位置: 编程技术 - 正文

Android - Designtime Layout Attributes & Tools Attributes

编辑:rootadmin
Designtime Layout AttributesAs of Android Studio 0.2., the layout rendering (used in both the layout editor as well as the XML editor layout preview window), supports designtime layout attributes.These are attributes which are used when the layout is rendered in the tool, but have no impact on the runtime. This is useful if you for example want to put sample data in your textfields for when you are editing the layout, but you don't want those attributes to affect your running app.To use designtime attributes, first make sure you have the tools namespace defined in your layout:<LinearLayout xmlns:android=" xmlns:tools=" android:layout_width="match_parent" ...The tools namespace is a specially recognized namespace by the Android tools, so all the attributes you define on view elements in the tools-namespace will be automatically stripped when the application is packaged and there is no runtime overhead.Then, to for example set the text of a text field, use the same attribute as you would from the Android framework, but use the tools: namespace rather than the android: namespace: <TextView android:text="Name:" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <EditText tools:text="John Doe" android:layout_width="wrap_content" android:layout_height="wrap_content" />In the above, the Name label is using the normal text attribute, and will be shown at runtime. However, the text field is using a designtime attribute, so it will appear in the tool, but not at runtime. In general, you can set any Android framework attribute as a designtime attribute; just use the tools: namespace rather than the android: namespace. Note also that you don't have to choose either/or; you can set both the Android namespace attribute (which will be used at runtime) and a tools attribute (which will override the runtime attribute at designtime only).You can also use designtime attributes to unset an attribute while in the tools. For example, there is a bug ( that you cannot use the fastScrollAlwaysVisible attribute on ListViews in the layout editor. However, you may still want that attribute set at runtime. With designtime attributes you can work around it like this: <ListView android:id="@&#;id/listView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:fastScrollAlwaysVisible="true" tools:fastScrollAlwaysVisible=""/>Here's another example; we have a FrameLayout with multiple children, and at designtime we only want to see one of them, let's say the second child: We can use the tools:visibility attribute: <Button android:id="@&#;id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="First" tools:visibility="invisible" /> <Button android:id="@&#;id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Second" tools:visibility="visible" />(Instead of visibility="invisible" you may want to use visibility="gone", depending on your needs.)LimitationsCurrently only overriding existing attributes is supported. We may want to define some additional convenience attributes to make it simple to for example choose which child in a ViewFlipper to show etc.You have to manually edit in your designtime attributes at this timeThey do not appear as an option in for example the layout editor property sheet. Editor code completion does not help you enter these attributes; the easiest way to use them is to first enter them in the Android namespace, and when done replacing the prefix.Note that designtime attributes are supported only for layout files themselves. You cannot use them anywhere else -- in menu XML files, in string resource definitions, etc.Designtime attributes can only be used for framework resources, not custom attributes at this point.See for background or additional requests or commentsTools AttributesAndroid has a dedicated XML namespace intended for tools to be able to record information in XML files, and have that information stripped when the application is packaged such that there is no runtime or download size penalty. The namespace URI and is usually bound to the tools: prefix:<FrameLayout xmlns:android=" xmlns:tools=" android:layout_width="match_parent" android:layout_height="match_parent" > ....This document records our current uses of tools attributes. (NOTE: These may change over time.)tools:ignoreThis attribute can be set on any XML element, and is a comma separated list of lint issue ID's that should be ignored on this element or any of its children, recursively.