player popup menu icons for white theme

app/src/main/java/org/schabi/newpipe/util/PopupMenuIconHacker.java

@@ -0,0 +1,48 @@
+package org.schabi.newpipe.util;
+
+import android.widget.PopupMenu;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+
+/**
+ * Created by Christian Schabesberger on 20.01.18.
+ * Copyright 2018 Christian Schabesberger <chris.schabesberger@mailbox.org>
+ * PopupMenuIconHacker.java is part of NewPipe
+ *
+ * License: GPL-3.0+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+public class PopupMenuIconHacker {
+    public static void setShowPopupIcon(PopupMenu menu) throws Exception {
+        try {
+            Field[] fields = menu.getClass().getDeclaredFields();
+            for (Field field : fields) {
+                if ("mPopup".equals(field.getName())) {
+                    field.setAccessible(true);
+                    Object menuPopupHelper = field.get(menu);
+                    Class<?> classPopupHelper = Class.forName(menuPopupHelper
+                            .getClass().getName());
+                    Method setForceIcons = classPopupHelper.getMethod(
+                            "setForceShowIcon", boolean.class);
+                    setForceIcons.invoke(menuPopupHelper, true);
+                    break;
+                }
+            }
+        } catch (Exception e) {
+            throw new Exception("Could not make Popup menu show Icons", e);
+        }
+    }
+}