Android™ Application Development - Bahar Ali Khan

Chapter 8: Working in the Background
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6. The EarthquakeService will now update the earthquake provider each time it is asked to
refresh, as well as on an automated schedule (if one is specifi ed). This information is not yet
passed back to the Earthquake Activity’s ListView or the EathquakeMap Activity.
To alert those components, and any other applications interested in earthquake data, modify the
EarthquakeService to broadcast a new Intent whenever a new earthquake is added.
6.1. Modify the addNewQuake method to call a new announceNewQuake method.
public static final String NEW_EARTHQUAKE_FOUND = “New_Earthquake_Found”;
private void addNewQuake(Quake _quake) {
ContentResolver cr = getContentResolver();
// Construct a where clause to make sure we don’t already have this
// earthquake in the provider.
String w = EarthquakeProvider.KEY_DATE +
“ = “ + _quake.getDate().getTime();
}
// If the earthquake is new, insert it into the provider.
Cursor c = cr.query(EarthquakeProvider.CONTENT_URI, null, w, null, null);
if (c.getCount()==0){
ContentValues values = new ContentValues();
values.put(EarthquakeProvider.KEY_DATE, _quake.getDate().getTime());
values.put(EarthquakeProvider.KEY_DETAILS, _quake.getDetails());
double lat = _quake.getLocation().getLatitude();
double lng = _quake.getLocation().getLongitude();
values.put(EarthquakeProvider.KEY_LOCATION_LAT, lat);
values.put(EarthquakeProvider.KEY_LOCATION_LNG, lng);
values.put(EarthquakeProvider.KEY_LINK, _quake.getLink());
values.put(EarthquakeProvider.KEY_MAGNITUDE, _quake.getMagnitude());
cr.insert(EarthquakeProvider.CONTENT_URI, values);
announceNewQuake(_quake);
}
c.close();
private void announceNewQuake(Quake quake) {
}
6.2. Within announceNewQuake, broadcast a new Intent whenever a new earthquake
is found.
private void announceNewQuake(Quake quake) {
Intent intent = new Intent(NEW_EARTHQUAKE_FOUND);
intent.putExtra(“date”, quake.getDate().getTime());
intent.putExtra(“details”, quake.getDetails());
intent.putExtra(“longitude”, quake.getLocation().getLongitude());
intent.putExtra(“latitude”, quake.getLocation().getLatitude());
intent.putExtra(“magnitude”, quake.getMagnitude());
sendBroadcast(intent);
}