如何从XML定义片段的布局？ [英] How can I define a fragment's layout from XML?

问题描述

我正在尝试用XML定义片段的布局，就像我定义视图布局一样。

I'm trying to define a fragment's layout in XML in the same way that I defined the layout of my view.

这可能吗？我尝试了几件事，但似乎都没有。

Is this possible? I tried several things, but none of them seem to work.

我的活动布局如下（main.xml）：

My activity layout looks as follows (main.xml):

<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
  <fragment
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:name="full.lommeregner.Lommeregnerrv2Activity"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/lommeregnerv2">
    </fragment>   

</ListView>

现在，由于我不是通过原始Java代码生成布局的忠实粉丝，我尝试定义我的片段如下（fragment_lommeregner.xml）：

Now, since I'm not a big fan of generating layouts through raw Java code, I tried defining my fragment as follows (fragment_lommeregner.xml):

  <fragment
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:name="full.lommeregner.Lommeregnerrv2Activity"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/lommeregnerv2">
       <!-- my content was located here (some textviews, buttons and so on). -->
    </fragment> 

我做错了什么？如何通过XML定义片段的布局？

Am I doing something wrong? How can I define the layout of a fragment through XML?

推荐答案

片段与活动非常相似，因为你需要一个与它一起使用的Java类文件。您不能仅通过创建片段布局来创建片段 - 您需要一个片段类：

A Fragment works much like an activity, in that you need a Java class file to go with it. you cannot create a Fragment just by creating a fragment layout - you need a class for your fragment:

1. 创建布局XML和Activity子类您的活动


2. 为您的片段创建布局XML和Fragment子类


3. 在Activity布局XML中将两者绑定在一起（或者如果使用FragmentTransaction，则使用FragmentTransaction你想用Java代码做到这一点）

如果你还没有这样做，请阅读，重新阅读和消化所有内容此页：
https://developer.android.com/guide/components /fragments.html

If you haven't already done so, read, re-read and digest everything on this page: https://developer.android.com/guide/components/fragments.html

那里有很多，但片段是Android应用程序的重要组成部分，因此需要阅读。好消息是碎片的基础非常简单。

There's a lot there, but Fragments are an essential part of Android apps now so it's required reading. The good news is that the basics of fragments is pretty simple.

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