计时器

这个简易计时器，实现了简单的计时，点击开始按钮开始计时，点击停止按钮就停止，屏幕现实开始到停止的时间差。在run()方法里已换算成时分秒。

参考博客：http://blog.csdn.net/ithomer/article/details/6903084、http://blog.csdn.net/m_changgong/article/details/6844441

代码仅供参考：

strings.xml

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<string
name="app_name">计时器</string>  

<string
name="text_time">00:00</string> 

<string
name="button_start">记录</string> 

<string
name="button_stop">取消</string> 

<string name="app_name">计时器</string>
<string name="text_time">00:00</string>
<string name="button_start">记录</string>
<string name="button_stop">取消</string>

activity_main.xml

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

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

    android:layout_width="match_parent" 

    android:layout_height="match_parent" 

    android:background="#FFFFFF" 

    android:orientation="vertical"
> 
 
    <TextView 

        android:id="@+id/time" 

        android:layout_width="match_parent" 

        android:layout_height="match_parent" 

        android:gravity="center" 

        android:textSize="30sp" 

        android:text="@string/text_time"
/> 
 
    <RelativeLayout 

        android:layout_width="match_parent" 

        android:layout_height="wrap_content" 

        android:layout_alignParentBottom="true" 

        android:layout_margin="20dp" 

        android:orientation="horizontal"
> 
 
        <Button 

            android:id="@+id/button_start" 

            android:layout_width="wrap_content" 

            android:layout_height="wrap_content" 

            android:layout_alignParentLeft="true" 

            android:layout_gravity="top|right" 

            android:text="@string/button_start"
/> 
 
        <Button 

            android:id="@+id/button_stop" 

            android:layout_width="wrap_content" 

            android:layout_height="wrap_content" 

            android:layout_alignParentRight="true" 

            android:layout_gravity="top|right" 

            android:text="@string/button_stop"
/> 
    </RelativeLayout> 

 
</RelativeLayout> 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
android:orientation="vertical" >

<TextView
android:id="@+id/time"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textSize="30sp"
android:text="@string/text_time" />

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_margin="20dp"
android:orientation="horizontal" >

<Button
android:id="@+id/button_start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_gravity="top|right"
android:text="@string/button_start" />

<Button
android:id="@+id/button_stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_gravity="top|right"
android:text="@string/button_stop" />
</RelativeLayout>

</RelativeLayout>

MainActivity.java

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import android.app.Activity; 

import android.os.Bundle; 
import android.os.Handler; 

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

import android.widget.TextView; 

 
/**
* 计时器
*/ 
public class MainActivity
extends Activity implements OnClickListener { 

    private TextView timer_time; 

     
    private int count =
0; 
    private int s =
0; 
    private int m =
0; 
    private int h =
0; 
 
    public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

 
        setContentView(R.layout.activity_main); 
        timer_time = (TextView) findViewById(R.id.time); 

 
//      handler.postDelayed(runnable, 1000); 

         
        this.findViewById(R.id.button_start).setOnClickListener(this); 

        this.findViewById(R.id.button_stop).setOnClickListener(this); 

    } 
 
    private Handler handler =
new Handler(); 
    private Runnable runnable =
new Runnable() { 
        @Override 

        public void run() { 

            String time = ""; 

            count++; 
            if (count <
60) { // 小于60s 

                if (count < 10) { 

                    time = "00:0" + count; 

                } else { 
                    time = "00:" + count; 

                } 
            } else {
// 大于等于60s 
                m = count / 60;
// 取整数，分钟 
                s = count % 60;
// 取余数，秒数 
                if (m < 10) {
// 小于10分钟 
                    if (s <
10) {  
                        time = "0" + m +
":0" + s; 
                    } else { 

                        time = "0" + m +
":" + s; 
                    } 
                } else { 
                    if (s <
10) { 
                        time = m + ":0" + s; 

                    } else { 

                        time = m + ":" + s; 

                    } 
                } 
                if (m >
60) { 
                    h = m / 60; 

                    time = h + ":" + m +
":" + s; 
                } 
            } 
            timer_time.setText(time); 
             
            handler.postDelayed(this,
1000); 
        } 
    }; 
 
    @Override 
    public void onClick(View v) { 

        switch (v.getId()) { 

        case R.id.button_start: 

            handler.postDelayed(runnable, 1000); 

            break; 

             
        case R.id.button_stop: 

            count = 0; 
            handler.removeCallbacks(runnable); 
            break; 
 
        default: 
            break; 

        } 
    } 
} 

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;

/**
* 计时器
*/
public class MainActivity extends Activity implements OnClickListener {
private TextView timer_time;

private int count = 0;
private int s = 0;
private int m = 0;
private int h = 0;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);
timer_time = (TextView) findViewById(R.id.time);

//		handler.postDelayed(runnable, 1000);

this.findViewById(R.id.button_start).setOnClickListener(this);
this.findViewById(R.id.button_stop).setOnClickListener(this);
}

private Handler handler = new Handler();
private Runnable runnable = new Runnable() {
@Override
public void run() {
String time = "";
count++;
if (count < 60) { // 小于60s
if (count < 10) {
time = "00:0" + count;
} else {
time = "00:" + count;
}
} else { // 大于等于60s
m = count / 60; // 取整数，分钟
s = count % 60; // 取余数，秒数
if (m < 10) { // 小于10分钟
if (s < 10) {
time = "0" + m + ":0" + s;
} else {
time = "0" + m + ":" + s;
}
} else {
if (s < 10) {
time = m + ":0" + s;
} else {
time = m + ":" + s;
}
}
if (m > 60) {
h = m / 60;
time = h + ":" + m + ":" + s;
}
}
timer_time.setText(time);

handler.postDelayed(this, 1000);
}
};

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button_start:
handler.postDelayed(runnable, 1000);
break;

case R.id.button_stop:
count = 0;
handler.removeCallbacks(runnable);
break;

default:
break;
}
}
}

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