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Android多功能时钟开发案例（实战篇）

上一篇为大家介绍的是Android多功能时钟开发基础内容，大家可以回顾一下，Android多功能时钟开发案例（基础篇）

接下来进入实战，快点来学习吧。

一、时钟

在布局文件中我们看到，界面上只有一个TextView，这个TextView的作用就是显示一个系统的当前时间，同时这个时间还是一秒一秒跳的，要实现一秒一秒的跳就需要我们每隔一秒就要刷新一下，同时我们这里还考虑了切换到另一个Tab的时候，这个时间就不跳动了，这样就会减少这个对系统的占用，考虑到了这点我们在这里用到了Handler，通过handler发送的msg.what 来判断是否要刷新时间。

public class TimeView extends LinearLayout { 
 
 private TextView tvTime; 
 public TimeView(Context context) { 
 super(context); 
 } 
 
 public TimeView(Context context, AttributeSet attrs) { 
 super(context, attrs); 
 } 
 
 public TimeView(Context context, AttributeSet attrs, int defStyle) { 
 super(context, attrs, defStyle); 
 } 
 
 @Override 
 protected void onFinishInflate() { 
 super.onFinishInflate(); 
 tvTime = (TextView) findViewById(R.id.tvTime); 
 //tvTime.setText("hello"); 
  
 timeHandler.sendEmptyMessage(0); 
 } 
 
 @Override 
 protected void onVisibilityChanged(View changedView, int visibility) { 
 super.onVisibilityChanged(changedView, visibility); 
 //当再次切换到这个Tab时我们就再发送一次这个消息，否者就把所有的消息移除掉 
 if (visibility == View.VISIBLE) { 
  timeHandler.sendEmptyMessage(0);  
 }else{ 
  timeHandler.removeMessages(0); 
 } 
 } 
 
 private void refreshTime(){ 
 //获取当前的时间 
 Calendar c = Calendar.getInstance(); 
  
 tvTime.setText(String.format("%d:%d:%d", c.get(Calendar.HOUR_OF_DAY),c.get(Calendar.MINUTE),c.get(Calendar.SECOND))); 
 } 
 private Handler timeHandler = new Handler(){ 
 public void handleMessage(android.os.Message msg) { 
  refreshTime(); 
  
  //处于当前Tab的时候给自己发送信息，可以刷新 
  if (getVisibility() == View.VISIBLE) {  
  //1秒钟后再次执行以下sendEmptyMessage，what参数用于区分不同的message 
  timeHandler.sendEmptyMessageDelayed(0, 1000); 
  } 
 }; 
 }; 
}

其实这里的Handler可以用Timer来完成亦可以达到同样的效果。

在这里要提一下的是onFinishInflate()，这在我们自定义布局的时候一定要用到的，解释以及例子在之后上传的知识点中同样有，看看那个就可以了。

二、闹钟

从第二个布局中我们可以看到，我们在这里用到了一个ListView，这是用来存储我们添加的闹钟的，既然这里用到了ListView，那么我们接着就会想到要给这个ListView一个适配器adapter，因此我们会在这里创建这么一个适配器，
private ArrayAdapter<AlarmData> adapter; 

看到这里可能又会有疑问了，AlarmData这是个什么东西？有这么一个数据类型吗？？其实这里我们自定义了一个数据类型，用来专门存储一下创建的闹钟时间。我们来看一下自定义的数据类型代码吧！

// 自定义数据类型 
 private static class AlarmData { 
 private long time = 0; 
 private Calendar date; 
 private String timeLabel = ""; 
 
 public AlarmData(long time) { 
  this.time = time; 
  date = Calendar.getInstance(); 
  date.setTimeInMillis(time); 
  timeLabel = String.format("%d月%d日 %d:%d", 
   date.get(Calendar.MONTH) + 1, 
   date.get(Calendar.DAY_OF_MONTH), 
   date.get(Calendar.HOUR_OF_DAY), date.get(Calendar.MINUTE)); 
 } 
 
