Unable to retrieve intent's extras

Question

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.

Answer 1

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);    
}

Answer 2

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.

Answer 3

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);