Chronometer stopwatch: Time keeps increasing in background when stop is pushed

Question

When I press the stop button it stops the time from being viewed but still increments in the background. When I press start it shows the entire time that it was stopped. Does anyone know how to make stop actually stop?

import android.app.Fragment;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Chronometer;

public class StopwatchFragment extends Fragment implements OnClickListener {


    public StopwatchFragment() {
        // Required empty public constructor
    }


    Button startChron;
    Button stopChron;
    Button resetChron;
    private Chronometer chron;



    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.fragment_stopwatch_main, container, false);
        getActivity().getActionBar()
                .setTitle("Stopwatch");
        startChron = (Button)v.findViewById(R.id.start);
               startChron.setOnClickListener(this);
        stopChron = (Button)v.findViewById(R.id.stop);
               stopChron.setOnClickListener(this);
        resetChron = (Button)v.findViewById(R.id.reset);
               resetChron.setOnClickListener(this);
        chron = (Chronometer) v.findViewById(R.id.chronometer);
        return v;


    }

    @Override
    public void onClick(View v) {
        if (v == startChron){
            chron.start();
        }
        else if (v == stopChron){
            chron.stop();
        }
        else if (v == resetChron){
            chron.setBase(SystemClock.elapsedRealtime());
        }
    }
}

"but still increments in the background" - how do you know that ? — Shadab Ansari, Apr 11 '16 at 20:31
@ShadabAnsari say I press start it goes to 5 seconds and I press stop and I leave it stopped for 3 seconds. When I press start the timer automatically updates to 8 seconds. — user2980816, Apr 11 '16 at 20:35

David Guerrero · Answer 1 · 2016-04-12T10:12:05.980

1

You're going to have to save in a variable the time when the chrono is paused. Something like this:

difference = chron.getBase() - SystemClock.elapsedRealtime();

And then to set the time when resume:

time = timeDifference + SystemClock.elapsedRealtime()

edited Apr 12 '16 at 10:12

answered Apr 11 '16 at 20:51

David Guerrero

1,080
7
7

But I'm not trying to fully reset the clock. I just want it to pick up where it left off. I called chron.setBase(SystemClock.elapsedRealtime()); in the reset function – user2980816 Apr 11 '16 at 23:45
@user2980816 I edited the answer based in your comment. ;) – David Guerrero Apr 20 '16 at 08:04

score 0 · Answer 2 · answered Apr 11 '16 at 20:38

0

It is because calling stop() doesn't changes your Chronometer base as set using setBase(). If you want to make your Chronometer start afresh, then everytime you call start() you need to setBase() before it.

chron.setBase(SystemClock.elapsedRealtime());

Check this.

answered Apr 11 '16 at 20:38

Shadab Ansari

7,022
2
27
45

1

But I'm not trying to fully reset the clock. I just want it to pick up where it left off. I called chron.setBase(SystemClock.elapsedRealtime()); in the reset function – user2980816 Apr 11 '16 at 23:44
You have to setBase() before start(). – Shadab Ansari Apr 11 '16 at 23:45

Chronometer stopwatch: Time keeps increasing in background when stop is pushed

2 Answers2