Usualminds · Usualminds · Dec 20, 2020 · Dec 16, 2020 · Dec 17, 2020 · Dec 17, 2020
diff --git a/article/2020/exploring-constraintlayout-2-0-in-android.md b/article/2020/exploring-constraintlayout-2-0-in-android.md
@@ -1,58 +1,58 @@
-> * 原文地址：[Exploring ConstraintLayout 2.0 in Android](https://medium.com/better-programming/exploring-constraintlayout-2-0-in-android-317584003ee9)
-> * 原文作者：[Siva Ganesh Kantamani](https://medium.com/@sgkantamani)
-> * 译文出自：[掘金翻译计划](https://github.com/xitu/gold-miner)
-> * 本文永久链接：[https://github.com/xitu/gold-miner/blob/master/article/2020/exploring-constraintlayout-2-0-in-android.md](https://github.com/xitu/gold-miner/blob/master/article/2020/exploring-constraintlayout-2-0-in-android.md)
-> * 译者：
-> * 校对者：
+> - 原文地址：[Exploring ConstraintLayout 2.0 in Android](https://medium.com/better-programming/exploring-constraintlayout-2-0-in-android-317584003ee9)
+> - 原文作者：[Siva Ganesh Kantamani](https://medium.com/@sgkantamani)
+> - 译文出自：[掘金翻译计划](https://github.com/xitu/gold-miner)
+> - 本文永久链接：[https://github.com/xitu/gold-miner/blob/master/article/2020/exploring-constraintlayout-2-0-in-android.md](https://github.com/xitu/gold-miner/blob/master/article/2020/exploring-constraintlayout-2-0-in-android.md)
+> - 译者：[keepmovingljzy](https://github.com/keepmovingljzy)
+> - 校对者：[regon-cao](https://github.com/regon-cao)、[happySteveQi](https://github.com/happySteveQi)
 
-# Exploring ConstraintLayout 2.0 in Android
+# 探索 Android 中的 ConstraintLayout 2.0
 
 ![Photo by [rafzin p](https://unsplash.com/@rafzin?utm_source=medium&utm_medium=referral) on [Unsplash](https://unsplash.com?utm_source=medium&utm_medium=referral)](https://cdn-images-1.medium.com/max/8942/0*goSdyD-yGtjIfUCP)
 
-## Introduction
+## 介绍
 
-`ConstraintLayout` is one of the powerful Jetpack libraries that allows developers to create complex and responsive UI quickly with interactive tooling built into Android Studio, in order to preview your XML.
+`ConstraintLayout` 是功能强大的 Jetpack 库之一，开发人员可以使用 Android Studio 内置的交互工具结合该库快速创建复杂且响应迅速的布局，同时预览该 XML 布局。
 
-One of the significant advantages of `ConstraintLayout` is that we can build complex UI with a flat view hierarchy (no nested view groups). This result is drawing a lesser number of layers, which increases the performance.
+ `ConstraintLayout` 的一大优点是我们可以使用单层视图层次结构（无嵌套视图）构建复杂的布局。由于绘制的视图层数更少，性能自然就提高了。
 
-#### A few key features of ConstraintLayout
+#### ConstraintLayout的一些关键功能
 
-1. We can position the views relatively one another.
-2. We can center the views using bias or other views.
-3. We can specify the aspect ratio of the view.
-4. We can group and chain the views.
+1. 我们可以指定视图的相对位置。
+2. 我们可以使用偏移或其他视图来居中视图。
+3. 我们可以指定视图的宽高比例。
+4. 我们可以对视图进行分组和链接。
 
-#### A few helper objects
+#### 一些辅助布局
 
-Helper objects are the objects that are not visible to the user but come in handy to align developers’ views.
+辅助布局是用户看不见的布局，但是可以方便开发人员对齐视图。
 
-* `Guideline`
-* `Barrier`
-* `Placeholder`
+- `Guideline`
+- `Barrier`
+- `Placeholder`
 
-To learn more about `ConstraintLayout` v1.0, read this [article](https://medium.com/better-programming/essential-components-of-constraintlayout-7f4026a1eb87).
+要了解 `ConstraintLayout` v1.0 的更多信息，请阅读这篇[文章](https://medium.com/better-programming/essential-components-of-constraintlayout-7f4026a1eb87)。
 
 ## ConstraintLayout 2.0
 
-Enough with the history lessons. It’s time to integrate v2.0 of `ConstraintLayout` into your project. To do so, add the following line under the dependencies tag in `build.gradle` file.
+在充分了解完它的历史之后，是时候将`ConstraintLayout` v2.0 集成到您的项目中了。要引入它需要在 build.gradle 文件中添加如下依赖。
 
 ```
 implementation “androidx.constraintlayout:constraintlayout:2.0.1”
 ```
 
-This version brings several new features to `ConstraintLayout`; let’s start digging into them without any delay.
+这个版本为`ConstraintLayout`带来了几个新功能。让我们马上来研究一下吧。
 
 ## Flow
 
-`Flow` is a new virtual layout added in v2, similar to the group in v1. It’s a combination of `Chain` and `Group`, with special powers. In simple words, `Flow` chains the views with dynamic size at runtime.
+`Flow` 是 v2 版本中新增的虚拟布局方式，类似于v1版本中的 `group` 。它是 `Chain` 和 `Group` 布局的一个结合，具有特殊的功能。简而言之就是 `Flow` 在运行时根据布局的大小动态链接视图。
 
-Similar to `Group`, `Flow` also takes the reference view IDs and creates a `Chain` behavior. One of the vital advantages that `Flow` offers is `wrapMode` (a way to configure the views when they overflow). Out of the box, we’ve three modes to choose from: `none`, `aligned`, and `chain`.
+与 `Group` 类似，`Flow` 同样也是通过获取视图的ID并创建 `Chain` 所具有的行为。使用 `Flow` 布局重要优势之一是 `wrapMode`（一种在视图溢出时配置视图的方法）。添加该布局属性即可使用，我们提供三种模式供您选择：`none`，`aligned` 和 `chain`。
 
 ![Flow mode : none, chain and aligned](https://cdn-images-1.medium.com/max/2000/0*RK2f87Te_cm259Gg)
 
-* `[wrap none](https://developer.android.com/reference/androidx/constraintlayout/helper/widget/Flow#wrap_none) `: Creates a chain out of the referenced views
-* `[wrap chain](https://developer.android.com/reference/androidx/constraintlayout/helper/widget/Flow#wrap_chain)` : Creates multiple chains (one after the other) only if the referenced views do not fit
-* `[wrap aligned](https://developer.android.com/reference/androidx/constraintlayout/helper/widget/Flow#wrap_aligned)` : Similar to `wrap chain`, but will align the views by creating rows and columns
+- `[wrap none](https://developer.android.com/reference/androidx/constraintlayout/helper/widget/Flow#wrap_none) `: 所有引用的视图形成一条链
+- `[wrap chain](https://developer.android.com/reference/androidx/constraintlayout/helper/widget/Flow#wrap_chain)` : 仅当引用的视图不适合时才创建多个链（一个接一个）
+- `[wrap aligned](https://developer.android.com/reference/androidx/constraintlayout/helper/widget/Flow#wrap_aligned)` : 与 `wrap chain` 类似，但是将通过创建行和列来对齐视图
 
 ```XML
 <?xml version="1.0" encoding="utf-8"?>
@@ -116,17 +116,17 @@ Similar to `Group`, `Flow` also takes the reference view IDs and creates a `Chai
 </androidx.constraintlayout.widget.ConstraintLayout>
 ```
 
-This feature seems simple, but we can create flow layouts using `ConstraintLayout` 2.0. We no longer need to use flow layout libraries anymore.
+这个功能看起来很简单，不过我们可以使用 `ConstraintLayout` 2.0 创建流式布局。不再需要使用其他流式布局库。          
 
-Before `ConstraintLayout` 2.0, we had to calculate the remaining space after rendering each view to make sure the next view fits in there, else we’ve to align it in the next line. But now we need to use `Flow`.
+在 `ConstraintLayout` 2.0 之前，我们必须在渲染每个视图之后计算剩余空间，来确定下一个视图是否有足够的空间适合存放，否则我们必须将其对齐到下一行。但是现在我们只要使用 `Flow` 就可以了。
 
-To learn more about `Flow`, [read the official docs](https://developer.android.com/reference/androidx/constraintlayout/helper/widget/Flow).
+要了解有关 `Flow` 的更多信息，请[阅读官方文档](https://developer.android.com/reference/androidx/constraintlayout/helper/widget/Flow)。
 
 ## Layer
 
-`Layer` is the new helper in `ConstraintLayout` 2.0, similar to `Guideline`s and `Barrier`s. We can create a virtual layer like a group with multiple referenced views. Once the views are referenced, we can apply transformations on those views using `Layer`.
+`Layer` 是 `ConstraintLayout` 2.0 中的新增的辅助布局方式，类似于 `Guideline` 和 `Barrier` 的辅助布局方式。我们可以通过创建一个虚拟图层，类似与一个父视图(Layer)中有多个子视图的方式。一旦子视图引用了父视图，我们就可以使用 `Layer` 对这些视图进行转换。
 
-It’s similar to a `Group` helper, where we can bind multiple views and perform basic actions like visibility (visible and gone). With `Layer`, we can take it to the next level. We can apply animations to `rotate`, `translate`, or `scale `multiple views together.
+它类似于 `Group` 布局，我们可以通过它绑定多个视图并设置其可见性（可见和消失）等基本操作。一旦视图被 `Layer` 引用，我们的视图就可以使用 `Layer` 给我们带来的那些转换功能了。我们可以对多个视图做旋转，平移，缩放或者组合动画。
 
 ```XML
 <androidx.constraintlayout.helper.widget.Layer
@@ -141,18 +141,18 @@ It’s similar to a `Group` helper, where we can bind multiple views and perform
 
 ## MotionLayout
 
-`MotionLayout` is a subclass of `ConstraintLayout` that includes all of its outstanding features, and it’s fully declarative, with the capability to implement complicated transitions in the XML. It is backward-compatible with API level 14, which means it covers 99% of use cases.
+`MotionLayout` 是 `ConstraintLayout` 的子类，继承了父类的所有的优秀功能，并且是完全声明性的，而且能够在 XML 中实现复杂的转换。它从 API 14 开始向后兼容，也就是说它兼容了 99％ 的应用。
 
-The new `MotionLayout` editor in Android Studio 4.0 makes it easy to work with `MotionLayout`. It provides a fancy environment to implement transitions, `MotionScenes`, and more.
+Android Studio 4.0 中新增加的 `MotionLayout` 编辑器让我们方便的使用 `MotionLayout`。它提供了一个很好的场景来实现过渡，比如 `MotionScenes` 等。
 
-To learn more about `MotionLayout`, read this [article](https://medium.com/better-programming/beginners-guide-to-motion-layout-732395a7de7e).
+要了解有关 `MotionLayout` 的更多信息，请阅读此[文章](https://medium.com/better-programming/beginners-guide-to-motion-layout-732395a7de7e)。
 
----
+------
 
-That is all for now, hope you learned something useful, thanks for reading.
+到此为止，希望你学到一些有用的东西，感谢阅读。
 
 > 如果发现译文存在错误或其他需要改进的地方，欢迎到 [掘金翻译计划](https://github.com/xitu/gold-miner) 对译文进行修改并 PR，也可获得相应奖励积分。文章开头的 **本文永久链接** 即为本文在 GitHub 上的 MarkDown 链接。
 
----
+------
 
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