如何使用 getPurchases() - Android答案

【问题标题】：How to use getPurchases() - Android如何使用 getPurchases() - Android
【发布时间】：2019-02-08 18:03:45
【问题描述】：

我已成功将 In-App-Billing 实施到我的应用中。 IAP 运行成功，我已经对其进行了测试以确保其正常运行。

当用户单击按钮时，他们必须进行 IAP 才能继续。但是，每次用户单击该按钮时，它都会启动 IAP，即使他们已经创建了 IAP。我希望我的 IAP 显然是非消耗品。目前，我将 IAP 存储在 SharedPreferences 中，但如果用户重新安装该应用程序，他们将失去其 IAP。

那么如何在我的onCreate 或onClick 方法上使用getPurchases() 或restoreTransactions() 来检查用户是否购买了特定商品？我已经在互联网上搜索并阅读了这么多示例，但它似乎不起作用，也许我是误会了。

如果您需要我发布任何代码，请询问，我会更新我的帖子。

【问题讨论】：

标签： java android in-app-purchase sharedpreferences in-app-billing

【解决方案1】：

使用这个库：

https://github.com/anjlab/android-inapp-billing-v3

如何使用？

在你的 gradle 中使用它：

repositories {
  mavenCentral()
}
dependencies {
  implementation 'com.anjlab.android.iab.v3:library:1.0.44'
}

应用内结算的清单权限：

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

如何使用库方法：

public class SomeActivity extends Activity implements BillingProcessor.IBillingHandler {
  BillingProcessor bp;

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

    bp = new BillingProcessor(this, "YOUR LICENSE KEY FROM GOOGLE PLAY CONSOLE HERE", this);
    bp.initialize();
    // or bp = BillingProcessor.newBillingProcessor(this, "YOUR LICENSE KEY FROM GOOGLE PLAY CONSOLE HERE", this);
    // See below on why this is a useful alternative
  }

  // IBillingHandler implementation

  @Override
  public void onBillingInitialized() {
    /*
    * Called when BillingProcessor was initialized and it's ready to purchase 
    */
  }

  @Override
  public void onProductPurchased(String productId, TransactionDetails details) {
    /*
    * Called when requested PRODUCT ID was successfully purchased
    */
  }

  @Override
  public void onBillingError(int errorCode, Throwable error) {
    /*
    * Called when some error occurred. See Constants class for more details
    * 
    * Note - this includes handling the case where the user canceled the buy dialog:
    * errorCode = Constants.BILLING_RESPONSE_RESULT_USER_CANCELED
    */
  }

  @Override
  public void onPurchaseHistoryRestored() {
    /*
    * Called when purchase history was restored and the list of all owned PRODUCT ID's 
    * was loaded from Google Play
    */
  }
}

注意：onPurchaseHistoryRestored 仅在您初始化 BillingProcessor 时第一次调用

【讨论】：

【解决方案2】：

他们有很多方法可以检查 onPurchaseHistoryRestored() 但这是我的意见。我已经通过使用解决了它.. 您可以使用此代码检查横断面详细信息。

@Override
    public void onPurchaseHistoryRestored() {
        /*
         * Called when purchase history was restored and the list of all owned PRODUCT ID's
         * was loaded from Google Play
         */

        // Check whether 'premium_id' has previously been purchased:
        TransactionDetails premiumTransactionDetails = bp.getPurchaseTransactionDetails("premium_id");

        if (premiumTransactionDetails == null) {
            Log.i(TAG, "onPurchaseHistoryRestored(): Havn't bought premium yet.");
            purchasePremiumButton.setEnabled(true);
        }
        else {
            Log.i(TAG, "onPurchaseHistoryRestored(): Already purchases premium.");

            purchasePremiumButton.setText(getString(R.string.you_have_premium));
            purchasePremiumButton.setEnabled(false);
            statusTextView.setVisibility(View.INVISIBLE);
        }
    }

第二个是检查“产品ID”。检查下面的代码。

if(bp.isPurchased(REMOVE_ID_SKU)){
if (bp.loadOwnedPurchasesFromGoogle()) {
Toast.makeText(this, R.string.subs_updated, Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, R.string.no_purchases, Toast.LENGTH_SHORT).show();
}
}

【讨论】：