@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //1.设置主页面
    setContentView(R.layout.activity_main);

    //2.设置左侧菜单
    setBehindContentView(R.layout.activity_leftmenu);

    //3.设置右侧菜单
    SlidingMenu slidingMenu = getSlidingMenu();
    slidingMenu.setSecondaryMenu(R.layout.activity_rightmenu);//设置右侧菜单

    //4.设置显示的模式：左侧菜单+主页，左侧菜单+主页面+右侧菜单；主页面+右侧菜单
    slidingMenu.setMode(SlidingMenu.LEFT);

    //5.设置滑动模式：滑动边缘，全屏滑动，不可以滑动
    slidingMenu.setTouchModeAbove(SlidingMenu.TOUCHMODE_FULLSCREEN);

    //6.设置主页占据的宽度
    slidingMenu.setBehindOffset(DensityUtil.dip2px(MainActivity.this,200));