Pass data from Activity to Service using an Intent

Question

How do I get data within an Android Service that was passed from an invoking Activity

User · Answer

Service  startservice can cause side affects best way to use messenger and pass data    private CallBackHandler mServiceHandler  new CallBackHandler this   private Messenger mServiceMessenger null    flag with which the activity sends the data to service private static final int DO SOMETHING 1   private static class CallBackHandler extends android os Handler    private final WeakReference lt Service gt  mService   public CallBackHandler Service service        mService  new WeakReference lt Service gt  service      public void handleMessage Message msg          Log d  CallBackHandler   Msg    msg       if DO SOMETHING  msg arg1      mSoftKeyService get   dosomthing         Activity Get Messenger from Intent fill it pass data and pass the message back to service  private Messenger mServiceMessenger   Override protected void onCreate Bundle savedInstanceState    mServiceMessenger    Messenger extras getParcelable  myHandler        private void sendDatatoService String data   Intent serviceIntent  new  Intent BaseActivity this Service class   Message msg   Message obtain    msg obj  data  msg arg1 Service DO SOMETHING  mServiceMessenger send msg

User · Answer

If you are using kotlin you can try the following code  In the sending activity    val intent   Intent context  RecorderService  class java     intent putExtra  quot filename quot   filename     context startService intent   In the service  override fun onStartCommand intent  Intent  flags  Int  startId  Int   Int       super onStartCommand intent  flags  startId       if  intent    null  amp  amp  intent extras    null         val filename   intent getStringExtra  quot filename quot

User · Answer

If you bind your service  you will get the Extra in onBind Intent intent    Activity    Intent intent   new Intent this  LocationService class                                                                                         intent putExtra  tour name   mTourName                        bindService intent  mServiceConnection  BIND AUTO CREATE      Service     Override public IBinder onBind Intent intent        mTourName   intent getStringExtra  tour name        return mBinder

User · Answer

Pass data from Activity to IntentService This is how I pass data from Activity to IntentService  One of my application has this scenario  MusicActivity ------url String ------ gt  DownloadSongService 1  Send Data  Activity code    Intent intent    new Intent MusicActivity class  DownloadSongService class     String songUrl    quot something quot      intent putExtra YOUR KEY SONG NAME  songUrl     startService intent    2  Get data in Service  IntentService code  You can access the intent in the onHandleIntent   method public class DownloadSongService extends IntentService         Override     protected void onHandleIntent  Nullable Intent intent             String songUrl   intent getStringExtra  quot YOUR KEY SONG NAME quot                 Download File logic

User · Answer

For a precise answer to this question on  How to send data via intent from an Activity to Service   Is that you have to override the onStartCommand   method which is where you receive the intent object   When you create a Service you should override the onStartCommand   method so if you closely look at the signature below  this is where you receive the intent object which is passed to it     public int onStartCommand Intent intent  int flags  int startId    So from an activity you will create the intent object to start service and then you place your data inside the intent object for example you want to pass a UserID from Activity to Service    Intent serviceIntent   new Intent YourService class getName     serviceIntent putExtra  UserID    123456     context startService serviceIntent     When the service is started its onStartCommand   method will be called so in this method you can retrieve the value  UserID  from the intent object for example  public int onStartCommand  Intent intent  int flags  int startId        String userID   intent getStringExtra  UserID        return START STICKY      Note  the above answer specifies to get an Intent with getIntent   method which is not correct in context of a service

User · Answer

This is a much better and secured way  Working like a charm      private void startFloatingWidgetService             startService new Intent MainActivity this FloatingWidgetService class                   setAction FloatingWidgetService ACTION PLAY            instead of     private void startFloatingWidgetService             startService new Intent FloatingWidgetService ACTION PLAY            Because when you try 2nd one then you get an error saying   java lang IllegalArgumentException  Service Intent must be explicit  Intent   act com floatingwidgetchathead demo SampleService ACTION START    Then your Service be like this    static final String ACTION START    com floatingwidgetchathead demo SampleService ACTION START       static final String ACTION PLAY    com floatingwidgetchathead demo SampleService ACTION PLAY       static final String ACTION PAUSE    com floatingwidgetchathead demo SampleService ACTION PAUSE       static final String ACTION DESTROY    com yourcompany yourapp SampleService ACTION DESTROY      SuppressLint  LogConditional    Override public int onStartCommand Intent intent  int flags  int startId        String action   intent getAction          System out println  ACTION    action       switch  action           case ACTION START              Log d TAG   onStartCommand    action               break          case ACTION PLAY              Log d TAG   onStartCommand    action              addRemoveView               addFloatingWidgetView                break          case ACTION PAUSE              Log d TAG   onStartCommand    action               break          case ACTION DESTROY              Log d TAG   onStartCommand    action               break            return START STICKY

