Easy Maps Apps in Java and Python Google Developers English Chinese (Simplified)

Easy Maps Apps in Java and PythonYouTube↗ IA↗(long shot)
Science & Technology 30.5K views 238 likes 8 dislikes 07 Jan 2015

Google for Developers 2.7M subscribers United States YouTube↗

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ALEX DANILO: Hi. As a developer, I know my time is precious.

作为一个开发者我知道我的时间是宝贵的

And, of course, time is money.

一寸光阴一寸金嘛

And time to market is even more important.

并且产品上市的时间更为重要

So when I start building apps, the first thing I do

所以当我开始构建一个应用程序的时候

is look around for some kind of library

我第一件要做的事情就是去

to speed up my development.

找到一些类库来提升开发速度

I'm Alex Danilo, and I'm going to introduce you

我是Alex Danilo 我将向你介绍

to some great libraries that we've built for the Maps APIs.

Google地图API中的一些非常强大的类库

Now with Google Maps, and all the associated APIs,

现在有了Google地图以及相关API

you can build rich applications that

您可以建立一个功能非常丰富的应用程序

take advantage of location-based services

把基于地理位置的服务(LBS)模块

which brings all sorts of functionality into your app.

集成到您的应用程序中

But of course, trying to do that quickly is daunting.

但是当你尝试这样做的时候很快就会令人望而生畏

So we've built a bunch of client libraries

我们为很多客户端做了类库

to make your job easier.

让你的工作更轻松

These libraries are built to support

这些库原生支持

server-side applications developed in Java and Python.

Java和Python语言开发的服务器端

So what they do is provide access to some of our existing

因此他们所做的是使用我们现有的API的接口

APIs, like the Directions API, the Distance Matrix API,

比如Directions API, the Distance Matrix API

the Elevation API, the Geocoding API, and the Time Zone API.

the Elevation API, the Geocoding API和the Time Zone API

And it makes your life simple.

这些API接口让你的开发更简单

See, normally, when you include maps

通常情况是这样的当你在某些应用程序下

in some kind of application, you interface

需要使用Google Maps时则你需要实现

using a protocol that uses REST principles which gives you

服务器端提供的RESTful架构

a stateless interface to the server somewhere.

状态无关(stateless)的接口

But of course, if you prefer to develop in different languages,

当然如果你更倾向于使用不同的语言去开发

like Java or Python, we know that job is really hard.

例如Java或Python 那这工作量就大了

So what we've done is we've built client libraries that

我们已经为你做好了不同客户端的类库帮助你

connect to those services for you,

建立与这些服务之间的连接

and provide an interface in your natural language.

并且提供相关语言的接口

So you don't have to speak gobbledygook or translate Java

所以你不必把Java接口转换为JavaScript接口

to JavaScript, or have some kind of bridge connection.

或者其他接口之间的互相关联等

Now there are a few advantages of this approach.

现在有这种方法的以下几个优点

One is that we've built it and tested it,

一是我们已经帮你做好并测试通过

so you know it's going to work.

你知道它是一定可行的

But two, it cuts down the lines of code.

二是它减少了代码量

Like this is the size of the code

这个就是实际的编码量

you'll need to write to actually connect.

你只需要处理实际的业务即可

Now the beauty of this is that, having built this nice client

现在这样做的美妙之处在于已经建立的这非常棒的

library in API, it gives you a simple interface to work with.

客户端库的API 它会给你一个简单的接口来工作

And not only that, it takes care of authentication and keys,

不仅如此它会处理认证和秘钥

and things like that which can make application

如果有这样的模块你的应用程序

development a little bit complicated.

的开发可能会有点复杂

But one of the nicest features that I like is Retry.

但我最喜欢的功能之一就是重试(Retry)

What this does is, when the server maybe

重试所做的是当服务器可能

has some kind of intermittent failure or flaky network

出现了间歇性故障或者是极不稳定的网络连接

connection or something like that,

或者是类似的情况

especially on mobile networks, it

特别是在移动网络

will take care of all of that transparently so you

它会直接忽略

do no work at all.

什么都不会发生

That's fantastic just on its own.

这简直棒极了

Another thing that a lot of people probably like

有很多人可能喜欢的另一件事是速率限制

is Rate Limiting. So what this does is throttle the connections to the server

所以它所做的是限制了到服务器的连接

so that you won't run into errors caused

这样你就不会碰上造成超出您的

by exceeding your quota limits.

配额限制的错误

The library will let you query as fast as you're allowed,

这个类库可以按照你设定的速率查询

which frees your application from dealing

从而让应用程序避免

with any errors caused by exceeding your quota.

任何超出配额而导致的错误

Probably the single most important thing

也许最重要的事情是

to think about when integrating these client libraries

在整合这些类库到你工程里的时候

is that you're dealing with native objects.

你实际上是在处理本地对象

So if you're working with Java, you'd

所以如果你正在使用Java

actually get a Java object that you manipulate.

你会真正的去操控一个Java对象

So the methods manipulate the Java object directly.

所以调用方法直接操作Java对象

Python is already easy.

Python已经很简单了

But we save you from having to craft and process the response

为了节省时间就不需要处理

and pass it back directly.

直接返回即可

So you don't have to spend time forming URLs or passing

所以你不必花时间去组建一个URL地址或

through JSON results, which saves you from manually setting

通过JSON传输将结果这样可以节省你

up model mapping.

手动设置模型映射的时间

Another bonus is that, if you're using the Java library,

另一个好处是如果你使用Java的库

it lets you connect asynchronously or

它可以让你进行同步或异步连接

synchronously. It's your choice how you want to run the connection.

要如何运行连接这便是你的选择了

And best of all, this entire client library set

最重要的是这整个客户端库集是开源的

is open source. So you can modify it or contribute if you like.

所以如果你喜欢可以修改它或做出你自己的贡献

To find out more, head over to our documentation at this URL.

要了解更多的信息跳转到我们这个URL的文档

You can also load the source code for either Java or Python

您也可以从这里我们的Github资源库查看

from our GitHub repository right here.

Java和Python的源代码

We'd love to see the apps you build.

我们很乐意看到你构建的应用程序

And we'd love you to tell us which languages you

并且我们很想让你告之想要让我们随后支持

want us to support next.

I'm Alex Danilo for the Google Developer Platform Team.

我是来自Google开发者平台团队的Alex Danilo

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