unity与java相互调用

首先做一下工程准备，

将unity中关于编译Android程序的Jar包导入我们的项目中，

project - Properties - Java Build Path - Add External JARs...

Jar包路径一般为：

%Unity安装目录%\Editor\DataPlaybackEngines\androidplayer\development\bin\classes.jar

让Java的应用程序继承UnityPlayerNativeActivity，温馨提示：在Eclipes中自动import的快捷键为ctrl+shift+o，

基本秩序保留onCreate函数，然后就是写接口

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}

一般接口分为两种，静态和非静态，

首先说一下静态函数接口的调用，假设我们的java类如下：

package com.Sealy.FingerTest;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.os.Bundle;
import android.view.View;

import com.unity3d.player.UnityPlayer;
import com.Sealy.FingerTest.UnityPlayerNativeActivity;

public class MainActivity extends UnityPlayerNativeActivity{

public static int myAdd(int a,int b)
{
return a+b;
}

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
}

然后打包成jar包，放到unity工程中的Assets\Plugins\Android\bin目录下，注意，如果秩序打包java代码，则只需点击src打包



在unity中，只需

private AndroidJavaClass jc;

jc = new AndroidJavaClass("com.Sealy.FingerTest.MainActivity");

int sum = jc.CallStatic<int>("myAdd",1,3);

搞定，这是最简单的调用类的静态方法，当然我们可以写成非静态方法，将java类写成单例，供外部调用，

package com.Sealy.FingerTest;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.os.Bundle;
import android.view.View;

import com.unity3d.player.UnityPlayer;
import com.Sealy.FingerTest.UnityPlayerNativeActivity;

public class MainActivity extends UnityPlayerNativeActivity{

public static MainActivity currentActivity;

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
jarTestFunc("call onCreate");
currentActivity=this;
}

public static MainActivity getInstance()
{
return currentActivity;
}

public int myAdd(int a,int b)
{
return a+b;
}
}

因为用了单例，单例的实例化在onCreate中，所以必须让类调用onCreate，所以需要在AndroidManifest.xml中配置相应的activity，

例子：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.Sealy.FingerTest" android:theme="@android:style/Theme.NoTitleBar" android:versionName="1.0" android:versionCode="1" android:installLocation="preferExternal">
<supports-screens android:smallScreens="true" android:normalScreens="true" android:largeScreens="true" android:xlargeScreens="true" android:anyDensity="true" />
<application android:icon="@drawable/app_icon" android:label="@string/app_name" android:debuggable="false">
<activity android:name="com.Sealy.FingerTest.MainActivity"
android:label="@string/app_name" android:screenOrientation="fullSensor" android:launchMode="singleTask"
android:configChanges="mcc|mnc|locale|touchscreen|keyboard|keyboardHidden|navigation|orientation|screenLayout|uiMode|screenSize|smallestScreenSize|fontScale" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<category android:name="android.intent.category.LEANBACK_LAUNCHER" />
</intent-filter>
<meta-data android:name="unityplayer.UnityActivity" android:value="true" />
<meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="false" />
</activity>

</application>
<uses-sdk android:minSdkVersion="9" android:targetSdkVersion="19" />
<uses-feature android:glEsVersion="0x00020000" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.touchscreen" android:required="false" />
<uses-feature android:name="android.hardware.touchscreen.multitouch" android:required="false" />
<uses-feature android:name="android.hardware.touchscreen.multitouch.distinct" android:required="false" />
</manifest>

然后把AndroidManifest.xml丢到unity的Assets\Plugins\Android目录下

然后unity调用如下：

private AndroidJavaClass jc;

jc = new AndroidJavaClass("com.Sealy.FingerTest.MainActivity");

AndroidJavaObject ao = jc.CallStatic<AndroidJavaObject>("getInstance");

int sum = ao .Call<int>("myAdd",1,3);

如果不是立即返回的，则可以用
UnityPlayer.UnitySendMessage("GameObjectName", "CallBackFuncName", "param");

将结果返回给unity