CODEWITHSUNDEEP
android
parser_failed
parser_failed

Reputation: 697

Unable to retrieve intent's extras

I have an activity that I use in multiples modes, so I have to do things like this:

    Intent i = new Intent(MainListActivity.this,MainActivity.class);
    extras.putInt("id", c.getId());
    extras.putInt("mode", AREA_MODE);
    i.putExtra("extras", extras);
    startActivity(i);

and in the onCreate:

    Intent i = this.getIntent();
    extras = i.getBundleExtra("extras");
    if(extras!=null){
        id = extras.getInt("id", -1);
        mode = extras.getInt("mode", COUNTRY_MODE);
    }

But the intent extras are always null. Am I missing something? Is there any way to do this?

EDIT: For some reason, the getIntent() method returns the previous Intent which in my case has no extra (main intent). I'm trying to figure out why.

Upvotes: 5

Views: 6131

Answers (6)

Jerry101
Jerry101

Reputation: 13467

Aha! I just debugged this problem. It turns out to be due to a subtle detail documented in PendingIntent.

  • A PendingIntent is a reference to a system-maintained token. So even if the sending process restarts, reconstructing a similar intent will retrieve the original PendingIntent. Then the sender can cancel or change it.
  • Similar intent == same operation, action, data, categories, components, and flags. Extras don't count!
  • Intents that differ only in their Extras all retrieve the same token.

A common mistake people make is to create multiple PendingIntent objects with Intents that only vary in their "extra" contents, expecting to get a different PendingIntent each time. This does not happen.

Fix 1: Make a distinct PendingIntent. It must have different operation, action, data, categories, components, or flags -- or request code integers.

Fix 2: Use FLAG_CANCEL_CURRENT or FLAG_UPDATE_CURRENT to cancel or modify any existing PendingIntent.

Those two fixes produce slightly different results. Either way, your new Extras should get through.

Upvotes: 4

chiranjib
chiranjib

Reputation: 5308

Kindly refer to the following link:

Upvotes: 0

parser_failed
parser_failed

Reputation: 697

I didn't find the cause of this issue so i gave up on using one activity. I have create others activities extending the problematic one and it started working (with both approach). Thank you all for your help.

Upvotes: 0

Robby Pond
Robby Pond

Reputation: 73494

It should be this.

Intent i = new Intent(MainListActivity.this ,MainActivity.class);
i.putExtra("id", c.getId());
i.putExtra("mode", AREA_MODE);
startActivity(i);

and

Intent i = this.getIntent();
id = i.getIntExtra("id", -1);
mode = i.getIntExtra("mode", COUNTRY_MODE);

Upvotes: 2

Bert F
Bert F

Reputation: 87603

You do not add extras to an intent this way:

 i.putExtra("extras", extras);

This puts an extra called "extras" into the intent. Your "extras" are in a non-standard place in the intent. If your onCreate() code were to retrieve the object mapped to "extras" and look in it, you would find your "extras".

The standard way is to populate a bundle and add it to the intent via putExtras:

i.putExtras(bundle);

or use the convenience methods like putExtra:

i.putExtra("mode", AREA_MODE);

Upvotes: 0

Vikas Patidar
Vikas Patidar

Reputation: 43359

Try like this:

In one Activity:

Intent i = new Intent();
Bundle bundle = new Bundle();
bundle.putInt("id", c.getId());
bundle.putInt("mode", AREA_MODE);    
i.putExtras(bundle);

In Another Activity:

Bundle extras = getIntent().getExtras();
if (extras != null) {
    id = extras.getInt("id", -1);
    mode = extras.getInt("mode", COUNTRY_MODE);    
}

Upvotes: 3

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