主要参考了这篇文章：

Unity与Android交互方案优化版

链接：https://www.jianshu.com/p/86b275da600e

自己的实现(unity获取内存和温度)：

android端：

 package com.jing.unity;

 import android.app.Activity;

 import android.app.ActivityManager;

 import android.content.BroadcastReceiver;

 import android.content.Context;

 import android.content.Intent;

 import android.content.IntentFilter;

 import android.hardware.Sensor;

 import android.hardware.SensorEvent;

 import android.hardware.SensorEventListener;

 import android.hardware.SensorManager;

 import android.os.Debug;

 // 当前电池温度

 import static android.os.BatteryManager.EXTRA_TEMPERATURE;

 /**

  * Created by Jing on 2018-1-18.

  */

 public class Unity2Android {

     /**

      * unity项目启动时的的上下文

      */

     private Activity _unityActivity=null;

     private SensorManager mSensorManager = null;

     private Sensor mSensor = null;

     ActivityManager mActivityManager=null;

     private float temperature = 0;

     private float memory=0;

     /**

      * 获取unity项目的上下文

      *

      * @return

      */

     public void Init() {

         if (_unityActivity == null) {

             try {

                 Class<?> classtype = Class.forName("com.unity3d.player.UnityPlayer");

                 Activity activity = (Activity) classtype.getDeclaredField("currentActivity").get(classtype);

                 _unityActivity = activity;

             } catch (ClassNotFoundException e) {

             } catch (IllegalAccessException e) {

             } catch (NoSuchFieldException e) {

             }

         }

         mActivityManager = (ActivityManager) _unityActivity.getSystemService(Context.ACTIVITY_SERVICE);

         /*获取系统服务（SENSOR_SERVICE）返回一个SensorManager对象*/

         mSensorManager = (SensorManager) _unityActivity.getSystemService(Context.SENSOR_SERVICE);

         /*通过SensorManager获取相应的（温度传感器）Sensor类型对象*/

         mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE);

         if (mSensor != null) {

             mSensorManager.registerListener(mSensorEventListener, mSensor

                     , SensorManager.SENSOR_DELAY_NORMAL);

         }

         else

         {

             startBroadCast();

         }

     }

     public void Destroy() {

         if (mSensor != null) {

             mSensorManager.unregisterListener(mSensorEventListener, mSensor);

         }

         else

         {

             stopBroadCast();

         }

     }

     private void startBroadCast() {

         IntentFilter filter = new IntentFilter();

         filter.addAction(Intent.ACTION_BATTERY_CHANGED);

         _unityActivity.registerReceiver(mBroadcastReceiver, filter);

     }

     private void stopBroadCast() {

         _unityActivity.unregisterReceiver(mBroadcastReceiver);

     }

     /*声明一个SensorEventListener对象用于侦听Sensor事件，并重载onSensorChanged方法*/

     private final SensorEventListener mSensorEventListener = new SensorEventListener() {

         @Override

         public void onSensorChanged(SensorEvent event) {

             if (event.sensor.getType() == Sensor.TYPE_AMBIENT_TEMPERATURE) {

                 /*温度传感器返回当前的温度，单位是摄氏度（°C）。*/

                 temperature = event.values[0];

             }

         }

         @Override

         public void onAccuracyChanged(Sensor sensor, int accuracy) {

             // TODO Auto-generated method stub

         }

     };

     public float GetTemperature() {

         return temperature;

     }

     public float GetMemory() {

         try {

             int pid = android.os.Process.myPid();

             Debug.MemoryInfo[] memoryInfoArray = mActivityManager.getProcessMemoryInfo(new int[]{pid});

             memory = (float) memoryInfoArray[0].getTotalPss()/ 1024.0f;

         } catch (Exception e) {

         }

         return memory;

     }

     private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {

         @Override

         public void onReceive(Context context, Intent intent) {

             if (null == intent) {

                 return;

             }

             String action = intent.getAction();

             if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {

                 temperature = intent.getIntExtra(EXTRA_TEMPERATURE, -1)/10.0f;

             }

         }

     };

 }

unity端：

 using System.Collections;

 using System.Collections.Generic;

 using UnityEngine;

 public class ShowGUI : MonoBehaviour {

     private float memory=0;

     private float temperature=0;

     private AndroidJavaObject jo;

     // Use this for initialization

     void Start () {

         jo = new AndroidJavaObject("com.jing.unity.Unity2Android");

         jo.Call("Init");//初始化监听

     }

     float GetMemory()

     {

         float m=jo.Call<float>("GetMemory");

         return m;

     }

     float GetTemperature()

     {

         float m=jo.Call<float>("GetTemperature");

         return m;

     }

     void OnDestroy()

     {

         jo.Call("Destroy");//结束监听

     }

     void OnGUI()

     {

         GUIStyle labStyle=new GUIStyle();

         labStyle.fontSize=100;

         labStyle.normal.textColor=Color.red;

         if(GUILayout.Button("获取当前值",GUILayout.MaxWidth(200),GUILayout.MaxHeight(100)))

         {

             memory=GetMemory();

             temperature=GetTemperature();

         }

         GUILayout.Label("memory="+memory.ToString(),labStyle);

         GUILayout.Label("temperature="+temperature.ToString(),labStyle);

     }

 }

值得注意的一点，导出的arr包得改一下sdk的 min version和target version,与unity统一，不然会报错。

如果想导出jar包，打开该类库下的build.gradle,在dependencies后添加以下代码

task makeJar(type:Copy) {

    delete 'build/outputs/test.jar'

    from('build/intermediates/intermediate-jars/release/')//jar文件来源，这个吧我坑的，早期版本是'build/intermediates/bundles/release/'

    into('build/libs/')   //生成路径

    include('classes.jar')

    rename('classes.jar','test.jar')  //命名为test.jar

}

makeJar.dependsOn(build)

然后View-ToolWindow-Gradle，点左上同步，然后拉到other->makeJar即可

巴特西

Unity与Android交互实现

主要参考了这篇文章：

Unity与Android交互方案优化版

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