要获取Android OAuth 2.0和OpenID Connect提供者的示例代码，您可以按照以下步骤操作：

1. 使用Android Studio创建一个新的Android项目。

2. 在app级别的build.gradle文件中，添加以下依赖项：

implementation 'com.google.android.gms:play-services-auth:19.0.0'
implementation 'com.squareup.okhttp3:okhttp:4.9.1'
implementation 'com.squareup.okhttp3:logging-interceptor:4.9.1'
implementation 'com.squareup.okhttp3:okhttp-urlconnection:4.9.1'
implementation 'com.squareup.okio:okio:2.9.0'

3. 创建一个新的Java类，例如OAuthUtils.java，并添加以下代码：

import android.content.Context;
import android.net.Uri;
import android.util.Base64;

import com.squareup.okhttp.Interceptor;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import com.squareup.okhttp.logging.HttpLoggingInterceptor;

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

import java.io.IOException;

public class OAuthUtils {
    private static final String AUTHORIZATION_ENDPOINT = "https://your-authorization-endpoint";
    private static final String TOKEN_ENDPOINT = "https://your-token-endpoint";
    private static final String CLIENT_ID = "your-client-id";
    private static final String CLIENT_SECRET = "your-client-secret";
    private static final String REDIRECT_URI = "your-redirect-uri";
    private static final String SCOPE = "your-scope";
    private static final String RESPONSE_TYPE = "code";

    public static String buildAuthorizationUrl() {
        Uri.Builder builder = Uri.parse(AUTHORIZATION_ENDPOINT).buildUpon();
        builder.appendQueryParameter("client_id", CLIENT_ID);
        builder.appendQueryParameter("redirect_uri", REDIRECT_URI);
        builder.appendQueryParameter("response_type", RESPONSE_TYPE);
        builder.appendQueryParameter("scope", SCOPE);
        return builder.build().toString();
    }

    public static String getToken(Context context, String authorizationCode) throws IOException, JSONException {
        OkHttpClient client = new OkHttpClient();

        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

        client.interceptors().add(loggingInterceptor);

        String credentials = CLIENT_ID + ":" + CLIENT_SECRET;
        String basicAuth = "Basic " + Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);

        Request request = new Request.Builder()
                .url(TOKEN_ENDPOINT)
                .addHeader("Authorization", basicAuth)
                .post(new MultipartBuilder()
                        .type(MultipartBuilder.FORM)
                        .addFormDataPart("grant_type", "authorization_code")
                        .addFormDataPart("code", authorizationCode)
                        .addFormDataPart("redirect_uri", REDIRECT_URI)
                        .build())
                .build();

        Response response = client.newCall(request).execute();
        String responseBody = response.body().string();

        JSONObject jsonObject = new JSONObject(responseBody);
        return jsonObject.getString("access_token");
    }
}

4. 在您的Android活动中，例如MainActivity.java，您可以使用以下代码启动OAuth流程：

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    private static final int AUTH_REQUEST_CODE = 100;

    private Button authButton;

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

        authButton = findViewById(R.id.auth_button);
        authButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String authorizationUrl = OAuthUtils.buildAuthorizationUrl();
                Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(authorizationUrl));
                startActivityForResult(intent, AUTH_REQUEST_CODE);
            }
        });
    }

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

        if (requestCode == AUTH_REQUEST_CODE && resultCode == RESULT_OK) {
            String authorizationCode = data.getStringExtra("code");
            getToken(authorizationCode);
        }
    }

    private void getToken(String authorizationCode) {
        new AsyncTask() {
            @Override
            protected String doInBackground(String... params) {
                try {
                    return OAuthUtils.getToken(MainActivity.this, params[0]);
                } catch (IOException | JSONException e) {
                    e.printStackTrace();
                }
                return null;
            }

            @Override
            protected void onPostExecute(String token) {
                super.onPostExecute(token);
                if (token != null) {
                    // 使用访问令牌进行进一