【Failed resolution of: Landroidx/appcompat/app/AppCompatActivity】の解決方法について

Question

前提・実現したいこと

I want to create a biometric plugin in AndroidStudio and connect it with Unity to check it on the actual device.
AndroidStudioで生体認証プラグインを作成し、Unityと接続して実機で確認したいと考えています。

I want to solve the error and make biometric authentication work on the actual device.
このエラーを解決して、実機で生体認証を動作させたい。

I've added the missing libraries and other research as far as I can tell, but I can't figure it out, so please help me out!
足りていないライブラリ等自分がわかる範囲で調査追加しましたが、調べてもわからないのでお力をお貸しください

発生している問題・エラーメッセージ

java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/appcompat/app/AppCompatActivity
java.lang.ClassNotFoundException: androidx.appcompat.app.AppCompatActivity

該当のソースコード

plugins {
    id 'com.android.library'
}

android {
    compileSdkVersion 31

    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        consumerProguardFiles "consumer-rules.pro"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.3.0'
    implementation 'com.google.android.material:material:1.3.0'
    implementation 'androidx.biometric:biometric:1.1.0'

    implementation "androidx.activity:activity:1.2.3"
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

package com.example.biometricslibs;

import android.content.Context;
import androidx.appcompat.app.AppCompatActivity;
import androidx.annotation.NonNull;
import androidx.biometric.BiometricPrompt;
import androidx.core.content.ContextCompat;
import java.util.concurrent.Executor;

public class MainActivity extends AppCompatActivity{
    public static MainActivity instance() {
        return new MainActivity();
    }

    private BiometricPrompt biometricPrompt;

    private BiometricPrompt.AuthenticationCallback callback = new BiometricPrompt.AuthenticationCallback() {
        @Override
        public void onAuthenticationError(int errorCode, @NonNull CharSequence errString) {
            super.onAuthenticationError(errorCode, errString);
            if (errorCode == 13 && biometricPrompt != null)
                biometricPrompt.cancelAuthentication();
        }

        @Override
        public void onAuthenticationSucceeded(@NonNull BiometricPrompt.AuthenticationResult result) {
            super.onAuthenticationSucceeded(result);
        }

        @Override
        public void onAuthenticationFailed() {
            super.onAuthenticationFailed();
        }
    };

    public void BiometricCheck(Context context) {
        BiometricPrompt.PromptInfo promptInfo = new BiometricPrompt.PromptInfo.Builder()
                .setTitle("title")
                .setSubtitle("subTitle")
                .setDescription("description")
                .setNegativeButtonText("cancel")
                .build();

        Executor executor = ContextCompat.getMainExecutor(context);
        biometricPrompt = new BiometricPrompt((AppCompatActivity)context, executor, callback);

        biometricPrompt.authenticate(promptInfo);
    }
}

using(var nativeDialog = new AndroidJavaClass("com.example.biometricslibs.MainActivity"))
{
    using(var unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
    {
        using(var currentUnityActivity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity"))
        {
            using(var instance = nativeDialog.CallStatic<AndroidJavaObject>("instance"))
            {
                instance.Call(
                    "BiometricCheck",
                    currentUnityActivity
                );
            }
        }
    }
}

補足情報（FW/ツールのバージョンなど）

Unity2019.2.21f1
Android Studio Arctic Fox | 2020.3.1

Answer 1

mainTemp;ate.gradleに

    implementation  'androidx.appcompat:appcompat:1.3.1'
    implementation  'androidx.biometric:biometric:1.1.0'

を追加してあげれば処理が通ることができた