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Countdown Timer sometime, counts 2 seconds before the actual time

I have tried to make an countdown timer in a list veiw implementation. Each list item has a separate countdown timer that can be started or stopped. However I have noticed that if I add the first timer in list and set its time. When I start the timer it starts two seconds less than the actual time. e.g If I added a count down of 12 seconds. Then it will start counting from 10. But when the countdown is taking place and I add another new timer and set its time, it starts on the exact given time. The new counter starts at the wrong time only when either there is no other counter in the list or when all counters are already stopped and not counting down. Similarly it will only start the right time only when other timers are counting down. Would really appreciate if someone can help me figure out where is the problem. I have been looking at the code for days.
Here's my Adapter class
public class CustomAdapterCounter extends ArrayAdapter<CounterData> {
private final LayoutInflater mInflater;
Context context;
Uri sound = Uri.parse("android.resource://com.tattooalarmclock.free/" + R.raw.counter);
String counterString = "";
private List<ViewHolder> lstHolders;
private List<CounterData> list = new ArrayList<CounterData>();
private Handler mHandler = new Handler();
private Runnable updateRemainingTimeRunnable = new Runnable() {
#Override
public void run() {
synchronized (lstHolders) {
long currentTime = System.currentTimeMillis();
for (ViewHolder holder : lstHolders) {
// if(!holder.counterData.isStopped)
holder.updateTimeRemaining(System.currentTimeMillis());
}
}
}
};
public CustomAdapterCounter(Context context, List<CounterData> l) {
super(context, 0, l);
this.context = context;
lstHolders = new ArrayList<>();
list = l;
mInflater = LayoutInflater.from(context);
for(int i=0; i<list.size(); i++) {
CounterData[] array = list.toArray(new CounterData[list.size()]);
if(!array[i].isStopped)
startUpdateTimer();
}
}
public double getScreenSize() {
DisplayMetrics dm = new DisplayMetrics();
WindowManager windowManager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels;
int height = dm.heightPixels;
int dens = dm.densityDpi;
double wi = (double) width / (double) dens;
double hi = (double) height / (double) dens;
double x = Math.pow(wi, 2);
double y = Math.pow(hi, 2);
double screenInches = Math.sqrt(x + y);
return screenInches;
}
private void startUpdateTimer() {
Timer tmr = new Timer();
tmr.schedule(new TimerTask() {
#Override
public void run() {
mHandler.post(updateRemainingTimeRunnable);
}
}, 1000, 1000);
}
public static <T> List<T> stringToArray(String s, Class<T[]> clazz) {
T[] arr = new Gson().fromJson(s, clazz);
return Arrays.asList(arr); //or return Arrays.asList(new Gson().fromJson(s, clazz)); for a one-liner
}
public boolean getListSharedPreferences() {
SharedPreferences sharedPreferences = context.getSharedPreferences("com.example.app", Context.MODE_PRIVATE);
if (sharedPreferences.getString("CL", null) != null) {
counterString = sharedPreferences.getString("CL", null);
Gson gson = new Gson();
TypeToken<List<CounterData>> token = new TypeToken<List<CounterData>>() {};
list = gson.fromJson(counterString, token.getType());
return true;
}
else
return false;
}
public void saveListSharedPreferences(List counterList) {
Gson gson = new Gson();
counterString = gson.toJson(counterList);
SharedPreferences sharedPreferences = context.getSharedPreferences("com.example.app", Context.MODE_PRIVATE);
sharedPreferences.edit().putString("CL", counterString).commit();
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
if(getScreenSize() <= 4 )
