Example of stopwatch timer implemented by Android

package ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
public class MyTime extends Activity {
  private long mlCount = 0;
  private long mlTimerUnit = 100;
  private TextView tvTime;
  private ImageButton btnStartPause;
  private ImageButton btnStop;
  private Timer timer = null;
  private TimerTask task = null;
  private Handler handler = null;
  private Message msg = null;
  private boolean bIsRunningFlg = false;
  private static final String MYTIMER_TAG = "MYTIMER_LOG";
  // menu item
  private static final int SETTING_TIMER_UNIT_ID = ;
  private static final int ABOUT_ID =  + 1;
  private static final int EXIT_ID =  + 2;
  private static final int SETTING_SECOND_ID =  + 101;
  private static final int SETTING_100MILLISECOND_ID =  + 102;
  // Setting timer unit flag
  private int settingTimerUnitFlg = SETTING_100MILLISECOND_ID;
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    (savedInstanceState);
    setContentView();
    tvTime = (TextView) findViewById();
    btnStartPause = (ImageButton) findViewById();
    btnStop = (ImageButton) findViewById();
    SharedPreferences sharedPreferences = getSharedPreferences(
        "mytimer_unit", Context.MODE_PRIVATE);
    // The second parameter of getString() is the default value. If the key does not exist in the preference, the default value will be returned.    mlTimerUnit = ("time_unit", 100);
    (MYTIMER_TAG, "mlTimerUnit = " + mlTimerUnit);
    if (1000 == mlTimerUnit) {
      // second
      settingTimerUnitFlg = SETTING_SECOND_ID;
      (.init_time_second);
    } else if (100 == mlTimerUnit) {
      // 100 millisecond
      settingTimerUnitFlg = SETTING_100MILLISECOND_ID;
      (.init_time_100millisecond);
    }
    // Handle timer message
    handler = new Handler() {
      @Override
      public void handleMessage(Message msg) {
        // TODO Auto-generated method stub
        switch () {
        case 1:
          mlCount++;
          int totalSec = 0;
          int yushu = 0;
          if (SETTING_SECOND_ID == settingTimerUnitFlg) {
            // second
            totalSec = (int) (mlCount);
          } else if (SETTING_100MILLISECOND_ID == settingTimerUnitFlg) {
            // 100 millisecond
            totalSec = (int) (mlCount / 10);
            yushu = (int) (mlCount % 10);
          }
          // Set time display
          int min = (totalSec / 60);
          int sec = (totalSec % 60);
          try {
            if (SETTING_SECOND_ID == settingTimerUnitFlg) {
              // second(1000ms)
              (("%1$02d:%2$02d", min,
                  sec));
            } else if (SETTING_100MILLISECOND_ID == settingTimerUnitFlg) {
              // 100 millisecond
              (("%1$02d:%2$02d:%3$d",
                  min, sec, yushu));
            }
          } catch (Exception e) {
            ("" + min + ":" + sec + ":" + yushu);
            ();
            ("MyTimer onCreate", "Format string error.");
          }
          break;
        default:
          break;
        }
        (msg);
      }
    };
    (startPauseListener);
    (stopListener);
  }
  // Start and pause
   startPauseListener = new () {
    @Override
    public void onClick(View v) {
      // TODO Auto-generated method stub
      (MYTIMER_TAG, "Start/Pause is clicked.");
      if (null == timer) {
        if (null == task) {
          task = new TimerTask() {
            @Override
            public void run() {
              // TODO Auto-generated method stub
              if (null == msg) {
                msg = new Message();
              } else {
                msg = ();
              }
               = 1;
              (msg);
            }
          };
        }
        timer = new Timer(true);
        (task, mlTimerUnit, mlTimerUnit); // set timer
      // duration
      }
      // start
      if (!bIsRunningFlg) {
        bIsRunningFlg = true;
        // ();