 public long getTime() { 
  return time; 
 } 
 
 public String getTimeLabel() { 
  return timeLabel; 
 } 
 
 public int getId() { 
  return (int) (getTime() / 1000 / 60); 
 } 
 
 @Override 
 public String toString() { 
  return getTimeLabel(); 
 } 
 
 }

这个数据类型的代码其实还是很容易明白的，不多讲了。

当我们到这里的时候，我们其实还没有真正的完成，假如我们的代码已经写好了，并且可以运行了我们运行一次后，并且添加了N个闹钟，当我们退出程序，再次打开就会发现，我们之前创建的闹钟都没了，原因是我们虽然把数据临时的保存在了ListView中，但是我们并没有长时间的保存，因此我们接着就来讲讲长久的保存这些闹钟数据。

private void saveAlarmList() { 
 Editor editor = getContext().getSharedPreferences( 
  AlarmView.class.getName(), Context.MODE_PRIVATE).edit(); 
 
 StringBuffer sb = new StringBuffer(); 
 
 for (int i = 0; i < adapter.getCount(); i++) { 
  sb.append(adapter.getItem(i).getTime()).append(","); 
 } 
 if (sb.length() > 1) { 
  String content = sb.toString().substring(0, sb.length() - 1); 
  editor.putString(KEY_ALARM_LIST, content); 
 
  System.out.println(content); 
 } else { 
  editor.putString(KEY_ALARM_LIST, null); 
 } 
 editor.commit(); 
 }

有了保存，我们当然的会想到读取

private void readSaveAlarmList() { 
 SharedPreferences sp = getContext().getSharedPreferences( 
  AlarmView.class.getName(), Context.MODE_PRIVATE); 
 String content = sp.getString(KEY_ALARM_LIST, null); 
 
 if (content != null) { 
  String[] timeStrings = content.split(","); 
  for (String string : timeStrings) { 
  adapter.add(new AlarmData(Long.parseLong(string))); 
  } 
 } 
 }

上面的一些陌生的类型在之后的知识点中可以查看。

接着我们来看看最关键的就是添加闹钟

private void addAlarm() { 
 
 Calendar c = Calendar.getInstance(); 
 
 new TPDiolog(getContext(), new TimePickerDialog.OnTimeSetListener() { 
 
  @Override 
  public void onTimeSet(TimePicker view, int hourOfDay, int minute) { 
 
  Calendar calendar = Calendar.getInstance(); 
  calendar.set(Calendar.HOUR_OF_DAY, hourOfDay); 
  calendar.set(Calendar.MINUTE, minute); 
  calendar.set(Calendar.SECOND, 0); 
  calendar.set(Calendar.MILLISECOND, 0); 
 
  Calendar currentTime = Calendar.getInstance(); 
  if (currentTime.getTimeInMillis() >= calendar.getTimeInMillis()) { 
   calendar.setTimeInMillis(calendar.getTimeInMillis() + 24 
    * 60 * 60 * 1000); 
  } 
  AlarmData ad = new AlarmData(calendar.getTimeInMillis()); 
  adapter.add(ad); 
  alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 
   ad.getTime(), 5 * 60 * 1000, PendingIntent 
    .getBroadcast(getContext(), ad.getId(), 
     new Intent(getContext(), 
      AlarmReceiver.class), 0)); 
  saveAlarmList(); 
  } 
 }, c.get(Calendar.HOUR_OF_DAY), c.get(Calendar.MINUTE), true).show(); 
 }

这里我们可以看到TPDiolog这个，当你自己尝试过后可能也会遇到同样的问题，那就是当你通过TimePickerDialog这个系统的时间选择控件的时候，点击确定后，会创建两条记录，这是因为我们点击确定后会调用该事件监听器的时间，在关闭这个Dialog的时候也会调用一次，所以我们在这里自己重写了一下该类的方法

TPDiolog.class

public class TPDiolog extends TimePickerDialog { 
 
 public TPDiolog(Context context, OnTimeSetListener callBack, int hourOfDay, 
  int minute, boolean is24HourView) { 
 super(context, callBack, hourOfDay, minute, is24HourView); 
 } 
 
 //重写该方法是为了避免调用两次onTimeSet 
 @Override 
 protected void onStop() { 
 //super.onStop(); 
 } 
}

在之前的代码中我们还看到了一个alarmManager这一对象，这是我们为了调用系统的闹钟服务创建的实例，我们也因此而创建了一个AlarmReceiver.class

public class AlarmReceiver extends BroadcastReceiver { 
 
 @Override 
 public void onReceive(Context context, Intent arg1) { 
 System.out.println("闹钟执行了！"); 
  
