Android in-app billing: Can't start async oper

问题:

I am using the IabHelper utility classes, as recommended by Google's tutorial, and I'm being hit hard by this error. Apparently IabHelper can not run multiple async operations at the same time. I even managed to hit it by trying to start a purchase while the inventory taking was still in progress.

I have already tried to implement onActivityResult in my main class as suggested here, but I don't even get a call to that method before the error hits. Then I found this but I have no idea where to find this flagEndAsync method - it's not in the IabHelper class.

Now I'm looking for a way around this (without reimplementing the whole she-bang). The only solution I can think of is to create a boolean field asyncActive that is checked before an async task is started, and not do it if there is another task active. But that has many other problems, and doesn't work across activities. Also I'd prefer to have an async task queue up and run as soon as it's allowed to, instead of not running at all.

Any solutions for this issue?

回答1:

A simple tricky solution

before calling purchaseItem method just add this line

  if (billingHelper != null) billingHelper.flagEndAsync();

so your code looks this way

 if (billingHelper != null) billingHelper.flagEndAsync();
 purchaseItem("android.test.purchased");

Note: don't forget to make public flagEndAsync() method in IabHelper if you call it from another package.

回答2:

Make sure that you call the IabHelper's handleActivityResult in the Activity's onActivityResult, and NOT in the Fragment's onActivityResult.

The following code snippet is from TrivialDrive's MainActivity:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.d(TAG, "onActivityResult(" + requestCode + "," + resultCode + "," + data);
    if (mHelper == null) return;

    // 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);
    }
    else {
        Log.d(TAG, "onActivityResult handled by IABUtil.");
    }
}

Update:

• There is now a In-app Billing Version 3 API (what was the version in 2013?)
• The code sample has moved to Github. Snippet above edited to reflect current sample, but is logically the same as before.

回答3:

This was not easy to crack but I found the needed workarounds. Quite disappointed with Google lately, their Android web sites have become a mess (very hard to find useful info) and their sample code is poor. When I was doing some Android development a few years ago it all went so much easier! This is yet another example of that...

Indeed IabUtil is buggy, it does not properly call off its own async tasks. The complete set of necessary workarounds to stabilise this thing:

1) make method flagEndAsync public. It is there, just not visible.

2) have every listener call iabHelper.flagEndAsync to make sure the procedure is marked finished properly; it seems to be needed in all listeners.

3) surround calls with a try/catch to catch the IllegalStateException which may occur, and handle it that way.

回答4:

I ended up doing something similar to Kintaro. But added mHelper.flagEndAsync() to the end of the catch. The user still gets the toast but by the next time they push the purchase button, the async operation has been killed and the purchase button is ready to go again.

if (mHelper != null) {
    try {
    mHelper.launchPurchaseFlow(this, item, RC_REQUEST, mPurchaseFinishedListener, "");
    }       
    catch(IllegalStateException ex){
        Toast.makeText(this, "Please retry in a few seconds.", Toast.LENGTH_SHORT).show();
        mHelper.flagEndAsync();
    }
}

回答5:

Find flagEndAsync() inside IabHelper.java file and make it public function .

Before trying purchase call flagEndAsync() for your IabHelper .

you must do somthig like this code :

mHelper.flagEndAsync();
mHelper.launchPurchaseFlow(AboutActivity.this, SKU_PREMIUM, RC_REQUEST, mPurchaseFinishedListener, "payload-string");

回答6:

I was having the same issue until I stumbled upon another SO thread. I'm including a touched up version of the code found in the other thread that you need to include in your Activity that initialises the purchase.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    // Pass on the activity result to the helper for handling
    // NOTE: handleActivityResult() will update the state of the helper,
    // allowing you to make further calls without having it exception on you
    if (billingHelper.handleActivityResult(requestCode, resultCode, data)) {
        Log.d(TAG, "onActivityResult handled by IABUtil.");
        handlePurchaseResult(requestCode, resultCode, data);
        return;
    }

    // What you would normally do
    // ...
}

回答7:

A simple trick that did it for me was to create a method in IabHelper:

public Boolean getAsyncInProgress() {
    return mAsyncInProgress;
}

and then in your code, just check:

if (!mHelper.getAsyncInProgress())
    //launch purchase
else
    Log.d(TAG, "Async in progress already..)

