Building Android plugin for Unity part 2

Ok, On part 1 is how we can use Unity to call android native to do stuff, on part 2 we want to use android native to call Unity to do stuff, to do that, we must first get the Unity classes.jar and put it into our android studio lib folder

So the location of Unity classes.jar file is located on Application-> Unity->PlaybackEngines->AndroidPlayer->Variations->mono-> classes-> classes.jar

Then you should copy the jar file into your AndroidStudioProjects->YOURPROJECTNAME->YOURPLUGINNAME->libs

Now that you have done that you can go to your android studio and make sure inside your build.gradle file under your plugin folder have this

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

then you can modify your plugin1class.java like below

package com.example.plugin1lib;

import android.util.Log;
import com.unity3d.player.UnityPlayer;
public class plugin1class {

public void mylog()
{
        Log.d("Unity","this is calling from native");

        UnityPlayer.UnitySendMessage("mainscript","change_to_a","from android");
    }

So inside your unity, you can create an empty object called "mainscript", attach a C# script into it, inside your C# script you can have a function call "change_to_a" which accept a string parameter, so when everything is successful, you can now calling Unity using this function

"UnityPlayer.UnitySendMessage"

 

So what if you want to call other java plugin to do stuff? You can then copy and paste all the .aar file or .jar file into your Unity folder->Assets->Plugins->Android and you can import their classes and call their function example like below

import com.meetone.meetlib.MeetOneCallBack;
import com.meetone.meetlib.MeetOneManager;
import com.meetone.meetlib.been.AppInfo;
import com.meetone.meetlib.been.Authorize;
import com.meetone.meetlib.been.CallBack;
import com.meetone.meetlib.been.Signature;
import com.meetone.meetlib.been.Transfer;
import com.meetone.meetlib.been.Transaction;

public void testAuthorize() {

Log.d("Unity","ahahahahahaha this is native 3");

    MeetOneManager.getInstance().setDebugMode(true);
    AppInfo appInfo = new AppInfo();
    appInfo.setName("moreone");
    appInfo.setIcon("app icon");
    appInfo.setDappCallbackScheme("moreone");
    //appInfo.setDappRedirectURL("http://www.baidu.com");
    appInfo.setDescription("this is a demo");
    appInfo.setVersion("2.4.0");
    appInfo.setUuID(getUUID(UnityPlayer.currentActivity.getApplicationContext()));

    Authorize authorize = new Authorize();
    authorize.setDescription("memo");
    MeetOneManager.getInstance().requestAuthorize(UnityPlayer.currentActivity.getApplicationContext(), authorize, appInfo, new MeetOneCallBack() {
        @Override
        public void callBack(Map<String, Object> paramMap, CallBack callBack) {
            //Log.d("MeetOneManager", paramMap.toString());
            Log.d("MeetOneManager",paramMap.toString()+"  "+callBack.getData());
            UnityPlayer.UnitySendMessage("mainscript","change_to_a",callBack.getData()+"");
        }
    });
}

So here I copy paste the meetone .aar file into my Unity, then inside my plugin1class.java i can import them and use them like above example, so basically you can have as many plugin as you want all dump into your Unityproject->Assets->plugins->Android folder and you can use all of them

One last thing is the plugin that you build will not include AndroidManifest.xml file so you must include your AndroidManifest.xml file inside your Unityproject->Assets->plugins->Android folder as well, so you can control all the activity within it such as

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.plugin1lib">

<application>


    <activity android:name="com.unity3d.player.UnityPlayerActivity"
android:label="@String/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />



</intent-filter>
<meta-data android:name="unityplayer.UnityActivity" android:value="true" />
</activity>


    <activity android:name="com.meetone.meetlib.RouterActivity"
        android:screenOrientation="portrait"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.VIEW" />

            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />

            <data android:scheme="moreone" />
        </intent-filter>
    </activity>


</application>

</manifest>

Thats all for now, thanks for reading

<br /><center><hr/><em>Posted from my blog with <a href='https://wordpress.org/plugins/steempress/'>SteemPress</a> : http://fundurian.vornix.blog/2019/01/11/building-android-plugin-for-unity-part-2/ </em><hr/></center>