Android实现秒表计时器的程序设计

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Android实现秒表计时器的程序设计

2013年08月16日 ⁄ 综合 ⁄ 共 9462字 ⁄ 字号小中大 ⁄ 评论关闭

这是学习Android来第一个完整的Android程序。

主要功能是实现秒表计时，功能简介如下：

简介：计时器小程序——秒表计时器，程序界面简洁，只有一个时间显示区域和两个图片按钮，一个按钮是开始/暂停，另一个按钮是停止。

1.功能：

(1)根据用户设置.按0.1秒或1秒为最小单位计时，满60秒进为分钟，最大单位是分钟。

默认分钟为两位，超过两位后自动变为三位分钟。

(2).显示格式为

1.最小计时单位为0.1秒时，显示为：分钟：秒：0.1秒。例如：02:07:5

2.最小计时单位为1秒时，显示为：分钟：秒。例如：02:07

2.操作步骤

(1).按开始按钮，开始计时，此时开始按钮变为暂停按钮

(2).按暂停按钮，暂停计时，显示当前的计时时间

(3).按停止按钮，停止计时，暂停按钮恢复为开始按钮，时间显示为：00:00:00

(4)按menu键弹出menu菜单，第一项为设置计时单位，含有子菜单，可以设置计时单位为1秒或者为0.1秒。

画面显示如下所示：

以0.1秒为单位计时

2.计时单位设置子菜单

计时单位设置子菜单

主要代码如下：

1.MyTimer.java

package com.min; import java.io.ByteArrayOutputStream; import java.io.FileInputStream; import java.io.IOException; 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.SubMenu; import android.view.View; import android.widget.ImageButton; import android.widget.TextView; public class MyTimer 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); } }

2.main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" " /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:textSize="80sp" android:gravity="center" android:text="@string/init_time_100millisecond" android:id="@+id/tvTime" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" " /> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:gravity="center" android:layout_width="fill_parent" android:layout_height="wrap_content" > <ImageButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:id="@+id/btnStartPaunse" android:src="@drawable/start" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" " /> <ImageButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:id="@+id/btnStop" android:src="@drawable/stop" /> </LinearLayout> </LinearLayout>

3.strings.xml

<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">秒表计时器</string> <string name="init_time_second">00:00</string> <string name="init_time_100millisecond">00:00:0</string> <string name="menu_setting_timer_unit">设置计时单位</string> <string name="menu_about">关于</string> <string name="menu_exit">退出</string> <string name="menu_setting_second">1秒</string> <string name="menu_setting_100milisec">0.1秒</string> </resources>

本程序安装文件下载地址：http://download.csdn.net/source/2606201

【上篇】管理专业学生必懂的部分知识
【下篇】POJ 3662 Telephone Lines 二分答案+djk

作者: soldi

该日志由 soldi 于11年前发表在综合分类下，最后更新于 2013年08月16日.
转载请注明: Android实现秒表计时器的程序设计 | 学步园 +复制链接

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Android实现秒表计时器的程序设计

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