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collate关键字是什么意思?
    查看>>
    MySql中的concat()相关函数
    查看>>
    mysql中的concat函数,concat_ws函数,concat_group函数之间的区别
    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中的四大运算符种类汇总20多项,用了三天三夜来整理的,还不赶快收藏
    查看>>
    mysql中的字段如何选择合适的数据类型呢?
    查看>>
    MySQL中的字符集陷阱:为何避免使用UTF-8
    查看>>
    mysql中的数据导入与导出
    查看>>
    MySQL中的时间函数
    查看>>
    mysql中的约束
    查看>>
    MySQL中的表是什么?
    查看>>