convertView = mInflater.inflate(R.layout.list_view_counter_small, parent, false);
else
convertView = mInflater.inflate(R.layout.list_view_item_counter, parent, false);
holder.counterTextView = (TextView) convertView.findViewById(R.id.counterTextView);
holder.stopCounter = (Button) convertView.findViewById(R.id.counterStopInList);
holder.startCounter = (Button) convertView.findViewById(R.id.counterStartInList);
holder.deleteCounter = (Button) convertView.findViewById(R.id.deleteCounter);
convertView.setTag(holder);
synchronized (lstHolders) {
lstHolders.add(holder);
}
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.setData2(getItem(position));
final ViewHolder finalHolder = holder;
holder.stopCounter.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
long store = finalHolder.counterData.expirationTime - System.currentTimeMillis();
finalHolder.counterData.isStopped = true;
finalHolder.counterData.expirationTime = store;
finalHolder.stopCounter.setEnabled(false);
finalHolder.stopCounter.getBackground().setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);
finalHolder.startCounter.setEnabled(true);
finalHolder.startCounter.getBackground().setColorFilter(null);
list.set(position, finalHolder.counterData);
saveListSharedPreferences(list);
/* if(getListSharedPreferences()) {
System.out.println("List before change in stop button " + list.toString());
list = stringToArray(counterString, CounterData[].class);
list.set(position, finalHolder.counterData);
System.out.println("List before change in stop button " + list.toString());
saveListSharedPreferences(list);
}
else {
System.out.println(list.toString());
list.set(position, finalHolder.counterData);
System.out.println(list.toString());
saveListSharedPreferences(list);
}
*/
}
});
holder.startCounter.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finalHolder.counterData.expirationTime = System.currentTimeMillis() + finalHolder.counterData.expirationTime;
finalHolder.counterData.isStopped = false;
//finalHolder.counterData.expirationTime = System.currentTimeMillis() + finalHolder.counterData.expirationTime;
//finalHolder.setData(finalHolder.counterData);
finalHolder.startCounter.setEnabled(true);
finalHolder.startCounter.getBackground().setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);
finalHolder.stopCounter.setEnabled(true);
finalHolder.stopCounter.getBackground().setColorFilter(null);
list.set(position, finalHolder.counterData);
saveListSharedPreferences(list);
startUpdateTimer();
/* if(getListSharedPreferences()) {
list = stringToArray(counterString, CounterData[].class);
System.out.println("List before change in start button " + list.toString());
list.set(position, finalHolder.counterData);
System.out.println("List after change in start button " + list.toString());
saveListSharedPreferences(list);
}
else {
list.set(position, finalHolder.counterData);
saveListSharedPreferences(list);
} */
}
});
final ViewHolder finalHolder1 = holder;
holder.deleteCounter.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
/* if(finalHolder1.mediaPlayer.isPlaying()) {
finalHolder.mediaPlayer.stop();
// finalHolder.counterData.isSoundPlayedBefore = true;
} */
list.remove(position);
notifyDataSetChanged();
saveListSharedPreferences(list);
}
});
return convertView;
}
}
class ViewHolder {
public TextView counterTextView;
//public List<Long> l;
CounterData counterData;
Button startCounter;
Button stopCounter;
Button deleteCounter;
boolean stop = false;
long timeDiff;
// Context context;
// MediaPlayer mediaPlayer;
// List<CounterData> counterDataList;
public void setData(CounterData item) {
counterData = item;
updateTimeRemaining(System.currentTimeMillis());
}
public void setData2(CounterData item) {
counterData = item;
updateTimeRemaining(System.currentTimeMillis());
