HOW TO MAKE MULTIPLE IN APP PURCHASE IN ANDROID USING GOOGLE PLAY BILLING LIBRARY
Please Subscribe Youtube| Like Facebook | Follow Twitter
Introduction
In this article we will learn how to integrate and make in app purchase of Multiple Non-consumable one-time products using google play billing library.
Tips
| Article | Java | Kotlin |
| For Single Non-consumable one-time product | link | link |
| For Multiple Non-consumable one-time product | link | link |
| For Single Consumable one-time product | link | link |
| For Multiple Consumable one-time product | link | link |
| For Single In App Subscriptions | link | link |
| For Multiple In App Subscriptions | link | link |
Our Example
In our example we have a listview which shows list of non consumable purchase items and on click of particular item from list allows user to purchase that non consumable item from list. When the particular item is purchased then we will acknowledge that purchase item as well as save its value in preference and refresh the list.
On every app start we will check purchase status of items from Google Play Store Cache and reflect necessary changes accordingly because if user already purchased item previously and re-installs the app or switch to another device or refunded the purchased item, therefore we will store updated purchase status value in user preference.
Google Play Store Cache works best on both offline as well as online. When there is no internet Cache will contain last updated purchase status of item. When internet become available Play Store Cache will be updated automatically with latest purchase status of item. Google Play Store Cache updated roughly every 24 hours or immediately on every purchase.
Requirements:
- Android Project/App to which In App Purchase Item to be added
- Google play console account
Note: In order to create in app product items in Google Console or perform real test of in app purchase item in your app, you first need to Integrate Google Play Library and add billing permission in your project and then upload that apk on Google play console and publish it any track (Internal test track (recommended), Closed track, Open track, Production track). Therefore we will perform these actions first.
Steps
Follow below steps
1 Integrate Google Play Library in your project
2 Create an application and fill Store listing in Google play console
3 Upload and publish your app
4 Create Non Consumable product items “p1” “p2” “p3” in Google play console
5 Code in app purchase flow logic.
6 Run and Test the application
Step 1 to 3 already explained in this article so follow these steps from there.
4 Create Non Consumable product items in Google play console
After releasing app go to Monetize -> Products -> In-app products.
Click on create and fill necessary info then save and activate the product items. Create three product items and give them id “p1”, “p2”, “p3” respectively.
5 Code in app purchase flow logic.
First make sure you have added Google Play Billing Library dependency and billing permission, which was described in step 1.
For multiple purchase items we have to make arraylist of purchase item ids and loop through purchase list and make necessary changes. Note that we have assigned preference key and product item id same. You can check these in whole code of MainActivity.
First Add listview in activity_main.xml Layout.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</LinearLayout>In order to make In-App purchase our MainActivity needs to implements PurchasesUpdatedListener interface and override onPurchasesUpdated() method which will be called every time to get notifications for purchases updates. Both purchases initiated by your app and the ones initiated outside of your app will be reported here.
We also need to create BillingClient Object and set listener to it so that we can communicate with Google Play Billing Service.
public class MainActivity extends AppCompatActivity implements PurchasesUpdatedListener {
private BillingClient billingClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
billingClient = BillingClient.newBuilder(this)
.enablePendingPurchases().setListener(this).build();
}
@Override
public void onPurchasesUpdated(BillingResult billingResult, @Nullable
List<Purchase> purchases) {
//we will code purchase result logic later
}
}Now on every item click from list we will initiate purchase flow of that particular item.
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
if(getPurchaseItemValueFromPref(purchaseItemIDs.get(position))){
Toast.makeText(getApplicationContext(),purchaseItemIDs.get(position)+" is Already Purchased",Toast.LENGTH_SHORT).show();
//selected item is already purchased
return;
}
//initiate purchase on selected product item click
//check if service is already connected
if (billingClient.isReady()) {
initiatePurchase(purchaseItemIDs.get(position));
}
//else reconnect service
else{
billingClient = BillingClient.newBuilder(MainActivity.this).enablePendingPurchases().setListener(MainActivity.this).build();
billingClient.startConnection(new BillingClientStateListener() {
@Override
public void onBillingSetupFinished(@NonNull BillingResult billingResult) {
if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
initiatePurchase(purchaseItemIDs.get(position));
} else {
Toast.makeText(getApplicationContext(),"Error "+billingResult.getDebugMessage(),Toast.LENGTH_SHORT).show();
}
}
@Override
public void onBillingServiceDisconnected() {
}
});
}
}
});In initiatePurchase() method we have passed selected product id and specified product type as INAPP. Then we have called querySkuDetailsAsync() method which will query our product from Play console. After querying we will call launchBillingFlow() method which will display purchase dialog. Result of purchase dialog will be reported inside onPurchasesUpdated() method which we will code next.
