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auto_increment有什么作用?(IT枫斗者)
    查看>>
    MySQL中B+Tree索引原理
    查看>>
    mysql中cast() 和convert()的用法讲解
    查看>>
    mysql中datetime与timestamp类型有什么区别
    查看>>
    MySQL中DQL语言的执行顺序
    查看>>
    mysql中floor函数的作用是什么?
    查看>>
    MySQL中group by 与 order by 一起使用排序问题
    查看>>
    mysql中having的用法
    查看>>
    MySQL中interactive_timeout和wait_timeout的区别
    查看>>
    mysql中int、bigint、smallint 和 tinyint的区别、char和varchar的区别详细介绍
    查看>>
    mysql中json_extract的使用方法
    查看>>
    mysql中json_extract的使用方法
    查看>>
    mysql中kill掉所有锁表的进程
    查看>>
    mysql中like % %模糊查询
    查看>>
    MySql中mvcc学习记录
    查看>>
    mysql中null和空字符串的区别与问题!
    查看>>
    MySQL中ON DUPLICATE KEY UPDATE的介绍与使用、批量更新、存在即更新不存在则插入
    查看>>
    MYSQL中TINYINT的取值范围
    查看>>
    MySQL中UPDATE语句的神奇技巧,让你操作数据库如虎添翼!
    查看>>
    Mysql中varchar类型数字排序不对踩坑记录
    查看>>