}
public void updateTimeRemaining(long currentTime) {
if (!counterData.isStopped) {
timeDiff = counterData.expirationTime - currentTime;
//System.out.println("Time Diff Inside Method " + timeDiff);
if (timeDiff > 0) {
int seconds = (int) (timeDiff / 1000) % 60;
int minutes = (int) ((timeDiff / (1000 * 60)) % 60);
int hours = (int) TimeUnit.MILLISECONDS.toHours(timeDiff);
counterTextView.setText(hours + "H " + minutes + "M " + seconds + "S");
stopCounter.setEnabled(true);
stopCounter.getBackground().setColorFilter(null);
startCounter.setEnabled(false);
startCounter.getBackground().setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);
} else {
counterTextView.setText("Times Up");
startCounter.setEnabled(false);
startCounter.getBackground().setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);
stopCounter.setEnabled(false);
stopCounter.getBackground().setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);
// Vibrator v = (Vibrator) this.context.getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for 500 milliseconds
// v.vibrate(5000);
/* if(!counterData.isSoundPlayedBefore) {
mediaPlayer.start();
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mp) {
mediaPlayer.stop();
}
});
counterData.isSoundPlayedBefore = true;
if(findIndex(counterData) != -1) {
int index = findIndex(counterData);
counterDataList.set(index,counterData);
saveListSharedPreferences(counterDataList);
}
} */
}
}
else {
long store = counterData.expirationTime + System.currentTimeMillis() - currentTime;
int seconds = (int) (store / 1000) % 60;
int minutes = (int) ((store / (1000 * 60)) % 60);
int hours = (int) TimeUnit.MILLISECONDS.toHours(store);
counterTextView.setText(hours + "H " + minutes + "M " + seconds + "S");
startCounter.setEnabled(true);
startCounter.getBackground().setColorFilter(null);
stopCounter.setEnabled(false);
stopCounter.getBackground().setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);
}
}
}
And here's my CounterData class
class CounterData {
long expirationTime;
boolean isStopped;
boolean isSoundPlayedBefore;
int id;
public CounterData(long expirationTime, int id) {
this.expirationTime = expirationTime;
isStopped = true;
isSoundPlayedBefore = false;
this.id = id;
}
public String toString() {
return String.valueOf("Remaining Time: " + TimeUnit.MILLISECONDS.toMinutes(this.expirationTime) + ":" + TimeUnit.MILLISECONDS.toSeconds(this.expirationTime));
}
public void setCounterID(int id) {
this.id = id;
}
public int getCounterID() {
return this.id;
}
}
And I add the time from number pickers of Hour, Minute and Second.
case R.id.counterStartStopButton:
long hour = TimeUnit.HOURS.toMillis(numberPickerHour.getValue());
long minute = TimeUnit.MINUTES.toMillis(numberPickerMinute.getValue());
long second = TimeUnit.SECONDS.toMillis(numberPickerSecond.getValue());
// if(getListSharedPreferences()) {
if(getCounterIDSharedPreferences()) {
counterID = counterID + 1;
list.add(new CounterData(hour + minute + second, counterID));
saveCounterIDSharedPreferences(counterID);
}
else {
counterID = 1;
list.add(new CounterData(hour + minute + second, counterID));
saveCounterIDSharedPreferences(counterID);
}
UPDATE
Here's the shared preferences code
public void saveCounterIDSharedPreferences(int id) {
SharedPreferences sharedPreferences = this.getSharedPreferences("com.example.app", Context.MODE_PRIVATE);
sharedPreferences.edit().putInt("Counter ID123", id).commit();
}
public boolean getCounterIDSharedPreferences() {
SharedPreferences sharedPreferences = this.getSharedPreferences("com.example.app", Context.MODE_PRIVATE);
if (sharedPreferences.getInt("Counter ID123", -1) != -1) {
counterID = sharedPreferences.getInt("Counter ID123", -1);
return true;
}
else
return false;
}

