I notice only now that the real problem seem to be here:
Qt Code: 
  1. public String read(String filesDir, String file){
  2.  
  3. 		 StringBuilder fileData = new StringBuilder(1000);		 
  4. 		 try {
  5. 			 BufferedReader  reader = new BufferedReader( new FileReader( new File(filesDir + "//" + file) ));
  6. 			 try {
  7. 				 char[] buf = new char[1024];
  8. 				 int numRead = 0;
  9. 				  while((numRead=reader.read(buf)) != -1){
  10. 					  fileData.append(buf, 0, numRead);
  11. 				  }
  12. 			 } finally { reader.close(); }
  13.  
  14. 		 } catch (IOException e) {
  15. 			System.out.println("file not found");
  16. 			System.exit(-1);
  17.  
  18. 		 }	
  19.  
  20.  
  21. 		return fileData.toString();
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on the "fileData.append(buf, 0, numRead);"
I've made a mistake: i have 2500 files to read.....
any suggestions?