1. 先集成google支付插件

	//新旧版版本获取方式跟调起支付方式不同
	//旧版本
 	implementation "com.android.billingclient:billing:4.0.0"
 	//新版本要接入最新的，比如：
 	implementation "com.android.billingclient:billing:6.0.0"

2. 在Application进行初始化连接谷歌，判断是否接通谷歌，只有接通谷歌才能做后面操作

//初始化
BillingClient billingClient = BillingClient.newBuilder(this)
                .setListener(purchasesUpdatedListener)
                .enablePendingPurchases()
                .build();
if (!billingClient.isReady()) {
   billingClient.startConnection(new BillingClientStateListener() {
                @Override
                public void onBillingServiceDisconnected() {
                }
                @Override
                public void onBillingSetupFinished(@NonNull BillingResult billingResult) {
                    if (billingResult.getResponseCode() ==  BillingClient.BillingResponseCode.OK) {
						//这里代表接通谷歌成功
                    }
                }
            });
        }

3.获取谷歌商品信息，获取商品信息，主要分应用内商品，订阅，传入产品id获取数据
BillingClient.SkuType.SUBS 代表订阅商品，BillingClient.SkuType.INAPP，应用内商品，具体看在谷歌后台创建什么商品

//5.0.0以下版本
List<String> skuList = new ArrayList<>();
skuList.add("test1"); //test1 代表产品id,具体产品去后谷歌后台查看id
SkuDetailsParams.Builder params = SkuDetailsParams.newBuilder();
params.setSkusList(skuList).setType(BillingClient.SkuType.SUBS);
//
billingClient.querySkuDetailsAsync(params.build(),new SkuDetailsResponseListener() {
   @Override
  public void onSkuDetailsResponse(BillingResult billingResult,
                                              List<SkuDetails> skuDetailsList) {
                            if(billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK){
                                
                            } 

                        }
                    });
        }
 //5.0.0（包含）以上版本
 List<String> skuList = new ArrayList<>();
 skuList.add("test1"); //test1 代表产品id,具体产品去后谷歌后台查看id
 List<QueryProductDetailsParams.Product> productList = new ArrayList<>();
 for (String sku: skuList) {
     productList.add(QueryProductDetailsParams.Product.newBuilder()
     .setProductId(sku)
     .setProductType(BillingClient.ProductType.SUBS)
     .build());
 }
 QueryProductDetailsParams queryProductDetailsParams =
                    QueryProductDetailsParams.newBuilder()
                            .setProductList(productList)
                            .build();
            DemoApplication.billingClient.queryProductDetailsAsync(
                    queryProductDetailsParams,
                    new ProductDetailsResponseListener() {
                        public void onProductDetailsResponse(BillingResult billingResult,
                                                             List<ProductDetails> productDetailsList) {
                            if(billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK){


      
                            }
                        }
                    }
            );      
             

4. 调起支付 界面

//5.0.0以下版本
BillingFlowParams billingFlowParams = BillingFlowParams.newBuilder()
                .setSkuDetails(skuDetails)
                .build();
        int responseCode = MyApplication.billingClient.launchBillingFlow(
                GooglePayActivity.this, billingFlowParams).getResponseCode();
        if (responseCode == 0){
            // 调起成功
        } else{
             // 调起失败
        }
 //5.0.0（包含）以上版本
 ImmutableList productDetailsParamsList =
                ImmutableList.of(
                        BillingFlowParams.ProductDetailsParams.newBuilder()
                                // retrieve a value for "productDetails" by calling queryProductDetailsAsync()
                                .setProductDetails(skuDetail)
                                // to get an offer token, call ProductDetails.getSubscriptionOfferDetails()
                                // for a list of offers that are available to the user
                                .setOfferToken(skuDetail.getSubscriptionOfferDetails().get(0).getOfferToken())
                                .build()
                );
        BillingFlowParams billingFlowParams = BillingFlowParams.newBuilder()
                .setProductDetailsParamsList(productDetailsParamsList)
                .build();

// Launch the billing flow
        BillingResult billingResult =  DemoApplication.billingClient.launchBillingFlow( MemberActivity.this, billingFlowParams);       

5. 监听用户是否支付

 private PurchasesUpdatedListener purchasesUpdatedListener = new PurchasesUpdatedListener() {
        @Override
        public void onPurchasesUpdated(BillingResult billingResult, List<Purchase> purchases) {
            // To be implemented in a later section.);

            if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK
                    && purchases != null) {
                for (Purchase purchase : purchases) {
                    //完成支付
                    handlePurchase(purchase);
                }
            } else if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.USER_CANCELED) {
                // 用户取消
            } else {
                // 其他错误
            }

        }
    };

6.用户支付完成，要进行验证，否则测试环境5分钟会自动退单退款，真实环境3天自动退单退款

if (purchase.getPurchaseState() == Purchase.PurchaseState.PURCHASED) {
            if(!purchase.isAcknowledged()){
                //Toast.makeText(MyApplication.this,"支付成功：非消耗类" ,Toast.LENGTH_SHORT).show();
                AcknowledgePurchaseParams acknowledgePurchaseParams =
                        AcknowledgePurchaseParams.newBuilder()
                                .setPurchaseToken(purchase.getPurchaseToken())
                                .build();
                billingClient.acknowledgePurchase(acknowledgePurchaseParams,acknowledgePurchaseResponseListener);

            } else{
                //Toast.makeText(MyApplication.this,"支付成功：消耗类" ,Toast.LENGTH_SHORT).show();
                ConsumeParams consumeParams =
                        ConsumeParams.newBuilder()
                                .setPurchaseToken(purchase.getPurchaseToken())
                                .build();
                billingClient.consumeAsync(consumeParams, listener);
            }
   			//这里可以通知自己app服务器进行相应处理
        }

到这里就完成！！！