Java tutorial
//package com.java2s; import android.view.Window; import android.view.WindowManager; public class Main { /** * force show virtual menu key </br> * must call after setContentView() * @param window you can use getWindow() */ public static void forceShowMenuKey(Window window) { try { window.addFlags(WindowManager.LayoutParams.class.getField("FLAG_NEEDS_MENU_KEY").getInt(null)); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (NoSuchFieldException e) { e.printStackTrace(); } } }