startActivityForResult and Intents Extras, it seems extras are not pushed back

I have this code:

Intent intent = new Intent();
        intent.setAction(Intent.ACTION_PICK);
        intent.setData(ContactsContract.Contacts.CONTENT_URI);
        intent.putExtra(EXTRA_ONLINE_ID, (String) v.getTag());
        startActivityForResult(intent, PICK_CONTACT);

Then on response:

public void onActivityResult(int reqCode, int resultCode, Intent data) {


        switch (reqCode) {
            case (PICK_CONTACT):
                if (resultCode == Activity.RESULT_OK) {
                    try {
                        Uri contactData = data.getData();
                        String onlineid = data.getStrin开发者_如何学编程gExtra(EXTRA_ONLINE_ID);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                break;
        }
        super.onActivityResult(reqCode, resultCode, data);
    }

the onlineid variable is null. How can I pass a value and then to receive it back?

EDIT

I even tried,

Bundle extras = data.getExtras(); // returns null

This is done by design; system activities will not send back the extras with which they're called, so you have to manage the data elsewhere.

Luckily, the resultCode parameter is fully controlled by yourself, which means that you can use it to index your data.

private final int PICK_CONTACT = 0;
private Bundle[] myDataTransfer = { null };

...

Bundle myData = new Bundle();
myData.putString(EXTRA_ONLINE_ID, (String) v.getTag());
myDataTransfer[PICK_CONTACT] = myData;
// create intent and all
startActivityForResult(intent, PICK_CONTACT);

...

public void onActivityResult(int reqCode, int resultCode, Intent data) {
    if (resultCode == PICK_CONTACT) {
        Bundle myData = myDataTransfer[resultCode];
        String onlineid = myData.getString(EXTRA_ONLINE_ID);
    }
}

I'm not a Java programmer, there must be a nicer way to implement a map of Bundles, but this works :)

ok Check if your Activity android:launchMode is configured as SingleTask or SingleInstance! that must be the problem :)

The EXTRA_ONLINE_ID field will have to be set in the activity that you launched using setResult. If it's not setting that value in the returned Intent (which is different from what you sent) then you will get a null value.

I was running into some problems with this as well.

Instead of this line

 intent.putExtra(EXTRA_ONLINE_ID, (String) v.getTag());

Try

 intent.putExtra(EXTRA_ONLINE_ID, "" + v.getTag());