Android实现的秒表计时器示例

本文实例讲述了Android实现的秒表计时器。分享给大家供大家参考，具体如下：

package com.liu.time;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
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 = Menu.FIRST;
 private static final int ABOUT_ID = Menu.FIRST + 1;
 private static final int EXIT_ID = Menu.FIRST + 2;
 private static final int SETTING_SECOND_ID = Menu.FIRST + 101;
 private static final int SETTING_100MILLISECOND_ID = Menu.FIRST + 102;
 // Setting timer unit flag
 private int settingTimerUnitFlg = SETTING_100MILLISECOND_ID;
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
   tvTime = (TextView) findViewById(R.id.tvTime);
   btnStartPause = (ImageButton) findViewById(R.id.btnStartPaunse);
   btnStop = (ImageButton) findViewById(R.id.btnStop);
   SharedPreferences sharedPreferences = getSharedPreferences(
       "mytimer_unit", Context.MODE_PRIVATE);
   // getString()第二个参数为缺省值，如果preference中不存在该key，将返回缺省值
   mlTimerUnit = sharedPreferences.getLong("time_unit", 100);
   Log.i(MYTIMER_TAG, "mlTimerUnit = " + mlTimerUnit);
   if (1000 == mlTimerUnit) {
     // second
     settingTimerUnitFlg = SETTING_SECOND_ID;
     tvTime.setText(R.string.init_time_second);
   } else if (100 == mlTimerUnit) {
     // 100 millisecond
     settingTimerUnitFlg = SETTING_100MILLISECOND_ID;
     tvTime.setText(R.string.init_time_100millisecond);
   }
   // Handle timer message
   handler = new Handler() {
     @Override
     public void handleMessage(Message msg) {
       // TODO Auto-generated method stub
       switch (msg.what) {
       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)
             tvTime.setText(String.format("％1$02d:％2$02d", min,
                 sec));
           } else if (SETTING_100MILLISECOND_ID == settingTimerUnitFlg) {
             // 100 millisecond
             tvTime.setText(String.format("％1$02d:％2$02d:％3$d",
                 min, sec, yushu));
           }
         } catch (Exception e) {
           tvTime.setText("" + min + ":" + sec + ":" + yushu);
           e.printStackTrace();
           Log.e("MyTimer onCreate", "Format string error.");
         }
         break;
       default:
         break;
       }
       super.handleMessage(msg);
     }
   };
   btnStartPause.setOnClickListener(startPauseListener);
   btnStop.setOnClickListener(stopListener);
 }
 // Start and pause
 View.OnClickListener startPauseListener = new View.OnClickListener() {
   @Override
   public void onClick(View v) {
     // TODO Auto-generated method stub
     Log.i(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 = Message.obtain();
             }
             msg.what = 1;
             handler.sendMessage(msg);
           }
         };
       }
       timer = new Timer(true);
       timer.schedule(task, mlTimerUnit, mlTimerUnit); // set timer
     // duration
     }
     // start
     if (!bIsRunningFlg) {
       bIsRunningFlg = true;
       // btnStartPause.setImageResource(R.drawable.pause);
     } else { // pause
       try {
         bIsRunningFlg = false;
         task.cancel();
         task = null;
         timer.cancel(); // Cancel timer
         timer.purge();
         timer = null;
         handler.removeMessages(msg.what);
         // btnStartPause.setImageResource(R.drawable.start);
       } catch (Exception e) {
         e.printStackTrace();
       }
     }
   }
 };
 // Stop
 View.OnClickListener stopListener = new View.OnClickListener() {
   @Override
   public void onClick(View v) {
     // TODO Auto-generated method stub
     Log.i(MYTIMER_TAG, "Stop is clicked.");
     if (null != timer) {
       task.cancel();
       task = null;
       timer.cancel(); // Cancel timer
       timer.purge();
       timer = null;
       handler.removeMessages(msg.what);
     }
     mlCount = 0;
     bIsRunningFlg = false;
     // btnStartPause.setImageResource(R.drawable.start);
     if (SETTING_SECOND_ID == settingTimerUnitFlg) {