What turned out to work for me was changing the timer task as following:
private void startUpdateTimer() {
Timer tmr = new Timer();
tmr.schedule(new TimerTask() {
#Override
public void run() {
mHandler.post(updateRemainingTimeRunnable);
}
}, 500, 500);
}

Android Chronometer - Save time

I´m using a Chronometer in my Android App. I can start it, stop it and continue counting after pushing the start button again:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_projektbeschreibung, container, false);
if (savedInstanceState != null){
stoppedmillis = savedInstanceState.getLong(STATE_TIME);
hh = savedInstanceState.getString(STATE_HH);
mm = savedInstanceState.getString(STATE_MM);
ss = savedInstanceState.getString(STATE_SS);
}
mChronometer = (Chronometer) rootView.findViewById(R.id.chronometer2);
mChronometer.setText(hh + ":" + mm + ":" + ss);
mChronometer.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
#Override
public void onChronometerTick(Chronometer cArg) {
long time = SystemClock.elapsedRealtime() - cArg.getBase() ;
int h = (int) (time / 3600000);
int m = (int) (time - h * 3600000) / 60000;
int s = (int) (time - h * 3600000 - m * 60000) / 1000;
hh = h < 10 ? "0" + h : h + "";
mm = m < 10 ? "0" + m : m + "";
ss = s < 10 ? "0" + s : s + "";
cArg.setText(hh + ":" + mm + ":" + ss);
}
});
((Button) rootView.findViewById(R.id.startbutton)).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//if first start
if(stoppedmillis == 0) {
mChronometer.setBase(SystemClock.elapsedRealtime());
} else {//Point A
long pausetime = (SystemClock.elapsedRealtime() - stoppedmillis);
mChronometer.setBase(mChronometer.getBase() + pausetime);
}
mChronometer.start();
}
});
((Button) rootView.findViewById(R.id.stopbutton)).setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
mChronometer.stop();
stoppedmillis = SystemClock.elapsedRealtime();
}
});
After a screen rotation (so the Activity restarts) the chronometer starts counting from the point of 00:00:00 again. My first try was to save the stoppedmillis with a onSaveInstanceState method like the following:
public void onSaveInstanceState(Bundle savedInstanceState){
savedInstanceState.putLong(STATE_TIME, stoppedmillis);
savedInstanceState.putString(STATE_HH, hh);
savedInstanceState.putString(STATE_MM, mm);
savedInstanceState.putString(STATE_SS,ss);
super.onSaveInstanceState(savedInstanceState);
}
Now, I can get the value of the stoppedmillis after a restart, but I don't know how to set the Base for the Chronometer with the help of the stoppedmillis. At Point A in the Code you can see how it works with stopping the Chronometer with a button but this part of code does not working after a screen rotation.

I know that this is old. Although, I have created a simple application using a chronometer and done the following and it has kept counting across screen rotation. It is spot on with Andrew's original answer. Here is how I outlined it:
Chronometer mChronometer; // this is a global variable
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mChronometer = (Chronometer)findViewById(R.id.chronometer);
if(savedInstanceState != null){
mChronometer.setBase(savedInstanceState.getLong("ChronoTime"));
mChronometer.start();
}
}
Now set up onSaveInstanceState:
#Override
public void onSaveInstanceState (Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putLong("ChronoTime", mChronometer.getBase());
}

Fast solution, using this class:
https://github.com/ahmedrizwan/ChronometerPersist/blob/master/chronometerpersist/src/main/java/library/minimize/com/chronometerpersist/ChronometerPersist.java
ChronometerPersist chronometerPersist = ChronometerPersist.getInstance(chronometer, sharedPreferences);
//Starting the chronometer
startChronometer();
//Stoping the chronometer
stopChronometer();
//Pausing the chronometer
pauseChronometer();
I have lost much time trying to restore the current time with the android chronometer widget.

