/**     *     * @return     */    public boolean phoneHasNav(){        boolean flag = false;        if(Build.VERSION.SDK_INT < 14){            flag = false;        }else {            View content = getWindow().getDecorView().findViewById(android.R.id.content);            if (content != null) {                WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);                Display display = wm.getDefaultDisplay();                Point point = new Point();                display.getRealSize(point);                if (isScreenPortrait()) {                    int bottom = content.getBottom();// 页面的底部                    if (bottom != point.y) {                        flag = true;                    }                }else {                    int right = content.getRight();                    if (right != point.y) {                        flag = true;                    }                }            }        }        return flag;    }    /** 获取屏幕是否是竖屏     * @return     */    @SuppressLint("SwitchIntDef")    public boolean isScreenPortrait(){        int or = getRequestedOrientation();        switch (or) {            case ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE :// 横屏            case ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE:                return false;            case ActivityInfo.SCREEN_ORIENTATION_PORTRAIT :// 竖屏            case ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT:                return true;            default:                return true;        }    }

这个是很精确地，写在Activity里面就可以使用了。原来是根据当前页面的底部和屏幕真实的高度做判断。很精确。我自己发明的。真的是，自己想的办法。卧槽。根据布局自己一点一点的试出来的。