private void initiatePurchase(final String PRODUCT_ID) {
List<String> skuList = new ArrayList<>();
skuList.add(PRODUCT_ID);
SkuDetailsParams.Builder params = SkuDetailsParams.newBuilder();
params.setSkusList(skuList).setType(INAPP);
billingClient.querySkuDetailsAsync(params.build(),
new SkuDetailsResponseListener() {
@Override
public void onSkuDetailsResponse(@NonNull BillingResult billingResult,
List<SkuDetails> skuDetailsList) {
if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
if (skuDetailsList != null && skuDetailsList.size() > 0) {
BillingFlowParams flowParams = BillingFlowParams.newBuilder()
.setSkuDetails(skuDetailsList.get(0))
.build();
billingClient.launchBillingFlow(MainActivity.this, flowParams);
}
else{
//try to add item/product id "p1" "p2" "p3" inside managed product in google play console
Toast.makeText(getApplicationContext(),"Purchase Item "+PRODUCT_ID+" not Found",Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(),
" Error "+billingResult.getDebugMessage(), Toast.LENGTH_SHORT).show();
}
}
});
}In onPurchasesUpdated() method we will check purchase result and handle it accordingly.
@Override
public void onPurchasesUpdated(BillingResult billingResult, @Nullable List<Purchase> purchases) {
//if item newly purchased
if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK && purchases != null) {
handlePurchases(purchases);
}
//if item already purchased then check and reflect changes
else if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.ITEM_ALREADY_OWNED) {
Purchase.PurchasesResult queryAlreadyPurchasesResult = billingClient.queryPurchases(INAPP);
List<Purchase> alreadyPurchases = queryAlreadyPurchasesResult.getPurchasesList();
if(alreadyPurchases!=null){
handlePurchases(alreadyPurchases);
}
}
//if purchase cancelled
else if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.USER_CANCELED) {
Toast.makeText(getApplicationContext(),"Purchase Canceled",Toast.LENGTH_SHORT).show();
}
// Handle any other error msgs
else {
Toast.makeText(getApplicationContext(),"Error "+billingResult.getDebugMessage(),Toast.LENGTH_SHORT).show();
}
}In handlePurchases() method we will handle, verify and acknowledge purchase. After the purchase, acknowledgement is necessary because failure to properly acknowledge purchase will result in purchase being refunded. After the acknowledgement we will save purchase value in preference and refresh list.
This method also toast user to complete transaction if purchase status is pending. In case of unspecified purchase state we save false value of that product in preference.
void handlePurchases(List<Purchase> purchases) {
for(Purchase purchase:purchases) {
final int index=purchaseItemIDs.indexOf(purchase.getSku());
//purchase found
if(index>-1) {
//if item is purchased
if (purchase.getPurchaseState() == Purchase.PurchaseState.PURCHASED)
{
if (!verifyValidSignature(purchase.getOriginalJson(), purchase.getSignature())) {
// Invalid purchase
// show error to user
Toast.makeText(getApplicationContext(), "Error : Invalid Purchase", Toast.LENGTH_SHORT).show();
continue;//skip current iteration only because other items in purchase list must be checked if present
}
// else purchase is valid
//if item is purchased and not Acknowledged
if (!purchase.isAcknowledged()) {
AcknowledgePurchaseParams acknowledgePurchaseParams =
AcknowledgePurchaseParams.newBuilder()
.setPurchaseToken(purchase.getPurchaseToken())
.build();
billingClient.acknowledgePurchase(acknowledgePurchaseParams,
new AcknowledgePurchaseResponseListener() {
@Override
public void onAcknowledgePurchaseResponse(BillingResult billingResult) {
if(billingResult.getResponseCode()==BillingClient.BillingResponseCode.OK){
//if purchase is acknowledged
//then saved value in preference
savePurchaseItemValueToPref(purchaseItemIDs.get(index),true);
Toast.makeText(getApplicationContext(), purchaseItemIDs.get(index)+" Item Purchased", Toast.LENGTH_SHORT).show();
notifyList();
}
}
});
}
//else item is purchased and also acknowledged
else {
// Grant entitlement to the user on item purchase
if(!getPurchaseItemValueFromPref(purchaseItemIDs.get(index))){
savePurchaseItemValueToPref(purchaseItemIDs.get(index),true);
Toast.makeText(getApplicationContext(), purchaseItemIDs.get(index)+" Item Purchased.", Toast.LENGTH_SHORT).show();
notifyList();
}
}
}
//if purchase is pending
else if( purchase.getPurchaseState() == Purchase.PurchaseState.PENDING)
