我在市场上有一个应用程序。我的下一个版本我想实现应用内购买。我一直在关注 (long) guide for setup of v3 of in-app billing。我从该链接完成了前 3 节课，但现在我的代码有很多错误，这些错误都在同一个变量上。
在下面的代码中，spreadsheet我的开发者控制台中的 PRODUCT_ID 是用于购买的商品。每次使用变量时spreadsheet，错误都是：“电子表格无法解析为变量。”
public class BibleStudy extends SwarmActivity {
Context c;
IabHelper mHelper;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.biblestudy);
c = this;
String base64EncodedPublicKey = a + b + d + e + f + g + h + i + j + k;
// Create the helper, passing it our context and the public key to verify signatures with
mHelper = new IabHelper(this, base64EncodedPublicKey);
// Start setup. This is asynchronous and the specified listener will be called once setup completes.
mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
public void onIabSetupFinished(IabResult result) {
if (!result.isSuccess()) {
// Oh noes, there was a problem.
complain("Problem setting up in-app billing: " + result);
return;
}
// Hooray, IAB is fully set up. Now, let's get an inventory of stuff we own.
mHelper.queryInventoryAsync(mGotInventoryListener);
}
});
}
// Listener that's called when we finish querying the items and subscriptions we own.
IabHelper.QueryInventoryFinishedListener mGotInventoryListener = new IabHelper.QueryInventoryFinishedListener() {
public void onQueryInventoryFinished(IabResult result, Inventory inventory) {
if (result.isFailure()) {
complain("Failed to query inventory: " + result);
return;
}
/*
* Check for items we own. Notice that for each purchase, we check
* the developer payload to see if it's correct! See
* verifyDeveloperPayload().
*/
// Do we have the premium upgrade?
Purchase spreadsheetPurchase = inventory.getPurchase(spreadsheet);
updateUi();
}
};
// User clicked the "Download Spreadsheet!" button.
public void onBuyButtonClick(View v) {
// launch the gas purchase UI flow.
// We will be notified of completion via mPurchaseFinishedListener
/* TODO: for security, generate your payload here for verification. See the comments on
* verifyDeveloperPayload() for more info. Since this is a SAMPLE, we just use
* an empty string, but on a production app you should carefully generate this. */
String payload = "";
mHelper.launchPurchaseFlow(this, spreadsheet, 10001, mPurchaseFinishedListener, payload);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// Pass on the activity result to the helper for handling
if(!mHelper.handleActivityResult(requestCode, resultCode, data)) {
// not handled, so handle it ourselves (here's where you'd
// perform any handling of activity results not related to in-app
// billing...
super.onActivityResult(requestCode, resultCode, data);
}
}
/** Verifies the developer payload of a purchase. */
boolean verifyDeveloperPayload(Purchase p) {
String payload = p.getDeveloperPayload();
/*
* TODO: verify that the developer payload of the purchase is correct. It will be
* the same one that you sent when initiating the purchase.
*
* WARNING: Locally generating a random string when starting a purchase and
* verifying it here might seem like a good approach, but this will fail in the
* case where the user purchases an item on one device and then uses your app on
* a different device, because on the other device you will not have access to the
* random string you originally generated.
*
* So a good developer payload has these characteristics:
*
* 1. If two different users purchase an item, the payload is different between them,
* so that one user's purchase can't be replayed to another user.
*
* 2. The payload must be such that you can verify it even when the app wasn't the
* one who initiated the purchase flow (so that items purchased by the user on
* one device work on other devices owned by the user).
*
* Using your own server to store and verify developer payloads across app
* installations is recommended.
*/
return true;
}
// Callback for when a purchase is finished
IabHelper.OnIabPurchaseFinishedListener mPurchaseFinishedListener = new IabHelper.OnIabPurchaseFinishedListener() {
public void onIabPurchaseFinished(IabResult result, Purchase purchase) {
if(result.isFailure()) {
complain("Error purchasing: " + result);
return;
}
if(!verifyDeveloperPayload(purchase)) {
complain("Error purchasing. Authenticity verification failed.");
return;
}
else if(purchase.getSku().equals(spreadsheet)) {
// bought the premium upgrade!
alert("Thank you for upgrading to premium!");
// mIsPremium = true;
updateUi();
}
}
};
// updates UI to reflect model
public void updateUi() {
// MATT: update a TextView to show link after purchase is done.
// // update the car color to reflect premium status or lack thereof
// ((ImageView)findViewById(R.id.free_or_premium)).setImageResource(mIsPremium ? R.drawable.premium : R.drawable.free);
//
// // "Upgrade" button is only visible if the user is not premium
// findViewById(R.id.upgrade_button).setVisibility(mIsPremium ? View.GONE : View.VISIBLE);
//
// // "Get infinite gas" button is only visible if the user is not subscribed yet
// findViewById(R.id.infinite_gas_button).setVisibility(mSubscribedToInfiniteGas ?
// View.GONE : View.VISIBLE);
//
// // update gas gauge to reflect tank status
// if (mSubscribedToInfiniteGas) {
// ((ImageView)findViewById(R.id.gas_gauge)).setImageResource(R.drawable.gas_inf);
// }
// else {
// int index = mTank >= TANK_RES_IDS.length ? TANK_RES_IDS.length - 1 : mTank;
// ((ImageView)findViewById(R.id.gas_gauge)).setImageResource(TANK_RES_IDS[index]);
// }
}
void complain(String message) {
alert("Error: " + message);
}
void alert(String message) {
AlertDialog.Builder bld = new AlertDialog.Builder(this);
bld.setMessage(message);
bld.setNeutralButton("OK", null);
bld.create().show();
}
@Override
public void onDestroy() {
super.onDestroy();
if(mHelper != null) mHelper.dispose();
mHelper = null;
}
}
购买成功后我想要做的是为用户提供一个链接。所以我想我需要的是我可以验证购买是否完成的东西，然后我可以显示一个以前不可见的 TextView 为他们提供链接。
我的问题是我在教程中做错了什么，我怎样才能消除出现在spreadsheet使用该变量的每个人身上的错误？