在android中12小时后执行操作

Handler handler = new Handler();
Runnable runnable = new Runnable() {
    @Override
    public void run() {
        // 在此处执行需要延迟执行的操作
    }
};
handler.postDelayed(runnable, 12 * 60 * 60 * 1000);

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, YourReceiver.class); // YourReceiver为自定义的广播接收器
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
long delayMillis = 12 * 60 * 60 * 1000; // 12小时的延迟时间
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + delayMillis, pendingIntent);