This is how i solved saving the state of the Chronometer.
private static final int TIME_MULTIPLIER = 60;
Step 1: Convert time to Seconds:
NOTE: If you don't like my method of converting time to second you could do your ways.
private static int convertTimeToSeconds(Long... time) {
int seconds = 0;
if (time.length == 2) {
seconds += time[0] * TIME_MULTIPLIER + time[1];
} else if (time.length == 3) {
seconds += (time[0] * TIME_MULTIPLIER) + (time[1] * TIME_MULTIPLIER) + (time[2]);
}
return seconds;
}
Step 2: Setting and starting time of Chronometer
NOTE: I'm saving the data in a custom object persist that object with any database / SharedPreference / your wish.
public static void setAndStartTime(final Chronometer chronometer) {
long second = 0;
// i have multiple time saved into map. You could save just 1 time and reuse that time.
for (DailyData data : DailyData.DailyDataHolder.getDailyDataMap().values()) {
second += data.getDailyTimeSpent();
}
chronometer.setBase(SystemClock.elapsedRealtime() - (second * 1000));
chronometer.start();
}
Step 3: Saving Time:
public static void saveTime(String timeText) {
String[] timeParts = timeText.split("[:]");
long savedTime = 0;
if (timeParts.length == 2) {
savedTime = convertTimeToSeconds(Long.parseLong(timeParts[0]), Long.parseLong(timeParts[1]));
} else if (timeParts.length == 3) {
savedTime = convertTimeToSeconds(Long.parseLong(timeParts[0]), Long.parseLong(timeParts[1]), Long.parseLong(timeParts[2]));
}
DailyData.DailyDataHolder.getDailyData().setDailyTimeSpent(savedTime);
}
Calling the saved method:
ChronoHelper.saveTime(chronometer.getText().toString());
COMPLETE CLASS:
public class ChronoHelper {
private static final int TIME_MULTIPLIER = 60;
public static void setAndStartTime(final Chronometer chronometer) {
long second = 0;
for (DailyData data : DailyData.DailyDataHolder.getDailyDataMap().values()) {
second += data.getDailyTimeSpent();
}
chronometer.setBase(SystemClock.elapsedRealtime() - (second * 1000));
chronometer.start();
}
public static void saveTime(String timeText) {
String[] timeParts = timeText.split("[:]");
long savedTime = 0;
if (timeParts.length == 2) {
savedTime = convertTimeToSeconds(Long.parseLong(timeParts[0]), Long.parseLong(timeParts[1]));
} else if (timeParts.length == 3) {
savedTime = convertTimeToSeconds(Long.parseLong(timeParts[0]), Long.parseLong(timeParts[1]), Long.parseLong(timeParts[2]));
}
DailyData.DailyDataHolder.getDailyData().setDailyTimeSpent(savedTime);
}
private static int convertTimeToSeconds(Long... time) {
int seconds = 0;
if (time.length == 2) {
seconds += time[0] * TIME_MULTIPLIER + time[1];
} else if (time.length == 3) {
seconds += (time[0] * TIME_MULTIPLIER) + (time[1] * TIME_MULTIPLIER) + (time[2]);
}
return seconds;
}
public static String secondsToTimeText(DailyData dailyData) {
long savedSeconds = dailyData.getDailyTimeSpent();
long minutes = savedSeconds / TIME_MULTIPLIER;
long seconds = savedSeconds % TIME_MULTIPLIER;
long hours = minutes / TIME_MULTIPLIER;
return hours + ":" + minutes + ":" + seconds;
}
}

Save the base time of the chronometer in onSaveInstanceState and set it back in onRestoreInstanceState like this:
public void onSaveInstanceState(Bundle savedInstanceState) {
savedInstanceState.putLong("ChronoTime", mChronometer.getBase());
super.onSaveInstanceState(savedInstanceState);
}
public void onRestoreInstanceState(Bundle savedInstanceState){
if((savedInstanceState !=null) && savedInstanceState.containsKey("ChronoTime"))
mChronometer.setBase(savedInstanceState.getLong("ChronoTime"));
super.onRestoreInstanceState(savedInstanceState);
}

CountDownTimer not working properly

for (int i=0; i<HisXArray.size(); i++) {
ycoord2 = HisYArray.get(i);
major2 = HisMajorArray.get(i);
xcoord2 = HisXArray.get(i);
minor2 = HisMinorArray.get(i);
time3 = TimeArray.get(i);
timer = new CountDownTimer(time3, 1000) {
#Override
public void onFinish() {
Log.e("Timer", xcoord2 + " " + ycoord2 + " " + time3);
mView.mFadePaint.setColor(Color.BLACK);
mView.drawOval(mView.mCanvas, xcoord2, ycoord2, 2*major2, 2*minor2, mView.mFadePaint);
mView.invalidate();
}
#Override
public void onTick(long millisUntilFinished) {
// TODO Auto-generated method stub
}
}.start();
When I'm trying to draw something using timer, onFinish called only when time3 = 0 and when i = HisXArray.size() - 1, i.e. the last.