       // second
       tvTime.setText(R.string.init_time_second);
     } else if (SETTING_100MILLISECOND_ID == settingTimerUnitFlg) {
       // 100 millisecond
       tvTime.setText(R.string.init_time_100millisecond);
     }
   }
 };
 // Menu
 @Override
 public boolean onCreateOptionsMenu(android.view.Menu menu) {
   // TODO Auto-generated method stub
   super.onCreateOptionsMenu(menu);
   Log.i(MYTIMER_TAG, "Menu is created.");
   // Stop timer
   if (null != task) {
     task.cancel();
     task = null;
   }
   if (null != timer) {
     timer.cancel(); // Cancel timer
     timer.purge();
     timer = null;
     handler.removeMessages(msg.what);
   }
   bIsRunningFlg = false;
   mlCount = 0;
   // btnStartPause.setImageResource(R.drawable.start);
   // 设置子菜单的名称
   // SubMenu settingMenu = menu.addSubMenu(0, SETTING_TIMER_UNIT_ID, 0,
   // R.string.menu_setting_timer_unit).setIcon(R.drawable.setting);
   // 按对应的名称增加子菜单
   // Sub menus do not support item icons, or nested sub menus.
   // settingMenu.add(1, SETTING_SECOND_ID, 0,
   // R.string.menu_setting_second);
   // settingMenu.add(1, SETTING_100MILLISECOND_ID, 1,
   // R.string.menu_setting_100milisec);
   // About
   // menu.add(0, ABOUT_ID, 1,
   // R.string.menu_about).setIcon(R.drawable.about);
   // 退出
   // menu.add(0, EXIT_ID, 2, R.string.menu_exit).setIcon(R.drawable.exit);
   return true;
 }
 // Menu item
 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
   // TODO Auto-generated method stub
   Log.i(MYTIMER_TAG, "Menu item is selected.");
   switch (item.getItemId()) {
   case SETTING_TIMER_UNIT_ID:
     break;
   case ABOUT_ID:
     // Display about dialog
     AlertDialog.Builder builder = new AlertDialog.Builder(this);
     builder.setTitle(R.string.app_name)
     .setMessage("本程序由雨梦开发/n联系作者:minyugong@163.com")
     .setCancelable(true)
     .setPositiveButton("确定", new DialogInterface.OnClickListener() {
       public void onClick(DialogInterface dialog, int id) {
         dialog.cancel();
       }
     });
     AlertDialog alert = builder.create();
     alert.show();
     break;
   case EXIT_ID:
     finish(); // Exit application
     break;
   case SETTING_SECOND_ID: // 秒(1000ms)
     if (SETTING_SECOND_ID != settingTimerUnitFlg) {
       mlTimerUnit = 1000;
       settingTimerUnitFlg = SETTING_SECOND_ID;
     }
     tvTime.setText(R.string.init_time_second);
     break;
   case SETTING_100MILLISECOND_ID: // 100毫秒
     if (SETTING_100MILLISECOND_ID != settingTimerUnitFlg) {
       mlTimerUnit = 100;
       settingTimerUnitFlg = SETTING_100MILLISECOND_ID;
     }
     tvTime.setText(R.string.init_time_100millisecond);
     break;
   default:
     Log.i(MYTIMER_TAG, "Other menu item...");
     break;
   }
   // Save timer unit
   try {
     SharedPreferences sharedPreferences = getSharedPreferences(
         "mytimer_unit", Context.MODE_PRIVATE);
     SharedPreferences.Editor editor = sharedPreferences.edit();// 获取编辑器
     editor.putLong("time_unit", mlTimerUnit);
     editor.commit();// 提交修改
   } catch (Exception e) {
     e.printStackTrace();
     Log.e(MYTIMER_TAG, "save timer unit error.");
   }
   return super.onOptionsItemSelected(item);
 }
 @Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
   // TODO Auto-generated method stub
   if (KeyEvent.KEYCODE_MENU == keyCode) {
     super.openOptionsMenu(); // 调用这个，就可以弹出菜单
     Log.i(MYTIMER_TAG, "Menu key is clicked.");
     // Stop timer
     if (null != task) {
       task.cancel();
       task = null;
     }
     if (null != timer) {
       timer.cancel(); // Cancel timer
       timer.purge();
       timer = null;
       handler.removeMessages(msg.what);
     }
     bIsRunningFlg = false;
     mlCount = 0;
     // btnStartPause.setImageResource(R.drawable.start);
     return true;
   }
   return super.onKeyDown(keyCode, event);
 }
}

希望本文所述对大家Android程序设计有所帮助。