要在Android上实现Active Directory B2C授权，可以按照以下步骤进行操作：

1. 添加依赖：在项目的build.gradle文件中添加以下依赖项：

dependencies {
    implementation 'com.microsoft.identity.client:msal:1.4.0'
}

2. 创建一个AuthenticationHelper类，用于处理授权逻辑。代码示例：

import android.app.Activity;
import android.util.Log;
import com.microsoft.identity.client.AuthenticationCallback;
import com.microsoft.identity.client.AuthenticationResult;
import com.microsoft.identity.client.IAccount;
import com.microsoft.identity.client.IPublicClientApplication;
import com.microsoft.identity.client.PublicClientApplication;

public class AuthenticationHelper {
    private static final String TAG = "AuthenticationHelper";
    private IPublicClientApplication mPublicClientApplication;

    public AuthenticationHelper(Activity activity, String clientId, String authority) {
        try {
            mPublicClientApplication = PublicClientApplication.createSingleAccountPublicClientApplication(activity, clientId, authority);
        } catch (Exception e) {
            Log.e(TAG, "Failed to create PublicClientApplication: " + e.getMessage());
        }
    }

    public void signIn(Activity activity, AuthenticationCallback authenticationCallback) {
        mPublicClientApplication.signIn(activity, null, null, authenticationCallback);
    }

    public void signOut() {
        mPublicClientApplication.signOut();
    }

    public IAccount getAccount() {
        return mPublicClientApplication.getAccount();
    }
}

3. 在你的Activity中使用AuthenticationHelper类来实现授权。代码示例：

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import com.microsoft.identity.client.AuthenticationCallback;
import com.microsoft.identity.client.AuthenticationResult;
import com.microsoft.identity.client.IAccount;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    private static final int REQUEST_CODE_SIGN_IN = 123;

    private AuthenticationHelper mAuthenticationHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mAuthenticationHelper = new AuthenticationHelper(this, "your_client_id", "your_authority");

        findViewById(R.id.btnSignIn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                signIn();
            }
        });

        findViewById(R.id.btnSignOut).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                signOut();
            }
        });
    }

    private void signIn() {
        mAuthenticationHelper.signIn(this, new AuthenticationCallback() {
            @Override
            public void onSuccess(AuthenticationResult authenticationResult) {
                Log.d(TAG, "Sign in success");
            }

            @Override
            public void onError(Exception exception) {
                Log.e(TAG, "Sign in error: " + exception.getMessage());
            }

            @Override
            public void onCancel() {
                Log.d(TAG, "Sign in canceled");
            }
        });
    }

    private void signOut() {
        mAuthenticationHelper.signOut();
        Log.d(TAG, "Sign out success");
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        mAuthenticationHelper.getAccount().onActivityResult(requestCode, resultCode, data);
    }
}

请注意替换代码中的your_client_id和your_authority为你自己的客户端ID和Authority。

这样，你就可以在Android上使用Active Directory B2C进行授权了。