Implement any intermediate steps in onTick(). By design, onFinish() is only called when the countdown is complete.

Count down timer in android

I am new to android.I am having an app which can be used for exam management.Users can insert the date of every subjects and the app will provide time(in hours) for each subject.There is countdown timer which will start from the time allocated for each subject(for eg,48 hours) and should go to zero.when it hits zero an alarm should be played showing that time allocated for that subject has got over.this is my code.
public class Alarmpage extends Activity{
TextView hourshow,minshow,secshow;
SQLiteDatabase database_read;
sampleDatabase samp;
Cursor cur;
Handler handler;
int initStart;
Runnable updater;
int t;
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.alarm);
hourshow=(TextView)findViewById(R.id.hr);
samp=new sampleDatabase(getApplicationContext());
database_read=samp.getReadableDatabase();
minshow=(TextView)findViewById(R.id.min);
secshow=(TextView)findViewById(R.id.sec);
cur=database_read.query(sampleDatabase.TABLE_SEC, null, null, null, null, null, null);
}
public void onResume() {
super.onResume();
if(cur.moveToFirst())
{
t=cur.getInt(3);
Log.e("time", String.valueOf(t));
}
handler=new Handler();
initStart = (int) SystemClock.elapsedRealtime();
Log.e("init", String.valueOf(initStart));
updater = new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
int sec,minute,hour;
int diff = t*60*60;
Log.e("time in sec", String.valueOf(diff));
System.out.println(diff);
/*if(diff>=1)
{
hour= diff/3600;
}
else {hour = 00; }
hourshow.setText(String.valueOf(hour));
Log.e("diff after hour", String.valueOf(diff));
Log.e("hour", String.valueOf(hour));
minute = (diff % 3600) / 60;
minshow.setText(":"+String.valueOf(minute));
sec= (diff % 60);
secshow.setText(":"+String.valueOf(sec));*/
if (diff >= 1) {
sec = (int) (diff%60);
} else {
sec=00;
}
secshow.setText(":"+String.valueOf(sec));
diff = diff/60;
if (diff >= 1) {
minute = (int) (diff%60);
} else {
minute=00;
}
minshow.setText(":"+String.valueOf(minute));
diff = diff/60;
if (diff >= 1) {
hour = (int) (diff%24);
} else {hour = 00; }
hourshow.setText(String.valueOf(hour));
t=(t*60*60)-1;
handler.postDelayed(this, 1000);
}
};
handler.post(updater);
}
#Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
handler.removeCallbacks(updater);
}
}
but its showing some values.but they are not correct.kindly help me.I dont understand error in this code.Thanks in advance

