Google Analytics Util

public class GA {

	private static volatile GA sInstance;

	public static GA from(Context context) {
		if (sInstance == null) {
			synchronized (GA.class) {
				if (sInstance == null) {
					sInstance = new GA(context);
				}
			}
		}
		return sInstance;
	}

	private final Context context;

	private GA(Context context) {
		this.context = context.getApplicationContext();
	}

	public void screen(@StringRes int screenId) {
		if (!App.GA_ENABLED) {
			return;
		}
		if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(context) != ConnectionResult.SUCCESS) {
			return;
		}
		Tracker tracker = getTracker();
		tracker.setScreenName(context.getString(screenId));
		tracker.send(new HitBuilders.ScreenViewBuilder().build());
	}

	public void event(@StringRes int eventCategoryId, @StringRes int eventActionId) {
		event(eventCategoryId, context.getString(eventActionId));
	}

	@SuppressWarnings("PointlessBooleanExpression")
	public void event(@StringRes int eventCategoryId, String eventAction) {
		if (!App.GA_ENABLED) {
			return;
		}
		if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(context) != ConnectionResult.SUCCESS) {
			return;
		}
		getTracker().send(new HitBuilders.EventBuilder()
				.setCategory(context.getString(eventCategoryId))
				.setAction(eventAction)
				.build());
	}

	@SuppressWarnings("PointlessBooleanExpression")
	public void event(@StringRes int eventCategoryId, @StringRes int eventActionId, String label) {
		if (!App.GA_ENABLED) {
			return;
		}
		if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(context) != ConnectionResult.SUCCESS) {
			return;
		}
		getTracker().send(new HitBuilders.EventBuilder()
				.setCategory(context.getString(eventCategoryId))
				.setAction(context.getString(eventActionId))
				.setLabel(label)
				.build());
	}

	private Tracker getTracker() {
		Tracker tracker = GoogleAnalytics.getInstance(context).newTracker(R.xml.global_tracker);
		tracker.enableAdvertisingIdCollection(true);
		return tracker;
	}

	public void event(@StringRes int eventCategoryId, @StringRes int eventActionId, int labelId) {
		event(eventCategoryId, eventActionId, context.getString(labelId));
	}
}