Android - 应用内购买 - 您需要将 BILLING 权限添加到您的 APK

XML
<uses-permission Android:name="com.Android.vending.BILLING" />

Java
private BillingClient billingClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setcontentView(R.layout.activity_mAIn);
    billingClient = BillingClient.newBuilder(this)
            .setListener(new PurchasesUpdatedListener() {
                @Override
                public void onPurchasesUpdated(BillingResult billingResult, List<Purchase> purchases) {
                    // 处理购买结果
                }
            })
            .build();
    billingClient.startConnection(new BillingClientStateListener() {
        @Override
        public void onBillingSetupFinished(BillingResult billingResult) {
            if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
                // 可以进行应用内购买
            }
        }
        @Override
        public void onBillingServiceDisconnected() {
            // 与Google Play服务断开连接
        }
    });
}

Java
List<String> skuList = new ArrayList<>();
skuList.add("product_id_1");
skuList.add("product_id_2");
SkuDetAIlsParams.Builder params = SkuDetAIlsParams.newBuilder();
params.setSkusList(skuList).setType(BillingClient.SkuType.INAPP);
billingClient.querySkuDetAIlsAsync(params.build(), new SkuDetAIlsResponseListener() {
    @Override
    public void onSkuDetAIlsResponse(BillingResult billingResult, List<SkuDetAIls> skuDetAIlsList) {
        // 处理查询结果
    }
});

Java
BillingFlowParams.Builder flowParams = BillingFlowParams.newBuilder()
        .setSkuDetAIls(skuDetAIls)
        .build();
billingClient.launchBillingFlow(activity, flowParams);