{
Toast.makeText(getApplicationContext(),
purchaseItemIDs.get(index)+" Purchase is Pending. Please complete Transaction", Toast.LENGTH_SHORT).show();
}
//if purchase is refunded or unknown
else if( purchase.getPurchaseState() == Purchase.PurchaseState.UNSPECIFIED_STATE)
{
//mark purchase false in case of UNSPECIFIED_STATE
savePurchaseItemValueToPref(purchaseItemIDs.get(index),false);
Toast.makeText(getApplicationContext(), purchaseItemIDs.get(index)+" Purchase Status Unknown", Toast.LENGTH_SHORT).show();
notifyList();
}
}
}
}For verification we have used client side signature verification, which will be performed with in app (less secure). However if you can afford server then you should do verification of purchase through your server (more secure).
In client side verification you need to add your developer’s public key of app.
For old Play Console Design To get key go to Developer Console > Select your app > Development Tools > Services & APIs.
For new Play Console Design To get key go to Developer Console > Select your app > Monetize > Monetization setup
Then paste that key to String variable base64key in below method.
/**
* Verifies that the purchase was signed correctly for this developer's public key.
* <p>Note: It's strongly recommended to perform such check on your backend since hackers can
* replace this method with "constant true" if they decompile/rebuild your app.
* </p>
*/
private boolean verifyValidSignature(String signedData, String signature) {
try {
// To get key go to Developer Console > Select your app > Development Tools > Services & APIs.
String base64Key = "Add Your Key Here"
return Security.verifyPurchase(base64Key, signedData, signature);
} catch (IOException e) {
return false;
}
}Code of Security.java is at whole code section
Up to that point our purchase logic is complete. Now On every app start we will check purchase status of items from Google Play Store Cache using getPurchasesList() method and reflect necessary changes accordingly because if user already purchased item previously and reinstalls the app or switch to another device or refunded the purchased item therefore we should store updated purchase status in user preference. After querying we will call handlePurchases() method which will make necessary changes accordingly. Arraylist purchaseFound is used to loop through each purchase items and update their values in preferences.
billingClient.startConnection(new BillingClientStateListener() {
@Override
public void onBillingSetupFinished(@NonNull BillingResult billingResult) {
if(billingResult.getResponseCode()==BillingClient.BillingResponseCode.OK){
Purchase.PurchasesResult queryPurchase = billingClient.queryPurchases(INAPP);
List<Purchase> queryPurchases = queryPurchase.getPurchasesList();
if(queryPurchases!=null && queryPurchases.size()>0){
handlePurchases(queryPurchases);
}
//check which items are in purchase list and which are not in purchase list
//if items that are found add them to purchaseFound
//check status of found items and save values to preference
//item which are not found simply save false values to their preference
//indexOf return index of item in purchase list from 0-2 (because we have 3 items) else returns -1 if not found
ArrayList<Integer> purchaseFound =new ArrayList<Integer> ();
if(queryPurchases!=null && queryPurchases.size()>0){
//check item in purchase list
for(Purchase p:queryPurchases){
int index=purchaseItemIDs.indexOf(p.getSku());
//if purchase found
if(index>-1)
{
purchaseFound.add(index);
if(p.getPurchaseState() == Purchase.PurchaseState.PURCHASED)
{
savePurchaseItemValueToPref(purchaseItemIDs.get(index),true);
}
else{
savePurchaseItemValueToPref(purchaseItemIDs.get(index),false);
}
}
}
//items that are not found in purchase list mark false
//indexOf returns -1 when item is not in foundlist
for(int i=0;i < purchaseItemIDs.size(); i++){
if(purchaseFound.indexOf(i)==-1){
savePurchaseItemValueToPref(purchaseItemIDs.get(i),false);
}
}
}
//if purchase list is empty that means no item is not purchased
//Or purchase is refunded or canceled
//so mark them all false
else{
for( String purchaseItem: purchaseItemIDs ){
savePurchaseItemValueToPref(purchaseItem,false);
}
}
}
}
@Override
public void onBillingServiceDisconnected() {
}
});Below is the logic of managing multiple items through arraylist and notifyList() method is used to reflect changes in list when it changes.
