实现LayoutInflater的实例化共有3种方法:
1. 通过SystemService获得
LayoutInflater inflater = (LayoutInflater)context.getSystemServices(Context.LAYOUT_INFLATER_SERVICES);
View view = inflater.inflate(R.layout.main, null);
2. 从给定的context中获得
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.mian, null);
3.
LayoutInflater inflater = getLayoutInflater();(在Activity中可以使用,实际上是View子类下window的一个函数)
Viewlayout = inflater.inflate(R.layout.main, null);
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