Android中的GoogleApiClient已被弃用，不再支持新的API。相反，Google推荐使用新的GoogleSignInClient或GoogleSignInOptions来实现相同的功能。

以下是一个示例代码，展示如何使用GoogleSignInClient来获取建议联系人列表：

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.tasks.Task;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.TaskCompletionSource;
import com.google.android.gms.tasks.Tasks;
import com.google.android.gms.people.People;
import com.google.android.gms.people.PeopleClient;
import com.google.android.gms.people.PeopleConstants;
import com.google.android.gms.people.PeopleOptions;
import com.google.android.gms.people.model.AutocompleteBuffer;
import com.google.android.gms.people.model.AutocompleteEntry;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    private static final int RC_SIGN_IN = 9001;

    private GoogleSignInClient mGoogleSignInClient;
    private TaskCompletionSource mTaskCompletionSource;
    private PeopleClient mPeopleClient;

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

        // 配置Google登录选项
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .requestScopes(new Scope(PeopleConstants.API_URL))
                .build();
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

        // 设置Google登录按钮
        SignInButton signInButton = findViewById(R.id.sign_in_button);
        signInButton.setOnClickListener(view -> signIn());

        // 初始化People API客户端
        PeopleOptions.Builder optionsBuilder = PeopleOptions.builder();
        mPeopleClient = People.getClient(this, optionsBuilder.build());
    }

    @Override
    protected void onStart() {
        super.onStart();

        // 检查用户是否已经登录
        GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);
        if (account != null) {
            // 用户已登录，执行相关操作
            handleSignInResult(Tasks.forResult(account));
        }
    }

    private void signIn() {
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }

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

        if (requestCode == RC_SIGN_IN) {
            Task task = GoogleSignIn.getSignedInAccountFromIntent(data);
            handleSignInResult(task);
        }
    }

    private void handleSignInResult(Task completedTask) {
        try {
            GoogleSignInAccount account = completedTask.getResult(ApiException.class);
            if (account != null) {
                // 在成功登录后获取建议联系人列表
                getAutocompleteContacts();
            }
        } catch (ApiException e) {
            Log.w(TAG, "signInResult:failed code=" + e.getStatusCode());
            Toast.makeText(MainActivity.this, "登录失败", Toast.LENGTH_SHORT).show();
        }
    }

    private void getAutocompleteContacts() {
        mPeopleClient.autocompleteContacts("",
                PeopleConstants.AUTOCOMPLETE_CONTACT_TYPE_GIVEN_NAME)
                .addOnSuccessListener(this,
                        (OnSuccessListener) buffer -> {
                            for (AutocompleteEntry entry : buffer) {
                                // 处理建议联系人列表
                                Log.d(TAG, "Autocomplete contact: " + entry.getDisplayName());
                            }
                            buffer.release();
                        })
                .addOnFailureListener(this, e ->
                        Log.e(TAG, "Failed to get autocomplete contacts", e));
    }
}

上述代码中，我们首先使用GoogleSignInOptions配置Google登录选项，然后使用该选项来构建GoogleSignInClient实例。在onStart方法中，我们检查用户是否已经登录，如果已经登录则执行相关操作。

当用户点击登录按钮时，我们调用signIn方法启动登录流程。在onActivityResult方法中，我们处理登录结果