加入头文件:

import java.lang.reflect.Field;
import com.android.internal.view.menu.MenuPopupHelper;

 

加入反射:

        try {
            Field field = mPopupMenu.getClass().getDeclaredField("mPopup");
            field.setAccessible(true);
            MenuPopupHelper mHelper = (MenuPopupHelper) field.get(mPopupMenu);
            mHelper.setForceShowIcon(true);
        } catch (IllegalAccessException | NoSuchFieldException e) {
            e.printStackTrace();
        }
        //mPopupMenu.show();

 

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