Hi,
in this tutorial i will show you how to add an in app product to your android app.
There is an official tutorial by @Erel so you should also check that out: https://b4x.com/android/forum/threads/android-in-app-billing-v3-tutorial.29997/
Step 1:
First we need to create an in_app product in our developer console (google play)
but to do that we need to upload an .apk that include InAppBilling3 lib.
so just create an app and check that lib and upload it to the dev console (without adding any code)
after your dev console will recognize you have uploaded an apk that include the in_app library it will allow you to create an in_app product.
Step2:
when you add a new in_app product you can choose between a "Managed Product" and "Subscription"
a "Managed Product" is a product that the user purchase only once like: remove ads, skip level, coins,..
a "Subscription" is a product that will charge the user every x period like: news letter subscription,...
in this tutorial we will create a "Managed Product" (no_Ads).
So create your Product and then copy your In_App ID that you can find here (write also the Product ID down, you will need it later):
Step 3: (coding)
Ok now we are ready for some code but first you need to know that your app will probably crash on an emulator so you should test it on a real device.
i will explain how i do it in my apps (but it doesn't mean that this is the only (or the right
) way)
in android on every app start (if firsttime = true) we check if user has purchased one of our products.
First we will intialize the "manager" and this will automaticly call the sub "manager_BillingSupported" and check if billing is supported.
if billing is supported we will ask for a list of all owned products by that user and this is done in sub "manager_OwnedProducts".
then we will check if the "no_ads" product is included in that list (map).
if "no_ads" product has been purchased then we should turn off ads, right?
but what happens when the user purchase the "no_ads" product and the "BillingSupported" request fail to run on app create?
(lets say the user had no internet connection at that moment)
if adtimer will run on every app start that means that ads will be shown even if he has purchased the "no_ads" product.
so the user could be very mad if he see ads after he has purchased the "no_ads" product, so what should we do?
the timer (that request ad's) is in default enabled on every app_create (start on every app start).so how can we avoid a situation where the user see ads even if he has purchased the "no_ads: product?
what i do is, i create a txt file called "ad.txt" after user has purchased the "no_ads" product and then on every app start i will check for that file. if it exists then i disable the adtimer until i am able to check again if user has purchased the "no_ads" product. (on next app start)
you will probably ask now why should i check on every app start if the user has purchased the "no_ads" product? lets create that file on "app purchase" and if file.exist ("ad.txt") then skip the "Get_ownedproducts" process, right?
well that is wrong, because if he purchase the product you create that file and then if he cancel his purchase that file will still exists and no ads will be shown. so the "ad.txt" file just change the default settings of the adtimer from "enable/disable on every activity_create"
ok enough talking, everything should be clear enough from the code bellow. if you have questions don't hesitate to ask and if you have a better solution you are welcome to post it here.
regards, ilan
Activity Code:
in this tutorial i will show you how to add an in app product to your android app.
There is an official tutorial by @Erel so you should also check that out: https://b4x.com/android/forum/threads/android-in-app-billing-v3-tutorial.29997/
Step 1:
First we need to create an in_app product in our developer console (google play)
but to do that we need to upload an .apk that include InAppBilling3 lib.
so just create an app and check that lib and upload it to the dev console (without adding any code)
after your dev console will recognize you have uploaded an apk that include the in_app library it will allow you to create an in_app product.
Step2:
when you add a new in_app product you can choose between a "Managed Product" and "Subscription"
a "Managed Product" is a product that the user purchase only once like: remove ads, skip level, coins,..
a "Subscription" is a product that will charge the user every x period like: news letter subscription,...
in this tutorial we will create a "Managed Product" (no_Ads).
So create your Product and then copy your In_App ID that you can find here (write also the Product ID down, you will need it later):
Step 3: (coding)
Ok now we are ready for some code but first you need to know that your app will probably crash on an emulator so you should test it on a real device.
i will explain how i do it in my apps (but it doesn't mean that this is the only (or the right
) way)in android on every app start (if firsttime = true) we check if user has purchased one of our products.
First we will intialize the "manager" and this will automaticly call the sub "manager_BillingSupported" and check if billing is supported.
if billing is supported we will ask for a list of all owned products by that user and this is done in sub "manager_OwnedProducts".
then we will check if the "no_ads" product is included in that list (map).
if "no_ads" product has been purchased then we should turn off ads, right?
but what happens when the user purchase the "no_ads" product and the "BillingSupported" request fail to run on app create?
(lets say the user had no internet connection at that moment)
if adtimer will run on every app start that means that ads will be shown even if he has purchased the "no_ads" product.
so the user could be very mad if he see ads after he has purchased the "no_ads" product, so what should we do?
the timer (that request ad's) is in default enabled on every app_create (start on every app start).so how can we avoid a situation where the user see ads even if he has purchased the "no_ads: product?
what i do is, i create a txt file called "ad.txt" after user has purchased the "no_ads" product and then on every app start i will check for that file. if it exists then i disable the adtimer until i am able to check again if user has purchased the "no_ads" product. (on next app start)
you will probably ask now why should i check on every app start if the user has purchased the "no_ads" product? lets create that file on "app purchase" and if file.exist ("ad.txt") then skip the "Get_ownedproducts" process, right?
well that is wrong, because if he purchase the product you create that file and then if he cancel his purchase that file will still exists and no ads will be shown. so the "ad.txt" file just change the default settings of the adtimer from "enable/disable on every activity_create"
ok enough talking, everything should be clear enough from the code bellow. if you have questions don't hesitate to ask and if you have a better solution you are welcome to post it here.
regards, ilan
Activity Code:
B4X:
#Region Project Attributes
#ApplicationLabel: InApp Example
#VersionCode: 1
#VersionName: 1.0
'SupportedOrientations possible values: unspecified, landscape or portrait.
