bind unbind service example android

Question

can you give me a simple example of an application with background service which uses bind unbind methods to start and stop it  I was googling for it for a half-hour  but those examples use startService stopService methods or are very difficult for me  thank you

User · Answer

First of all  two things that we need to understand   Client   It makes request to a specific server   bindService new Intent  com android vending billing InAppBillingService BIND                mServiceConn  Context BIND AUTO CREATE    here mServiceConn is instance of ServiceConnection class inbuilt  it is actually interface  that we need to implement with two  1st for network connected and 2nd network not connected  method to monitor network connection state   Server   It handles the request of the client and makes replica of its own which is private to client only who send request and this raplica of server runs on different thread    Now at client side  how to access all the methods of server    Server sends response with IBinder Object  So  IBinder object is our handler which accesses all the methods of Service by using     operator           MyService myService  public ServiceConnection myConnection   new ServiceConnection         public void onServiceConnected ComponentName className  IBinder binder            Log d  ServiceConnection   connected            myService   binder              binder comes from server to communicate with method s of       public void onServiceDisconnected ComponentName className            Log d  ServiceConnection   disconnected            myService   null            Now how to call method which lies in service  myservice serviceMethod      Here myService is object and serviceMethod is method in service  and by this way communication is established between client and server

User · Answer

You can try using this code   protected ServiceConnection mServerConn   new ServiceConnection          Override     public void onServiceConnected ComponentName name  IBinder binder            Log d LOG TAG   onServiceConnected                Override     public void onServiceDisconnected ComponentName name            Log d LOG TAG   onServiceDisconnected             public void start            mContext is defined upper in code  I think it is not necessary to explain what is it      mContext bindService intent  mServerConn  Context BIND AUTO CREATE       mContext startService intent      public void stop         mContext stopService new Intent mContext  ServiceRemote class        mContext unbindService mServerConn

User · Answer

Add these methods to your Activity       private MyService myServiceBinder  public ServiceConnection myConnection   new ServiceConnection          public void onServiceConnected ComponentName className  IBinder binder            myServiceBinder     MyService MyBinder  binder  getService            Log d  ServiceConnection   connected            showServiceData               public void onServiceDisconnected ComponentName className            Log d  ServiceConnection   disconnected            myService   null            public Handler myHandler   new Handler         public void handleMessage Message message            Bundle data   message getData              public void doBindService         Intent intent   null      intent   new Intent this  BTService class          Create a new Messenger for the communication back        From the Service to the Activity     Messenger messenger   new Messenger myHandler       intent putExtra  MESSENGER   messenger        bindService intent  myConnection  Context BIND AUTO CREATE       And you can bind to service by ovverriding onResume    and onPause   at your Activity class    Override protected void onResume          Log d  activity    onResume        if  myService    null            doBindService              super onResume        Override protected void onPause           FIXME put back      Log d  activity    onPause        if  myService    null            unbindService myConnection           myService   null            super onPause        Note  that when binding to a service only the onCreate   method is called in the service class  In your Service class you need to define the myBinder method   private final IBinder mBinder   new MyBinder    private Messenger outMessenger    Override public IBinder onBind Intent arg0        Bundle extras   arg0 getExtras        Log d  service   onBind           Get messager from the Activity     if  extras    null            Log d  service   onBind with extra            outMessenger    Messenger  extras get  MESSENGER              return mBinder     public class MyBinder extends Binder       MyService getService             return MyService this            After you defined these methods you can reach the methods of your service at your Activity   private void showServiceData           myServiceBinder myMethod        and finally you can start your service when some event occurs like   BOOT COMPLETED   public class MyReciever  extends BroadcastReceiver       public void onReceive Context context  Intent intent            String action   intent getAction            if  action equals  android intent action BOOT COMPLETED                  Intent service   new Intent context  myService class               context startService service                       note that when starting a service the onCreate   and onStartCommand   is called in service class and you can stop your service when another event occurs by stopService   note that your event listener should be registerd in your Android manifest file    lt receiver android name  MyReciever  android enabled  true  android exported  true  gt           lt intent-filter gt               lt action android name  android intent action BOOT COMPLETED    gt           lt  intent-filter gt   lt  receiver gt

[android] bind/unbind service example (android)

Client

Server

Now at client side, how to access all the methods of server?

Now how to call method which lies in service

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