 AlarmManager am=(AlarmManager) context.getSystemService(Context.ALARM_SERVICE); 
 am.cancel(PendingIntent.getBroadcast(context, getResultCode(), new Intent(context, AlarmReceiver.class), 0)); 
  
 Intent i =new Intent(context,PlayAlarmAty.class); 
 //设置intent的启动模式 
 i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
 context.startActivity(i); 
 } 
 
}

一些小的地方讲好了，最后把AlarmView.class的完整代码贴上。

package com.example.clock; 
 
import java.util.Calendar; 
import java.util.Date; 
import java.util.Iterator; 
 
import android.app.AlarmManager; 
import android.app.AlertDialog; 
import android.app.PendingIntent; 
import android.app.TimePickerDialog; 
import android.app.TimePickerDialog.OnTimeSetListener; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.content.SharedPreferences.Editor; 
import android.util.AttributeSet; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemLongClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.ListView; 
import android.widget.Switch; 
import android.widget.TimePicker; 
 
public class AlarmView extends LinearLayout { 
 
 private Button btnAddAlarm; 
 private ListView lvListAlarm; 
 private ArrayAdapter<AlarmData> adapter; 
 private AlarmManager alarmManager; 
 
 public AlarmView(Context context, AttributeSet attrs, int defStyle) { 
 super(context, attrs, defStyle); 
 init(); 
 } 
 
 public AlarmView(Context context, AttributeSet attrs) { 
 super(context, attrs); 
 init(); 
 } 
 
 public AlarmView(Context context) { 
 super(context); 
 init(); 
 } 
 
 private void init() { 
 alarmManager = (AlarmManager) getContext().getSystemService( 
  Context.ALARM_SERVICE); 
 } 
 
 @Override 
 protected void onFinishInflate() { 
 super.onFinishInflate(); 
 btnAddAlarm = (Button) findViewById(R.id.btnAddAlarm); 
 lvListAlarm = (ListView) findViewById(R.id.lvListAlarm); 
 
 adapter = new ArrayAdapter<AlarmData>(getContext(), 
  android.R.layout.simple_list_item_1); 
 lvListAlarm.setAdapter(adapter); 
 
 readSaveAlarmList(); 
 // adapter.add(new AlarmData(System.currentTimeMillis())); 
 
 btnAddAlarm.setOnClickListener(new OnClickListener() { 
 
  @Override 
  public void onClick(View v) { 
  addAlarm(); 
  } 
 }); 
 // 长按某项删除 
 lvListAlarm.setOnItemLongClickListener(new OnItemLongClickListener() { 
 
  @Override 
  public boolean onItemLongClick(AdapterView<?> arg0, View arg1, 
   final int position, long arg3) { 
 
  new AlertDialog.Builder(getContext()) 
   .setTitle("操作选项") 
   .setItems(new CharSequence[] { "删除", "删除1" }, 
    new DialogInterface.OnClickListener() { 
 
     @Override 
     public void onClick(DialogInterface dialog, 
      int which) { 
     switch (which) { 
     case 0: 
      deleteAlarm(position); 
      break; 
 
     default: 
      break; 
     } 
     } 
    }).setNegativeButton("取消", null).show(); 
  return true; 
  } 
 }); 
 } 
 
 private void deleteAlarm(int position) { 
 AlarmData ad = adapter.getItem(position); 
 adapter.remove(ad); 
 saveAlarmList(); 
 
 alarmManager.cancel(PendingIntent.getBroadcast(getContext(), 
  ad.getId(), new Intent(getContext(), AlarmReceiver.class), 0)); 
 } 
 
 private void addAlarm() { 
 
 Calendar c = Calendar.getInstance(); 
 
 new TPDiolog(getContext(), new TimePickerDialog.OnTimeSetListener() { 
 
  @Override 
  public void onTimeSet(TimePicker view, int hourOfDay, int minute) { 
 
  Calendar calendar = Calendar.getInstance(); 
  calendar.set(Calendar.HOUR_OF_DAY, hourOfDay); 
  calendar.set(Calendar.MINUTE, minute); 
  calendar.set(Calendar.SECOND, 0); 
  calendar.set(Calendar.MILLISECOND, 0); 
 
