在Android中，应用内订阅默认情况下是不会自动续订的。如果你需要实现自动续订的功能，你可以使用Google Play Billing Library提供的相关方法来实现。下面是一个示例代码：

// 导入相关库
import com.android.billingclient.api.BillingClient;
import com.android.billingclient.api.BillingClientBuilder;
import com.android.billingclient.api.BillingClientStateListener;
import com.android.billingclient.api.Purchase;
import com.android.billingclient.api.PurchasesUpdatedListener;
import com.android.billingclient.api.BillingResult;
import com.android.billingclient.api.BillingFlowParams;
import com.android.billingclient.api.BillingClient.SkuType;
import com.android.billingclient.api.SkuDetails;
import com.android.billingclient.api.SkuDetailsParams;
import com.android.billingclient.api.SkuDetailsResponseListener;
import com.android.billingclient.api.Purchase.PurchasesResult;

// 创建 BillingClient 对象
BillingClient billingClient = BillingClientBuilder.newBuilder(context)
        .setListener(new PurchasesUpdatedListener() {
            @Override
            public void onPurchasesUpdated(BillingResult billingResult, List purchases) {
                // 处理购买结果和相关逻辑
                if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK && purchases != null) {
                    for (Purchase purchase : purchases) {
                        handlePurchase(purchase);
                    }
                }
            }
        })
        .build();

// 建立与 Google Play Billing 服务的连接
billingClient.startConnection(new BillingClientStateListener() {
    @Override
    public void onBillingSetupFinished(BillingResult billingResult) {
        if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
            // 查询订阅详情
            List skuList = new ArrayList<>();
            skuList.add("your_subscription_sku"); // 订阅的 SKU
            SkuDetailsParams.Builder params = SkuDetailsParams.newBuilder();
            params.setSkusList(skuList).setType(SkuType.SUBS); // 设置类型为订阅
            billingClient.querySkuDetailsAsync(params.build(), new SkuDetailsResponseListener() {
                @Override
                public void onSkuDetailsResponse(BillingResult billingResult, List skuDetailsList) {
                    if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK && skuDetailsList != null) {
                        for (SkuDetails skuDetails : skuDetailsList) {
                            String sku = skuDetails.getSku();
                            String price = skuDetails.getPrice();
                            // 处理订阅详情
                        }
                    }
                }
            });
        }
    }

    @Override
    public void onBillingServiceDisconnected() {
        // 连接断开
    }
});

// 发起购买订阅的流程
String skuId = "your_subscription_sku"; // 订阅的 SKU
BillingFlowParams flowParams = BillingFlowParams.newBuilder()
        .setSku(skuId)
        .setType(SkuType.SUBS) // 设置类型为订阅
        .build();
int responseCode = billingClient.launchBillingFlow(activity, flowParams);
if (responseCode != BillingClient.BillingResponseCode.OK) {
    // 处理错误
}

这是一个简单的示例，你可以根据你的实际需求进行修改和扩展。