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。