Add color inverted lotus placeholder

app/src/main/java/app/insti/Utils.java

@@ -50,6 +50,7 @@ public final class Utils {
     private static String sessionId;
     private static RetrofitInterface retrofitInterface;
     public static Gson gson;
+    public static boolean isDarkTheme = false;
 
     public static final void loadImageWithPlaceholder(final ImageView imageView, final String url) {
         Picasso.get()
@@ -232,6 +233,7 @@ public final class Utils {
     }
 
     public static void changeTheme(SettingsFragment fragment, boolean darkTheme) {
+        isDarkTheme = darkTheme;
         FragmentActivity fragmentActivity = fragment.getActivity();
         fragmentActivity.setTheme(darkTheme ? R.style.AppThemeDark : R.style.AppTheme);
 

app/src/main/java/app/insti/activity/MainActivity.java

@@ -118,7 +118,8 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
 
         /* Check for dark theme */
         SharedPreferences sharedPref = getSharedPreferences(Constants.PREF_NAME, Context.MODE_PRIVATE);
-        if(sharedPref.getBoolean(Constants.DARK_THEME, false))
+        Utils.isDarkTheme = sharedPref.getBoolean(Constants.DARK_THEME, false);
+        if (Utils.isDarkTheme)
             this.setTheme(R.style.AppThemeDark);
 
         ServiceGenerator serviceGenerator = new ServiceGenerator(getApplicationContext());

app/src/main/java/app/insti/adapter/FeedAdapter.java

@@ -37,6 +37,6 @@ public class FeedAdapter extends CardAdapter<Event> {
 
     @Override
     public int getAvatarPlaceholder(Event event) {
-        return R.drawable.lotus_placeholder;
+        return Utils.isDarkTheme ? R.drawable.lotus_placeholder_dark : R.drawable.lotus_placeholder;
     }
 }

app/src/main/java/app/insti/adapter/GenericAdapter.java

@@ -33,6 +33,6 @@ public class GenericAdapter extends CardAdapter<CardInterface> {
         if (cardInterface instanceof User) {
             return R.drawable.user_placeholder;
         }
-        return R.drawable.lotus_placeholder;
+        return Utils.isDarkTheme ? R.drawable.lotus_placeholder_dark : R.drawable.lotus_placeholder;    
     }
 }