Showing ads in your app? Wanna offer a single in-app purchase to remove them? Premiumer does just that!

How?

Using Premiumer is incredibly easy. First, add the following dependency:

compile 'com.github.tslamic:premiumer2:1.0'

Then, create an instance:

Premiumer premiumer = PremiumerBuilder.with(context)
    .sku(billingSku)
    .listener(premiumerListnener)
    .build();

Next, bind to the underlying in-app billing service. This should usually follow the Activity or Fragment lifecycle. Also, ensure premiumer can handle purchase results by overriding onActivityResult. For example:

@Override protected void onStart() {
  super.onStart();
  premiumer.bind();
}

@Override protected void onStop() {
  super.onStop();
  premiumer.unbind();
}

@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (!premiumer.handleActivityResult(requestCode, resultCode, data)) {
    super.onActivityResult(requestCode, resultCode, data);
  }
}

If the in-app billing service is availabe and premiumer was successfully bound, onBillingAvailable() will be invoked on the listener you provided in the builder, onBillingUnavailable() otherwise.

You're now all set! 🎉

To perform a purchase, invoke premiumer.purchase(Activity). This should be the same Activity overriding onActivityResult. Just before a purchase is shipped over to in-app billing service for processing, you'll receive a onPurchaseRequested(String) callback.

The String argument is a developer-specified payload, uniquely identifying a purchase. By default, Premiumer will use a randomly generated UUID, but you can easily provide your own PayloadGenerator when building a Premiumer instance:

PremiumerBuilder.with(context)
    .sku(billingSku)
    .listener(premiumerListnener)
    .payloadGenerator(customGenerator); // custom generator
    .build();

Once a purchase is processed, the in-app billing service will return a result to the Activity triggering the purchase. If you've properly overriden onActivityResult, Premiumer will notify you what happened:

Callback	Meaning
onPurchaseBadResult (int, Intent)	purchase result was not OK, e.g. the user cancelled the purchase flow
onPurchaseBadResponse(Intent)	in-app billing response was incomplete or missing information
onPurchaseFailedVerification()	purchase verification failed
onPurchaseSuccessful(Purchase)	purchase succeeded

By default, no purchase verification is done. You can change that, however, by providing a PurchaseVerifier instance when building Premiumer:

PremiumerBuilder.with(context)
    .sku(billingSku)
    .listener(premiumerListnener)
    .purchaseVerifier(verifier); // custom verifier
    .build();

When a purchase is successful, Premiumer will, by default, store the purchase information in plain text to SharedPreferences. You can provide a different caching mechanism by specifying PurchaseCache when building Premiumer:

PremiumerBuilder.with(context)
    .sku(billingSku)
    .listener(premiumerListnener)
    .purchaseCache(cache); // custom cache
    .build();

You can always obtain the information about the item you're about to purchase by invoking premiumer.skuDetails(). This will return onSkuDetails(SkuDetails) callback.

Similarly, once a purchase has been made, you can retrieve it by invoking premiumer.purchaseDetails(). This will invoke onPurchaseDetails(Purchase callback.

If, for any reason, you wish to consume a purchase, invoke premiumer.consumeSku(). If successful, onSkuConsumed() will be invoked, onFailedToConsumeSku() otherwise.

Callbacks

As you might have guessed, all Premiumer interaction results in a PremiumerListener callback. Here's the complete list:

Method name	Meaning
onShowAds()	Invoked if ads should be visible.
onHideAds()	Invoked if ads should be hidden.
onBillingAvailable()	Invoked if in-app Billing is available.
onBillingUnavailable()	Invoked if in-app Billing is unavailable.
onSkuDetails(SkuDetails)	Invoked when SkuDetails information is retireved.
onSkuConsumed()	Invoked if sku has been successfully consumed.
onFailedToConsumeSku()	Invoked if sku has not been successfully consumed.
onPurchaseRequested(String)	Invoked on a purchase request.
onPurchaseDetails(Purchase)	Invoked when purchase details are retrieved.
onPurchaseSuccessful(Purchase)	Invoked on a successful purchase.
onPurchaseBadResult(int, Intent)	Invoked when the sku purchase is unsuccessful.
onPurchaseBadResponse(Intent)	Invoked when the sku purchase returns bad data.
onPurchaseFailedVerification()	Invoked if a purchase has failed verification.

If you feel that's too much, you can cherry pick the methods by extending SimplePremiumerListener.

Contribution

Improvement suggestions, bug reports, pull requests, etc. are very welcome and greatly appreciated!

License

Copyright 2017 Tadej Slamic

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.