//note add unique product ids
//use same id for preference key
private static ArrayList<String> purchaseItemIDs = new ArrayList<String>() {{
add("p1");
add("p2");
add("p3");
}};
private static ArrayList<String> purchaseItemDisplay = new ArrayList<String>();
private SharedPreferences getPreferenceObject() {
return getApplicationContext().getSharedPreferences(PREF_FILE, 0);
}
private SharedPreferences.Editor getPreferenceEditObject() {
SharedPreferences pref = getApplicationContext().getSharedPreferences(PREF_FILE, 0);
return pref.edit();
}
private boolean getPurchaseItemValueFromPref(String PURCHASE_KEY){
return getPreferenceObject().getBoolean(PURCHASE_KEY,false);
}
private void savePurchaseItemValueToPref(String PURCHASE_KEY,boolean value){
getPreferenceEditObject().putBoolean(PURCHASE_KEY,value).commit();
}
private void notifyList(){
purchaseItemDisplay.clear();
for(String p:purchaseItemIDs){
purchaseItemDisplay.add("Purchase Status of "+p+" = "+getPurchaseItemValueFromPref(p));
}
arrayAdapter.notifyDataSetChanged();
}Whole Code
App level build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 30
buildToolsVersion "29.0.3"
defaultConfig {
applicationId "com.programtown.example"
minSdkVersion 17
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
implementation 'com.android.billingclient:billing:3.0.1'
}
Manifest File
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.programtown.example">
<uses-permission android:name="com.android.vending.BILLING" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</LinearLayout>MainActivity.java
package com.programtown.example;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.android.billingclient.api.AcknowledgePurchaseParams;
import com.android.billingclient.api.AcknowledgePurchaseResponseListener;
import com.android.billingclient.api.BillingClient;
import com.android.billingclient.api.BillingClientStateListener;
import com.android.billingclient.api.BillingFlowParams;
import com.android.billingclient.api.BillingResult;
import com.android.billingclient.api.ConsumeParams;
import com.android.billingclient.api.ConsumeResponseListener;
import com.android.billingclient.api.Purchase;
import com.android.billingclient.api.PurchasesUpdatedListener;
import com.android.billingclient.api.SkuDetails;
import com.android.billingclient.api.SkuDetailsParams;
import com.android.billingclient.api.SkuDetailsResponseListener;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static com.android.billingclient.api.BillingClient.SkuType.INAPP;
public class MainActivity extends AppCompatActivity implements PurchasesUpdatedListener {
public static final String PREF_FILE= "MyPref";
//note add unique product ids
//use same id for preference key
private static ArrayList<String> purchaseItemIDs = new ArrayList<String>() {{
add("p1");
add("p2");
add("p3");
}};
private static ArrayList<String> purchaseItemDisplay = new ArrayList<String>();
ArrayAdapter<String> arrayAdapter;
ListView listView;
private BillingClient billingClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView=(ListView) findViewById(R.id.listview);
// Establish connection to billing client
//check purchase status from google play store cache on every app start
billingClient = BillingClient.newBuilder(this)
.enablePendingPurchases().setListener(this).build();
billingClient.startConnection(new BillingClientStateListener() {
@Override
public void onBillingSetupFinished(@NonNull BillingResult billingResult) {
if(billingResult.getResponseCode()==BillingClient.BillingResponseCode.OK){
Purchase.PurchasesResult queryPurchase = billingClient.queryPurchases(INAPP);
List<Purchase> queryPurchases = queryPurchase.getPurchasesList();
if(queryPurchases!=null && queryPurchases.size()>0){
handlePurchases(queryPurchases);
}
//check which items are in purchase list and which are not in purchase list
//if items that are found add them to purchaseFound
//check status of found items and save values to preference