#SupportedOrientations: portrait
#CanInstallToExternalStorage: False
#AdditionalRes: C:\Android SDK\extras\google\google_play_services\libproject\google-play-services_lib\res, com.google.android.gms
#End Region
#Region Activity Attributes
#FullScreen: False
#IncludeTitle: false
#End Region
Sub Process_Globals
Dim adtimer As Timer
Dim manager As BillingManager3
Private inappkey As String = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAiIEJEB/JNzDSn8YoWUE/dq7/q8HDUjUL5np0tSmk3pdauYO2rRMvDNxXO4e+FqgYhYjswBKdFeIlzLVF8+y2J49G85eaznP8ZYbt0vexH6lpk0iJxrfOxeGo8BY3IvUaCm0PXwdM9gos+XwZo14lr+pFSfpR/qd7PzXBqtdZ9NxvAyAnlLGrpzHuTApRCp8EIMc1kYZHd/pGtTcRyLuCGxFW0cbsrpKUIMHzDe1S/pp7bRqs3tMjagySWx0Kzic0ufxxa6v/XzbBDQPeSpyIcZLFxNuDBrZElu83cC39JZz1kKiGSfcMmsz/eegJo/AdII8CVkJjY5ov6CG64i+cPQIDAQAB"
End Sub
Sub Globals
Dim b As Button
Dim mwAdInterstitial As mwAdmobInterstitial 'interstitial ad (admob)
End Sub
Sub Activity_Create(FirstTime As Boolean)
Activity.Color = Colors.White
adtimer.Initialize("adtimer",25000) '25sec to show ad
b.Initialize("Button")
b.Text = "No Ads"
b.Color = Colors.DarkGray
b.TextColor = Colors.White
Activity.AddView(b,20dip,20dip,150dip,50dip)
mwAdInterstitial.Initialize("mwadi","pub-8081096xxxxxxxxxxxxxxxxxxx")
mwAdInterstitial.LoadAd
If FirstTime Then
manager.Initialize("manager", inappkey)
manager.DebugLogging = True
End If
If File.Exists(File.DirInternal,"ad.txt") Then adtimer.Enabled = False 'change default ad support to off
End Sub
Sub Button_Click
manager.RequestPayment("remove_ads","inapp","remove_ads") 'request purchase with ID "remove_ads"
End Sub
Sub manager_BillingSupported (Supported As Boolean, Message As String) 'First we check if Billing is supported
Log(Supported & ", " & Message)
Log("Subscriptions supported: " & manager.SubscriptionsSupported)
If Supported Then manager.GetOwnedProducts 'if support true then get owend product by this user
End Sub
Sub manager_OwnedProducts (Success As Boolean, purchases As Map)
Log(Success)
Dim purchased_noAds_from_store As Boolean = False 'set a boolean to false and if item with specific ID was purchased change to true
If Success Then
Log(purchases)
For Each p As Purchase In purchases.Values
Log(p.ProductId & ", Purchased? " & (p.PurchaseState = p.STATE_PURCHASED))
If p.ProductId = "remove_ads" And p.PurchaseState = p.STATE_PURCHASED Then 'check if item NoAds was purchased
purchased_noAds_from_store = True 'set boolean to true
Purchased_NoAds(True)
End If
Next
If purchased_noAds_from_store = False Then Purchased_NoAds(False) 'delete file and start timer
End If
End Sub
Sub manager_PurchaseCompleted (Success As Boolean, Product As Purchase)
Log(Product)
Log(Success)
If Success Then
If Product.ProductId = "remove_ads" Then Purchased_NoAds(True)
End If
End Sub
Sub Purchased_NoAds(purchased As Boolean)
If purchased Then
adtimer.Enabled = False 'stop timer if was on
If File.Exists(File.DirInternal,"ad.txt") = False Then 'create no ad file
Dim writer1 As TextWriter
writer1.Initialize(File.OpenOutput(File.DirInternal,"ad.txt", False))
writer1.WriteLine("1")
writer1.Close
End If
Else
If File.Exists(File.DirInternal,"ad.txt") Then File.Delete(File.DirInternal,"ad.txt") 'delete file
adtimer.Enabled = True 'start timer
End If
End Sub
Sub adtimer_tick
If mwAdInterstitial.Status=mwAdInterstitial.Status_AdReadyToShow Then
adtimer.Interval = 240000 'change the time between ads (so people will also see your app and not only ads ;))
mwAdInterstitial.Show
Else
mwAdInterstitial.LoadAd
adtimer.Interval = 15000 'if fail - load again and show in 15 sec
End If
End Sub
Sub mwadi_AdLoaded
Log("ad loaded")
End Sub
Sub mwadi_AdFailedToLoad (ErrorMessage As String)
Log("failed to load ad: " & ErrorMessage)
End Sub
Sub mwadi_AdClosed '*******************
Log("ad closed")
End Sub
Sub Activity_Resume
End Sub
Sub Activity_Pause (UserClosed As Boolean)
End Sub
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