Android开发constraintlayout 的相关内容

Android开发 - 掌握ConstraintLayout（十）按比例设置视图大小

有时候在布局界面的时候，UI要求某个View或者某张图片按比例显示，以适应不同的屏幕分辨率。通常我们时通过自定义View或者引入第三方的库来解决。现在我们既然已经使用了ConstraintLayout，它本身就支持这样的按比例设置View大小的功能。下面我们来介绍如何使用：首先我们在布局中添加...

Android开发 - 掌握ConstraintLayout（九）分组(Group)

使用ConstraintLayout后我们的布局是没有层级关系的，各个View之间都是平级关系，但是如果根据某个业务条件来控制多个View的显示与否，我们需要分别对每个View进行控制，需要调用多次setVisibility()。这样就显得非常不方便。本文所介绍的Group就是解决这个问题的。 G...

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Android开发 - 掌握ConstraintLayout（八）障碍线(Barrier)

本文我们来介绍障碍线(Barrier)的使用，平常在开发中用的相对要少一些，但是在需要时会非常方便。它的作用是将多个元素放到这个障碍线里面使时，其中的任何元素的大小或位置变化时都会使它的位置进行改变。可以理解成一面墙，"墙"里面任何元素的位置或大小改变时都会导致它的改变，从而保证所有的元素都在"...

Android开发 - 掌握ConstraintLayout（七）辅助线(Guideline)

了解过UI设计的同学都知道，在设计的时候，我们经常在界面上拖进一些辅助线来帮我们对齐UI元素，或者方便我们统一的页边距。在ConstraintLayout的编辑器中，同样也支持这样的功能，我们可以创建一些横向的或者纵向的Guideline，在布局界面的时候可以充分利用这些辅助线，对齐我们的View...

Android开发 - 掌握ConstraintLayout（六）链条(Chains)

本文我们介绍链条(Chains)，使用它可以将多个View连接起来，互相约束。可以创建横向的链条，也可以创建纵向的链条，我们以横向的链条举例：我们先创建三个按钮：我们选中三个按钮后在上面点右键创建链条：创建后我们发现这三个View平均分布地排列了：最简单的使用是平均分布，当然也可以不平均分...

Android开发 - 掌握ConstraintLayout（五）偏差(Bias)

比如实现这样一个场景: "在屏幕宽度的1/4的地方放置一个View" 使用传统布局时，实现按照屏幕的宽度（高度），或者相对两个View之间距离的一个比例来进行布局，就显得非常麻烦，但是当使用ConstraintLayout时，就可以很简单地实现这样的需求。 Bias Bias就是为了实现这种需求而设...

Android开发 - 掌握ConstraintLayout（三）编辑器

从本篇博客开始我们开始介绍如何使用ConstraintLayout。既然ConstraintLayout叫约束布局，首先我们先介绍什么叫约束（Constraints）：约束（Constraints）一个约束表示View之间的"布局约束"关系，以及约束的位置，类似RelativeLayout的"相...

Android开发 - 掌握ConstraintLayout（二）介绍

介绍发布时间 ConstraintLayout是在2016的Google I/O大会上发布的，经过这么长时间的更新，现在已经非常稳定。支持Android 2.3(API 9)+ 目前的Android设置几乎没有低于Android4.4(Api 19)的，所以ConstraintLayout可以支...

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