CODEWITHSUNDEEP
androidandroid-intent
Joseph_Marzbani
Joseph_Marzbani

Reputation: 1876

Intent.getStringExtra() always returns null

I have a service in which I have:

Intent intent = new Intent(ClipboardWatcherService.this, DeliDict.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.putExtra("searchTerm", searchTerm);
startActivity(intent);

and in my activity:

    @Override
    public void onStart()
    {
            super.onStart();

            Intent intent = getIntent();
            String clipboardSearchTerm = intent.getStringExtra("searchTerm");
            ...
    }

But intent.getStringExtra() always returns null.

NOTE: Because I'm calling StartActivity() from my Service (that's outside an activity class) I have to define Intent.FLAG_ACTIVITY_NEW_TASK causing only ONE instance of my activity be alive at a time. So I have to go inside onStart() since onCreate() is called only once. Basically I've been looking for a reliable way to send data from my Service to the activity for a whole day but in vain. can you suggest something?

Upvotes: 3

Views: 4645

Answers (1)

Amit Gupta
Amit Gupta

Reputation: 8939

If you need to pass some value from Service to any Activity class, you should use BroadcastReceiver.

Step1) You need to register first that BroadcastReceiver to that Activity. For this you need to define Action for that.

public static final String YOUR_ACTION_STRING = "com.test.android.service.receiver";

Now Register the Receiver

registerReceiver(receiver, new IntentFilter("YOUR_ACTION_STRING"));

and receive the value here

private BroadcastReceiver receiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
      Bundle bundle = intent.getExtras();
      if (bundle != null) {
        String clipboardSearchTerm = intent.getString("searchTerm");

      }
    }
  };

Step 2) From Service you need to Broadcast the message.

   Intent intent=new Intent();
   intent.setAction("YOUR_ACTION_STRING");
   intent.putExtra("searchTerm", searchTerm);
   sendBroadcast(intent);//Broadcast your message to registered Activity

Upvotes: 2

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