User · Answer

Another posibility is using intent getAction   In Service   public class SampleService inherits Service      static final String ACTION START    com yourcompany yourapp SampleService ACTION START       static final String ACTION DO SOMETHING 1    com yourcompany yourapp SampleService DO SOMETHING 1       static final String ACTION DO SOMETHING 2    com yourcompany yourapp SampleService DO SOMETHING 2       static final String ACTION STOP SERVICE    com yourcompany yourapp SampleService STOP SERVICE         Override     public int onStartCommand Intent intent  int flags  int startId            String action   intent getAction              System out println  ACTION    action           switch  action               case ACTION START                  startingService intent getIntExtra  valueStart  0                    break              case ACTION DO SOMETHING 1                  int value1 value2                  value1 intent getIntExtra  value1  0                   value2 intent getIntExtra  value2  0                   doSomething1 value1 value2                   break              case ACTION DO SOMETHING 2                  value1 intent getIntExtra  value1  0                   value2 intent getIntExtra  value2  0                   doSomething2 value1 value2                   break              case ACTION STOP SERVICE                  stopService                    break                    return START STICKY             public void startingService int value             calling when start            public void doSomething1 int value1  int value2                            public void doSomething2 int value1  int value2                            public void stopService                 destroy release objects         stopself              In Activity   public void startService int value       Intent myIntent   new Intent SampleService ACTION START       myIntent putExtra  valueStart  value       startService myIntent      public void serviceDoSomething1 int value1  int value2       Intent myIntent   new Intent SampleService ACTION DO SOMETHING 1       myIntent putExtra  value1  value1       myIntent putExtra  value2  value2       startService myIntent      public void serviceDoSomething2 int value1  int value2       Intent myIntent   new Intent SampleService ACTION DO SOMETHING 2       myIntent putExtra  value1  value1       myIntent putExtra  value2  value2       startService myIntent      public void endService        Intent myIntent   new Intent SampleService STOP SERVICE       startService myIntent       Finally  In Manifest file    lt service android name   SampleService  gt       lt intent-filter gt           lt action android name  com yourcompany yourapp SampleService ACTION START   gt           lt action android name  com yourcompany yourapp SampleService DO SOMETHING 1   gt           lt action android name  com yourcompany yourapp SampleService DO SOMETHING 2   gt           lt action android name  com yourcompany yourapp SampleService STOP SERVICE   gt       lt  intent-filter gt   lt  service gt

User · Answer

First Context  can be Activity Service etc   For Service  you need to override onStartCommand there you have direct access to intent    Override public int onStartCommand Intent intent  int flags  int startId      You have a few options   1  Use the Bundle from the Intent   Intent mIntent   new Intent this  Example class   Bundle extras   mIntent getExtras    extras putString key  value       2  Create a new Bundle  Intent mIntent   new Intent this  Example class   Bundle mBundle   new Bundle    mBundle extras putString key  value   mIntent putExtras mBundle     3  Use the putExtra   shortcut method of the Intent  Intent mIntent   new Intent this  Example class   mIntent putExtra key  value     New Context  can be Activity Service etc   Intent myIntent   getIntent       this getter is just for example purpose  can differ if  myIntent   null  amp  amp  myIntent getExtras    null       String value   myIntent getExtras   getString key       NOTE  Bundles have  get  and  put  methods for all the primitive types  Parcelables  and Serializables  I just used Strings for demonstrational purposes

User · Answer

Activity   int number   5  Intent i   new Intent this  MyService class   i putExtra  MyNumber   number   startService i     Service    Override public int onStartCommand Intent intent  int flags  int startId        if  intent    null  amp  amp  intent getExtras      null           int number   intent getIntExtra  MyNumber   0

[android] Pass data from Activity to Service using an Intent

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