Tuesday, May 21, 2013

Android : Service

Service


A Service is an application component representing either an application's desire to perform a longer-running operation while not interacting with the user or to supply functionality for other applications to use. Each service class must have a corresponding <service> declaration in its package's AndroidManifest.xml. Services can be started with Context.startService() and Context.bindService().
             Android offers the Service class to create application components specifically to handle operations and functionality that should run invisibly, without a user interface.

Unlike Activities, which present a rich graphical interface to users, Services run in the background —
updating your Content Providers, firing Intents, and triggering Notifications.


Service Class Overview


public class MyService extends Service {
   

    // Unique Identification Number for the Notification.
    // We use it on Notification start, and to cancel it.
    private int NOTIFICATION = R.string.local_service_started;

    /**
     * Class for clients to access.  Because we know this service always
     * runs in the same process as its clients, we don't need to deal with
     * IPC.
     */
    public class LocalBinder extends Binder {
        LocalService getService() {
            return LocalService.this;
        }
    }

    @Override
    public void onCreate() {
           
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("LocalService", "Received start id " + startId + ": " + intent);
        // We want this service to continue running until it is explicitly
        // stopped, so return sticky.
        return null;
    }

    @Override
    public void onDestroy() {
        
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }
 
 

Determining the cause of a system start


@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if ((flags & START_FLAG_RETRY) == 0) {
// TODO If it’s a restart, do something.
}
else {
// TODO Alternative background process.
}
return Service.START_STICKY;
}


Registering a Service in the Manifest


<service android:enabled="true" android:name=".MyService"/>


Starting Service


 // Create Intent 
Intent intent=new Intent(this,MyService.class);
// start the service 
startService(intent);
 
 

Self-Terminating a Service


   stopSelf(startId);


You can read see good example of Android Service in below post. 

Android Service Example : Vibrate Service


public class VibrateService  extends Service
{

   

    @Override
            public void onStart(Intent intent, int startId) {
                // TODO Auto-generated method stub
                super.onStart(intent, startId);
               
                       
                       
                                    Vibrator v = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
                                    //  To  Vibrate in a pattern
                                    long pattern[]={0,800,200,1200,300,2000,400,4000};
                                    v.vibrate(pattern, -1);
                             }

        @Override
        public IBinder onBind(Intent intent)
        {
            // TODO Auto-generated method stub
            return null;
        }
      
}

Thing to Ponder:


   long pattern[]={0,800,200,1200,300,2000,400,4000}

this is pattern in which we want to Vibrate the Phone
first 0  means silent for 0 milisecond
800 means vibrate for 800 milisecond
200 means  means silent for 200 milisecond
1200  means vibrate for 1200 miliseconds

and So On.

If we do not give the Pattern Phone will vibrate in Default Manner



 

Advance Android Topics


                   Customizing Toast In Android 
                   Showing Toast for Longer Time
                   Customizing the Display Time of Toast
                   Using TimePickerDialog and DatePickerDialog In android
                   Animating A Button In Android
                    Populating ListView With DataBase

                    Customizing Checkboxes In Android 
                    Increasin Size of Checkboxes
                    Android ProgressBar
                    Designing For Different Screen Sizes
                    Handling Keyboard Events

More Android Topics:



  

Android : Introduction


       Eclipse Setup for Android Development

                     Configuring Eclipse for Android Development

          Begging With Android

                     Creating Your First Android Project
                     Understanding Android Manifest File of your android app


         Working With Layouts

                      Understanding Layouts in Android
                          Working with Linear Layout (With Example)
                                Nested Linear Layout (With Example)
                          Table Layout
                          Frame Layout(With Example)
                         Absolute Layout
                         Grid Layout


       Activity

                     Activity In Android
                     Activity Life Cycle
                     Starting Activity For Result
                     Sending Data from One Activity to Other in Android
                     Returning Result from Activity

     Working With Views

                     Using Buttons and EditText in Android 
                     Using CheckBoxes in Android 
                     Using AutoCompleteTextView in Android
                     Grid View

       Toast

                     Customizing Toast In Android
                     Customizing the Display Time of Toast
                     Customizing Toast At Runtime
                     Adding Image in Toast
                     Showing Toast for Longer Time

     Dialogs In Android

                     Working With Alert Dialog
                     Adding Radio Buttons In Dialog
                     Adding Check Boxes In Dialog
                     Creating Customized Dialogs in Android
                    Adding EditText in Dialog

                   Creating Dialog To Collect User Input

                 DatePicker and TimePickerDialog

                              Using TimePickerDialog and DatePickerDialog In android

    Working With SMS

                  How to Send SMS in Android
                  How To Receive SMS
                  Accessing Inbox In Android

    ListView:

               Populating ListView With DataBase

      Menus In Android

                    Creating Option Menu
                    Creating Context Menu In Android

      TelephonyManager

                    Using Telephony Manager In Android

     Working With Incoming Calls

                    How To Handle Incoming Calls in Android
                    How to Forward an Incoming Call In Android
                   CALL States In Android
 

    Miscellaneous

                   Notifications In Android
                   How To Vibrate The Android Phone
                   Sending Email In Android
                  Opening a webpage In Browser
                   How to Access PhoneBook In Android
                   Prompt User Input with an AlertDialog

   Storage:  Storing Data In Android


               Shared Prefferences  In Android

                             SharedPreferences In Android

               Files: File Handling In Android

                              Reading and Writing files to Internal Stoarage
                              Reading and Writing files to SD Card 
                           

                DataBase : Working With Database

                             Working With Database in Android
                             Creating Table In Android
                             Inserting, Deleting and Updating Records In Table in Android
                             How to Create DataBase in Android
                             Accessing Inbox In Android

     Animation In Android:

                  Animating A Button In Android





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