"unity" integration with iOS and Android: 4. Interactive theory with iOS and Android

This article belongs to "unity and iOS, Android platform integration" series of articles , reproduced please indicate the source .

This article focuses on the theoretical basis for unity's interaction with iOS and Android platforms.

0. Preface

C # is used on the unity side

Object-c is used on the iOS side

Java is used on the Android side

You're going to ask me why?

Because I'm happy.

First, the interaction needs

The interaction requirements between code and code are abstracted from the two most basic requirements:

1. Calling functions

2. Passing Data

So we just need to implement these two basic requirements between unity and iOS and Android.

Second, the principle of interaction

First, can we achieve the cornerstone of interaction-call each other?

Fortunately, Unity's active call to iOS and Android is doable, and iOS and Android actively invoke unity as well.

1.Unity active call to iOS, Android

IOS with Unity

Implementation Solutions Unity's official documentation has been given

I made some summaries myself:

First, Unity supports C # by invoking a DLL to invoke C + + 's

Second, iOS is supported by C + + and object-c, so C + + can naturally call Object-c

So, our implementation scenario is C #-C + +-object-c

Android, Unity

Similarly, the official documentation of Unity for the implementation of the solution has been given

Two methods are given in the documentation:

Plan A: How to use the Android NDK

Plan B: How to use Java Native Interface (JNI)

Then I'll explain the JNI approach in Plan B, and why not talk about plan A's way ... Because I'm not happy ...

On the way to the JNI official gave a detailed example, I have also done some summary:

First, Unity provides Unityengine.androidjni, which enables you to create Java objects in C # and Invoke functions

Second, do native Java calls on Android, Java implementation can not be self-hanging southeast branch

So, our implementation scenario is C #-Java

2.iOS, Android active call Unity

Unity, Android, IOS

Unity has only provided us with an official approach.

Unitysendmessage ("GameObjectName1", "MethodName1", "Message to send");

Explain this function:

return value: None

function type: static function, direct call (included in Com.unity3d.player.UnityPlayer in Java)

Parameter 1: Name of a Gameobject object in the scene

Parameter 2: The function name that is mounted on the component on the Gameobject object

Parameter 3: Parameters passed in when the function is called

So, our implementation scenario is java/object-c C #

Second, can you implement parameter passing?

Don't worry, the methods mentioned above can be implemented.

1.Unity pass parameters to iOS and Android

A. Number of parameters

About the number, I have passed the maximum of 9, the upper limit has not been tried, but I also do not recommend too many parameters, simple point good.

B. Types that can be transmitted directly

I did not try all the types, only summed up a few commonly used, if you are interested can try it yourself.

√:bool, int, float, string

x:class, struct

C. Return values after a call

Again, I've only tried some of the usual types.

√:bool, int, float, string

x:class, struct

2.iOS, Android Pass parameters to unity

A. Number of parameters

Only 1

B. Types that can be transmitted directly

can only pass string

C. Return values after a call

No return value

Q: Horizontal slot, how to do this, IOS, Android to Unity can only pass a string Ah!!!!

A: Panic What, Sao years, know what is called JSON?

Yes, all data structures, we can use the JSON format to encapsulate a string into C # and then parse it out.

　　Q: What if there is no return value, I want to return the value Ah!!!

A: callback within the called C # function to pass a parameter is not good ~

Yes, the return value can be given in the form of an immediate callback, as long as it is possible to implement mutual invocation of the arguments, although it is a bit troublesome.

Iii. Summary

As you can see from the above theory, there is a need for interaction between unity and iOS and Android platforms:

1. Calling functions

2. Passing Data

So, the interaction between Unity and iOS and Android is something you can do.

At the same time, the theory of the implementation of the program in the official documents have been given, I hope you have time to try to achieve their own.

The entire interactive implementation process and the source code, I will explain in the next article and provide download, please look forward to ~

"unity" integration with iOS and Android: 4. Interactive theory with iOS and Android