原文鏈接：http://blog.csdn.net/wwj_748/article/details/8120759

手機(jī)沒有秒表，自己想做一個(gè)秒表來(lái)給自己用，現(xiàn)在馬上做出一個(gè)實(shí)例來(lái)，這只是開始，以后做個(gè)界面漂亮的應(yīng)用出來(lái)。廢話不說(shuō)，先上圖：

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源碼：

建立項(xiàng)目：Stopwatch

代碼清單：org/wwj/Stopwatch/Stopwatch.java

[java]?view plaincopy

package?org.wwj.Stopwatch;??

??

import?android.app.Activity;??

import?android.os.Bundle;??

import?android.os.Handler;??

import?android.view.Menu;??

import?android.view.View;??

import?android.view.View.OnClickListener;??

import?android.widget.Button;??

import?android.widget.TextView;??

??

public?class?Stopwatch?extends?Activity?{??

??????

????private?TextView?minText;???????//分??

????private?TextView?secText;???????//秒??

????private?Button?start;???????????//開始按鈕??

????private?Button?stop;????????????//停止按鈕??

????private?boolean?isPaused?=?false;??

????private?String?timeUsed;??

????private?int?timeUsedInsec;??

??????

????private?Handler?uiHandle?=?new?Handler(){??

????????public?void?handleMessage(android.os.Message?msg)?{??

????????????switch(msg.what){??

????????????case?1:??

????????????????if(!isPaused)?{??

????????????????????addTimeUsed();??

????????????????????updateClockUI();??

????????????????}??

????????????????uiHandle.sendEmptyMessageDelayed(1,?1000);??

????????????????break;??

????????????default:?break;??

????????????}??

????????}??

????};??

??????

??????

????@Override??

????public?void?onCreate(Bundle?savedInstanceState)?{??

????????super.onCreate(savedInstanceState);??

????????setContentView(R.layout.activity_stopwatch);??

??????????

????????//獲取界面的控件??

????????minText?=?(TextView)?findViewById(R.id.min);??

????????secText?=?(TextView)?findViewById(R.id.sec);??

????????start?=?(Button)?findViewById(R.id.start);??

????????stop?=?(Button)?findViewById(R.id.stop);??

??????????

??????????

????????//為按鈕Start注冊(cè)監(jiān)聽器??

????????start.setOnClickListener(new?OnClickListener()?{??

??????????????

????????????@Override??

????????????public?void?onClick(View?v)?{??

????????????????//?TODO?Auto-generated?method?stub??

????????????????uiHandle.removeMessages(1);??

????????????????startTime();??

????????????????isPaused?=?false;??

????????????}??

????????});??

??????????

????????//為按鈕stop注冊(cè)監(jiān)聽器??

????????stop.setOnClickListener(new?OnClickListener()?{??

??????????????

????????????@Override??

????????????public?void?onClick(View?v)?{??

????????????????//?TODO?Auto-generated?method?stub??

????????????????isPaused?=?true;??

????????????????timeUsedInsec?=?0;??

????????????}??

????????});??

????}?????

??????

??????

????@Override??

????protected?void?onPause()?{??

????????//?TODO?Auto-generated?method?stub??

????????super.onPause();??

????????isPaused?=?true;??

????}??

??????

??????

????@Override??

????protected?void?onResume()?{??

????????//?TODO?Auto-generated?method?stub??

????????super.onResume();??

????????isPaused?=?false;??

????}??

??????

????private?void?startTime(){??

????????uiHandle.sendEmptyMessageDelayed(1,?1000);??

????}??

??????

????/**?

?????*?更新時(shí)間的顯示?

?????*/??

????private?void?updateClockUI(){??

????????minText.setText(getMin()?+?":");??

????????secText.setText(getSec());??

????}??

??????

????public?void?addTimeUsed(){??

????????timeUsedInsec?=?timeUsedInsec?+?1;??

????????timeUsed?=?this.getMin()?+?":"?+?this.getSec();??

????}??

??????

????public?CharSequence?getMin(){??

????????return?String.valueOf(timeUsedInsec?/?60);??

????}??

??????

????public?CharSequence?getSec(){??

????????int?sec?=?timeUsedInsec?%?60;??

????????return?sec?<?10??"0"?+?sec?:String.valueOf(sec);??

????}??

??????

????@Override??

????public?boolean?onCreateOptionsMenu(Menu?menu)?{??

????????getMenuInflater().inflate(R.menu.activity_stopwatch,?menu);??

????????return?true;??

????}??

??

??????

}??

?

界面布局：res/layout/layout_stopwatch.xml

[html]?view plaincopy

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

????xmlns:tools="http://schemas.android.com/tools"??

????android:id="@+id/LinearLayout1"??

????android:layout_width="match_parent"??

????android:layout_height="match_parent"??

????android:orientation="vertical"?>??

????<LinearLayout???

????????android:orientation="horizontal"??

????????android:layout_width="wrap_content"??

????????android:layout_height="wrap_content"??

????????android:layout_gravity="center_horizontal">??

????????<TextView???

????????????android:id="@+id/min"??

????????????android:layout_width="wrap_content"??

????????????android:layout_height="wrap_content"??

????????????android:textSize="40sp"/>??

????????<TextView???

????????????android:id="@+id/sec"??

????????????android:layout_width="wrap_content"???

????????????android:layout_height="wrap_content"??

????????????android:textSize="40sp"??

????????????android:textColor="#ff0000"/>??

????</LinearLayout>??

????<LinearLayout???

????????android:orientation="horizontal"??

????????android:layout_width="wrap_content"??

????????android:layout_height="wrap_content"??

????????android:layout_gravity="center_horizontal"??

????????>??

????????<Button???

????????????android:id="@+id/start"??

????????????android:layout_width="wrap_content"??

????????????android:layout_height="wrap_content"??

????????????android:text="@string/start"/>??

????????<Button???

????????????android:id="@+id/stop"??

????????????android:layout_width="wrap_content"??

????????????android:layout_height="wrap_content"??

????????????android:text="@string/stop"/>??

????</LinearLayout>??

</LinearLayout>??

總結(jié)

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