Add a boolean pref to disable EventLogging based tracking

commons/src/main/java/org/wikimedia/commons/CommonsApplication.java

@@ -7,6 +7,7 @@ import java.net.URI;
 
 import android.accounts.*;
 import android.app.Application;
+import android.content.SharedPreferences;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.graphics.Bitmap;
@@ -98,6 +99,10 @@ public class CommonsApplication extends Application {
             // LET US WIN THE AWARD FOR DUMBEST CHECKED EXCEPTION EVER!
             throw new RuntimeException(e);
         }
+
+        // Enable / disable tracking based on user preference. Defaults to true
+        SharedPreferences settings = getSharedPreferences(Prefs.GLOBAL_PREFS, MODE_PRIVATE);
+        EventLog.enabled = settings.getBoolean(Prefs.TRACKING_ENABLED, EventLog.enabled);
     }
     
     public MWApi getApi() {

commons/src/main/java/org/wikimedia/commons/EventLog.java

@@ -9,6 +9,10 @@ import java.io.IOException;
 import java.net.*;
 
 public class EventLog {
+
+    // Set to false in CommonsApplication if the user has disabled tracking
+    public static boolean enabled = false;
+
     private static class LogTask extends AsyncTask<LogBuilder, Void, Boolean> {
 
         @Override
@@ -87,6 +91,9 @@ public class EventLog {
         }
 
         public void log() {
+            if(!enabled) {
+                return; // User has disabled tracking
+            }
             LogTask logTask = new LogTask();
             Utils.executeAsyncTask(logTask, this);
         }

commons/src/main/java/org/wikimedia/commons/Prefs.java

@@ -0,0 +1,7 @@
+package org.wikimedia.commons;
+
+public class Prefs {
+    public static String GLOBAL_PREFS = "org.wikimedia.commons.preferences";
+
+    public static String TRACKING_ENABLED = "eventLogging";
+}