android Stopwatch實例

         Stopwatch 實例
[java] 
package net.baisoft.stopwatch; 
 
import java.util.ArrayList; 
import java.util.Date; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
 
import android.app.Activity; 
import android.content.SharedPreferences; 
import android.content.SharedPreferences.Editor; 
import android.os.Bundle; 
import android.os.Handler; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 
import android.widget.Toast; 
 
public class MainActivity extends Activity implements Runnable { 
     
    /**
     * ��ǰ����ʱ��
     */ 
    private long time = 0; 
     
    /**
     * ��ʼʱ��
     */ 
    private long startTime; 
 
    private Handler handler; 
     
    /**
     * ������ʾʱ��
     */ 
    private TextView timeView; 
     
    /**
     * �����б���ʾ�ּ�ʱ��
     */ 
    private ListView listView; 
     
    /**
     * ��ʼ��ť
     */ 
    private Button startButton; 
     
    /**
     * ��ͣ��ť
     */ 
    private Button pauseButton; 
     
    /**
     * �ּǰ�ť
     */ 
    private Button markButton; 
     
    /**
     * ���ð�ť
     */ 
    private Button resetButton; 
     
    /**
     * �ּ�ʱ�����
     */ 
    private List<Long> marks; 
     
    /**
     * ���ĵ�ǰ״̬
     * ��Ϊ�������С���ͣ��ֹͣ����״̬
     */ 
    private int state = 0; 
     
    private  static int STATE_RUNNING = 1; 
    private  static int STATE_STOP = 0; 
    private  static int STATE_PAUSE = 2; 
     
     
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
         
        //��ȡ������Ϣ��ƫ�� �� 
        readEnvironment(); 
        Toast.makeText(this, "�����Ѷ�ȡ", Toast.LENGTH_LONG).show(); 
         
        //��ʼ��ť 
        startButton = (Button)findViewById(R.id.start); 
        startButton.setOnClickListener(new OnClickListener() { 
            @Override 
            public void onClick(View view) { 
                onStartClick(view); 
            } 
        }); 
         
        //��ͣ��ť 
        pauseButton = (Button)findViewById(R.id.pause); 
        pauseButton.setOnClickListener(new OnClickListener() { 
            @Override 
            public void onClick(View view) { 
                onPauseClick(view); 
            } 
        }); 
         
        //�ּǰ�ť 
        markButton = (Button) findViewById(R.id.mark); 
        markButton.setOnClickListener(new OnClickListener() { 
            @Override 
            public void onClick(View view) { 
                onMarkClick(view); 
            } 
        }); 
         
        //���ð�ť 
        resetButton = (Button) findViewById(R.id.reset); 
        resetButton.setOnClickListener(new OnClickListener() { 
            @Override 
            public void onClick(View view) { 
                onResetClick(view); 
            } 
        }); 
         
        timeView = (TextView) findViewById(R.id.timeView); 
        listView = (ListView) findViewById(R.id.ListView01); 
         
        //���� handler 
        handler = new Handler(); 
         
        // ���ø���ť 
        setButtons(); 
         
        //����ʱ����ʾ 
        if (state == STATE_STOP){ 
            timeView.setText("Let's Run!"); 
        } else if(state == STATE_PAUSE){ 
            timeView.setText(getFormatTime(time)); 
        } 
         
        //��ʾ�б� 
        refreshMarkList(); 
    } 
 
    /**
     * ���״̬���ð�ť��ʾ�ڲ���ʾ
     */ 
    private void setButtons() { 
        switch (state) { 
        case 1://����������� 
            startButton.setVisibility(View.GONE); 
            pauseButton.setVisibility(View.VISIBLE); 
            markButton.setVisibility(View.VISIBLE); 
            resetButton.setVisibility(View.GONE); 
            resetButton.setEnabled(false); 
            break; 
        case 2://�����ͣ�� 
            startButton.setVisibility(View.VISIBLE); 
            pauseButton.setVisibility(View.GONE); 
            markButton.setVisibility(View.GONE); 
            resetButton.setVisibility(View.VISIBLE); 
            resetButton.setEnabled(true); 
            break; 
        case 0://���ֹͣ�� 
            startButton.setVisibility(View.VISIBLE); 
            pauseButton.setVisibility(View.GONE); 
            markButton.setVisibility(View.GONE); 
            resetButton.setVisibility(View.VISIBLE); 
            resetButton.setEnabled(false); 
            break; 
        default: 
            break; 
        } 
    } 
 
    /**
     * ��ȡ����
     */ 
    @SuppressWarnings("unchecked") 
    private void readEnvironment() { 
        SharedPreferences sharedPreferences = getSharedPreferences("environment", MODE_PRIVATE); 
        state = sharedPreferences.getInt("state", STATE_STOP); 
        startTime = sharedPreferences.getLong("startTime", 0); 
        time = sharedPreferences.getLong("time", 0); 
         
        marks = new ArrayList<Long>(); 
        SharedPreferences sharedPreferencesMarks = getSharedPreferences("marks", MODE_PRIVATE); 
        Map<String, Long> mapMarks = (Map<String, Long>) sharedPreferencesMarks.getAll(); 
        for (int i = 0; i < mapMarks.size(); i++){ 
            Long mark = mapMarks.get("" + i); 
            marks.add(mark); 
        } 
         
