[android-developers] display countup timer with milliseconds

I'm trying to create a countup timer with milliseconds.
I used Chronometer but I don't know how to display milliseconds.

Chronometer crono = (Chronometer) findViewById(R.id.chrono);
startTime = SystemClock.elapsedRealtime();
crono.setOnChronometerTickListener(new
OnChronometerTickListener() {
public void onChronometerTick(Chronometer arg0) {
countUp = (SystemClock.elapsedRealtime() -
arg0.getBase()) / 1000;
countUp_milli = (SystemClock.elapsedRealtime() -
arg0.getBase());
String asText = (countUp / 60) + ":" + (countUp %
60);
timeflg.setText(asText);
}
});

crono.start();

please tell me how to display milliseconds.

Thank you

Hassy

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