如何确定基于Android ICS 4.0.2的设备中的随机时间变化

Question

我有一个基于Android ICS的设备。没有任何应用程序运行它将不会改变时间。但每当我运行一个应用程序时，它会随机更改时间（大多数提前2天）。

没有设定时间功能用于设置设备时间。这个程序是我写的。它在每个活动上有许多线程和1毫秒计时器。

设备在运行12小时后更改了时间。

为什么设备时间在变化？此计时器或线程是否会导致问题，从而改变设备时间。

 public class MainActivity extends Activity {



 TextView DateTextView;
 TextView BatteryTextView;
 String   date;

 Thread mUpdateUIThread;

 int[] m_array ; 
 Timer mTimerThread;

 String StrDdate; 
 int n  = 0;


 public native void WatchDogTimeTest();

 public IntentFilter s_intentFilter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  DateTextView    = (TextView)findViewById(R.id.DatedisplayTxtVw);
  BatteryTextView = (TextView)findViewById(R.id.BatteryStatus);

  date = new SimpleDateFormat("dd-MM-yyyy").format(new Date());
  DateTextView.setText(date);

   s_intentFilter = new IntentFilter();
   s_intentFilter.addAction(Intent.ACTION_DATE_CHANGED);
   s_intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
   s_intentFilter.addAction(Intent.ACTION_POWER_CONNECTED);
   s_intentFilter.addAction(Intent.ACTION_POWER_DISCONNECTED);

   this.registerReceiver(this.mBatInfoReceiver,s_intentFilter);


   CreateMutipleThread();
   TimerThread();

  }


 public void CreateMutipleThread()
 {
   for(int i = 0 ; i < 100 ; i++)
   {
   mUpdateUIThread= new Thread() {
      @Override
      public void run() {
        try {
          while (!isInterrupted()) 
          {
            Thread.sleep(1000);   //Check for Aux Battery Status After 10 Second
            runOnUiThread(new Runnable()
            {
              @Override
              public void run() 
              {
                  n++;

                  if(n >= 10000)
                      n= 0;
              }
            });
          }
        } catch (InterruptedException e) {
       }
      }
    };
    mUpdateUIThread.start();
 }
}

 public void TimerThread()
   { 

mTimerThread = new Timer();
//Set the schedule function and rate
mTimerThread.schedule(new TimerTask() {
    @Override
    public void run() {
        StrDdate = new SimpleDateFormat("dd-MM-yyyy").format(new Date());
        //Log.d("TimeDevice","Time"+StrDdate);
    }      
  },1000,1);  
 }

public void InvalidateTimer()
   {
  this.runOnUiThread(new Runnable() {
    @Override
    public void run() {
        printTime();
    }
  });

 } 

 public void printTime()
 {

 }


  public BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver(){

  @Override
  public void onReceive(Context arg0, Intent intent) {

    final String action  = intent.getAction();

    //Date Change Broad cast
    if(action.equals(Intent.ACTION_DATE_CHANGED))
    {
        String mydate    java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime());
         date = new SimpleDateFormat("dd-MM-yyyy").format(new Date());
         DateTextView.setText(date);
         DateTextView.setBackgroundColor(Color.RED);
         BatteryTextView.setText(mydate);
    }

  }
 };
 }