    } 
    /**
     * ���滷��
     */ 
    private void saveEnvironment() { 
        SharedPreferences sharedPreferences = getSharedPreferences("environment", MODE_PRIVATE); 
        Editor editor = sharedPreferences.edit(); 
        editor.putInt("state", state); 
        editor.putLong("time", time); 
        editor.putLong("startTime", startTime); 
        editor.commit(); 
         
        //����ּ���� 
        SharedPreferences sharedPreferencesMarks = getSharedPreferences("marks", MODE_PRIVATE); 
        Editor editorMarks = sharedPreferencesMarks.edit(); 
        editorMarks.clear(); 
        for(Long mark : marks){ 
            editorMarks.putLong(""  + marks.indexOf(mark), mark.longValue()); 
        } 
        editorMarks.commit(); 
    } 
 
    @Override 
    protected void onPause() { 
        super.onPause(); 
        if (state == STATE_RUNNING){//����������� 
            handler.removeCallbacks(this); 
        } 
         
    } 
 
 
    @Override 
    protected void onDestroy() { 
        super.onDestroy(); 
        //���滷�� 
        saveEnvironment(); 
        Toast.makeText(this, "��ǰ�����ѱ���", Toast.LENGTH_LONG).show(); 
    } 
 
    @Override 
    protected void onResume() { 
        super.onResume(); 
        if (state == STATE_RUNNING){//����������� 
            handler.post(this); 
        } 
    } 
 
    /**
     * �������
     * @param view
     */ 
    protected void onResetClick(View view) { 
        //����״̬Ϊֹͣ 
        state = STATE_STOP; 
         
        //����ˢ�� 
        if (state == STATE_RUNNING){//����������� 
            handler.removeCallbacks(this); 
        } 
         
        //��ʼ���ּ����� 
        marks = new ArrayList<Long>(); 
        refreshMarkList(); 
         
        //����ʱ����ʾ 
        time = 0; 
        timeView.setText(getFormatTime(time)); 
         
        // ���ø���ť 
        setButtons(); 
    } 
 
    /**
     * �����ͣ
     * @param view
     */ 
    protected void onPauseClick(View view) { 
        //����ˢ�� 
        if (state == STATE_RUNNING){//����������� 
            handler.removeCallbacks(this); 
        } 
         
        //����״̬Ϊ��ͣ 
        state = STATE_PAUSE; 
         
        // ���ø���ť 
        setButtons(); 
    } 
 
    /**
     * �����ʼ
     * @param view
     */ 
    protected void onStartClick(View view) { 
        startTime = new Date().getTime() - time; 
         
        handler.post(this); 
         
        //��ʼ���ּ����� 
        marks = new ArrayList<Long>(); 
         
        //����״̬Ϊ�������� 
        state = STATE_RUNNING; 
         
        // ���ø���ť 
        setButtons(); 
    } 
 
    /**
     * ����ּ�
     * 
     * @param view
     */ 
    protected void onMarkClick(View view) { 
         
        if(time == 0){ 
            return; 
        } 
        // ��ӷּ����, ���ļ�����ǰ�� 
        marks.add(0, time); 
         
        //ˢ���б� 
        refreshMarkList(); 
    } 
 
    /**
     * ˢ���б�
     */ 
    private void refreshMarkList() { 
        //��ʾ 
        List<Map<String, Object>> data = new ArrayList<Map<String,Object>>(); 
        int no = marks.size();//��� 
        for(long mark : marks){ 
            Map<String, Object> map = new HashMap<String, Object>(); 
            map.put("mark", getFormatTime(mark)); 
            map.put("no", this.getString(R.string.mark) + no); 
            no--; 
            data.add(map); 
             
        } 
        String[] from = new String[]{"no","mark"}; 
        int[] to = new int[]{R.id.no, R.id.time}; 
        SimpleAdapter simpleAdapter = new SimpleAdapter(this, data, R.layout.item, from, to); 
        listView.setAdapter(simpleAdapter); 
    } 
    @Override 
    public void run() { 
        handler.postDelayed(this, 50); 
        time = new Date().getTime() - startTime; 
        timeView.setText(getFormatTime(time)); 
    } 
 
    /**
     * �õ�һ����ʽ����ʱ��
     * 
     * @param time
     *          ʱ�� ����
     * @return �֣��룺����
     */ 
    private String getFormatTime(long time) { 
        long millisecond = time % 1000; 
        long second = (time / 1000) % 60; 
        long minute = time / 1000 / 60; 
         
        //�����µ�ֻ��ʾһλ 
        String strMillisecond = "" + (millisecond / 100); 
        //����ʾ��λ 
        String strSecond = ("00" + second).substring(("00" + second).length() - 2); 
        //����ʾ��λ 
        String strMinute = ("00" + minute).substring(("00" + minute).length() - 2); 
         
        return strMinute + ":" + strSecond + ":" + strMillisecond; 
    } 
} 
作者：chang_xing