  Calendar currentTime = Calendar.getInstance(); 
  if (currentTime.getTimeInMillis() >= calendar.getTimeInMillis()) { 
   calendar.setTimeInMillis(calendar.getTimeInMillis() + 24 
    * 60 * 60 * 1000); 
  } 
  AlarmData ad = new AlarmData(calendar.getTimeInMillis()); 
  adapter.add(ad); 
  alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 
   ad.getTime(), 5 * 60 * 1000, PendingIntent 
    .getBroadcast(getContext(), ad.getId(), 
     new Intent(getContext(), 
      AlarmReceiver.class), 0)); 
  saveAlarmList(); 
  } 
 }, c.get(Calendar.HOUR_OF_DAY), c.get(Calendar.MINUTE), true).show(); 
 } 
 
 private static final String KEY_ALARM_LIST = "alarmlist"; 
 
 private void saveAlarmList() { 
 Editor editor = getContext().getSharedPreferences( 
  AlarmView.class.getName(), Context.MODE_PRIVATE).edit(); 
 
 StringBuffer sb = new StringBuffer(); 
 
 for (int i = 0; i < adapter.getCount(); i++) { 
  sb.append(adapter.getItem(i).getTime()).append(","); 
 } 
 if (sb.length() > 1) { 
  String content = sb.toString().substring(0, sb.length() - 1); 
  editor.putString(KEY_ALARM_LIST, content); 
 
  System.out.println(content); 
 } else { 
  editor.putString(KEY_ALARM_LIST, null); 
 } 
 editor.commit(); 
 } 
 
 private void readSaveAlarmList() { 
 SharedPreferences sp = getContext().getSharedPreferences( 
  AlarmView.class.getName(), Context.MODE_PRIVATE); 
 String content = sp.getString(KEY_ALARM_LIST, null); 
 
 if (content != null) { 
  String[] timeStrings = content.split(","); 
  for (String string : timeStrings) { 
  adapter.add(new AlarmData(Long.parseLong(string))); 
  } 
 } 
 } 
 
 // 自定义数据类型 
 private static class AlarmData { 
 private long time = 0; 
 private Calendar date; 
 private String timeLabel = ""; 
 
 public AlarmData(long time) { 
  this.time = time; 
  date = Calendar.getInstance(); 
  date.setTimeInMillis(time); 
  timeLabel = String.format("%d月%d日 %d:%d", 
   date.get(Calendar.MONTH) + 1, 
   date.get(Calendar.DAY_OF_MONTH), 
   date.get(Calendar.HOUR_OF_DAY), date.get(Calendar.MINUTE)); 
 } 
 
 public long getTime() { 
  return time; 
 } 
 
 public String getTimeLabel() { 
  return timeLabel; 
 } 
 
 public int getId() { 
  return (int) (getTime() / 1000 / 60); 
 } 
 
 @Override 
 public String toString() { 
  return getTimeLabel(); 
 } 
 
 } 
}

三、计时器
计时器的主要功能就是你先设定一个时间，然后点击开始，时间就会一秒一秒的减少，在这里我么主要用到了Timer这个系统的计时器，这代码中没有上面难懂的地方，有些地方已经给上注释了，所以直接贴代码，可能有些人会不知道Timer怎么用，之后的知识点中都会有提到。

package com.example.clock; 
 
import java.util.Timer; 
import java.util.TimerTask; 
 
import android.R.integer; 
import android.app.AlertDialog; 
import android.content.Context; 
import android.os.Handler; 
import android.text.Editable; 
import android.text.TextUtils; 
import android.text.TextWatcher; 
import android.util.AttributeSet; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.LinearLayout; 
 
public class TimerView extends LinearLayout { 
 
 public TimerView(Context context, AttributeSet attrs) { 
 super(context, attrs); 
 } 
 
 public TimerView(Context context) { 
 super(context); 
 } 
 
 @Override 
 protected void onFinishInflate() { 
 super.onFinishInflate(); 
 
 btnStart = (Button) findViewById(R.id.btnStart); 
 btnPause = (Button) findViewById(R.id.btnPause); 
 btnResume = (Button) findViewById(R.id.btnResume); 
 btnReset = (Button) findViewById(R.id.btnReset); 
 
