Android常用功能之短信备份

用ContentResolver来完成此功能,，备份短信(初步功能是每次全部都备份到xml文件中,不管xml文件是否已存在备份,可以备份短信的id到里面去。这样取出短信id一一比较，不是j旧的备份到里面去,对xml进行追写)

private static int index;
 private static FileOutputStream fs;

 public static void smsBackup(Context context, String path, ProgressDialog pd) {
     index=0;
     File file = new File(path);
     Cursor cursor = context.getContentResolver().query(Uri.parse("content://sms"),
             new String[]{"address", "date", "type", "body"}, null, null, null);
     pd.setMax(cursor.getCount());
     try {
         fs = new FileOutputStream(file);

         XmlSerializer serializer = Xml.newSerializer();
         serializer.setOutput(fs, "utf-8");
         serializer.startDocument("utf-8", true);
         serializer.startTag(null,"smss");
         while(cursor.moveToNext())
         {
             serializer.startTag(null,"sms");

             serializer.startTag(null,"address");
             serializer.text(cursor.getString(0));
             serializer.endTag(null,"address");

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

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

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

             serializer.endTag(null,"sms");
             //设置进度条框
             index++;
             pd.setProgress(index);
         }
         serializer.endTag(null,"smss");
         serializer.endDocument();
     } catch (Exception e) {
         e.printStackTrace();
     }
     finally {
         if(cursor!=null&&fs!=null) {
             cursor.close();
             try {
                 fs.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }