Question

I’m trying to make a stopwatch for android as part of a score board app the problem is I’m not sure how to use the chronometer to start, stop, then resume from the time it stopped at or reset to 0. The only problem is that I’m not sure how to use the setBase() and getBase() methods properly.

public class MainActivity extends Activity {

    int homecount, awaycount, minutes, seconds;
    TextView home, away;
    Button stop, start, reset, addhome, subhome, addaway, subaway;
    TextView time;
    public boolean running;


    Chronometer MyChronometer;
    long startTime, stopTime;
    running = false;
    stopTime = 0;
    MyChronometer = (Chronometer) findViewById(R.id.timer);

    start.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            ((Chronometer) findViewById(R.id.timer)).start();
            startTime=System.currentTimeMillis();
            running = true;
        }
    });

    stop.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            ((Chronometer) findViewById(R.id.timer)).stop();
            stopTime=System.currentTimeMillis();
            running = false;
        }
    });

    reset.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

        }
    });

Answer 1

You have the variable MyChronometer. Use that every time you want to start or stop.

Also, right after initialization you should run MyChronometer.setBase(SystemClock.elapsedRealtime());. For more details read the documentation: Chronometer and SystemClock.