android利用service完成计时功能

本文为大家分享了android service计时功能的具体代码，供大家参考，具体内容如下

源码下载地址：https://github.com/luoye123/timing

1、首先建立主页面的设计：activity_time.xml

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/self_driving_wait_ll"
 android:layout_width="match_parent"
 android:layout_height="match_parent">


 <linearlayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:gravity="center"
 android:orientation="vertical">

 <textview
  android:id="@+id/tv_time"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_centerinparent="true"
  android:layout_margintop="20.0dp"
  android:gravity="center_horizontal"
  android:text="00:00:00"
  android:textsize="88.0sp" />
 </linearlayout>
</relativelayout>

2、activity的建立：timeactivity

public class timeactivity extends appcompatactivity {

 public static string time_changed_action = "com.yy.time.time_changed_action";
 public static textview tv_time;
 private sharedpreferencesutil util;

 @override
 public void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_time);
 tv_time= (textview) findviewbyid(r.id.tv_time);
 util=new sharedpreferencesutil(this);
 util.savestring(mycontant.starttime, stringutils.gettime());
 startservice(new intent(this, timeservice.class));

 }
}

3、service的建立：timeservice

public class timeservice extends service {
private string tag = "timeservice";
private timer timer = null;
private intent timeintent = null;
private sharedpreferencesutil util;

@override
public void oncreate() {
 super.oncreate();
 log.i(tag,"timeservice->oncreate");
 //初始化
 this.init();
 //定时器发送广播
 timer.schedule(new timertask() {
 @override
 public void run() {
  //发送广播
  sendtimechangedbroadcast();
 }
 }, 1000,1000);
}
@override
public ibinder onbind(intent intent) {
 log.i(tag,"timeservice->onbind");
 return null;
}
/**
 * 相关变量初始化
 */
private void init(){
 util=new sharedpreferencesutil(this);
 timer = new timer();
 timeintent = new intent();
}

/**
 * 发送广播，通知ui层时间已改变
 */
private void sendtimechangedbroadcast(){
 try {
 timeintent.putextra("time",gettime());
 timeintent.setaction(timeactivity.time_changed_action);
 //发送广播，通知ui层时间改变了
 sendbroadcast(timeintent);
 } catch (parseexception e) {
 e.printstacktrace();
 }
}
/**
 * 获取最新时间
 * @return
 */
private string gettime() throws parseexception {

 string time;
 time=getsubtract(util.readstring(mycontant.starttime));
 return time;
}

//时间相减 得到计时时间
public string getsubtract(string starttime) throws parseexception {

 simpledateformat myformatter = new simpledateformat( "hh:mm:ss");
 string newtime= stringutils.gettime();
 date date= myformatter.parse(newtime);
 date mydate= myformatter.parse(starttime);
 int sec= (int) ((date.gettime()-mydate.gettime())/1000);
 int min=sec/60;
 int hour=min/60;

 if (sec >= 60) {
 sec = (sec % 60);
 }

 if (min >= 60) {
 min = (min % 60);
 }
 string hstring;
 string mstring;
 string string;
 if (hour < 10) {
 hstring = "0" + string.valueof(hour);
 } else {
 hstring = string.valueof(hour);
 }
 if (min < 10) {
 mstring = "0" + string.valueof(min);
 } else {
 mstring = string.valueof(min);
 }
 if (sec < 10) {
 string = "0" + string.valueof(sec);
 } else {
 string = string.valueof(sec);
 }

 return hstring + ":" + mstring + ":" + string;
}

@override
public componentname startservice(intent service) {
 log.i(tag,"timeservice->startservice");
 return super.startservice(service);
}

@override
public void ondestroy() {
 super.ondestroy();
 log.i(tag,"timeservice->ondestroy");
}
}

4、broadcastreceiver广播接受者，更新ui界面的时间：uitimereceiver

public class uitimereceiver extends broadcastreceiver {
private timeactivity duiactivity = new timeactivity();
@override
public void onreceive(context context, intent intent) {
 string action = intent.getaction();
 if(timeactivity.time_changed_action.equals(action)){
 string strtime = intent.getstringextra("time");
 //此处实现不够优雅，为了在uitimereceiver中使用dynamicuiactivity中的textview组件time，而将其设置为public类型，
 //更好的实现是将uitimereceiver作为dynamicuiactivity的内部类
 duiactivity.tv_time.settext(strtime);
 }
}
}

5、记住要在配置文件里面配置哦！

 <service android:name=".service.timeservice"/>
 <receiver android:name=".service.uitimereceiver">
 <intent-filter>
  <action android:name="com.yy.time.time_changed_action"/>
 </intent-filter>
 </receiver>

好了，一个简单的计时就完成了，写的不好请见谅！

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。