<string name="show_all_apps" tools:ignore="MissingTranslation">All</string>Used by: Linttools:targetApiThis attribute is like the @TargetApi annotation in Java classes: it lets you specify an API level, either as an integer or as code name, that this element is known to be running on. <GridLayout tools:targetApi="ICE_CREAM_SANDWICH" >Used by: Linttools:localeThis attribute can be set on the root element in a resource value file and should correspond to a language and optionally a region. This will let tools know what language (locale) the strings in the file are assumed to be. For example, values/strings.xml can have this root element:<resources xmlns:tools=" tools:locale="es">Now we know that the language used for strings in the default values folder is Spanish rather than English.Used by: Lint, Studio (to disable spell checking in non-English resource files)tools:contextThis attribute is typically set on the root element in a layout XML file, and records which activity the layout is associated with (at designtime, since obviously a layout can be used by more than one layout). This will for example be used by the layout editor to guess a default theme, since themes are defined in the Manifest and are associated with activities, not layouts. You can use the same dot prefix as in manifests to just specify the activity class without the full application package name as a prefix.<android.support.v7.widget.GridLayout xmlns:android=" xmlns:tools=" tools:context=".MainActivity" ... >Used by: Layout editors in Studio & Eclipse, Linttools:layoutThis attribute is typically set in a <fragment> tag and is used to record which layout you want to see rendered at designtime (at runtime, this will be determined by the actions of the fragment class listed by the tag).<fragment android:name="com.example.master.ItemListFragment" tools:layout="@android:layout/list_content" />Used by: Layout editors in Studio & Eclipsetools:listitem / listheader / listfooterThese attributes can be used on a <ListView> (or other AdapterView children like <GridView>, <ExpandableListView> etc) to specify layouts to use for the list items, as well as list headers and list footers, at designtime. The tool will fill in dummy data to show a list with some representative contents. <ListView android:id="@android:id/list" android:layout_width="match_parent" android:layout_height="match_parent" tools:listitem="@android:layout/simple_list_item_2" />Used by: Layout editors in Studio & Eclipsetools:showInAttribute set on the root element of a layout that <include>'ed by another layout. This allows you to point to one of the layouts which includes this layout, and at designtime this included layout will be rendered with the outer layout surrounding it. That allows you to view and edit the layout "in context". Requires Studio 0.5.8 or later. More information in the release announcement.<?xml version="1.0" encoding="utf-8"?><TextView xmlns:android=" xmlns:tools=" android:text="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" tools:showIn="@layout/activity_main" />Used by: Layout editor in Studiotools:menuAttribute set on the root element of a layout to configure the menus to be shown in the Action Bar. Android Studio tries to figure out which menus to use in the ActionBar by looking at the onCreateOptionsMenu() method in the activity linked to the layout (by tools:context). This allows you to override that search and explicitly state which menus to show. The value is a comma separated list of ids (without @id/ or any such prefix). You can also use the file names of the menu xml without the .xml extension. Requires Studio 0.8.0 or later.<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=" xmlns:tools=" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" tools:menu="menu1,menu2" />Used by: Layout editor in Studiotools:actionBarNavModeAttribute set on the root element of a layout to configure the navigation mode used by the Action Bar. Possible values include: "standard", "list" and "tabs" Requires Studio 0.8.0 or later.<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=" xmlns:tools=" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" tools:actionBarNavMode="tabs" />Used by: Layout editor in Studioref1:

推荐整理分享Android - Designtime Layout Attributes & Tools Attributes,希望有所帮助,仅作参考,欢迎阅读内容。

Android - Designtime Layout Attributes & Tools Attributes

文章相关热门搜索词:,内容如对您有帮助,希望把文章链接给更多的朋友!

Android异常 本文重在Java中异常机制的一些概念。写本文的目的在于方便我很长时间后若是忘了这些东西可以通过这篇文章迅速回忆起来。1.异常机制1.1异常机制是

FrameLayout(框架布局) 框架布局是最简单的布局形式。所有添加到这个布局中的视图都以层叠的方式显示。第一个添加的控件被放在最底层,最后一个添加到框架布局中的视

android 画画板 importjava.io.File;importjava.io.FileNotFoundException;importjava.io.FileOutputStream;importandroid.net.Uri;importandroid.os.Bundle;importandroid.os.Environment;importandroid.app.Activity;importandroi

标签: Android - Designtime Layout Attributes & Tools Attributes

本文链接地址:https://www.jiuchutong.com/biancheng/376533.html 转载请保留说明!

上一篇:Android 手机影音 学习过程记录(三)(安卓版影音播放器哪个好用)

下一篇:Android异常(Android异常重启保护机制)

  • 如何申报个人所得税减免项目
  • 煤炭企业生产能力
  • 发票弄丢下一步怎么办
  • 工业企业员工工资占收入比例
  • 企业发票专用章使用涉及的审批流程
  • 客户退货金额小怎么说
  • 现金管理规定有哪些主要内容
  • 冬虫夏草开票什么税率
  • 年底自查
  • 案例分析关于拟建科学馆的请示报告
  • 第二个季度
  • 维修属于劳务还是劳务
  • 小微企业减免所得税
  • 购销合同印花税计税依据
  • 冲回坏账准备分录
  • 发票有几个
  • 1697510605
  • 本期应付而未付工资挂账处理?
  • 员工有多处收入怎么申报个人所得税
  • 库存商品售价
  • 计提代扣代缴个税
  • Win10打开浏览器后自动弹出查找框
  • php utf8转gb2312
  • 本月印花税下月缴纳需要计提吗
  • 劳务费支出会计处理
  • 投资性房地产期末公允价值大于账面价值
  • hp workwise service是什么
  • 企业财务人员如何防范电信诈骗
  • php如何实现登录和注册
  • redistemplate获取value
  • 红字增值税专用发票信息表怎么填
  • 带息票据和不带息票据区别
  • 企业利润取出税费有哪些
  • 图书发票怎么开
  • 微信小程序实现支付功能
  • dpkg -s命令
  • 拨出专款年末结转
  • opencv+python
  • 水费发票掉了可以补打吗
  • 其他权益工具投资是什么意思
  • 未认证的进项税发票入账
  • 2、springboot+mybatis+ajax+pageHelper+idea+maven(全套增删改查)
  • 账上没有实收资本
  • 固定资产不折旧不摊销怎么做账
  • 固定资产清理是三栏式还是多栏式
  • 生育津贴现在可以打个人账户么
  • 餐饮行业的个体工商户怎么交税
  • 收到社保稳岗补贴需要交税吗
  • 总记账凭证核算怎么做
  • 坏账核销在企业所得税汇算清缴的填写
  • 租赁行业的增值税率
  • 汽车高速公路收费卡
  • 应付职工薪酬的工资是实发工资还是应发工资
  • 资产损失根据发票核算
  • 如何解绑企业开票员身份
  • 食堂的电费能分两次交吗
  • MySQL通过触发器解决数据库中表的行数限制详解及实例
  • windowsxp能用pr吗
  • ios自定义应用图标
  • freebsd版本选择
  • win7修改系统版本
  • 苹果电脑怎么打开u盘
  • Ubuntu 8.10 Server Ruby 的安装方法
  • linux ed
  • opengl oes纹理
  • Node.js中的核心模块包括哪些内容?
  • node.js入门
  • 安卓安全警告怎么关闭
  • sed删除文件中的目录
  • shell脚本运行linux命令
  • 3种不同的播种方法
  • Python工程师面试题 与Python基础语法相关
  • android 标签页
  • UNITY gameobject代码中setacvtive(false)与面板中直接去掉勾 效果不一样
  • javascript中字符串
  • 怎么申请冬季取暖补贴
  • 青岛网上办税服务厅登录
  • 陕西省12366纳税服务热线
  • 买二手房土地证怎么过户
  • 建筑行业的公司近期出现的问题
  • 免责声明:网站部分图片文字素材来源于网络,如有侵权,请及时告知,我们会第一时间删除,谢谢! 邮箱:opceo@qq.com

    鄂ICP备2023003026号

    网站地图: 企业信息 工商信息 财税知识 网络常识 编程技术

    友情链接: 武汉网站建设