Made pre-loading optional

Refactoring of PasswordActivity/QuickUnlock lifecycle

src/Kp2aBusinessLogic/database/Database.cs

@@ -109,7 +109,7 @@ namespace keepass2android
 			var filename = fileStorage.GetFilenameWithoutPathAndExt(iocInfo);
 			try
 			{
-				pwDatabase.Open(databaseData, filename, iocInfo, compositeKey, status);
+				pwDatabase.Open(databaseData ?? fileStorage.OpenFileForRead(iocInfo), filename, iocInfo, compositeKey, status);
 			}
 			catch (Exception)
 			{
@@ -118,8 +118,11 @@ namespace keepass2android
 					//if we don't get a password, we don't know whether this means "empty password" or "no password"
 					//retry without password:
 					compositeKey.RemoveUserKey(compositeKey.GetUserKey(typeof (KcpPassword)));
+					if (databaseData != null)
+					{
 						databaseData.Seek(0, SeekOrigin.Begin);
-					pwDatabase.Open(databaseData, filename, iocInfo, compositeKey, status);
+					}
+					pwDatabase.Open(databaseData ?? fileStorage.OpenFileForRead(iocInfo), filename, iocInfo, compositeKey, status);
 				}
 				else throw;
 			}

src/Kp2aBusinessLogic/database/edit/LoadDB.cs

@@ -48,7 +48,7 @@ namespace keepass2android
 			try
 			{
 				StatusLogger.UpdateMessage(UiStringKey.loading_database);
-				_app.LoadDatabase(_ioc, _databaseData.Result, _pass, _key, StatusLogger);
+				_app.LoadDatabase(_ioc, _databaseData == null ? null : _databaseData.Result, _pass, _key, StatusLogger);
 				SaveFileData (_ioc, _key);
 				
 			} catch (KeyFileException) {

src/keepass2android/KeePass.cs

@@ -37,12 +37,9 @@ namespace keepass2android
 		public const Result ExitLock = Result.FirstUser+1;
 		public const Result ExitRefresh = Result.FirstUser+2;
 		public const Result ExitRefreshTitle = Result.FirstUser+3;
-		public const Result ExitForceLock = Result.FirstUser+4;
-		public const Result ExitQuickUnlock = Result.FirstUser+5;
-		public const Result ExitCloseAfterTaskComplete = Result.FirstUser+6;
-		public const Result ExitChangeDb = Result.FirstUser+7;
-		public const Result ExitForceLockAndChangeDb = Result.FirstUser+8;
-		public const Result ExitReloadDb = Result.FirstUser+9;
+		public const Result ExitCloseAfterTaskComplete = Result.FirstUser+4;
+		public const Result ExitChangeDb = Result.FirstUser+5; // NOTE: Nothing is currently using this, but in the future a "Change Database" menu option might.
+		public const Result ExitReloadDb = Result.FirstUser+6;
 
 		AppTask _appTask;
 

src/keepass2android/PasswordActivity.cs

@@ -59,6 +59,8 @@ namespace keepass2android
 		private bool _rememberKeyfile;
 		ISharedPreferences _prefs;
 
+		private bool _started;
+
 		public PasswordActivity (IntPtr javaReference, JniHandleOwnership transfer)
 			: base(javaReference, transfer)
 		{
@@ -139,26 +141,21 @@ namespace keepass2android
 			//NOTE: original code from k eepassdroid used switch ((Android.App.Result)requestCode) { (but doesn't work here, although k eepassdroid works)
 			switch(resultCode) {
 