      } else { // pause
        try {
          bIsRunningFlg = false;
          ();
          task = null;
          (); // Cancel timer
          ();
          timer = null;
          ();
          // ();
        } catch (Exception e) {
          ();
        }
      }
    }
  };
  // Stop
   stopListener = new () {
    @Override
    public void onClick(View v) {
      // TODO Auto-generated method stub
      (MYTIMER_TAG, "Stop is clicked.");
      if (null != timer) {
        ();
        task = null;
        (); // Cancel timer
        ();
        timer = null;
        ();
      }
      mlCount = 0;
      bIsRunningFlg = false;
      // ();
      if (SETTING_SECOND_ID == settingTimerUnitFlg) {
        // second
        (.init_time_second);
      } else if (SETTING_100MILLISECOND_ID == settingTimerUnitFlg) {
        // 100 millisecond
        (.init_time_100millisecond);
      }
    }
  };
  // Menu
  @Override
  public boolean onCreateOptionsMenu( menu) {
    // TODO Auto-generated method stub
    (menu);
    (MYTIMER_TAG, "Menu is created.");
    // Stop timer
    if (null != task) {
      ();
      task = null;
    }
    if (null != timer) {
      (); // Cancel timer
      ();
      timer = null;
      ();
    }
    bIsRunningFlg = false;
    mlCount = 0;
    // ();
    // Set the name of the submenu    // SubMenu settingMenu = (0, SETTING_TIMER_UNIT_ID, 0,
    // .menu_setting_timer_unit).setIcon();
    // Add submenu according to the corresponding name    // Sub menus do not support item icons, or nested sub menus.
    // (1, SETTING_SECOND_ID, 0,
    // .menu_setting_second);
    // (1, SETTING_100MILLISECOND_ID, 1,
    // .menu_setting_100milisec);
    // About
    // (0, ABOUT_ID, 1,
    // .menu_about).setIcon();
    // quit    // (0, EXIT_ID, 2, .menu_exit).setIcon();
    return true;
  }
  // Menu item
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // TODO Auto-generated method stub
    (MYTIMER_TAG, "Menu item is selected.");
    switch (()) {
    case SETTING_TIMER_UNIT_ID:
      break;
    case ABOUT_ID:
      // Display about dialog
       builder = new (this);
      (.app_name)
      .setMessage("This program was developed by Yumeng/nContact author: minyugong@")
      .setCancelable(true)
      .setPositiveButton("Sure", new () {
        public void onClick(DialogInterface dialog, int id) {
          ();
        }
      });
      AlertDialog alert = ();
      ();
      break;
    case EXIT_ID:
      finish(); // Exit application
      break;
    case SETTING_SECOND_ID: // Seconds (1000ms)      if (SETTING_SECOND_ID != settingTimerUnitFlg) {
        mlTimerUnit = 1000;
        settingTimerUnitFlg = SETTING_SECOND_ID;
      }
      (.init_time_second);
      break;
    case SETTING_100MILLISECOND_ID: // 100ms      if (SETTING_100MILLISECOND_ID != settingTimerUnitFlg) {
        mlTimerUnit = 100;
        settingTimerUnitFlg = SETTING_100MILLISECOND_ID;
      }
      (.init_time_100millisecond);
      break;
    default:
      (MYTIMER_TAG, "Other menu item...");
      break;
    }
    // Save timer unit
    try {
      SharedPreferences sharedPreferences = getSharedPreferences(
          "mytimer_unit", Context.MODE_PRIVATE);
       editor = ();// Get the editor      ("time_unit", mlTimerUnit);
      ();// Submit modification    } catch (Exception e) {
      ();
      (MYTIMER_TAG, "save timer unit error.");
    }
    return (item);
  }
  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub
    if (KeyEvent.KEYCODE_MENU == keyCode) {
      (); // Call this and the menu will pop up      (MYTIMER_TAG, "Menu key is clicked.");
      // Stop timer
      if (null != task) {
        ();
        task = null;
      }
      if (null != timer) {
        (); // Cancel timer
        ();
        timer = null;
        ();
      }
      bIsRunningFlg = false;
      mlCount = 0;
      // ();
      return true;
    }
    return (keyCode, event);
  }
}