Activity State not saved

I want to save my Activity state while I swipe between activities but I cannot. Some things are saved and the others dont. I think it has to do somehow with the gestureListener I'm impementing but I'm not sure.
When I swipe to a different activity and then back to this one - the AsyncTask is still running and the Handler is still updating the GUI, however, the views I have displaying in this activity and the buttons are all in their initial configuration.
what am I doing wrong?
public class Main extends Activity implements OnClickListener,
SimpleGestureListener {
/** Called when the activity is first created. */
static String checkedIN = "";
private int hoursSum;
private int minutesSum;
static int dayIs;
static String madeSoFar = "";
static int hoursCount = 0;
static String formattedSeconds = "";
static String formattedMinutes = "";
public static NumberFormat formatter = new DecimalFormat("#0.00");
static boolean killcheck = false;
static String time = "";
static Handler mHandler;
private boolean clicked = false;
private boolean wasShift = false;
static String startString;
static String finishString;
private SimpleGestureFilter detector;
private Typeface tf, tf2, roboto;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
// **************** Set Fonts **************
roboto = Typeface.createFromAsset(getAssets(), "fonts/robotothin.ttf");
tf = Typeface.createFromAsset(getAssets(), "fonts/Advert.ttf");
tf2 = Typeface.createFromAsset(getAssets(), "fonts/passion.ttf");
// **************** Gesture implementation ************
detector = new SimpleGestureFilter(this, this);
// **************** Date and Time Objects *************
final Date date = new Date();
final Date today = Calendar.getInstance().getTime();
DateFormat DF = new SimpleDateFormat("dd/MM/yyyy");
final String DateInString = DF.format(today);
String myString = DateFormat.getDateInstance().format(date);
final TextView dateDisplay = (TextView) findViewById(R.id.dateDisplay);
dateDisplay.setText(myString);
final DBAdapter DB = new DBAdapter(this);
// ************* Apply custom fonts ***************
TextView Title = (TextView) findViewById(R.id.textView2);
Title.setTypeface(tf);
final TextView Author = (TextView) findViewById(R.id.textView3);
Author.setTypeface(roboto);
TextView Current = (TextView) findViewById(R.id.textView1);
Current.setTypeface(roboto);
DigitalClock DG = (DigitalClock) findViewById(R.id.digitalClock1);
DG.setTypeface(roboto);
TextView dater = (TextView) findViewById(R.id.date);
dater.setTypeface(roboto);
TextView dateDisp = (TextView) findViewById(R.id.dateDisplay);
dateDisp.setTypeface(roboto);
CheckedTextView CV = (CheckedTextView) findViewById(R.id.radioButton1);
CV.setTypeface(roboto);
// *************************************************//
final Button checkIn = (Button) findViewById(R.id.CheckIn);
checkIn.setTypeface(roboto);
CheckedTextView check = (CheckedTextView) findViewById(R.id.radioButton1);
Boolean enable = false;
check.setEnabled(enable);
mHandler = new Handler() {
public void handleMessage(Message msg) {
time = "Time: " + hoursCount + ":" + formattedMinutes + ":"
+ formattedSeconds + " Money: " + madeSoFar;
Author.setText(time);
}
};
// **************** Click Listener for first Check In Button
checkIn.setOnClickListener(new OnClickListener() {
int startHours;
int startMinutes;
int finishHours;
int finishMinutes;
#Override
public void onClick(View v) {
// Check Out
if (clicked == true) {
killcheck = true;
checkedIN = "Check In";
checkIn.setText(checkedIN);
finishHours = Utility.getHoursTime();
finishMinutes = Utility.getMinutesTime();
finishString = Integer.toString(Utility.getHoursTime())
+ ":" + Integer.toString(Utility.getMinutesTime())
+ " -";
clicked = false;
wasShift = true;
hoursSum = finishHours - startHours;
minutesSum = finishMinutes - startMinutes;
// Check In
} else if (clicked == false) {
checkedIN = "Check Out";
checkIn.setText(checkedIN);
killcheck = false;
new ShiftProgress().execute();
startHours = Utility.getHoursTime();
startMinutes = Utility.getMinutesTime();
startString = Integer.toString(Utility.getHoursTime())
+ ":" + Integer.toString(Utility.getMinutesTime())
+ " -";
String s = "In Shift ";
CheckedTextView radio = (CheckedTextView) findViewById(R.id.radioButton1);
radio.setText(s);
clicked = true;
}
}
});
Button addShift = (Button) findViewById(R.id.addShift);
addShift.setTypeface(tf2);
// **************** On click listener for adding a shift
