Updating adapter from BroadcastReceiver

Question

I'm in need of some help with an app I am writing.

I have a simple synchronization that should get the data from the server and update/insert it in the database.

Synchronization is done through BroadcastReceiver that is set with AlarmManager to run once a day. This works fine, I can get the data and update/insert it in the database when the app is running/not running, doesn't matter.

The problem I have is when the app is open - the adapter I use for displaying my Fragments cannot be updated (or I don't have an idea how). I need to update the adapter so I can refresh the Fragments in the FragmentActivity.

Any help is welcome, I lost quite a few hours so far and can't figure it out. Thanks!

Answer 1

I fixed the issue I was having with this - a BroadcastReceiver and a Timer like so:

Calendar c = Calendar.getInstance(TimeZone.getDefault());
Intent i = new Intent(this, CardBroadcastReceiver.class);
PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);
AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis() + 4000, 20000, pi);

Timer timer = new Timer();

timer.scheduleAtFixedRate(new TimerTask() {
    public void run() {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                 if(isRunning)
                 {
                     Log.i("ZEUS_REFRESHING_DATA", "NOW");
                     loadCards();
                 }
            }
        });
    }
}, 0, 10000);

Where the loadCards() method does the following:

public void loadCards()
{
    MyDbHandler db = new MyDbHandler(this);

    cards = db.getAllCards();
    this.cardCount = db.getCountCards();

    // Create the adapter that will return a fragment for each of the three
    // primary sections of the app.
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager(), this);
    if(this.cardCount > 0)
    {
        mSectionsPagerAdapter.setCount(this.cardCount);
        mSectionsPagerAdapter.notifyDataSetChanged();

    }
    // Set up the ViewPager with the sections adapter.
    mViewPager.setAdapter(mSectionsPagerAdapter);
}

So basically just reloads the adapter.

So now I can reload the cards while the app is in the background or not running with the BroadcastReceiver and when the app is active or in foreground I just use the timer to reload the data!

And that's it!