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本篇文章給大家分享的是有關如何在android應用中利用service實現一個計時器功能，小編覺得挺實用的，因此分享給大家學習，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。
1、首先建立主頁面的設計：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();
//定時器發送廣播
timer.schedule(new TimerTask() {
@Override
public void run() {
//發送廣播
sendTimeChangedBroadcast();
}
}, 1000,1000);
}
@Override
public IBinder onBind(Intent intent) {
Log.i(TAG,"TimeService->onBind");
return null;
}
/**
* 相關變量初始化
*/
private void init(){
util=new SharedPreferencesUtil(this);
timer = new Timer();
timeIntent = new Intent();
}
/**
* 發送廣播，通知UI層時間已改變
*/
private void sendTimeChangedBroadcast(){
try {
timeIntent.putExtra("time",getTime());
timeIntent.setAction(TimeActivity.TIME_CHANGED_ACTION);
//發送廣播，通知UI層時間改變了
sendBroadcast(timeIntent);
} catch (ParseException e) {
e.printStackTrace();
}
}
/**
* 獲取最新時間
* @return
*/
private String getTime() throws ParseException {
String time;
time=getsubtract(util.readString(MyContant.STARTTIME));
return time;
}
//時間相減 得到計時時間
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廣播接受者，更新UI界面的時間：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");
//此處實現不夠優雅，為了在UITimeReceiver中使用DynamicUIActivity中的TextView組件time，而將其設置為public類型，
//更好的實現是將UITimeReceiver作為DynamicUIActivity的內部類
dUIActivity.tv_time.setText(strtime);
}
}
}5、記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>
以上就是如何在android應用中利用service實現一個計時器功能，小編相信有部分知識點可能是我們日常工作會見到或用到的。希望你能通過這篇文章學到更多知識。更多詳情敬請關注億速云行業資訊頻道。
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