GameHelper

在app——src——main——java——com.DefaultCompany.ResLoadPrg文件夹内新建Java代码文件，并命名为GameHelper

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package com.DefaultCompany.ResLoadPrg;

import android.app.ActivityManager;
import android.content.Context;
import android.util.Log;

import com.unity3d.player.UnityPlayer;

import org.json.JSONException;
import org.json.JSONObject;

public class GameHelper {
    private  static  MainActivity m_Activity = null;
    private  static final String m_PlatformObject = "PlatformObject"; //Unity内用来通信的GO
    private  static final String m_MethodName = "OnMessage";//Unity用于接收通信的方法名称
    public  static  String TAG = "GameHelper";//SDK接入时无法直接调试，只能靠Log
    
    //初始化方法
    public static  void Init(MainActivity activity){
        m_Activity = activity;
    }
    
    public static final int PLATFORM_MSG_QQLOGINCALLBACK = 1;//登录QQ回调
    public static final int PLATFORM_MSG_WXLOGINCALLBACK = 2;//登录微信回调
    //android发送消息到Unity
    public  static  void SendPlatformMessageToUnity(
            int iMsgId,
            int iParam1,
            int iParam2,
            int iParam3,
            String strParam1,
            String strParam2,
            String strParam3){
        String jsonString = GetJsonStr(iMsgId,iParam1,iParam2,iParam3,strParam1,strParam2,strParam3);
        UnityPlayer.UnitySendMessage(m_PlatformObject,m_MethodName,jsonString);
    }

    public static final int PLATFORM_MSG_QQLOGIN = 1;//QQ登录
    public static final int PLATFORM_MSG_QQLOGOUT = 2;//QQ注销
    public static final int PLATFORM_MSG_WXLOGIN = 3;//微信登录
    public static final int PLATFORM_MSG_WXLOGOUT = 4;//微信注销
    //Unity发送消息到Android
    public  static  void SendUnityMessageToPlatform(
            int iMsgId,
            int iParam1,
            int iParam2,
            int iParam3,
            int iParam4,
            String strParam1,
            String strParam2,
            String strParam3,
            String strParam4
    ){

        Log.d(TAG,"SendUnityMessageToPlatform: iMsgId: " + iMsgId + "\n" +
                "iParam1" + iParam1 + "\n" +
                "iParam2" + iParam2 + "\n" +
                "iParam3" + iParam3 + "\n" +
                "iParam4" + iParam4 + "\n" +
                "strParam1" + strParam1 + "\n" +
                "strParam2" + strParam2 + "\n" +
                "strParam3" + strParam3 + "\n" +
                "strParam4" + strParam4);

        if(m_Activity == null)
        {
            Log.e(TAG,"m_Activity is null");
        }
		switch (iMsgId){
            case PLATFORM_MSG_QQLOGIN:
                TencentQQ.Login();
                break;
            case PLATFORM_MSG_QQLOGOUT:
                TencentQQ.Logout();
                break;
            case PLATFORM_MSG_WXLOGIN:
                break;
            case PLATFORM_MSG_WXLOGOUT:
                break;
        }
    }
    //Unity从Android获取int
    public static int GetIntFromPlatform(int type){
        switch (type){

        }
        return 0;
    }
    public static final int PLATFORM_MSG_AUTHORVALID = 1;
    public static final int PLATFORM_MSG_REFRESHSESSION = 2;
    //Unity从Android获取String
    public static String GetStringFromPlatform(int type){
        switch (type){
            case PLATFORM_MSG_AUTHORVALID:
                return String.valueOf(TencentQQ.CheckAuthorValid());
            case PLATFORM_MSG_REFRESHSESSION:
                return TencentQQ.RefreshSession().toString();
        }
        return "";
    }
    //Unity从Android获取long
    public static long GetLongFromPlatform(int type){
        switch (type){
            
        }
        return 0;
    }
    //Unity从Android获取long带参数
    public static long GetLongFromPlatform2(
            int type,
            int iParam1,
            int iParam2,
            int iParam3,
            int iParam4,
            String strParam1,
            String strParam2,
            String strParam3,
            String strParam4
    ){
        switch (type){

        }
        return 0;
    }
    //通过json对象构造字符串
    public static String GetJsonStr(
            int iMsgId,
            int iParam1,
            int iParam2,
            int iParam3,
            String strParam1,
            String strParam2,
            String strParam3){
        try {
            JSONObject object = new JSONObject();
            object.put("iMsgId",iMsgId);
            object.put("iParam1",iParam1);
            object.put("iParam2",iParam2);
            object.put("iParam3",iParam3);
            object.put("strParam1",strParam1);
            object.put("strParam2",strParam2);
            object.put("strParam3",strParam3);
            return object.toString();
        }
        catch (Exception e){
            Log.e(TAG,"Json error" + e.toString());
        }
        return "";
    }
}

Android Studio快速注释快捷键1：CTRL + /

Android Studio快速注释快捷键2：CTRL + SHIFT + /

QQ第一次登录流程调用链：

Unity——SendUnityMessageToPlatform——（在安卓底层）TencentQQ.Login——LoginCallBack——在回调内使用GameHelper.SendPlatformMessageToUnity将统一化的json文件返回给Unity

QQ重复登录流程调用链：

Unity——GetStringFromPlatform——（在安卓底层）TencentQQ.CheckAuthorValid()返回票据是否过期

如果上一步返回的是true，则Unity——GetStringFromPlatform——（在安卓底层）TencentQQ.RefreshSession().toString()返回统一化json文件

在MainActivity初始化GameHelper

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public class MainActivity extends UnityPlayerActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        GameHelper.Init(this);//+++
    }

}

获取安卓系统内存

修改GameHelper的GetLongFromPlatform方法

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//Unity从Android获取long
    public static long GetLongFromPlatform(int type){
        switch (type){
            case 1://获取当前安卓可用内存
                ActivityManager am = (ActivityManager) m_Activity.getSystemService(Context.ACTIVITY_SERVICE);
                ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
                am.getMemoryInfo(mi);
                return mi.availMem;
            case 2://总内存
                return GetTotalMemory();
            case 3://apk运行内存
                Debug.MemoryInfo memoryInfo = new Debug.MemoryInfo();
                Debug.getMemoryInfo(memoryInfo);
                return memoryInfo.getTotalPss() * 1024;

        }
        return 0;
    }
//通过读取内核文件来获取设备的总内存
    protected static long GetTotalMemory(){
        long tm = 0;
        try{
            RandomAccessFile reader = new RandomAccessFile("/proc/meminfo","r");
            String load = reader.readLine();
            reader.close();

            String[] totrm = load.split("kB");
            String[] trm = totrm[0].split("");
            tm = Long.parseLong(trm[trm.length - 1]) * 1024;

        }
        catch (IOException e){
            e.printStackTrace();
        }
        return tm;
    }