Plugin For Unity

1. Plugin

2. What is Plugin?
• Libraries of native code written in C, C++,
Objective-C,….etc
• Allow your game code to call functions from
these libraries

3. Why do you need to
develop a Plugin?
• Unity3D can’t Do That
• Reuse C/C++/Objective-C components
• Difficult customize in Unity3D Assets Store
• Cross-Device
• Cross-Platform
• Security Issues

4. Plugins for Different Device
• iOS
#if UNITY_IOS
#else
#endif
if (Application.platform == RuntimePlatform.IPhonePlayer)
• Android
#if UNITY_ANDROID
#else
#endif
if (Application.platform == RuntimePlatform.Android)

5. iOS Plugins
• C/C++ Native Functions in xxx.mm
extern “C”{
float ReturnFloat()
{ return 10.5; }
}
• C# Dll Import
using System.Runtime.InteropServices;
[DllImport("__Internal")]
public static extern float ReturnFloat();

6. iOS Plugins
• C/C++ Native Functions in xxx.h
void UnitySendMessage(const char* obj, const char* method, const
char* msg);
• C/C++ Native Functions in xxx.mm
extern “C”{
void UnityMessage(char* obj, char* function, char* message){
UnitySendMessage(obj, function, message);}
}
• C# Dll Import
using System.Runtime.InteropServices;
[DllImport("__Internal")]
public static extern float UnityMessage(string obj, string function, string
message);

7. Android Plugins
• C/C++ Native Functions in xxx.mm
extern “C”{
float ReturnFloat()
{ return 10.5; }
}
• C# Dll Import
using System.Runtime.InteropServices;
[DllImport("__Internal")]
public static extern float ReturnFloat();

8. Android Plugins
• Jave Class
public class PlugInBridge{
public static float ReturnFloat()
{ return 10.5f; }
}
• C#
AndroidJNI.AttachCurrentThread();
AndroidJavaClass androidClass = new AndroidJavaClass
("com.example.unityplugin.PlugInBridge");
Debug.Log(androidClass.CallStatic< float >(“ReturnFloat"));

9. Android Plugins
• Overwrite onActivityResult
public class FTUnityPlayerActivity extends UnityPlayerActivity
{
public void onActivityResult(int requestCode, int resultCode,
Intent data)
{
Log.d("FTUnityPlayerActivity", "onActivityResult:
requestCode: " + requestCode + ", resultCode:" + resultCode);
}
}

10. Android Plugins
• Modify your Manifest.xml Automatically
<activity
android:name="com.example.unityplugin.FTUnityPlayerActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>