如何在android应用中利用service实现一个计时器功能
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1、首先建立主页面的设计：activity_time.xml
<?xml version="1.0" encoding="utf-8"?>
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！
以上就是如何在android应用中利用service实现一个计时器功能，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。
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