Question

I am new to android. I have an application which needs to show a data stored in database (which is a time value, example 40 hours) in a textview.

I want to count down the value from 40 (in my case) to zero and an alarm should start when it hits zero.

Answer 1

just convert remaining time in second(get hour value from db and convert it into second, in my case i am getting time in seconds )

public class CountDownActivity extends Activity {

    int time,initStart,startPointTime,hh,mm,ss,millis;
    TextView txtSecond;
    TextView txtMinute;
    TextView txtHour;
    TextView txtDay;
    Handler handler;
    long seconds =40*60*60;
    Runnable updater;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);


    txtSecond=(TextView)findViewById(R.id.cntSecond);
            txtMinute=(TextView)findViewById(R.id.cntMinute);
            txtHour=(TextView)findViewById(R.id.cntHour);
            txtDay=(TextView)findViewById(R.id.cntDay);

                    handler= new Handler();
            initStart = (int) SystemClock.elapsedRealtime();

             updater = new Runnable() {

                public void run() {
                    int sec,minute,hour,day;
                    long  diff = seconds;
                    System.out.println(diff);
                    if (diff >= 1) {
                        sec =  (int) (diff%60);
                    } else {
                        sec=00;
                    }
                    txtSecond.setText("" +sec);
                    diff = diff/60;
                    System.out.println(diff);
                    if (diff >= 1) {
                        minute =  (int) (diff%60);
                    } else {
                        minute=00;
                    }
                    txtMinute.setText("" +minute);
                    diff = diff/60;
                    if (diff >= 1) {
                        hour =  (int) (diff%24);
                    } else {hour = 00; }
                    txtHour.setText("" +hour);
                    diff = diff/24;
                    if (diff >= 1) {
                        day =  (int) diff;
                    } else { day =00; }
                    txtDay.setText("" +day);
                    seconds=seconds-1;


                    handler.postDelayed(this, 1000);
                }
            };

            handler.post(updater);
}

> //and don't forget to removeCallback on destroy

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        handler.removeCallbacks(updater);
    }
}