//item which are not found simply save false values to their preference
//indexOf return index of item in purchase list from 0-2 (because we have 3 items) else returns -1 if not found
ArrayList<Integer> purchaseFound =new ArrayList<Integer> ();
if(queryPurchases!=null && queryPurchases.size()>0){
//check item in purchase list
for(Purchase p:queryPurchases){
int index=purchaseItemIDs.indexOf(p.getSku());
//if purchase found
if(index>-1)
{
purchaseFound.add(index);
if(p.getPurchaseState() == Purchase.PurchaseState.PURCHASED)
{
savePurchaseItemValueToPref(purchaseItemIDs.get(index),true);
}
else{
savePurchaseItemValueToPref(purchaseItemIDs.get(index),false);
}
}
}
//items that are not found in purchase list mark false
//indexOf returns -1 when item is not in foundlist
for(int i=0;i < purchaseItemIDs.size(); i++){
if(purchaseFound.indexOf(i)==-1){
savePurchaseItemValueToPref(purchaseItemIDs.get(i),false);
}
}
}
//if purchase list is empty that means no item is not purchased
//Or purchase is refunded or canceled
//so mark them all false
else{
for( String purchaseItem: purchaseItemIDs ){
savePurchaseItemValueToPref(purchaseItem,false);
}
}
}
}
@Override
public void onBillingServiceDisconnected() {
}
});
arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, purchaseItemDisplay);
listView.setAdapter(arrayAdapter);
notifyList();
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
if(getPurchaseItemValueFromPref(purchaseItemIDs.get(position))){
Toast.makeText(getApplicationContext(),purchaseItemIDs.get(position)+" is Already Purchased",Toast.LENGTH_SHORT).show();
//selected item is already purchased
return;
}
//initiate purchase on selected product item click
//check if service is already connected
if (billingClient.isReady()) {
initiatePurchase(purchaseItemIDs.get(position));
}
//else reconnect service
else{
billingClient = BillingClient.newBuilder(MainActivity.this).enablePendingPurchases().setListener(MainActivity.this).build();
billingClient.startConnection(new BillingClientStateListener() {
@Override
public void onBillingSetupFinished(@NonNull BillingResult billingResult) {
if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
initiatePurchase(purchaseItemIDs.get(position));
} else {
Toast.makeText(getApplicationContext(),"Error "+billingResult.getDebugMessage(),Toast.LENGTH_SHORT).show();
}
}
@Override
public void onBillingServiceDisconnected() {
}
});
}
}
});
}
private void notifyList(){
purchaseItemDisplay.clear();
for(String p:purchaseItemIDs){
purchaseItemDisplay.add("Purchase Status of "+p+" = "+getPurchaseItemValueFromPref(p));
}
arrayAdapter.notifyDataSetChanged();
}
private SharedPreferences getPreferenceObject() {
return getApplicationContext().getSharedPreferences(PREF_FILE, 0);
}
private SharedPreferences.Editor getPreferenceEditObject() {
SharedPreferences pref = getApplicationContext().getSharedPreferences(PREF_FILE, 0);
return pref.edit();
}
private boolean getPurchaseItemValueFromPref(String PURCHASE_KEY){
return getPreferenceObject().getBoolean(PURCHASE_KEY,false);
}
private void savePurchaseItemValueToPref(String PURCHASE_KEY,boolean value){
getPreferenceEditObject().putBoolean(PURCHASE_KEY,value).commit();
}
private void initiatePurchase(final String PRODUCT_ID) {
List<String> skuList = new ArrayList<>();
skuList.add(PRODUCT_ID);
SkuDetailsParams.Builder params = SkuDetailsParams.newBuilder();
params.setSkusList(skuList).setType(INAPP);
billingClient.querySkuDetailsAsync(params.build(),
new SkuDetailsResponseListener() {
@Override
public void onSkuDetailsResponse(@NonNull BillingResult billingResult,
List<SkuDetails> skuDetailsList) {
if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
if (skuDetailsList != null && skuDetailsList.size() > 0) {
BillingFlowParams flowParams = BillingFlowParams.newBuilder()
.setSkuDetails(skuDetailsList.get(0))
.build();
billingClient.launchBillingFlow(MainActivity.this, flowParams);
}
else{