 btnStart.setOnClickListener(new OnClickListener() { 
 
  @Override 
  public void onClick(View v) { 
  startTimer(); 
  btnStart.setVisibility(View.GONE); 
  btnPause.setVisibility(View.VISIBLE); 
  btnReset.setVisibility(View.VISIBLE); 
  } 
 }); 
  
 btnPause.setOnClickListener(new OnClickListener() { 
  
  @Override 
  public void onClick(View v) { 
  stopTimer(); 
  btnPause.setVisibility(View.GONE); 
  btnResume.setVisibility(View.VISIBLE); 
  } 
 }); 
  
 btnResume.setOnClickListener(new OnClickListener() { 
  
  @Override 
  public void onClick(View v) { 
  startTimer(); 
  btnPause.setVisibility(View.VISIBLE); 
  btnResume.setVisibility(View.GONE); 
  } 
 }); 
 btnReset.setOnClickListener(new OnClickListener() { 
  
  @Override 
  public void onClick(View v) { 
  stopTimer(); 
  etHour.setText("00"); 
  etMin.setText("00"); 
  etSec.setText("00"); 
   
  btnReset.setVisibility(View.GONE); 
  btnResume.setVisibility(View.GONE); 
  btnPause.setVisibility(View.GONE); 
  btnStart.setVisibility(View.VISIBLE); 
  } 
 }); 
 
 etHour = (EditText) findViewById(R.id.etHour); 
 etMin = (EditText) findViewById(R.id.etMin); 
 etSec = (EditText) findViewById(R.id.etSec); 
 
 etHour.setText("00"); 
 etHour.addTextChangedListener(new TextWatcher() { 
 
  @Override 
  public void onTextChanged(CharSequence s, int start, int before, 
   int count) { 
  /* 
   * 这个方法是在Text改变过程中触发调用的， 它的意思就是说在原有的文本s中， 
   * 从start开始的count个字符替换长度为before的旧文本， 
   * 注意这里没有将要之类的字眼，也就是说一句执行了替换动作。 
   */ 
  if (!TextUtils.isEmpty(s)) { 
 
   int value = Integer.parseInt(s.toString()); 
 
   if (value > 59) { 
   etHour.setText("59"); 
   } else if (value < 0) { 
   etHour.setText("00"); 
   } 
  } 
  checkToEnableBtnStart(); 
  } 
 
  @Override 
  public void beforeTextChanged(CharSequence s, int start, int count, 
   int after) { 
  } 
 
  @Override 
  public void afterTextChanged(Editable s) { 
  } 
 }); 
 etMin.setText("00"); 
 etMin.addTextChangedListener(new TextWatcher() { 
 
  @Override 
  public void onTextChanged(CharSequence s, int start, int before, 
   int count) { 
  if (!TextUtils.isEmpty(s)) { 
 
   int value = Integer.parseInt(s.toString()); 
 
   if (value > 59) { 
   etMin.setText("59"); 
   } else if (value < 0) { 
   etMin.setText("00"); 
   } 
  } 
  checkToEnableBtnStart(); 
  } 
 
  @Override 
  public void beforeTextChanged(CharSequence s, int start, int count, 
   int after) { 
  } 
 
  @Override 
  public void afterTextChanged(Editable s) { 
  } 
 }); 
 etSec.setText("00"); 
 etSec.addTextChangedListener(new TextWatcher() { 
 
  @Override 
  public void onTextChanged(CharSequence s, int start, int before, 
   int count) { 
  if (!TextUtils.isEmpty(s)) { 
 
   int value = Integer.parseInt(s.toString()); 
 
   if (value > 59) { 
   etSec.setText("59"); 
   } else if (value < 0) { 
   etSec.setText("00"); 
   } 
  } 
  checkToEnableBtnStart(); 
  } 
 
  @Override 
  public void beforeTextChanged(CharSequence s, int start, int count, 
   int after) { 
  } 
 
