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中的 +号 和 CONCAT(str1,str2,...)
    查看>>
    MySQL中的count函数
    查看>>
    MySQL中的DB、DBMS、SQL
    查看>>
    MySQL中的DECIMAL类型:MYSQL_TYPE_DECIMAL与MYSQL_TYPE_NEWDECIMAL详解
    查看>>
    MySQL中的GROUP_CONCAT()函数详解与实战应用
    查看>>
    MySQL中的IO问题分析与优化
    查看>>
    MySQL中的ON DUPLICATE KEY UPDATE详解与应用
    查看>>
    mysql中的rbs,SharePoint RBS:即使启用了RBS,内容数据库也在不断增长
    查看>>
    mysql中的undo log、redo log 、binlog大致概要
    查看>>
    Mysql中的using
    查看>>
    MySQL中的关键字深入比较:UNION vs UNION ALL
    查看>>
    Mysql主从不同步
    查看>>
    mysql主从同步及清除信息
    查看>>
    MySQL主从篇:死磕主从复制中数据同步原理与优化
    查看>>
    mysql主从配置
    查看>>
    MySQL之2003-Can‘t connect to MySQL server on ‘localhost‘(10038)的解决办法
    查看>>
    MySQL之DML
    查看>>
    mysql之分组查询GROUP BY,HAVING
    查看>>
    mysql之分页查询
    查看>>
    mysql之子查询
    查看>>