回答8:

Really annoying issue. Here is a quick and dirty solution that is not perfect code wise, but that is user friendly and avoids bad ratings and crashes:

if (mHelper != null) {
        try {
        mHelper.launchPurchaseFlow(this, item, RC_REQUEST, mPurchaseFinishedListener, "");
        }       
        catch(IllegalStateException ex){
            Toast.makeText(this, "Please retry in a few seconds.", Toast.LENGTH_SHORT).show();
        }
    }

This way the user just has to tap another time (2 times at worst) and gets the billing popup

Hope it helps

回答9:

Just check for the onActivityResult requestCode on the activity and if it matches the PURCHASE_REQUEST_CODE you used on the purchase just pass it to the fragment.

When you add or replace the fragment in the FragmentTransaction just set a tag:

fTransaction.replace(R.id.content_fragment, fragment, fragment.getClass().getName());

Then on your activity's onActivityResult

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == PurchaseFragment.PURCHASE_REQUEST_CODE) {
        PurchaseFragment fragment = getSuportFragmentManager().findFragmentByTag(PurchaseFragment.class.getNAme());
        if(fragment != null) {
            fragment.onActivityResult(requestCode, resultCode, data);
        }
    }
}

回答10:

if you code in fragment then you this code in IabHelper.java

void flagStartAsync(String operation) {
    if (mAsyncInProgress) {
        flagEndAsync();
    }
    if (mAsyncInProgress) throw new IllegalStateException("Can't start async operation (" +
            operation + ") because another async operation(" + mAsyncOperation + ") is in progress.");
    mAsyncOperation = operation;
    mAsyncInProgress = true;
    logDebug("Starting async operation: " + operation);
}

回答11:

Or, you can get the latest IabHelper.java file here: https://code.google.com/p/marketbilling/source/browse/

The March 15th version fixed this for me. (Note other files with no changes were committed on the 15th)

I still had to fix one crash that happened during testing caused by a null intent extras when "android.test.canceled" was the sent SKU. I changed:

int getResponseCodeFromIntent(Intent i) {
    Object o = i.getExtras().get(RESPONSE_CODE);

to:

int getResponseCodeFromIntent(Intent i) {
    Object o = i.getExtras() != null ? i.getExtras().get(RESPONSE_CODE) : null;

回答12:

I have had this issue occasionally, and in my case I've tracked it down to the fact that if the onServiceConnected method in IabHelper can be called more than once if the underlying service disconnects and reconnects (e.g. due to an intermittent network connection).

The specific operations in my case were "Can't start async operation (refresh inventory) because another async operation(launchPurchaseFlow) is in progress."

The way that my app is written, I can't call launchPurchaseFlow until after I've had a completed queryInventory, and I only call queryInventory from my onIabSetupFinished handler function.

The IabHelper code will call this handler function whenever its onServiceConnected is called, which can happen more than once.

The Android documentation for onServiceDisconnected says:

Called when a connection to the Service has been lost. This typically happens when the process hosting the service has crashed or been killed. This does not remove the ServiceConnection itself -- this binding to the service will remain active, and you will receive a call to onServiceConnected(ComponentName, IBinder) when the Service is next running.

which explains the problem.

Arguably, IabHelper shouldn't call the onIabSetupFinished listener function more than once, but on the other hand it was trivial to fix the problem in my app by simply not calling queryInventory from within this function if I've already done it and got the results.

回答13:

Another major issue with the IabHelpr class is the poor choice of throwing RuntimeExcptions (IllegalStateException) in multiple methods. Throwing RuntimeExeptions from your own code in most cases is not desirable due to the fact that they are unchecked exceptions. That is like sabotaging your own application- if not caught, these exceptions will bubble up and crash your app.

The solution to this is to implement your own checked exception and change the IabHelper class to throw it, instead of the IllegalStateException. That will force you to handle this exception everywhere it could be thrown in your code at compile time.

Here is my custom exception:

public class MyIllegalStateException extends Exception {

    private static final long serialVersionUID = 1L;

    //Parameterless Constructor
    public MyIllegalStateException() {}

    //Constructor that accepts a message
    public MyIllegalStateException(String message)
    {
       super(message);
    }
}

Once we make the changes in the IabHelper class, we can handle our checked exception in our code where we call the class methods. For example:

try {
   setUpBilling(targetActivityInstance.allData.getAll());
} catch (MyIllegalStateException ex) {
    ex.printStackTrace();
}

回答14:

I had the same issue and the problem was that I didn't implement the method onActivityResult.

