GoogleAnalyticsSessionHelper.java

package com.androsz.electricsleepbeta.util;

import android.app.Application;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Build.VERSION;
import android.util.Log;

import com.google.android.apps.analytics.GoogleAnalyticsTracker;

/**
 * @author Jon
 *
 *         Singleton that helps keep GA sessions open only as long as they are
 *         needed
 */
public class GoogleAnalyticsSessionHelper {

    private static final String TAG = GoogleAnalyticsSessionHelper.class.getSimpleName();

    private static GoogleAnalyticsSessionHelper INSTANCE;

	private final String key;
	private final Application appContext;
	private int sessionCount;

	private GoogleAnalyticsSessionHelper(String key, Application appContext) {
		this.key = key;
		this.appContext = appContext;
		this.sessionCount = 0;
	}

	public static GoogleAnalyticsSessionHelper getInstance(String key, Application appContext) {
		// Create a new instance if it is not cached. Otherwise, use the
		// cached one.
		if (INSTANCE == null) {
			INSTANCE = new GoogleAnalyticsSessionHelper(key, appContext);
		}
		return INSTANCE;
	}

	public static GoogleAnalyticsSessionHelper getExistingInstance() {
		return INSTANCE;
	}

	public void onStartSession() {
		if (sessionCount == 0) {
			GoogleAnalyticsTracker.getInstance().startNewSession(key, appContext);
		}

		String versionName = "?";
		try {
			versionName = appContext.getPackageManager().getPackageInfo(appContext.getPackageName(), 0).versionName;
		} catch (final NameNotFoundException e) {
			e.printStackTrace();
		}

		GoogleAnalyticsTracker.getInstance().setProductVersion(appContext.getPackageName(), versionName);

		// I have no idea...
		GoogleAnalyticsTracker.getInstance().setCustomVar(1, Integer.toString(VERSION.SDK_INT),
				Build.MODEL);
		GoogleAnalyticsTracker.getInstance().setCustomVar(2, versionName,
				Build.MODEL + "-" + Integer.toString(VERSION.SDK_INT));

		sessionCount++;
	}

	public void onStopSession() {
		sessionCount--;
		if(sessionCount < 1)
		{
			sessionCount = 0;
			//don't dispatch data to network until we stop
			GoogleAnalyticsTracker.getInstance().dispatch();
			GoogleAnalyticsTracker.getInstance().stopSession();
		}
	}

	public static void trackEvent(final String label, final int value) {
		new AsyncTask<Void, Void, Void>() {
			@Override
			protected Void doInBackground(Void... params) {
				try {
					GoogleAnalyticsTracker.getInstance().trackEvent(
							Integer.toString(VERSION.SDK_INT), Build.MODEL, label, value);
				} catch (final Exception ex) {
                    Log.d(TAG, "Exception when attempting to track event.", ex);
                }
				return null;
			}
		}.execute();
	}

	public static void trackPageView(final String pageUrl) {
		new AsyncTask<Void, Void, Void>() {
			@Override
			protected Void doInBackground(Void... params) {
				try {
					GoogleAnalyticsTracker.getInstance().trackPageView(pageUrl);
				} catch (final Exception ex) {
                    Log.d(TAG, "Exception while attempting to track page view.", ex);
                }
				return null;
			}
		}.execute();
	}
}