Android开发之小程序-秒表

原文链接：/article/1470860.html

手机没有秒表，自己想做一个秒表来给自己用，现在马上做出一个实例来，这只是开始，以后做个界面漂亮的应用出来。废话不说，先上图：



源码：

建立项目：Stopwatch

代码清单：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; //开始按钮

private Button stop; //停止按钮

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);

//获取界面的控件

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

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

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

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

//为按钮Start注册监听器

start.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

uiHandle.removeMessages(1);

startTime();

isPaused = false;

}

});

//为按钮stop注册监听器

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);

}

/**

* 更新时间的显示

*/

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>