Merhabalar

Android’te belirli bir tarih için geri sayım uygulamasında kullanacağınız kod bloğu aşağıdadır. Bir tane text view ile kolayca geri sayım uygulaması yapabilirsiniz.

    public void countDownStart() {
        handler = new Handler();
        runnable = new Runnable() {
            @Override
            public void run() {
                handler.postDelayed(this, 1000);
                try {
                    SimpleDateFormat dateFormat = new SimpleDateFormat(
                            "yyyy-MM-dd hh:mm");

                    futureDate = dateFormat.parse("2018-03-11 10:00");
                    currentDate = new Date();
                    if (!currentDate.after(futureDate)) {
                        diff = futureDate.getTime()
                                - currentDate.getTime();
                        days = diff / (24 * 60 * 60 * 1000);
                        diff -= days * (24 * 60 * 60 * 1000);
                        hours = diff / (60 * 60 * 1000);
                        diff -= hours * (60 * 60 * 1000);
                        minutes = diff / (60 * 1000);
                        diff -= minutes * (60 * 1000);
                        seconds = diff / 1000;
                        txtTimerDay.setText("" + String.format("%02d", days));
                        txtTimerHour.setText("" + String.format("%02d", hours));
                        txtTimerMinute.setText(""
                                + String.format("%02d", minutes));
                        txtTimerSecond.setText(""
                                + String.format("%02d", seconds));

                      /*  NotificationCompat.Builder builder =
                                new NotificationCompat.Builder(c)
                                        .setSmallIcon(R.drawable.ic_launcher)
                                        .setContentTitle("Notifications Example")
                                        .setContentText(Long.toString(days) + " - "+ Long.toString(hours) +" - "+ Long.toString(minutes) + " - " +
                                         Long.toString(seconds));
                        Intent notificationIntent = new Intent(c, MainActivity.class);
                        PendingIntent contentIntent = PendingIntent.getActivity(c, 0, notificationIntent,
                                PendingIntent.FLAG_UPDATE_CURRENT);
                        builder.setContentIntent(contentIntent);
                        // Add as notification
                        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                        manager.notify(0, builder.build());
*/
                    } else {
                        tvEvent.setVisibility(View.VISIBLE);
                        tvEvent.setText("The event started!");
                        textViewGone();
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };
        handler.postDelayed(runnable, 1 * 1000);
    }