[Android]TimeClock 顯示程式開始執行的時間及現在時間

<TimerClock.java>

   1: package com.android.timerclock;

   2:  

   3: import java.text.SimpleDateFormat;

   4:  

   5: import android.app.Activity;

   6: import android.os.Bundle;

   7: import android.os.Handler;

   8: import android.view.View;

   9: import android.view.View.OnClickListener;

  10: import android.widget.Button;

  11: import android.widget.TextView;

  12:  

  13: public class TimerClock extends Activity {

  14:     

  15:     private Long startTime;

  16:     private Handler handler = new Handler();

  17:     private Button b1;

  18:     private TextView tv1, tv2, tv3;

  19:     private SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");

  20:  

  21:     @Override

  22:     public void onCreate(Bundle savedInstanceState) {

  23:         super.onCreate(savedInstanceState);

  24:         setContentView(R.layout.main);

  25:         findViews();

  26:         setButtonListeners();

  27:         startRunProcess();

  28:     }

  29:     

  30:     

  31:     private void findViews(){

  32:         tv1 = (TextView) findViewById(R.id.tvStartTime);

  33:         tv2 = (TextView) findViewById(R.id.tvNowTime);

  34:         tv3 = (TextView) findViewById(R.id.timer);

  35:            b1 = (Button)findViewById(R.id.btnExit); 

  36:     }

  37:     

  38:     

  39:     private void startRunProcess() {

  40:         // 利用 System.currentTimeMillis() 讀取系統時間

  41:         startTime = System.currentTimeMillis();

  42:         tv1.setText("起始時間: "+format.format(startTime));

  43:         // 調用 Handler 的 postDelayed 方法

  44:         // 將 要執行的線程對象 updateTimerThread 放入隊列中, 當等待時間 (1000毫秒)結束後, 執行線程對象 updateTimerThread

  45:         handler.postDelayed(updateTimerThread, 1000);

  46:     }

  47:     

  48:     

  49:     private Runnable updateTimerThread = new Runnable() {

  50:         public void run() {

  51:             // 利用 System.currentTimeMillis() 讀取系統時間

  52:             Long nowTime = System.currentTimeMillis();

  53:             tv2.setText("現在時間: "+format.format(nowTime));

  54:             

  55:             Long spentTime = nowTime- startTime;

  56:             //計算目前已過分鐘數

  57:             Long minius = (spentTime/1000)/60;

  58:             //計算目前已過秒數

  59:             Long seconds = (spentTime/1000) % 60;

  60:             tv3.setText("執行時間: "+minius+" 分 "+seconds+" 秒");

  61:             // 調用 Handler 的 postDelayed 方法

  62:             // 將 要執行的線程對象 updateTimerThread 放入隊列中, 當等待時間 (1000毫秒)結束後, 執行線程對象 updateTimerThread

  63:             handler.postDelayed(this, 1000);

  64:         }

  65:     };

  66:  

  67:     private void setButtonListeners(){

  68:         b1.setOnClickListener(new OnClickListener(){

  69:             public void onClick(View v) {

  70:                 // 調用 Handler 的 removeCallbacks 方法, 刪除隊列中未執行的線程對象

  71:                 handler.removeCallbacks(updateTimerThread);

  72:                 android.os.Process.killProcess(android.os.Process.myPid());

  73:             }

  74:         });

  75:     }

  76:  

  77:  

  78: }

<main.xml>

   1: <?xml version="1.0" encoding="utf-8"?>

   2: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

   3:     android:layout_width="fill_parent"

   4:     android:layout_height="fill_parent"

   5:     android:orientation="vertical"     >

   6:  

   7:     <TextView

   8:         android:id="@+id/tvStartTime"

   9:         android:layout_width="wrap_content"

  10:         android:layout_height="wrap_content"

  11:         android:text="@string/strStartTime"

  12:         android:textSize="30dp" />

  13:  

  14:     <TextView

  15:         android:id="@+id/tvNowTime"

  16:         android:layout_width="wrap_content"

  17:         android:layout_height="wrap_content"

  18:         android:text="@string/strNowTime"

  19:         android:textSize="30dp" />

  20:  

  21:  

  22:     <TextView

  23:         android:id="@+id/timer"

  24:         android:layout_width="wrap_content"

  25:         android:layout_height="wrap_content"

  26:         android:text="@string/strDuration"

  27:         android:textSize="30sp" >

  28:  

  29:     </TextView>

  30:  

  31:  

  32:  

  33:     <Button

  34:         android:id="@+id/btnExit"

  35:         android:layout_width="wrap_content"

  36:         android:layout_height="wrap_content"

  37:         android:text="@string/strExit" />

  38:  

  39: </LinearLayout>

<strings.xml>

   1: <?xml version="1.0" encoding="utf-8"?>

   2: <resources>

   3:  

   4:     <string name="hello">Hello World, TimerClock!</string>

   5:     <string name="app_name">TimerClock</string>

   6:     <string name="strExit">離開</string>

   7:     <string name="strDuration">執行時間：0:0</string>

   8:     <string name="strNowTime">現在時間：0:0</string>

   9:     <string name="strStartTime">起始時間：0:0</string>

  10:     

  11: </resources>