Time difference between two times

Question

I want to display the difference between two times in hh:mm format.

The first time is from a database and the second time is the system time. Time difference is updated every second.

How can I do that?

Currently I'm using two manual time if this works perfectly then I implement it into my apps.

public class MainActivity extends Activity  {     TextView mytext;     @Override     protected void onCreate(Bundle savedInstanceState)      {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          Timer updateTimer = new Timer();         updateTimer.schedule(new TimerTask()          {             public void run()              {                 try                  {                     TextView txtCurrentTime= (TextView)findViewById(R.id.mytext);                     SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss aa");                     Date date1 = format.parse("08:00:12 pm");                     Date date2 = format.parse("05:30:12 pm");                     long mills = date1.getTime() - date2.getTime();                     Log.v("Data1", ""+date1.getTime());                     Log.v("Data2", ""+date2.getTime());                     int hours = (int) (mills/(1000 * 60 * 60));                     int mins = (int) (mills % (1000*60*60));                      String diff = hours + ":" + mins; // updated value every1 second                     txtCurrentTime.setText(diff);                 }                  catch (Exception e)                  {                     e.printStackTrace();                 }             }          }, 0, 1000);     } } 

Answer 1

To Calculate the difference between two dates you could try something like:

long millis = date1.getTime() - date2.getTime(); int hours = (int) (millis / (1000 * 60 * 60)); int mins = (int) ((millis / (1000 * 60)) % 60);  String diff = hours + ":" + mins;  

To update the Time Difference every second you can make use of Timer.

Timer updateTimer = new Timer(); updateTimer.schedule(new TimerTask() {     public void run() {         try {             long mills = date1.getTime() - date2.getTime();                 int hours = millis/(1000 * 60 * 60);                  int mins = (mills/(1000*60)) % 60;                   String diff = hours + ":" + mins; // updated value every1 second             } catch (Exception e) {             e.printStackTrace();         }     }  }, 0, 1000); // here 1000 means 1000 mills i.e. 1 second 

Edit : Working Code :

public class MainActivity extends Activity {      private TextView txtCurrentTime;          @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         txtCurrentTime= (TextView)findViewById(R.id.mytext);         Timer updateTimer = new Timer();         updateTimer.schedule(new TimerTask()          {             public void run()              {                 try                  {                                          SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss aa");                     Date date1 = format.parse("08:00:12 pm");                     Date date2 = format.parse("05:30:12 pm");                     long mills = date1.getTime() - date2.getTime();                     Log.v("Data1", ""+date1.getTime());                     Log.v("Data2", ""+date2.getTime());                     int hours = (int) (mills/(1000 * 60 * 60));                     int mins = (int) (mills/(1000*60)) % 60;                      String diff = hours + ":" + mins; // updated value every1 second                     txtCurrentTime.setText(diff);                 }                  catch (Exception e)                  {                     e.printStackTrace();                 }             }          }, 0, 1000);     } 

Answer 2

finally did it yuppiiieee ...

package com.timedynamicllyupdate;  import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.TextView;  public class MainActivity extends Activity  {     TextView current;     private TextView txtCurrentTime;     @Override     protected void onCreate(Bundle savedInstanceState)      {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          Thread myThread = null;         Runnable myRunnableThread = new CountDownRunner();         myThread= new Thread(myRunnableThread);            myThread.start();          current= (TextView)findViewById(R.id.current);     }       public void doWork()      {         runOnUiThread(new Runnable()          {             public void run()              {                 try                 {                     SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss aa");                      txtCurrentTime= (TextView)findViewById(R.id.mytext);                      Date systemDate = Calendar.getInstance().getTime();                     String myDate = sdf.format(systemDate); //                  txtCurrentTime.setText(myDate);                      Date Date1 = sdf.parse(myDate);                     Date Date2 = sdf.parse("02:50:00 pm");                      long millse = Date1.getTime() - Date2.getTime();                     long mills = Math.abs(millse);                      int Hours = (int) (mills/(1000 * 60 * 60));                     int Mins = (int) (mills/(1000*60)) % 60;                     long Secs = (int) (mills / 1000) % 60;                      String diff = Hours + ":" + Mins + ":" + Secs; // updated value every1 second                     current.setText(diff);                 }                 catch (Exception e)                  {                  }             }         });     }      class CountDownRunner implements Runnable     {         // @Override         public void run()          {             while(!Thread.currentThread().isInterrupted())             {                 try                  {                     doWork();                     Thread.sleep(1000); // Pause of 1 Second                 }                  catch (InterruptedException e)                  {                         Thread.currentThread().interrupt();                 }                 catch(Exception e)                 {                 }             }         }     }      @Override     public boolean onCreateOptionsMenu(Menu menu)      {         // Inflate the menu; this adds items to the action bar if it is present.         getMenuInflater().inflate(R.menu.activity_main, menu);         return true;     }  }