Android实现秒表功能
本文实例为大家分享了android实现秒表功能的具体代码，供大家参考，具体内容如下
设计完成一个秒表，具备启停功能，正确使用工作线程完成界面刷新
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <linearlayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:gravity="center"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:text="秒表" android:textsize="30sp" /> </linearlayout> <linearlayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:text="@string/_00_00_00" android:textsize="30sp" android:id="@+id/clock" /> </linearlayout> <linearlayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_gravity="center"> <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="清零" android:id="@+id/init" /> <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="计时" android:id="@+id/start" /> <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="停止" android:id="@+id/stop" /> </linearlayout> </linearlayout>
androidmanifest.xml
将activity,service在andoidmainfest.xml中注册
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.ex_5"> <application android:allowbackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundicon="@mipmap/ic_launcher_round" android:supportsrtl="true" android:theme="@style/apptheme"> <activity android:name=".mainaactivity"> <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> <service android:name=".timeservice"> </service> </application> </manifest>
timeservice.java
service服务
package com.example.ex_5;
import android.app.service;
import android.content.intent;
import android.os.ibinder;
import android.util.log;
import androidx.annotation.nullable;
import java.util.date;
public class timeservice extends service {
@nullable
private date starttime = new date();
private long diff;
public thread workthread;
private runnable backgroundwork = new runnable() {
@override
public void run() {
while(!thread.interrupted()){
date endtime = new date();
diff = endtime.gettime()-starttime.gettime();
mainactivity.updategui(diff);
log.i("timeservice:the diff is",string.valueof(diff));
try {
thread.sleep(0);
} catch (interruptedexception e) {
e.printstacktrace();
}
}
}
};
@override
public void oncreate() {
super.oncreate();
log.i("timeservice","oncreate");
workthread=new thread(null,backgroundwork,"workthread");
}
@override
public void onstart(intent intent, int startid) {
super.onstart(intent, startid);
if(!workthread.isalive()){
workthread.start();
}
log.i("timeservice","onstart");
}
@override
public void ondestroy() {
super.ondestroy();
mainactivity.updategui(0);
mainactivity.updatediff(diff);
workthread.interrupt();
log.i("timeservice","ondestroy");
}
public ibinder onbind(intent intent) {
return null;
}
}mainactivity.java
注册按钮响应事件，更新ui界面
package com.example.ex_5;
import android.content.intent;
import android.os.bundle;
import android.os.handler;
import android.util.log;
import android.view.view;
import android.widget.button;
import android.widget.textview;
import androidx.appcompat.app.appcompatactivity;
import java.net.serversocket;
public class mainactivity extends appcompatactivity {
private static handler handler = new handler();
private static textview labelview = null;
private static string time;
private static long _diff = 0;
//更新界面
public static void updategui(long diff) {
diff += _diff;
int hours = (int) diff / (1000 * 60 * 60);
int minutes = (int) (diff - (hours * (1000 * 60 * 60))) / (1000 * 60);
int seconds = (int) (diff - (hours * (1000 * 60 * 60)) - (minutes * (1000 * 60))) / 1000;
time = hours + ":" + minutes + ":" + seconds;
handler.post(refreshlable);
}
//供停止功能使用，用于记录服务结束之时的时间
public static void updatediff(long diff){
_diff = diff;
}
//settext
public static runnable refreshlable = new runnable() {
@override
public void run() {
labelview.settext(time);
}
};
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
button initbutton = findviewbyid(r.id.init);
final button startbutton = findviewbyid(r.id.start);
button stopbutton = findviewbyid(r.id.stop);
labelview = findviewbyid(r.id.clock);
final intent serviceintent = new intent(this, timeservice.class);
startbutton.setonclicklistener(new button.onclicklistener() {
public void onclick(view view) {
log.i("mainactivity","clickstartbutton");
startservice(serviceintent);
}
});
stopbutton.setonclicklistener(new button.onclicklistener(){
@override
public void onclick(view v) {
log.i("the behead diff is",string.valueof(_diff));
log.i("mainactivity","clickstopbutton");
stopservice(serviceintent);
}
});
initbutton.setonclicklistener(new button.onclicklistener(){
@override
public void onclick(view v) {
log.i("mainactivity","clickinitbutton");
_diff = 0;
string text = "00:00:00";
labelview.settext(text);
stopservice(serviceintent);
}
});
}
}以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持萬仟网。
看完文章，还可以扫描下面的二维码下载快手极速版领4元红包
除了扫码领红包之外，大家还可以在快手极速版做签到，看视频，做任务，参与抽奖，邀请好友赚钱）。
邀请两个好友奖最高196元，如下图所示：