  @Override 
  public void afterTextChanged(Editable s) { 
  } 
 }); 
 
 btnStart.setVisibility(View.VISIBLE); 
 btnStart.setEnabled(false); 
 btnPause.setVisibility(View.GONE); 
 btnResume.setVisibility(View.GONE); 
 btnReset.setVisibility(View.GONE); 
 } 
 
 private void checkToEnableBtnStart() { 
 btnStart.setEnabled((!TextUtils.isEmpty(etHour.getText()) && Integer 
  .parseInt(etHour.getText().toString()) > 0) 
  || (!TextUtils.isEmpty(etMin.getText()) && Integer 
   .parseInt(etMin.getText().toString()) > 0) 
  || (!TextUtils.isEmpty(etSec.getText()) && Integer 
   .parseInt(etSec.getText().toString()) > 0)); 
 } 
 
 private void startTimer() { 
 if (timerTask == null) { 
  allTimeCount = Integer.parseInt(etHour.getText().toString()) * 60 
   * 60 + Integer.parseInt(etMin.getText().toString()) * 60 
   + Integer.parseInt(etSec.getText().toString()); 
  timerTask = new TimerTask() { 
 
  @Override 
  public void run() { 
   allTimeCount--; 
   handle.sendEmptyMessage(MSG_WHAT_TIME_TICK); 
   if (allTimeCount <= 0) { 
   handle.sendEmptyMessage(MSG_WHAT_TIME_IS_UP); 
   stopTimer(); 
   } 
  } 
  }; 
  timer.schedule(timerTask, 1000, 1000); 
 } 
 } 
 private void stopTimer(){ 
 if (timerTask!=null) { 
  timerTask.cancel(); 
  timerTask=null; 
 } 
 } 
 
 private Handler handle = new Handler(){ 
  
 public void handleMessage(android.os.Message msg) { 
  switch (msg.what) { 
  case MSG_WHAT_TIME_TICK: 
  int hour = allTimeCount/60/60; 
  int min = (allTimeCount/60)%60; 
  int sec = allTimeCount%60; 
   
  etHour.setText(hour+""); 
  etMin.setText(min+""); 
  etSec.setText(sec+""); 
  break; 
   
  case MSG_WHAT_TIME_IS_UP: 
  new AlertDialog.Builder(getContext()) 
  .setTitle("Time is up!") 
  .setMessage("Time is up!") 
  .setNegativeButton("Cancle", null).show(); 
   
  btnReset.setVisibility(View.GONE); 
  btnResume.setVisibility(View.GONE); 
  btnPause.setVisibility(View.GONE); 
  btnStart.setVisibility(View.VISIBLE); 
  break; 
 
  default: 
  break; 
  } 
 }; 
 }; 
 private static final int MSG_WHAT_TIME_IS_UP = 1; 
 private static final int MSG_WHAT_TIME_TICK = 2; 
 
 private int allTimeCount = 0; 
 private Timer timer = new Timer(); 
 private TimerTask timerTask = null; 
 private Button btnStart, btnPause, btnResume, btnReset; 
 private EditText etHour, etMin, etSec; 
 
}

四、秒表
最后的秒表相信大家都不陌生，用到的知识正好之前的三个都有讲到，只要明白前三个后，这个就不难理解了。

package com.example.clock; 
 
import java.util.ArrayList; 
import java.util.Timer; 
import java.util.TimerTask; 
 
import android.content.Context; 
import android.os.Handler; 
import android.util.AttributeSet; 
import android.view.View; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.ListView; 
import android.widget.TextView; 
 
public class StopWatchView extends LinearLayout { 
 
 private TextView tvHour,tvMin,tvSec,tvMsec; 
 private Button btnStart,btnPause,btnResume,btnReset,btnLap; 
 private ListView lvTimeList; 
 private ArrayAdapter<String> adapter; 
 public StopWatchView(Context context, AttributeSet attrs) { 
 super(context, attrs); 
 } 
 
