计时表stop watch
import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class Main extends Activity implements OnClickListener{ final int MSG_START_TIMER = 0; final int MSG_STOP_TIMER = 1; final int MSG_UPDATE_TIMER = 2; Stopwatch timer = new Stopwatch(); final int REFRESH_RATE = 100; Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch (msg.what) { case MSG_START_TIMER: timer.start(); //start timer mHandler.sendEmptyMessage(MSG_UPDATE_TIMER); break; case MSG_UPDATE_TIMER: tvTextView.setText(""+ timer.getElapsedTime()); mHandler.sendEmptyMessageDelayed(MSG_UPDATE_TIMER,REFRESH_RATE); //text view is updated every second, break; //though the timer is still running case MSG_STOP_TIMER: mHandler.removeMessages(MSG_UPDATE_TIMER); // no more updates. timer.stop();//stop timer tvTextView.setText(""+ timer.getElapsedTime()); break; default: break; } } }; TextView tvTextView; Button btnStart,btnStop; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tvTextView = (TextView)findViewById(R.id.TextView01); btnStart = (Button)findViewById(R.id.Button01); btnStop= (Button)findViewById(R.id.Button02); btnStart.setOnClickListener(this); btnStop.setOnClickListener(this); } public void onClick(View v) { if(btnStart == v) { mHandler.sendEmptyMessage(MSG_START_TIMER); }else if(btnStop == v){ mHandler.sendEmptyMessage(MSG_STOP_TIMER); } }}/* Copyright (c) 2005, Corey Goldberg StopWatch.java is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.*/public class StopWatch { private long startTime = 0; private long stopTime = 0; private boolean running = false; public void start() { this.startTime = System.currentTimeMillis(); this.running = true; } public void stop() { this.stopTime = System.currentTimeMillis(); this.running = false; } //elaspsed time in milliseconds public long getElapsedTime() { long elapsed; if (running) { elapsed = (System.currentTimeMillis() - startTime); } else { elapsed = (stopTime - startTime); } return elapsed; } //elaspsed time in seconds public long getElapsedTimeSecs() { long elapsed; if (running) { elapsed = ((System.currentTimeMillis() - startTime) / 1000); } else { elapsed = ((stopTime - startTime) / 1000); } return elapsed; } } http://www.goldb.org/stopwatchjava.html
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