博客
关于我
Android 布局优化之<include/><merge/>和 <ViewStub>
阅读量:622 次
发布时间:2019-03-13

本文共 1956 字,大约阅读时间需要 6 分钟。

Excellent, let's optimize the provided content according to your requirements.

By marking up a layout for reuse in Android development, developers often need to reuse complex components like title bars. This can be efficiently achieved by creating a reusable layout file called include_toolbar.xml, which contains a Toolbar widget with a TextView inside it.

Here’s an example of the include_toolbar.xml layout file:

Now, in your activity_main, you can include this toolbar layout using the <include> tag:

When using the <include> tag in your layout, here are some important points to keep in mind:

  • The <include> tag’s id attribute will override the id attribute of the included layout’s root node.
  • The <include> tag’s layout_* attributes will override the included layout’s root node’s layout_* attributes.
  • In ConstraintLayout, using the <include> tag requires the included view to have layout_width and layout_height attributes defined.
  • To reduce the layout hierarchy levels, you can use the <merge> tag when including views. This helps in avoiding unnecessary nested layouts, which can affect performance:

    When this view is included in another layout, the <merge> tag will be ignored, and the buttons will be placed directly in the布局.

    If you need to load a layout only when it’s actually required, you can use the <ViewStub> tag. This allows you to defer the loading of these layouts until they are needed:

    The ViewStub layout can be inflated when needed using either:

    val errorView = findViewById
    (R.id.view_stub).inflate()

    It’s important to note that inflate() can only be called once. After the first call, the ViewStub will no longer be part of the view hierarchy, and its original id will only be valid until the layout is inflated.

    By following these principles, you can efficiently manage layout reuse and optimize your Android development workflow.

    转载地址:http://meoaz.baihongyu.com/

    你可能感兴趣的文章
    MySQL中你必须知道的10件事,1.5万字!
    查看>>
    MySQL中使用IN()查询到底走不走索引?
    查看>>
    Mysql中使用存储过程插入decimal和时间数据递增的模拟数据
    查看>>
    MySql中关于geometry类型的数据_空的时候如何插入处理_需用null_空字符串插入会报错_Cannot get geometry object from dat---MySql工作笔记003
    查看>>
    mysql中出现Incorrect DECIMAL value: '0' for column '' at row -1错误解决方案
    查看>>
    mysql中出现Unit mysql.service could not be found 的解决方法
    查看>>
    mysql中出现update-alternatives: 错误: 候选项路径 /etc/mysql/mysql.cnf 不存在 dpkg: 处理软件包 mysql-server-8.0的解决方法(全)
    查看>>
    Mysql中各类锁的机制图文详细解析(全)
    查看>>