v0.6.3: several improvements to game file management:

- moved android savefile interaction out of core module
- decoupled save file names from hero classes (more work to do here)
- moved save files to individual folders
- added conversion logic for old saves

SPD-classes/src/main/java/com/watabou/utils/FileUtils.java

@@ -0,0 +1,138 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2015  Oleg Dolya
+ *
+ * Shattered Pixel Dungeon
+ * Copyright (C) 2014-2017 Evan Debenham
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package com.watabou.utils;
+
+import com.watabou.noosa.Game;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class FileUtils {
+	
+	// Files
+	
+	public static boolean fileExists( String name ){
+		File file = new File(Game.instance.getFilesDir(), name);
+		return file.exists() && !file.isDirectory();
+	}
+	
+	public static File getFile( String name ){
+		return getFile( Game.instance.getFilesDir(), name);
+	}
+	
+	public static File getFile( File base, String name ){
+		File file = new File(base, name);
+		if (!file.exists() || !file.isDirectory()){
+			return file;
+		}
+		return null;
+	}
+	
+	public static boolean deleteFile( String name ){
+		return Game.instance.deleteFile( name );
+	}
+	
+	public static boolean deleteFile( File file ){
+		return !file.isDirectory() && file.delete();
+	}
+	
+	
+	// Directories
+	
+	public static boolean dirExists( String name ){
+		File dir = new File(Game.instance.getFilesDir(), name);
+		return dir.exists() && dir.isDirectory();
+	}
+	
+	//base directory
+	public static File getDir( String name ){
+		return getDir( Game.instance.getFilesDir(), name);
+	}
+	
+	public static File getDir( File base, String name ){
+		File dir = new File(base, name);
+		if (!dir.exists() && dir.mkdirs()){
+			return dir;
+		} else if (dir.isDirectory()){
+			return dir;
+		}
+		return null;
+	}
+	
+	public static boolean deleteDir( String name ){
+		return deleteDir(getDir(name));
+	}
+	
+	public static boolean deleteDir( File dir ){
+		if (dir == null || !dir.isDirectory()){
+			return false;
+		}
+		
+		for (File f : dir.listFiles()){
+			if (f.isDirectory()){
+				if (!deleteDir(f)) return false;
+			} else {
+				if (!deleteFile(f)) return false;
+			}
+		}
+		
+		return dir.delete();
+	}
+	
+	// bundle reading
+	
+	//only works for base path
+	public static Bundle bundleFromFile( String fileName ) throws IOException{
+		return bundleFromStream(Game.instance.openFileInput( fileName ));
+	}
+	
+	public static Bundle bundleFromFile( File file ) throws IOException{
+		return bundleFromStream(new FileInputStream(file));
+	}
+	
+	private static Bundle bundleFromStream( InputStream input ) throws IOException{
+		Bundle bundle = Bundle.read( input );
+		input.close();
+		return bundle;
+	}
+	
+	// bundle writing
+	
+	//only works for base path
+	public static void bundleToFile( String fileName, Bundle bundle ) throws IOException{
+		bundleToStream( Game.instance.openFileOutput( fileName, Game.MODE_PRIVATE ), bundle);
+	}
+	
+	public static void bundleToFile( File file, Bundle bundle ) throws IOException{
+		bundleToStream( new FileOutputStream(file), bundle);
+	}
+	
+	private static void bundleToStream( OutputStream output, Bundle bundle ) throws IOException{
+		Bundle.write( bundle, output );
+		output.close();
+	}
+
+}