+						var builder = new AlertDialog.Builder(this);
+						builder
+							.SetMessage(Resource.String.KeyfileMoved);
+						builder.SetPositiveButton(Android.Resource.String.Ok, (sender, args) => { });
+						builder.Show();
+
+					};
+
+
+
+
+				}
+				catch (Exception e)
+				{
+					return () =>
+					{
+						Toast.MakeText(this, App.Kp2a.GetResourceString(UiStringKey.ErrorOcurred) + " " + e.Message, ToastLength.Long).Show();
+					};
+				}
+
+
+
+			};
+
+			new SimpleLoadingDialog(this, GetString(Resource.String.CopyingFile), false,
+								  copyAndReturnPostExecute
+				).Execute();
+
+		}
 		private void UpdateImportDbPref()
 		{
 //Import db/key file preferences: