blocks|key|2785777|text|这是一个相当主观的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2785778|2785779|+1)开发安卓应用程序哪个更容易、更快？|blockquote|2785780|2785781|2785782|我认为kivy有一个强有力的论据，但这并没有一个客观的答案。|2785783|Kivy对访问|2785784|的某些部分是否有限制(比如没有与其应用程序接口完全集成)？|2785785|2785786|2785787|kivy项目包括pyjnius，一个用于通过python访问java类的工具，原则上我认为这应该提供对java+api的任意访问(编辑:基于反射，而不是任意，但可能不限于立即重要的方式)。|2785788|在实践中，预先构建的python包装器是一项正在进行中的工作，尽管正在迅速改进。android+python库已经提供了对许多东西的简单访问(包括但不限于意图、振动、加速计等)。即使在还没有python包装器的情况下，也可以非常容易地完成必要的工作。|2785789|编辑:最近在Kivy的plyer项目上做了大量的工作，目的是为平台特定的工具提供一个透明的应用程序接口，这样你就可以调用它一次，并在不同的系统上获得相同的行为，而不需要知道细节。它包括对android+api部分的有用支持。|offset|length|2785790|2785791|+3)，最后，使用kivy开发的安卓应用程序的运行速度将与使用java开发的应用程序运行速度一样快？|2785792|2785793|2785794|归根结底，答案可能是否定的，但除非您正在做一些cpu限制很大的事情，否则这种差异不太可能很重要。你建议的任务不会以这种方式受到限制。|2785795|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/kivy/plyer^0|0|0|0|0|0|0|0|0|0|0|0|0|B|5|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1E|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1H|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1I|8|@]|9|@]|A|$]]|$1|L|3|M|5|E|7|1J|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1M|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1N|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1O|8|@]|9|@$V|1P|W|1Q|1|1R]]|A|$]]|$1|X|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|E|7|1T|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|1W|8|@]|9|@]|A|$]]|$1|14|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|1B]]]]

This is a rather subjective question.

<blockquote>
 1) Which one its easier and faster to develop android apps?
</blockquote>

I think there's a strong argument for kivy, but this doesn't have an objective answer.

<blockquote>
 2) Does Kivy has limitations to access certain parts of android (like not fully integrated with its api)?
</blockquote>

The kivy project includes pyjnius, a tool for accessing java classes through python, and in principle I think this should give arbitrary (edit: on reflection, not arbitrary, but probably not limited in immediately important ways) access to the java apis.

In practice, prebuilt python wrappers are a work in progress, though rapidly improving. The android python library already gives easy access to many things (including but not limited to intents, vibration, accelerometer etc.). Even where there isn't already a python wrapper, it can be very easy to do the necessary work.

Edit: There has recently been great work on Kivy's <a href="https://github.com/kivy/plyer">plyer</a> project, intended to provide a transparent api to platform specific tools so that you can call it once and get the same behaviour on different systems without knowing about the details. It includes useful support for parts of the android api.

<blockquote>
 3) And finally, an android app developed using kivy would run as fast as one developed using java?
</blockquote>

Ultimately the answer is probably no, but the difference is highly unlikely to be important unless you're doing something strongly cpu limited. The task you suggest would not be limited in that way.

blocks|key|2785830|text|为了完善克雷门特的回答，pyjnius确实允许访问很多android+api。但这并不完美，调用现有的类并不总是足够的，而且android程序员经常需要创建将被android调用的代码来管理事件，有两种方法可以做到这一点，这两种方法都由android+api使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2785831|2785832|第一个是接口:你需要创建一个实现现有java接口的类，pyjnius可以做到这一点，你创建一个python类并声明它实现了哪个java接口，并有一个装饰器来声明你必须声明的方法。|unordered-list-item|2785833|第二个是子类化，你需要子类化一个现有的java类并覆盖一些方法，而我们还没有办法用pyjnius做到这一点，所以对于这些，你必须创建一个java类并在你的程序中使用它(幸运的是你可以把它和kivy/pyjnius混合在一起，在这种情况下，它不可能是100%25的python+)。|2785834|2785835|因此，有必要事先查看一下api，看看您必须访问的android+api部分是否需要这样做。|2785836|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|P|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

To complete inclement's answer, pyjnius indeed allows to access a lot of the android api. But it's not perfect, calling existing classes is not always enough, and an android programmer often need to create code that will be called by android to manage events, there are two ways to do that, both used by the android api. 

<ul>
<li>The first one is interfaces: you need to create a class that implement an existing java interface, pyjnius can do that, you create a python class and declare which java interface it implements, and have a decorator to declare the methods you have to declare.</li>
<li>The second is subclassing, you need to subclass an existing java class and override some methods, and we don't have a way to do that with pyjnius yet, so for these ones, you'd have to create a java class and use it in your program (fortunately you can mix that with kivy/pyjnius, it's just can't be 100% python in that scenario).</li>
</ul>

So it can be worth a look to the api beforehand, to see if the parts of the android api you have to access requires that.

I'm a python developer with little experience creating android apps in java and want to create an app that will access my university web portal, retrieve some data and show on a view.

So, after researching Kivy, I have a few questions:

1) Which one is easier and faster to develop android apps?

2) Does Kivy have any android feature limitations?

3) And finally, would an android app developed using kivy run as fast as one developed using java?

Difference between Kivy and Java for android apps

我是一个python开发人员，在java中创建android应用程序的经验很少，我想创建一个应用程序，它可以访问我的大学门户网站，检索一些数据并显示在视图上。所以，在研究了Kivy之后，我有几个问题：1)开发安卓应用哪个更容易、更快？2) Kivy有什么安卓功能限制吗？3)，最后，使用kivy开发的安卓应用程序运行速度...

问针对android应用程序的Kivy和Java之间的差异
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