GAEventTracker.java

package nicommons.android.analytics;

import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceClickListener;
import android.view.View;

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

/**
 * Wraps a concrete *ClickListener to trigger a
 * {@link GoogleAnalyticsTracker#trackEvent(String, String, String, int)}
 * 
 * <p>
 * Works for {@link OnClickListener}, {@link android.view.View.OnClickListener}
 * and {@link OnPreferenceClickListener}.
 * </p>
 * 
 * <p>
 * NOTE: everything is public, but using only the corresponding full constructor
 * depending on the listener to wrap should be enough.
 * </p>
 */
public class GAEventTracker implements OnClickListener, android.view.View.OnClickListener, OnPreferenceClickListener {

    private OnClickListener delegateDialogOnClickListener;
    private android.view.View.OnClickListener delegateViewOnClickListener;
    private OnPreferenceClickListener delegateOnPreferenceClickListener;
    private GoogleAnalyticsTracker tracker;
    private EasyTracker easyTracker;
    private final String category;
    private final String action;
    private final String label;
    private final int value;

    public GAEventTracker(String _category, String _action, String _label, int _value) {
        category = _category;
        action = _action;
        label = _label;
        value = _value;
    }

    // CONSTRUCTORS for EasyTracker

    public GAEventTracker(EasyTracker _tracker, String _category, String _action, String _label, int _value) {
        this(_category, _action, _label, _value);
        easyTracker = _tracker;
    }

    public GAEventTracker(OnClickListener _delegateDialogOnClickListener, EasyTracker _tracker, String _category,
            String _action, String _label, int _value) {
        this(_tracker, _category, _action, _label, _value);
        delegateDialogOnClickListener = _delegateDialogOnClickListener;
    }

    public GAEventTracker(android.view.View.OnClickListener _delegateViewOnClickListener, EasyTracker _tracker,
            String _category, String _action, String _label, int _value) {
        this(_tracker, _category, _action, _label, _value);
        delegateViewOnClickListener = _delegateViewOnClickListener;
    }

    public GAEventTracker(OnPreferenceClickListener _delegateOnPreferenceClickListener, EasyTracker _tracker,
            String _category, String _action, String _label, int _value) {
        this(_tracker, _category, _action, _label, _value);
        delegateOnPreferenceClickListener = _delegateOnPreferenceClickListener;
    }

    // CONSTRUCTORS for GoogleAnalyticsTracker

    public GAEventTracker(GoogleAnalyticsTracker _tracker, String _category, String _action, String _label, int _value) {
        this(_category, _action, _label, _value);
        tracker = _tracker;
    }

    public GAEventTracker(OnClickListener _delegateDialogOnClickListener, GoogleAnalyticsTracker _tracker,
            String _category, String _action, String _label, int _value) {
        this(_tracker, _category, _action, _label, _value);
        delegateDialogOnClickListener = _delegateDialogOnClickListener;
    }

    public GAEventTracker(android.view.View.OnClickListener _delegateViewOnClickListener,
            GoogleAnalyticsTracker _tracker, String _category, String _action, String _label, int _value) {
        this(_tracker, _category, _action, _label, _value);
        delegateViewOnClickListener = _delegateViewOnClickListener;
    }

    public GAEventTracker(OnPreferenceClickListener _delegateOnPreferenceClickListener,
            GoogleAnalyticsTracker _tracker, String _category, String _action, String _label, int _value) {
        this(_tracker, _category, _action, _label, _value);
        delegateOnPreferenceClickListener = _delegateOnPreferenceClickListener;
    }

    // CHAIN SETTERS FOR THE TRACKER

    public GAEventTracker setTracker(EasyTracker _tracker) {
        easyTracker = _tracker;
        tracker = null;
        return this;
    }

    public GAEventTracker setTracker(GoogleAnalyticsTracker _tracker) {
        tracker = _tracker;
        easyTracker = null;
        return this;
    }

    // CHAIN SETTERS FOR THE WRAPPED LISTENER

    public GAEventTracker setListener(OnPreferenceClickListener _listener) {
        delegateOnPreferenceClickListener = _listener;
        return this;
    }

    public GAEventTracker setListener(android.view.View.OnClickListener _listener) {
        delegateViewOnClickListener = _listener;
        return this;
    }

    public GAEventTracker setListener(OnClickListener _listener) {
        delegateDialogOnClickListener = _listener;
        return this;
    }

    // UTILITY METHODS

    private void trackEvent() {
        if (tracker != null) {
            tracker.trackEvent(category, action, label, value);
        } else if (easyTracker != null) {
            easyTracker.trackEvent(category, action, label, value);
        } else {
            throw new IllegalStateException("No tracker was set !");
        }
    }

    // LISTENER IMPLEMENTATIONS

    @Override
    public boolean onPreferenceClick(Preference preference) {
        trackEvent();
        return delegateOnPreferenceClickListener.onPreferenceClick(preference);
    }

    @Override
    public void onClick(View view) {
        trackEvent();
        delegateViewOnClickListener.onClick(view);
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        trackEvent();
        delegateDialogOnClickListener.onClick(dialog, which);
    }

}