logging - Filter Logs in Android programatically -

this method fetch , dump logs in sdcard android. working fine, wondering if can put filter trace logs related specific tags. idea ?

tried logcat -s *tagiwant; didn't work. other suggestion ?

public static void log(context context){ string filename = context.getexternalfilesdir(null).getpath() + file.separator + "my_app.log"; string command = "logcat -d *:v";  log.d(tag, "command: " + command);  try{ process process = runtime.getruntime().exec(command);  bufferedreader in = new bufferedreader(new inputstreamreader(process.getinputstream())); string line = null; try{     file file = new file(filename);     file.createnewfile();     filewriter writer = new filewriter(file);     while((line = in.readline()) != null){         writer.write(line + "\n");     }     writer.flush();     writer.close(); } catch(ioexception e){     e.printstacktrace(); } } catch(ioexception e){ e.printstacktrace(); } } 

try {                        process process = runtime.getruntime().exec("logcat -d");         bufferedreader bufferedreader = new bufferedreader(new inputstreamreader(process.getinputstream()));          string line;          pattern pattern = pattern.compile("xxx", 0);          while ((line = bufferedreader.readline()) != null) {             if (patternu != null                     && !pattern.matcher(line).find()) {                 continue;             }             log.append(line);             log.append('\n');         }      } catch (ioexception e) {      }