+				case KeePass.ExitNormal: // Returned to this screen using the Back key, treat as locking the database
+					App.Kp2a.LockDatabase();
+					break;
 				case KeePass.ExitLock:
 					// The database has already been locked, and the quick unlock screen will be shown if appropriate
 					break;
-				case KeePass.ExitForceLock:
-					App.Kp2a.LockDatabase(false);
-					break;
-				case KeePass.ExitForceLockAndChangeDb:
-				case KeePass.ExitChangeDb: // What's the difference between this and ExitForceLockAndChangeDb?
-				case KeePass.ExitNormal: // Returned to this screen using the Back key, treat as exiting the database
+				case KeePass.ExitChangeDb:
 					App.Kp2a.LockDatabase(false);
 					Finish();
 					break;
 				case KeePass.ExitCloseAfterTaskComplete:
+					// Do not lock the database
 					SetResult(KeePass.ExitCloseAfterTaskComplete);
 					Finish();
 					break;
-				case KeePass.ExitQuickUnlock:
-					App.Kp2a.UnlockDatabase();
-					LaunchNextActivity();
-					break;
 				case KeePass.ExitReloadDb:
 					//if the activity was killed, fill password/keyfile so the user can directly hit load again
 					if (App.Kp2a.GetDb().Loaded)
@@ -180,8 +177,9 @@ namespace keepass2android
 							SetEditText(Resource.Id.pass_keyfile, kcpKeyfile.Path);
 						}
 					}
+					App.Kp2a.LockDatabase(false);
 					break;
-				case Result.Ok:
+				case Result.Ok: // Key file browse dialog OK'ed.
 					if (requestCode == Intents.RequestCodeFileBrowseForKeyfile) {
 						string filename = Util.IntentToFilename(data);
 						if (filename != null) {
@@ -258,6 +256,13 @@ namespace keepass2android
 				}
 			}
 
+			if (App.Kp2a.GetDb().Loaded && App.Kp2a.GetDb().Ioc != null &&
+				App.Kp2a.GetDb().Ioc.GetDisplayName() != _ioConnection.GetDisplayName())
+			{
+				// A different database is currently loaded, unload it before loading the new one requested
+				App.Kp2a.LockDatabase(false);
+			}
+
 			AppTask = AppTask.GetTaskInOnCreate(savedInstanceState, Intent);
 			
 			SetContentView(Resource.Layout.password);
@@ -363,19 +368,7 @@ namespace keepass2android
 		protected override void OnStart()
 		{
 			base.OnStart();
-
-			if (App.Kp2a.QuickUnlockEnabled && App.Kp2a.QuickLocked)
-			{
-				Intent i = new Intent(this, typeof(QuickUnlock));
-				PutIoConnectionToIntent(_ioConnection, i);
-				Kp2aLog.Log("Starting QuickUnlock");
-				StartActivityForResult(i, 0);
-			}
-			else
-			{
-				// Create task to kick off file loading while the user enters the password
-				_loadDbTask = Task.Factory.StartNew<MemoryStream>(LoadDbFile);
-			}
+			_started = true;
 		}
 
 		private MemoryStream LoadDbFile()
@@ -410,27 +403,33 @@ namespace keepass2android
 			AppTask.ToBundle(outState);
 		}
 		
-		/*
-		protected override void OnResume() {
+		protected override void OnResume()
+		{
 			base.OnResume();
 
-			if (_startedWithActivityResult)
-				return;
-
-			if (App.Kp2a.GetDb().Loaded && (App.Kp2a.GetDb().Ioc != null)
-			    && (_ioConnection != null) && (App.Kp2a.GetDb().Ioc.GetDisplayName() == _ioConnection.GetDisplayName()))
+			// OnResume is run every time the activity comes to the foreground. This code should only run when the activity is started (OnStart), but must
+			// be run in OnResume rather than OnStart so that it always occurrs after OnActivityResult (when re-creating a killed activity, OnStart occurs before OnActivityResult)
+			if (_started) 
 			{
-				if (App.Kp2a.QuickLocked == false)
+				_started = false;
+				if (App.Kp2a.DatabaseIsUnlocked)
 				{
 					LaunchNextActivity();
 				}
-				else 
+				else if (App.Kp2a.QuickUnlockEnabled && App.Kp2a.QuickLocked)
 				{
-					TryStartQuickUnlock();
+					var i = new Intent(this, typeof(QuickUnlock));
+					PutIoConnectionToIntent(_ioConnection, i);
+					Kp2aLog.Log("Starting QuickUnlock");
+					StartActivityForResult(i, 0);
+				}
+				else if (_loadDbTask == null && _prefs.GetBoolean(GetString(Resource.String.PreloadDatabaseEnabled_key), true))
+				{
+					// Create task to kick off file loading while the user enters the password
+					_loadDbTask = Task.Factory.StartNew<MemoryStream>(LoadDbFile);
 				}
 			}
 		}
-		 * */
 		
 		private void RetrieveSettings() {
 			String defaultFilename = _prefs.GetString(KeyDefaultFilename, "");

src/keepass2android/QuickUnlock.cs

@@ -72,8 +72,6 @@ namespace keepass2android
 				keyboard.ShowSoftInput(pwd, 0);
 			}, 50);
 
