android平台的计时功能,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

1、首先建立主页面的设计：activity_time.xml

android:id="@+id/self_driving_wait_ll"

android:layout_width="match_parent"

android:layout_height="match_parent">

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical">

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" />

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！

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脚本之家。