在写Android程序时，有时候会编写自定义的View，使用Inflater对象来将布局文件解析成一个View。本文主要目的是总结获取LayoutInflater对象的方法。
1、若能获取context对象，可以有以下几种方法：
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View child = inflater.inflate(R.layout.child, null);
or
LayoutInflater inflater = LayoutInflater.from(context);
View child = inflater.inflate(R.layout.child, null);
2、在一个Activity中，可以有以下方法：
View child = getLayoutInflater().inflate(R.layout.child, item, false);or
View view;
LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.mylayout, null);
方法1和方法2其实都是对context().getSystemService()的使用
3、使用View的静态方法：
View view=View.inflate(context, R.layout.child, null)
inflate实现源码如下：
/**
* Inflate a view from an XML resource.This convenience method wraps the {@link
* LayoutInflater} class, which provides a full range of options for view inflation.
*
* @param context The Context object for your activity or application.
* @param resource The resource ID to inflate
* @param root A view group that will be the parent.Used to properly inflate the
* layout_* parameters.
* @see LayoutInflater
*/
public static View inflate(Context context, int resource, ViewGroup root) {
LayoutInflater factory = LayoutInflater.from(context);
return factory.inflate(resource, root);
}LayoutInflater.from(context)实际上是对方法1的包装，可参考以下源码：
/**
* Obtains the LayoutInflater from the given context.
*/
public static LayoutInflater from(Context context) {
LayoutInflater LayoutInflater =
(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (LayoutInflater == null) {
throw new AssertionError("LayoutInflater not found.");
}
return LayoutInflater;
}
