From http://blog.youkuaiyun.com/lmj623565791/article/details/38171465?utm_source=tuicool
简而言之,
Inflate(resId , null ) 只创建temp ,返回temp
Inflate(resId , parent, false )创建temp,然后执行temp.setLayoutParams(params);返回temp
Inflate(resId , parent, true ) 创建temp,然后执行root.addView(temp, params);最后返回root