How To Implement Chronometer In Android

In this post i'll going to share the problem when implementing chronometer in android application

Problem: I have one activity with three button START ,STOP and NEXT button.as name implies what they does so i don't need to explain about it to you.
i want to start second activity with the time as previous activity cover.It's one of toughest problem i have faced when try to implement this concept. so guys you don't need to panic i have attach code below. so before using chronometer you must have knowledge of SystemClock.

Note 1:
To start the chronometer  you should use the setBase() method of chronometer with SystemClock.elapsedRealTime().

mChronometer.setBase(SystemClock.elapsedRealTime());

Note 2:
To start chronometer at a specific time.you have to convert d time in millisecond.
At 3 minutes

mChronometer.setBase(SystemClock.elapsedRealTime()-3*60*1000);



*******FIRST ACTIVITY********
Chronometer mTimer;
int current_chronometer_state = 0;
long mStopWatchTimeSTS=0;

STEP 1: Within onCreate() method, i am using bundle to get time from second activity

Bundle bundle = getIntent().getExtras();
        if (bundle!= null)
            mStopWatchTimeSTS = bundle.getLong("STOP_WATCH_TIME");
            mTimer.setBase(SystemClock.elapsedRealtime()+mStopWatchTimeSTS);
        } else {
            mTimer.setBase(SystemClock.elapsedRealtime()+ mStopWatchTimeSTS);
           
        }

STEP 2: Code for START button

mTimer.setBase(SystemClock.elapsedRealtime()+ mStopWatchTimeSTS);
mTimer.start();
current_chronometer_state = 1;

STEP 3: Code for STOP button

mTimer.stop(); 00:20
mStopWatchTimeSTS = mTimer.getBase() - SystemClock.elapsedRealtime();
current_chronometer_state = 0;

STEP 4: Code for NEXT button
     if(current_chronometer_state == 1) {
            mTimer.stop();
            mStopWatchTimeSTS = mTimer.getBase() - SystemClock.elapsedRealtime();
            current_chronometer_state = 0;
        }

        Intent intent = new Intent(this, SecondTestSheet.class);
        Bundle bundle = new Bundle();
        bundle.putString("ACTUAL_TIME", mActualTime);
        bundle.putLong("STOP_WATCH",mStopWatchTimeSTS);
        intent.putExtras(bundle);
        startActivity(intent);


                                                     SECOND ACTIVITY

STEP 1: Within onCreate() method, i am using bundle to get time from first activity

long mPrevStopWatchTime=0;
int current_chronometer_state=0;
Note:get data from bundle

Bundle mExtra = getIntent().getExtras();
        if (mExtra != null) {
            mPrevStopWatchTime = mExtra.getLong("STOP_WATCH");
            sActualTime = mExtra.getString("ACTUAL_TIME");
            mChronometer.setBase(SystemClock.elapsedRealtime()+mPrevStopWatchTime);
   
        }else{
            mChronometer.setBase(SystemClock.elapsedRealtime()+mPrevStopWatchTime);
        }

STEP 2: Code for START button

mChronometer.start();
mChronometer.setBase(SystemClock.elapsedRealtime()+mPrevStopWatchTime);
current_chronometer_state=1;

STEP 3: Code for STOP button

mChronometer.stop();
mPrevStopWatchTime=mChronometer.getBase()-SystemClock.elapsedRealtime();
current_chronometer_state=0;

STEP 4: Code for BACKbutton
if(current_chronometer_state==1){
            mChronometer.stop();
            mPrevStopWatchTime=mChronometer.getBase()-SystemClock.elapsedRealtime();
            current_chronometer_state=0;
        }
  mChronometer.stop();
Intent intent=new Intent(context,FirstTestSheet.class);
        Bundle bundle=new Bundle();
        bundle.putLong("STOP_WATCH_TIME",mPrevStopWatchTime);
        intent.putExtras(bundle);
        startActivity(intent);


Chronometer Link