Key files can be opened from deliberate locations

TODO: fix a problem with .kdb-files and key files

Added very basic and not yet functional AndroidContentStorage.cs

src/Kp2aBusinessLogic/Io/AndroidContentStorage.cs

@@ -0,0 +1,183 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using KeePassLib.Serialization;
+
+namespace keepass2android.Io
+{
+	//TODOC,TOTEST, TODO: unimplemented methods?
+	public class AndroidContentStorage: IFileStorage
+	{
+		private readonly Context _ctx;
+
+		public AndroidContentStorage(Context ctx)
+		{
+			_ctx = ctx;
+		}
+
+		public IEnumerable<string> SupportedProtocols
+		{
+			get { yield return "content"; }
+		}
+
+		public void Delete(IOConnectionInfo ioc)
+		{
+			throw new NotImplementedException();
+		}
+
+		public bool CheckForFileChangeFast(IOConnectionInfo ioc, string previousFileVersion)
+		{
+			return false;
+		}
+
+		public string GetCurrentFileVersionFast(IOConnectionInfo ioc)
+		{
+			return null;
+		}
+
+		public Stream OpenFileForRead(IOConnectionInfo ioc)
+		{
+			return _ctx.ContentResolver.OpenInputStream(Android.Net.Uri.Parse(ioc.Path));
+		}
+
+		public IWriteTransaction OpenWriteTransaction(IOConnectionInfo ioc, bool useFileTransaction)
+		{
+			return new AndroidContentWriteTransaction(ioc.Path, _ctx);
+		}
+
+		public string GetFilenameWithoutPathAndExt(IOConnectionInfo ioc)
+		{
+			return "";
+		}
+
+		public bool RequiresCredentials(IOConnectionInfo ioc)
+		{
+			return false;
+		}
+
+		public void CreateDirectory(IOConnectionInfo ioc, string newDirName)
+		{
+			throw new NotImplementedException();
+		}
+
+		public IEnumerable<FileDescription> ListContents(IOConnectionInfo ioc)
+		{
+			throw new NotImplementedException();
+		}
+
+		public FileDescription GetFileDescription(IOConnectionInfo ioc)
+		{
+			throw new NotImplementedException();
+		}
+
+		public bool RequiresSetup(IOConnectionInfo ioConnection)
+		{
+			return false;
+		}
+
+		public string IocToPath(IOConnectionInfo ioc)
+		{
+			return ioc.Path;
+		}
+
+		public void StartSelectFile(IFileStorageSetupInitiatorActivity activity, bool isForSave, int requestCode, string protocolId)
+		{
+			Intent intent = new Intent();
+			activity.IocToIntent(intent, new IOConnectionInfo() { Path = protocolId + "://" });
+			activity.OnImmediateResult(requestCode, (int)FileStorageResults.FileChooserPrepared, intent);
+		}
+
+		public void PrepareFileUsage(IFileStorageSetupInitiatorActivity activity, IOConnectionInfo ioc, int requestCode,
+		                             bool alwaysReturnSuccess)
+		{
+			Intent intent = new Intent();
+			activity.IocToIntent(intent, ioc);
+			activity.OnImmediateResult(requestCode, (int)FileStorageResults.FileUsagePrepared, intent);
+		}
+
+		public void OnCreate(IFileStorageSetupActivity activity, Bundle savedInstanceState)
+		{
+			throw new NotImplementedException();
+		}
+
+		public void OnResume(IFileStorageSetupActivity activity)
+		{
+			throw new NotImplementedException();
+		}
+
+		public void OnStart(IFileStorageSetupActivity activity)
+		{
+			throw new NotImplementedException();
+		}
+
+		public void OnActivityResult(IFileStorageSetupActivity activity, int requestCode, int resultCode, Intent data)
+		{
+			throw new NotImplementedException();
+		}
+
+		public string GetDisplayName(IOConnectionInfo ioc)
+		{
+			return ioc.Path;
+		}
+
+		public string CreateFilePath(string parent, string newFilename)
+		{
+			throw new NotImplementedException();
+		}
+
+		public IOConnectionInfo GetParentPath(IOConnectionInfo ioc)
+		{
+			throw new NotImplementedException();
+		}
+
+		public IOConnectionInfo GetFilePath(IOConnectionInfo folderPath, string filename)
+		{
+			throw new NotImplementedException();
+		}
+	}
+
+	class AndroidContentWriteTransaction : IWriteTransaction
+	{
+		private readonly string _path;
+		private readonly Context _ctx;
+		private MemoryStream _memoryStream;
+
+		public AndroidContentWriteTransaction(string path, Context ctx)
+		{
+			_path = path;
+			_ctx = ctx;
+		}
+
+		public void Dispose()
+		{
+			_memoryStream.Dispose();
+		}
+
+		public Stream OpenFile()
+		{
+			_memoryStream = new MemoryStream();
+			return _memoryStream;
+		}
+
+		public void CommitWrite()
+		{
+			using (Stream outputStream = _ctx.ContentResolver.OpenOutputStream(Android.Net.Uri.Parse(_path)))
+			{
+				outputStream.Write(_memoryStream.ToArray(), 0, (int)_memoryStream.Length);
+			}
+			
+			
+		}
+	}
+
+	
+}

src/Kp2aBusinessLogic/Kp2aBusinessLogic.csproj

@@ -20,7 +20,7 @@
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>TRACE;DEBUG;EXCLUDE_TWOFISH;INCLUDE_KEYBOARD;EXCLUDE_FILECHOOSER;EXCLUDE_JAVAFILESTORAGE;EXCLUDE_KEYTRANSFORM</DefineConstants>
+    <DefineConstants>TRACE;DEBUG;EXCLUDE_TWOFISH;EXCLUDE_KEYBOARD;EXCLUDE_FILECHOOSER;EXCLUDE_JAVAFILESTORAGE;INCLUDE_KEYTRANSFORM</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
@@ -64,6 +64,7 @@
     <Compile Include="DataExchange\Formats\KeePassKdb2x.cs" />
     <Compile Include="DataExchange\Formats\KeePassXml2x.cs" />
     <Compile Include="DataExchange\PwExportInfo.cs" />
+    <Compile Include="Io\AndroidContentStorage.cs" />
     <Compile Include="Io\BuiltInFileStorage.cs" />
     <Compile Include="Io\CachingFileStorage.cs" />
     <Compile Include="Io\DropboxFileStorage.cs" />