/**
	 * 备份短信
	 * 
	 * @param context
	 */
	public static void backupSms(Context context,BackupProcess backupProcess) {
		ContentResolver resolver = context.getContentResolver();
		Uri uri = Uri.parse("content://sms/");
		Cursor cursor = resolver.query(uri,new String[] { "address","date","type","body" },null,null);
		
		backupProcess.backupMax(cursor.getCount());
		XmlSerializer serializer = Xml.newSerializer();
		File file = new File(Environment.getExternalStorageDirectory(),"backup.xml");
		BufferedOutputStream bos = null;
		try {
			bos = new BufferedOutputStream(new FileOutputStream(file));
			serializer.setOutput(bos,"utf-8");
			serializer.startDocument("utf-8",true);
			serializer.startTag(null,"smss");
			
			int pd_progress = 0;
			
			while (cursor.moveToNext()) {
				Thread.sleep(500);
				serializer.startTag(null,"sms");
				serializer.startTag(null,"address");
				String address = cursor.getString(0);
				serializer.text(address);
				serializer.endTag(null,"address");

				serializer.startTag(null,"date");
				String date = cursor.getString(1);
				serializer.text(date);
				serializer.endTag(null,"date");

				serializer.startTag(null,"type");
				String type = cursor.getString(2);
				serializer.text(type);
				serializer.endTag(null,"type");

				serializer.startTag(null,"body");
				String body = cursor.getString(3);
				serializer.text(body);
				serializer.endTag(null,"body");

				serializer.endTag(null,"sms");
				pd_progress++;
				backupProcess.backupProcess(pd_progress);
			}
			cursor.close();
			serializer.endTag(null,"smss");
			serializer.endDocument();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalStateException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (InterruptedException e) {
			e.printStackTrace();
		} finally {
			if (bos != null) {
				try {
					bos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}