-			SetResult(KeePass.ExitChangeDb);
-
 			Button btnUnlock = (Button)FindViewById(Resource.Id.QuickUnlock_button);
 			btnUnlock.Click += (object sender, EventArgs e) => 
 			{
@@ -82,11 +80,11 @@ namespace keepass2android
 				String expectedPasswordPart = password.Substring(Math.Max(0,password.Length-quickUnlockLength),Math.Min(password.Length, quickUnlockLength));
 				if (pwd.Text == expectedPasswordPart)
 				{
-					SetResult(KeePass.ExitQuickUnlock);
+					App.Kp2a.UnlockDatabase();
 				}
 				else
 				{
-					SetResult(KeePass.ExitForceLock);
+					App.Kp2a.LockDatabase(false);
 					Toast.MakeText(this, GetString(Resource.String.QuickUnlock_fail), ToastLength.Long).Show();
 				}
 				Finish();
@@ -95,22 +93,10 @@ namespace keepass2android
 			Button btnLock = (Button)FindViewById(Resource.Id.QuickUnlock_buttonLock);
 			btnLock.Click += (object sender, EventArgs e) => 
 			{
-				SetResult(KeePass.ExitForceLockAndChangeDb);
+				App.Kp2a.LockDatabase(false);
 				Finish();
 			};
 		}
-
-
-		protected override void OnResume()
-		{
-			base.OnResume();
-
-			if ( ! App.Kp2a.GetDb().Loaded ) {
-				SetResult(KeePass.ExitChangeDb);
-				Finish();
-				return;
-			}
-		}
 	}
 }
 

src/keepass2android/Resources/values/config.xml

@@ -92,4 +92,7 @@
 	<string name="ShowUnlockedNotification_key">ShowUnlockedNotification</string>
 	<bool name="ShowUnlockedNotification_default">true</bool>
 
+	<string name="PreloadDatabaseEnabled_key">PreloadDatabaseEnabled</string>
+	<bool name="PreloadDatabaseEnabled_default">true</bool>
+
 </resources>

src/keepass2android/Resources/values/strings.xml

@@ -233,6 +233,9 @@
 	<string name="ShowUnlockedNotification_title">Notification while unlocked</string>
 	<string name="ShowUnlockedNotification_summary">Show an ongoing notification while the database is unlocked.</string>
 
+	<string name="PreloadDatabaseEnabled_title">Pre-load database file</string>
+	<string name="PreloadDatabaseEnabled_summary">Start background loading or downloading of the database file during password entry.</string>
+
 	<string name="AskOverwriteBinary">Do you want to overwrite the existing binary with the same name?</string>
   <string name="AskOverwriteBinary_title">Overwrite existing binary?</string>
   <string name="AskOverwriteBinary_yes">Overwrite</string>

src/keepass2android/Resources/xml/preferences.xml

@@ -163,6 +163,12 @@
 			  android:defaultValue="true"
 			  android:title="@string/CheckForFileChangesOnSave_title"
 			  android:key="@string/CheckForFileChangesOnSave_key" />
-
+		<CheckBoxPreference
+			android:enabled="true"
+				 android:persistent="true"
+				 android:summary="@string/PreloadDatabaseEnabled_summary"
+				 android:defaultValue="@bool/PreloadDatabaseEnabled_default"
+				 android:title="@string/PreloadDatabaseEnabled_title"
+				 android:key="@string/PreloadDatabaseEnabled_key" />
 	</PreferenceScreen>
 </PreferenceScreen>