Android Four Components Learning Service II

The previous section learned how to create a service and start a service with activity. This section is based on a better

This section learns to start the service with StartServer and prints the current time every second in the service

To illustrate:

MyActivity Code:

public class MyActivity extends Activity {private button btn_start;private button btn_end; @Overrideprotected void Oncreat E (Bundle savedinstancestate) {//TODO auto-generated method Stubsuper.oncreate (savedinstancestate); Setcontentview ( R.layout.activity_myservice); Btn_start = (Button) Findviewbyid (r.id.button1);                Btn_end = (Button) Findviewbyid (R.id.button2);               Btn_start.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View arg0) {//Start service Intent Intent = new Intent (myactivity.this, Myservice.class); StartService (Intent);}}); Btn_end.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View arg0) {//Destroy service Intent intent = new Int ENT (Myactivity.this, Myservice.class); StopService (intent);}});}}

MyService's Code:

public class MyService extends Service {@Override//methods that must be implemented public IBinder Onbind (Intent arg0) {//TODO auto-generated Metho D stublog.i ("MyService", "Onbind------------"); return null;} @Override//was created when the call to public void OnCreate () {//TODO auto-generated method Stubsuper.oncreate (); LOG.I ("MyService", "OnCreate------------");} @Override @deprecated//onstart method is now replaced by ONSTARTCOMMD, in fact Onstartcommand also called Onstartpublic void OnStart (Intent Intent, int Startid) {//TODO auto-generated Method Stubsuper.onstart (Intent, Startid); LOG.I ("MyService", "OnStart------------");} @Override//Start call public int Onstartcommand (Intent Intent, int flags, int startid) {//TODO auto-generated method stublog.i ("MyService", "Onstartcommand------------"); for (int i=0; i<100; i++) {simpledateformat format = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); String time = Format.format (new Date ()); LOG.I ("MyService", time), try {thread.sleep (+),} catch (Interruptedexception e) {//TODO auto-generated catch Blocke.printstacktrace ();}} REturn Super.onstartcommand (Intent, flags, Startid);} @Overridepublic void OnDestroy () {//TODO auto-generated method Stubsuper.ondestroy (); LOG.I ("MyService", "OnDestroy------------");} @Overridepublic boolean onunbind (Intent Intent) {//TODO auto-generated method stublog.i ("MyService", " Onunbind------------"); return Super.onunbind (Intent);}}

Operating effect:

Although the service started, but our interface is the service of the print task card dead. So for this time-consuming task, we have to put it in a thread to prevent the card-dead GUI from displaying

So I made a change to the MyService code:

public class MyService extends Service {    private MyThread thread;    private boolean sto PFlag = false;         @Override//methods that must be implemented     public IBinder onbind (Intent arg0) {        //TODO auto-generated method stub         LOG.I ("MyService", "Onbind------------");        return null;    }          @Override//call to be created     public void OnCreate () {        //TODO auto-generated method stub        super.oncreate ();         //When the service is created, instantiate mythread        thread = new MyThread ( );        log.i ("MyService", "OnCreate------------");    }          @Override      @Deprecated//onstart PartyThe law is now replaced by ONSTARTCOMMD, in fact in Onstartcommand also called the onstart    public void OnStart (Intent Intent, int startid) {         //TODO auto-generated method stub         Super.onstart (Intent, Startid);        log.i ("MyService", "OnStart------------");     }             @Override//start-up will be called      public int Onstartcommand (Intent Intent, int flags, int startid) {        //TODO Auto-gener Ated method stub        log.i ("MyService", "Onstartcommand------------");       after the  //service runs, start thread         if (!stopflag)          {            thread.start ();             thread.setflag (true);       &Nbsp;    }        return super.onstartcommand (Intent, flags, Startid);     }         @Override     public void OnDestroy () {         //TODO auto-generated method stub         Super.ondestroy ();        //Service when destroying, stop thread tasks          Thread.setflag (False);        log.i ("MyService", "OnDestroy------------");     }         @Override     public boolean onunbind (Intent Intent ) {        //TODO auto-generated method stub        log.i ( "MyService", "Onunbind------------");        return super.onunbind (Intent);     }        class MyThread extends thread    {                //settings flag         public void Setflag (Boolean flag)         {       & nbsp;    stopflag = flag;        }         @Override         public void Run () {           & Nbsp;super.run ();            while (stopflag)              {                // Set the time output mode                 simpledateformat format = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");                String  time = Format.format (new Date ());       &NBsp;                        //display time                 log.i ("MyService";                                  try {                    //Delay One second                      thread.sleep (;  )              } catch ( Interruptedexception e) {                    //TODO auto-generated catch block                & nbsp;   e.printstacktrace ();                }            }        }    }}

The results are as follows:

When I click on the button that starts the service

You can see that when you click the Start Service button, create first, then Onstartcommand (Onstart)

When I then press Start service:

You can see that when the service starts again and starts the service again, it will only call the Onstartcommand function's

Then destroy the service:

You can see that the service is destroyed and our thread tasks are stopped.

Ok. This is where you start the service today with StartServer.

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Android Four Components Learning Service II