Unityで使えるAndroidの指紋認証プラグイン作ってみた

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace FingerAuth {

    public class FingerManager : MonoBehaviour {

        private const string JAVA_CLASS_NAME = "com.example.fingerauthunity.lib.FingerAuth";
        //Androidプラグインからコールバックを受け取るため
        private const string OBJECT_NAME = "FingerManager"; 

        private FingerAuthState _state;

        public FingerAuthState State { get { return _state; } }

        // Use this for initialization
        void Start () {
            _state = FingerAuthState.INIT;
            gameObject.name = OBJECT_NAME;
            FingerAuthStart();
        }

        // Update is called once per frame
        void Update () {

        }
        public void FingerAuthStart() {
            using (AndroidJavaClass plugin = new AndroidJavaClass(JAVA_CLASS_NAME)) {
                plugin.CallStatic("AuthStart");
            }
        }

        //CallBackで処理結果が返ってくる
        public void FingerAuthResult(string message) {
            _state = (FingerAuthState)int.Parse(message);
        }
    }


    public enum FingerAuthState {
        INIT = -1,
        WAIT = 0,
        SUCCESS = 1,
        FAILD = 2
    }

}

package com.example.fingerauthunity.lib;

import android.annotation.TargetApi;
import android.app.Activity;
import android.hardware.fingerprint.FingerprintManager;
import android.os.Build;
import android.os.CancellationSignal;
import android.os.Handler;
import android.util.Log;

import com.unity3d.player.UnityPlayer;

import static android.content.Context.FINGERPRINT_SERVICE;

public class FingerAuth {

    private static CancellationSignal cancel;

    @TargetApi(Build.VERSION_CODES.M)
    public static void AuthStart() {
        UnityPlayer.UnitySendMessage("FingerManager", "FingerAuthResult", "0");
        final Activity activity = UnityPlayer.currentActivity;
        FingerprintManager fingerprintManager = (FingerprintManager) activity.getSystemService(FINGERPRINT_SERVICE);
        cancel = new CancellationSignal();
        fingerprintManager.authenticate(null, cancel, 0, new FingerprintManager.AuthenticationCallback() {
            @Override
            public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
                UnityPlayer.UnitySendMessage("FingerManager", "FingerAuthResult", "1");
                cancel.cancel();
                Log.i("", "auth success");
            }

            @Override
            public void onAuthenticationFailed() {
                UnityPlayer.UnitySendMessage("FingerManager", "FingerAuthResult", "2");
                cancel.cancel();
                Log.e("", "failed");
            }
            /*
            @Override
            public void onAuthenticationError(int errorCode, CharSequence errString) {
                UnityPlayer.UnitySendMessage("FingerManager", "FingerAuthResult", "3");
                cancel.cancel();
                Log.e("", "error " + errorCode + " " + errString);
            }
            */
        }, new Handler());
    }
}