Android判断NavigationBar是否显示的方法（获取屏幕真实的高度）

public boolean isNavigationBarShow(){  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {    Display display = getWindowManager().getDefaultDisplay();    Point size = new Point();    Point realSize = new Point();    display.getSize(size);    display.getRealSize(realSize);    return realSize.y!=size.y;  }else {    boolean menu = ViewConfiguration.get(this).hasPermanentMenuKey();    boolean back = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_BACK);    if(menu || back) {      return false;    }else {      return true;    }  }}public static int getNavigationBarHeight(Activity activity) {  if (!isNavigationBarShow(activity)){    return 0;  }  Resources resources = activity.getResources();  int resourceId = resources.getIdentifier("navigation_bar_height",      "dimen", "android");  //获取NavigationBar的高度  int height = resources.getDimensionPixelSize(resourceId);  return height;}public static int getSceenHeight(Activity activity) {  return activity.getWindowManager().getDefaultDisplay().getHeight()+getNavigationBarHeight(activity);}