changed to Google Play Services (ICS) component and up-to-date Support V4 library

src/Kp2aBusinessLogic/Io/AndroidContentStorage.cs

@@ -79,6 +79,11 @@ namespace keepass2android.Io
 			throw new NotImplementedException();
 		}
 
+		public void PrepareFileUsage(Context ctx, IOConnectionInfo ioc)
+		{
+		
+		}
+
 		public bool RequiresSetup(IOConnectionInfo ioConnection)
 		{
 			return false;

src/Kp2aBusinessLogic/Io/CachingFileStorage.cs

@@ -488,6 +488,11 @@ namespace keepass2android.Io
 			_cachedStorage.PrepareFileUsage(activity, ioc, requestCode, alwaysReturnSuccess || IsCached(ioc));
 		}
 
+		public void PrepareFileUsage(Context ctx, IOConnectionInfo ioc)
+		{
+			_cachedStorage.PrepareFileUsage(ctx, ioc);
+		}
+
 		public void OnCreate(IFileStorageSetupActivity activity, Bundle savedInstanceState)
 		{
 			_cachedStorage.OnCreate(activity, savedInstanceState);

src/Kp2aBusinessLogic/Io/JavaFileStorage.cs

@@ -249,6 +249,16 @@ namespace keepass2android.Io
 			_jfs.PrepareFileUsage(ctx, IocToPath(ioc));
 		}
 
+		public bool IsPermanentLocation(IOConnectionInfo ioc)
+		{
+			return true;
+		}
+
+		public bool IsReadOnly(IOConnectionInfo ioc)
+		{
+			return false; //TODO implement. note, however, that we MAY return false even if it's read-only
+		}
+
 		public void OnCreate(IFileStorageSetupActivity activity, Bundle savedInstanceState)
 		{
 			_jfs.OnCreate(((IJavaFileStorageFileStorageSetupActivity)activity), savedInstanceState);