在使用 Google Play In-App Billing V5 订阅功能时，可以使用以下代码示例来实现带有试用期的订阅：

1. 首先，在应用程序级别的 build.gradle 文件中添加以下依赖项：

implementation 'com.android.billingclient:billing:3.0.1'

2. 然后，在订阅类中设置试用期的相关参数，例如：

SkuDetailsParams.Builder params = SkuDetailsParams.newBuilder(); params.setSkusList(Arrays.asList(sku)) .setType(BillingClient.SkuType.SUBS);

// Add peroid duration to query subscription price String[] signatureNeeded = {"trial_period"}; params.setSkuDetailsExtraParams(new SkuDetails.SkuDetailsParams.Builder() .setIapToken(token).setDeveloperPayload(developerPayload) .setSignatureNeeded(signatureNeeded).build());

3. 接着，在 Activity 中初始化 BillingClient 并启动购买流程：

// Create a new instance of BillingClient and get the client's response listener BillingClient billingClient = BillingClient.newBuilder(context) .setListener(purchasesUpdatedListener) .enablePendingPurchases() .build();

// Call startConnection() to connect to Google Play and initiate the billing flow billingClient.startConnection(new BillingClientStateListener() { @Override public void onBillingSetupFinished(@NonNull BillingResult billingResult) { if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) { // Query for available catalogue items, and then initiate the purchase flow. List skuList = new ArrayList<>(); skuList.add(sku); SkuDetailsParams params = SkuDetailsParams.newBuilder() .setSkusList(skuList).setType(BillingClient.SkuType.SUBS).build(); billingClient.querySkuDetailsAsync(params, (billingResult1, skuDetailsList) -> { if (billingResult1.getResponseCode() == BillingClient.BillingResponseCode.OK) { // Start purchase flow... } }); } } });

实现以上代码后，用户在购买订阅时，会