@Override
protected void onActivityResult(int requestCode,
            int resultCode,
            Intent data)
{
    try
    {
        if (billingHelper == null)
        {
            return;
        } else if (!billingHelper.handleActivityResult(requestCode, resultCode, data))
        {
            super.onActivityResult(requestCode, resultCode, data);
        }
    } catch (Exception exception)
    {
        super.onActivityResult(requestCode, resultCode, data);
    }
}

回答15:

Yes, i am also facing this issue but i resolved this but i resolved using

IabHelper mHelpermHelper = new IabHelper(inappActivity, base64EncodedPublicKey);
  mHelper.flagEndAsync();

The above method stop all the flags. Its work for me must check

回答16:

This answer directly addresses the problem that @Wouter has seen...

It is true that onActivityResult() must be triggered, like many people have said. However, the bug is that Google's code isn't triggering onActivityResult() in certain circumstances, i.e. when you're pressing your [BUY] button twice when running the debug build of your app.

Additionally, one major problem is that the user may be in a shaky environment (i.e. Bus or subway) and presses your [BUY] button twice... suddenly you've got yourself an exception !

At least Google fixed this embarrassing exception https://github.com/googlesamples/android-play-billing/commit/07b085b32a62c7981e5f3581fd743e30b9adb4ed#diff-b43848e47f8a93bca77e5ce95b1c2d66

Below is what I implemented in the same class where IabHelper is instantiated (for me, this is in the Application class) :

/**
 * invokes the startIntentSenderForResult - which will call your activity's onActivityResult() when it's finished
 * NOTE: you need to override onActivityResult() in your activity.
 * NOTE2: check IAB code updates at https://github.com/googlesamples/android-play-billing/tree/master/TrivialDrive/app/src/main/java/com/example/android/trivialdrivesample/util
 * @param activity
 * @param sku
 */
protected boolean launchPurchaseWorkflow(Activity activity, String sku)
{
    if (mIabIsInitialized)
    {
        try
        {
            mHelper.launchPurchaseFlow(
                    activity,
                    sku,
                    Constants.PURCHASE_REQUEST_ID++,// just needs to be a positive number and unique
                    mPurchaseFinishedListener,
                    Constants.DEVELOPER_PAYLOAD);
            return true;//success
        }
        catch (IllegalStateException e)
        {
            mHelper.flagEndAsync();
            return launchPurchaseWorkflow(activity, sku);//recursive call
        }
    }
    else
    {
        return false;//failure - not initialized
    }
}

My [BUY] button calls this launchPurchaseWorkflow() and passes the SKU and the activity the button is in (or if you're in a fragment, the enclosing activity)

NOTE: be sure to make IabHelper.flagEndAsync() public.

Hopefully, Google will improve this code in the near future; this problem is about 3 years old and it's still an ongoing problem :(

回答17:

My solution is simple

1.) Make the mAsyncInProgress variable visible outside of IabHelper

public boolean isAsyncInProgress() {
    return mAsyncInProgress;
}

2.) Use this in your Activity like:

...
if (mIabHelper.AsyncInProgress()) return;
mIabHelper.queryInventoryAsync(...);
...

回答18:

A little-modified version of NadtheVlad's answer that works like charm

private void makePurchase() {

    if (mHelper != null) {
        try {
            mHelper.launchPurchaseFlow(getActivity(), ITEM_SKU, 10001, mPurchaseFinishedListener, "");
        }
        catch(IllegalStateException ex){
            mHelper.flagEndAsync();
            makePurchase();
        }
    }
}

The logic is simple, just put the launchPurchaseFlow() thing in a method and use recursion in the catch block. You still need to make flagEndAsync() public from the IabHelper class.

回答19:

I have same issue, but it resolved! I think you must be not run "launchPurchaseFlow" on UI thread, try to run launchPurchaseFlow on UI thread, it would be working fine!

mActivity.runOnUiThread(new Runnable(){
            public void run(){
                mHelper.launchPurchaseFlow(mActivity, item, 10001, mPurchaseFinishedListener,username);
            }
        });