EventTracker.java

package com.bootstrap.analytics;

import com.google.android.gms.analytics.HitBuilders;
import com.google.android.gms.analytics.Tracker;
import com.google.android.gms.analytics.ecommerce.Product;
import com.google.android.gms.analytics.ecommerce.ProductAction;

import java.util.Arrays;

public final class EventTracker {
  private final Tracker tracker;
  private final HitBuilders.EventBuilder builder;

  private String screenName;
  private Dimension[] dimensions;

  private EventTracker(final Tracker tracker) {
    this.tracker = tracker;
    this.builder = new HitBuilders.EventBuilder();
  }

  public EventTracker screenName(final String screenName) {
    this.screenName = screenName;
    return this;
  }

  public EventTracker category(final String category) {
    builder.setCategory(category);
    return this;
  }

  public EventTracker action(final String action) {
    builder.setAction(action);
    return this;
  }

  public EventTracker label(final String label) {
    if (label != null) {
      builder.setLabel(label);
    }
    return this;
  }

  public EventTracker value(final long value) {
    builder.setValue(value);
    return this;
  }

  public EventTracker addProduct(final Product product) {
    builder.addProduct(product);
    return this;
  }

  public EventTracker productAction(final ProductAction productAction) {
    builder.setProductAction(productAction);
    return this;
  }

  public EventTracker customDimension(final Dimension dimension) {
    if (dimensions == null) {
      dimensions = new Dimension[1];
      dimensions[0] = dimension;
    } else {
      dimensions = Arrays.copyOf(dimensions, dimensions.length + 1);
      dimensions[dimensions.length - 1] = dimension;
    }
    return this;
  }

  public void track() {
    if (dimensions != null && dimensions.length > 0) {
      for (Dimension dimension : dimensions) {
        builder.setCustomDimension(dimension.index, dimension.value);
      }
    }
    tracker.setScreenName(screenName);
    tracker.send(builder.build());
    tracker.setScreenName(null);
  }

  protected static EventTracker from(final Tracker tracker) {
    return new EventTracker(tracker);
  }
}