AnalyticsEventBuilder(Firebase)

AnalyticsEventBuilder.java

package com.example.taku;

import android.os.Bundle;

import com.google.firebase.analytics.FirebaseAnalytics;

import javax.inject.Inject;

/**
 * Builder of analytics event.
 */
public class AnalyticsEventBuilder {

    FirebaseAnalytics firebaseAnalytics;
    private Event event;
    private Bundle bundle;

    @Inject
    public AnalyticsEventBuilder(FirebaseAnalytics firebaseAnalytics) {
        this.firebaseAnalytics = firebaseAnalytics;
        bundle = new Bundle();
    }

    /**
     * Set event.
     *
     * @param event {@link Event}
     * @return {@link AnalyticsEventBuilder}
     */
    public AnalyticsEventBuilder event(Event event) {
        this.event = event;
        return this;
    }

    /**
     * Put parameter and value.
     *
     * @param parameter
     * @param value
     * @return {@link AnalyticsEventBuilder}
     */
    public AnalyticsEventBuilder putParameter(Parameter parameter, Value value) {
        bundle.putString(parameter.name(), value.getValue());
        return this;
    }

    /**
     * Send event.
     *
     * @throws IllegalStateException No event is set.
     */
    public void send() {
        if (event == null) {
            throw new IllegalStateException("No event is set.");
        }
        firebaseAnalytics.logEvent(event.name(), bundle);
    }

}

Event.java

package com.example.taku;

/**
 * Analytics event.
 */
public enum Event {
    DISPLAY,
    TAP
}

Parameter.java

package com.example.taku;

/**
 * Analytics event parameter.
 */
public enum Parameter {
    SCREEN
}

Value.java

package com.example.taku;

/**
 * Value of analytics event parameter.
 */
public enum Value {
    MAIN,
    INPUT,
    SAVE_BUTTON;

    public String getValue() {
        return name().toLowerCase();
    }
}