 @Override 
 protected void onFinishInflate() { 
 super.onFinishInflate(); 
  
 tvHour = (TextView) findViewById(R.id.timeHour); 
 tvHour.setText("0"); 
 tvMin = (TextView) findViewById(R.id.timeMin); 
 tvMin.setText("0"); 
 tvSec = (TextView) findViewById(R.id.timeSec); 
 tvSec.setText("0"); 
 tvMsec = (TextView) findViewById(R.id.timeMsec); 
 tvMsec.setText("0"); 
  
 btnStart = (Button) findViewById(R.id.btnSWStart); 
 btnPause = (Button) findViewById(R.id.btnSWPause); 
 btnResume = (Button) findViewById(R.id.btnSWResume); 
 btnLap = (Button) findViewById(R.id.btnSWLap); 
 btnReset = (Button) findViewById(R.id.btnSWReset); 
  
 btnStart.setOnClickListener(new OnClickListener() { 
  
  @Override 
  public void onClick(View v) { 
  startTimer(); 
  btnStart.setVisibility(View.GONE); 
  btnPause.setVisibility(View.VISIBLE); 
  btnLap.setVisibility(View.VISIBLE); 
  } 
 }); 
 btnPause.setOnClickListener(new OnClickListener() { 
  
  @Override 
  public void onClick(View v) { 
  stopTimer(); 
  btnPause.setVisibility(View.GONE); 
  btnResume.setVisibility(View.VISIBLE); 
  btnLap.setVisibility(View.GONE); 
  btnReset.setVisibility(View.VISIBLE); 
  } 
 }); 
 btnResume.setOnClickListener(new OnClickListener() { 
  
  @Override 
  public void onClick(View v) { 
  startTimer(); 
  btnResume.setVisibility(View.GONE); 
  btnPause.setVisibility(View.VISIBLE); 
  btnLap.setVisibility(View.VISIBLE); 
  btnReset.setVisibility(View.GONE); 
  } 
 }); 
 btnReset.setOnClickListener(new OnClickListener() { 
  
  @Override 
  public void onClick(View v) { 
  stopTimer(); 
  tenMSecs = 0; 
  adapter.clear(); 
  btnReset.setVisibility(View.GONE); 
  btnLap.setVisibility(View.GONE); 
  btnPause.setVisibility(View.GONE); 
  btnResume.setVisibility(View.GONE); 
  btnStart.setVisibility(View.VISIBLE); 
  } 
 }); 
 btnLap.setOnClickListener(new OnClickListener() { 
  
  @Override 
  public void onClick(View v) { 
  adapter.insert(String.format("%d:%d:%d.%d", tenMSecs/100/60/60,tenMSecs/100/60%60,tenMSecs/100%60,tenMSecs%100), 0); 
  } 
 }); 
 btnLap.setVisibility(View.GONE); 
 btnPause.setVisibility(View.GONE); 
 btnResume.setVisibility(View.GONE); 
 btnReset.setVisibility(View.GONE); 
  
 lvTimeList = (ListView) findViewById(R.id.lvWatchTime); 
 adapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_list_item_1); 
 lvTimeList.setAdapter(adapter); 
  
 showTimerTask = new TimerTask() { 
  
  @Override 
  public void run() { 
  handle.sendEmptyMessage(MSG_WHAT_SHOW_TIME); 
  } 
 }; 
 timer.schedule(showTimerTask, 200, 200); 
 } 
 
 private void startTimer(){ 
 if (timerTask == null) { 
  timerTask = new TimerTask() { 
   
  @Override 
  public void run() { 
   tenMSecs++; 
  } 
  }; 
  timer.schedule(timerTask, 10, 10); 
 } 
 } 
 private void stopTimer(){ 
 if (timerTask != null) { 
  timerTask.cancel(); 
  timerTask = null; 
 } 
 } 
 
 private int tenMSecs = 0; 
 private Timer timer =new Timer(); 
 private TimerTask timerTask = null; 
 private TimerTask showTimerTask = null; 
 private static final int MSG_WHAT_SHOW_TIME = 1; 
 
 private Handler handle = new Handler(){ 
 public void handleMessage(android.os.Message msg) { 
  switch (msg.what) { 
  case MSG_WHAT_SHOW_TIME: 
  tvHour.setText(tenMSecs/100/60/60+""); 
  tvMin.setText(tenMSecs/100/60%60+""); 
  tvSec.setText(tenMSecs/100%60+""); 
  tvMsec.setText(tenMSecs%100+""); 
  break; 
 
  default: 
  break; 
  } 
 }; 
 }; 
 public void onDestroy() { 
 timer.cancel(); 
 } 
 
}

到此为止，自己的第一个实战算是完成了，但是就是界面很low，这个只是把基本的功能实现了，但是在界面上没有做很大的完善，在之后的实战中会慢慢改进的。

源码下载：Android多功能时钟

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