android - SD-Card-> Missing value -


really need help. 1 week i'am trying save (raw-)data(-bytes) correctly sd-card of android phone.

the mobile data via bluetooth microcontroller. data printed out correctly terminal, java-code incorrect.

for testing this, variable (8bit) incrementing , after step value of variable sending phone. when read out created file hex-view, there lot of zeros between guilty values ( in case: µc not sending anything) , reason there lot of values missing / maybe chronology wrong.

the saving part: 

h=new handler() {     public void handlemessage (android.os.message msg) {         switch (msg.what) {         case recieve_message:             byte[] readbuf = (byte[]) msg.obj;             string path = "/sdcard/" + dateipfad.gettext().tostring() + ".txt";             environment.getexternalstoragedirectory().getpath();              try {                 file myfile = new file(path);                 myfile.createnewfile();                 fileoutputstream fout = new fileoutputstream(myfile,true);                  fout.write(readbuf);                 fout.flush();                 fout.close();             } catch (exception e) {                 toast.maketext(getbasecontext(), e.getmessage(),                                toast.length_short).show();             }              break;         }     } };

`

you're not extracting data out of message.
msg.getdata.getbytearray("keyofthemessage");


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