java - Android - More efficient method to read a big text file -

i've big txt file (1.5 mb) private resource in android application.
file structured this:

"a1|a2|a3|a4#b1|b2|b3|b4#c1|c2|c3|c4#..." 

where a1, a2, a3, b1... alphanumerical strings. need create object each group of strings, this:

myobject obja = new myobject("a1", "a2", "a3", "a4"); myobject objb = new myobject("b1", "b2", "b3", "b4"); ... 

i've developed reader class in order read file... looks bit slow.
here is:

public class textfilereader {      private static charset charset = charset.defaultcharset();     private inputstream stream;     private inputstreamreader reader;     private stringbuffer buffer;      public textfilereader(context c, string s) {         try {             this.stream = c.openfileinput(s);             this.reader = new inputstreamreader(this.stream, charset);             this.buffer = new stringbuffer();         } catch (filenotfoundexception e) {         }     }      public string readnextsubstring(char div) throws ioexception {         buffer.delete(0, buffer.length());         int i;         char c;         while ((i = reader.read()) > -1) {             c = (char) i;             if (c == div) break;             buffer.append(c);         }         return buffer.tostring();     } } 

i use textfilereader in way:

textfilereader reader = new textfilereader(context, "big_file.txt");  //first group string group = reader.readnextsubstring('#'); string[] info = group.split("\\|"); myobject obja = new myobject(info[0], info[1], info[2], info[3]);  //second group group = reader.readnextsubstring('#'); info = group.split("\\|"); myobject objb = new myobject(info[0], info[1], info[2], info[3]);  //obviously done in while loop :) ... 

what think method? structured in more efficient way?
don't care space, care time (the emulator takes lot of time in order read file)

i can find 1 simple tweak can speed improving how time spend on doing this: group.split("\\|");

the way java each time run line, compile new regex.

if this:

pattern pattern = pattern.compile("\\|"); textfilereader reader = new textfilereader(context, "big_file.txt");  while (reader.hasmoredata)  {   string group = reader.readnextsubstring('#');   string[] info = pattern.split(group);   myobject obja = new myobject(info[0], info[1], info[2], info[3]);   ... } 

this reduce time takes compile pattern - can quite considerable amount of data.

also, 1.5mb not much, perhaps loading memory using bufferedreader improve performance more.