addShift.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if (wasShift == true) {
changeDateToString(DateInString);
DB.open();
final Cursor cursor = DB.getAllShifts();
startManagingCursor(cursor);
cursor.moveToLast();
int count = cursor.getPosition();
final int position = count + 2;
cursor.moveToNext();
GregorianCalendar GC = new GregorianCalendar();
DB.addToDBTotal(DateInString, "Money: " + madeSoFar,
hoursSum, minutesSum,
Utility.getDay(GC.get(Calendar.DAY_OF_WEEK)),
position, startString, finishString);
DBAdapter.close();
wasShift = false;
printAny(getApplicationContext(), "Added to Shifts",
Toast.LENGTH_SHORT);
} else {
printAny(getApplicationContext(), "Please Check In First", Toast.LENGTH_SHORT);
}
}
});
}
// **************** METHOD DECLERATIONS ****
public void viewShifts() {
Intent myIntent = new Intent(Main.this, Shifts.class);
startActivity(myIntent);
}
public void changeDateToString(String s) {
Utility.INSTANCE.setDate(s);
}
public void changeDurationToString(String s) {
Utility.INSTANCE.setDuration(s);
}
public void printAny(Context c, CharSequence s, int i) {
Context context = c;
CharSequence text = s;
final int duration = i;
Toast toast = Toast.makeText(context, text, duration);
toast.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER, 0, 0);
toast.show();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.exit:
System.exit(1);
DBAdapter.close();
return true;
case R.id.view:
viewShifts();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
#Override
public void onSwipe(int direction) {
Intent intent = new Intent();
switch (direction) {
case SimpleGestureFilter.SWIPE_RIGHT:
intent.setClass(this, Shifts.class);
startActivity(intent);
break;
case SimpleGestureFilter.SWIPE_LEFT:
intent.setClass(this, Shifts.class);
startActivity(intent);
break;
}
}
#Override
public boolean dispatchTouchEvent(MotionEvent me) {
this.detector.onTouchEvent(me);
return super.dispatchTouchEvent(me);
}
#Override
public void onDoubleTap() {
// TODO Auto-generated method stub
}
public class ShiftProgress extends AsyncTask<String, Integer, String> {
#Override
protected String doInBackground(String... params) {
int count = 0;
int seconds = 0;
int minutesTime = 0;
int minutesCount = 1;
for (;;) {
if (seconds % 60 == 0) {
minutesTime = count / 60;
seconds = 0;
}
if (seconds < 10) {
formattedSeconds = String.format("%02d", seconds);
}
else if (seconds >= 10) {
formattedSeconds = String.valueOf(seconds);
}
if (minutesTime < 10) {
formattedMinutes = String.format("%02d", minutesTime);
}
else if (minutesTime >= 10) {
formattedMinutes = String.valueOf(minutesTime);
}
if (minutesTime % 60 == 0) {
hoursCount = minutesCount / 60;
minutesTime = 0;
}
double sal = 40;
double SEC = 3600;
double salper = count * (sal / SEC);
madeSoFar = String.valueOf(formatter.format(salper));
try {
mHandler.obtainMessage(1).sendToTarget();
Thread.sleep(1000);
seconds++;
count++;
} catch (InterruptedException e) {
e.printStackTrace();
}
if (killcheck) {
break;
}
}
// int length = count /360;
return null;
}
protected void onProgressUpdate(Integer... progress) {
}
protected void onPostExecute(Long result) {
}
}
#Override
public void onSaveInstanceState() {
// TODO Auto-generated method stub
Toast.makeText(this, "Activity state saved", Toast.LENGTH_LONG);
}
#Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
// Restore UI state from the savedInstanceState.
// This bundle has also been passed to onCreate.
checkedIN = savedInstanceState.getString("checkIN");
clicked = savedInstanceState.getBoolean("button");
Toast.makeText(this, "Activity state Restored", Toast.LENGTH_LONG);
}
#Override
public void onPause(Bundle b) {
// TODO Auto-generated method stub
b.putString("checkIN", checkedIN);
b.putBoolean("button", clicked);
Toast.makeText(this, "Activity state saved", Toast.LENGTH_LONG);
super.onPause();
}
#Override
public void onSaveInstanceState(Bundle outState) {
outState.putString("checkIN", checkedIN);
outState.putBoolean("button", clicked);
Toast.makeText(this, "Activity state saved", Toast.LENGTH_LONG);
// etc.
super.onSaveInstanceState(outState);
}
#Override
protected void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Activity is getting killed", Toast.LENGTH_LONG)
.show();
}
}

You should not keep your Async task running in the background when your activity is send to the background. Your activity can be quit at any time so that you wouldn't have a reference to your activity anymore.
Regarding the preservation of state you could have a look at Activity.onRetainNonConfigurationInstance()