要获取Android应用内购买订单详情，可以使用Google Play Billing Library提供的接口和方法。下面是一个示例代码，演示了如何获取应用内购买订单详情。

首先，确保在build.gradle文件中添加Google Play Billing Library依赖项：

implementation 'com.android.billingclient:billing:4.0.0'

接下来，在你的Activity或Fragment中，初始化BillingClient并连接到Google Play：

import com.android.billingclient.api.BillingClient;
import com.android.billingclient.api.BillingClientStateListener;
import com.android.billingclient.api.BillingResult;
import com.android.billingclient.api.Purchase;
import com.android.billingclient.api.PurchaseHistoryResponseListener;
import com.android.billingclient.api.PurchaseHistoryRecord;
import com.android.billingclient.api.PurchasesUpdatedListener;
import com.android.billingclient.api.SkuDetails;
import com.android.billingclient.api.SkuDetailsParams;
import com.android.billingclient.api.SkuDetailsResponseListener;

public class MainActivity extends AppCompatActivity implements PurchasesUpdatedListener {
    private BillingClient billingClient;

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

        billingClient = BillingClient.newBuilder(this)
                .enablePendingPurchases()
                .setListener(this)
                .build();

        billingClient.startConnection(new BillingClientStateListener() {
            @Override
            public void onBillingSetupFinished(BillingResult billingResult) {
                if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
                    // Billing client is ready
                    // Now you can query purchases or make purchases
                    queryPurchaseHistory();
                }
            }

            @Override
            public void onBillingServiceDisconnected() {
                // Billing client disconnected
            }
        });
    }

    @Override
    public void onPurchasesUpdated(BillingResult billingResult, List purchases) {
        if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK && purchases != null) {
            // Handle the purchases
        } else if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.USER_CANCELED) {
            // Handle user cancellation
        } else {
            // Handle other errors
        }
    }

    private void queryPurchaseHistory() {
        billingClient.queryPurchaseHistoryAsync(BillingClient.SkuType.INAPP, new PurchaseHistoryResponseListener() {
            @Override
            public void onPurchaseHistoryResponse(BillingResult billingResult, List purchasesList) {
                if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK && purchasesList != null) {
                    // Handle the purchase history
                    for (PurchaseHistoryRecord purchase : purchasesList) {
                        String purchaseToken = purchase.getPurchaseToken();
                        // Use purchase token to get order details
                        // You can use purchase.getOriginalJson() to get the original JSON string of the purchase
                    }
                }
            }
        });
    }
}

在上面的代码中，我们首先创建一个BillingClient实例，并在连接成功后查询购买历史记录。查询购买历史记录时，我们使用queryPurchaseHistoryAsync()方法，并通过PurchaseHistoryResponseListener监听器处理结果。

在onPurchaseHistoryResponse()方法中，我们可以遍历purchasesList获取每个订单的详细信息，例如购买令牌（purchase token）。你可以使用购买令牌来获取订单的其他信息，例如订单ID或购买日期。

请注意，以上代码仅展示了获取应用内购买订单详情的基本流程。根据你的实际需求，你可能需要进一步处理购买历史记录或使用其他BillingClient提供的功能。