Save last app version on preferences

app/src/main/java/org/isoron/helpers/DialogHelper.java

@@ -27,6 +27,8 @@ import android.util.DisplayMetrics;
 import android.view.View;
 import android.view.inputmethod.InputMethodManager;
 
+import org.isoron.uhabits.BuildConfig;
+
 public abstract class DialogHelper
 {
 
@@ -59,6 +61,12 @@ public abstract class DialogHelper
         prefs.edit().putInt("launch_count", count + 1).apply();
     }
 
+    public static void updateLastAppVersion(Context context)
+    {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+        prefs.edit().putInt("last_version", BuildConfig.VERSION_CODE).apply();
+    }
+
     public static int getLaunchCount(Context context)
     {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);

app/src/main/java/org/isoron/uhabits/MainActivity.java

@@ -73,6 +73,7 @@ public class MainActivity extends ReplayableActivity
     {
         PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
         DialogHelper.incrementLaunchCount(this);
+        DialogHelper.updateLastAppVersion(this);
         showTutorial();
 
         new AsyncTask<Void, Void, Void>() {