LayoutInflater类做什么? (在Android中)

问题描述

我无法理解Android中LayoutInflater的使用.

I am unable to understand the use of LayoutInflater in Android.

LayoutInflater的确切作用是什么，以及如何将其用于简单的Android应用程序?

What exactly is the role of LayoutInflater, and how to use it for a simple Android app?

推荐答案

什么是Layoutinflater?

LayoutInflater是一个类(某些实现或服务的包装)，您可以获取一个:

LayoutInflater is a class (wrapper of some implementation or service), you can get one:

LayoutInflater li = LayoutInflater.from(context);

---

如何使用Layoutinflater?

您向其提供XML布局文件.您无需提供完整的文件地址，只需提供R类中为您自动生成的文件资源ID.例如，布局文件如下所示:

You feed it an XML layout file. You need not give full file address, just its resource id, generated for you automatically in R class. For example, a layout file which look like:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent">

    <TextView
            android:id="@+id/text_view"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>

</LinearLayout>

另存为/res/layout/my_layout.xml.

您可以像这样将其提供给LayoutInflater:

You give it to LayoutInflater like:

  View v = li.inflate(R.layout.my_layout,null,false);

---

Layout Inflater是做什么的?

该v现在是一个LinearLayout对象，并且包含一个TextView对象，该对象按准确的顺序排列并设置了所有属性，我们在上面的XML中描述了.

That v is now a LinearLayout object , and contains a TextView object, arranged in exact order and with all properties set, as we described in the XML above.

TL; DR::LayoutInflater读取XML，其中描述了我们希望UI布局如何.然后，它将根据该XML为UI创建实际的View对象.

TL;DR: A LayoutInflater reads an XML in which we describe how we want a UI layout to be. It then creates actual Viewobjects for UI from that XML.

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