//try to add item/product id "p1" "p2" "p3" inside managed product in google play console
Toast.makeText(getApplicationContext(),"Purchase Item "+PRODUCT_ID+" not Found",Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(),
" Error "+billingResult.getDebugMessage(), Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public void onPurchasesUpdated(BillingResult billingResult, @Nullable List<Purchase> purchases) {
//if item newly purchased
if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK && purchases != null) {
handlePurchases(purchases);
}
//if item already purchased then check and reflect changes
else if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.ITEM_ALREADY_OWNED) {
Purchase.PurchasesResult queryAlreadyPurchasesResult = billingClient.queryPurchases(INAPP);
List<Purchase> alreadyPurchases = queryAlreadyPurchasesResult.getPurchasesList();
if(alreadyPurchases!=null){
handlePurchases(alreadyPurchases);
}
}
//if purchase cancelled
else if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.USER_CANCELED) {
Toast.makeText(getApplicationContext(),"Purchase Canceled",Toast.LENGTH_SHORT).show();
}
// Handle any other error msgs
else {
Toast.makeText(getApplicationContext(),"Error "+billingResult.getDebugMessage(),Toast.LENGTH_SHORT).show();
}
}
void handlePurchases(List<Purchase> purchases) {
for(Purchase purchase:purchases) {
final int index=purchaseItemIDs.indexOf(purchase.getSku());
//purchase found
if(index>-1) {
//if item is purchased
if (purchase.getPurchaseState() == Purchase.PurchaseState.PURCHASED)
{
if (!verifyValidSignature(purchase.getOriginalJson(), purchase.getSignature())) {
// Invalid purchase
// show error to user
Toast.makeText(getApplicationContext(), "Error : Invalid Purchase", Toast.LENGTH_SHORT).show();
continue;//skip current iteration only because other items in purchase list must be checked if present
}
// else purchase is valid
//if item is purchased and not Acknowledged
if (!purchase.isAcknowledged()) {
AcknowledgePurchaseParams acknowledgePurchaseParams =
AcknowledgePurchaseParams.newBuilder()
.setPurchaseToken(purchase.getPurchaseToken())
.build();
billingClient.acknowledgePurchase(acknowledgePurchaseParams,
new AcknowledgePurchaseResponseListener() {
@Override
public void onAcknowledgePurchaseResponse(BillingResult billingResult) {
if(billingResult.getResponseCode()==BillingClient.BillingResponseCode.OK){
//if purchase is acknowledged
//then saved value in preference
savePurchaseItemValueToPref(purchaseItemIDs.get(index),true);
Toast.makeText(getApplicationContext(), purchaseItemIDs.get(index)+" Item Purchased", Toast.LENGTH_SHORT).show();
notifyList();
}
}
});
}
//else item is purchased and also acknowledged
else {
// Grant entitlement to the user on item purchase
if(!getPurchaseItemValueFromPref(purchaseItemIDs.get(index))){
savePurchaseItemValueToPref(purchaseItemIDs.get(index),true);
Toast.makeText(getApplicationContext(), purchaseItemIDs.get(index)+" Item Purchased.", Toast.LENGTH_SHORT).show();
notifyList();
}
}
}
//if purchase is pending
else if( purchase.getPurchaseState() == Purchase.PurchaseState.PENDING)
{
Toast.makeText(getApplicationContext(),
purchaseItemIDs.get(index)+" Purchase is Pending. Please complete Transaction", Toast.LENGTH_SHORT).show();
}
//if purchase is refunded or unknown
else if( purchase.getPurchaseState() == Purchase.PurchaseState.UNSPECIFIED_STATE)
{
//mark purchase false in case of UNSPECIFIED_STATE
savePurchaseItemValueToPref(purchaseItemIDs.get(index),false);
Toast.makeText(getApplicationContext(), purchaseItemIDs.get(index)+" Purchase Status Unknown", Toast.LENGTH_SHORT).show();
notifyList();
}
}
}
}
/**
* Verifies that the purchase was signed correctly for this developer's public key.
* <p>Note: It's strongly recommended to perform such check on your backend since hackers can
* replace this method with "constant true" if they decompile/rebuild your app.
* </p>
*/
private boolean verifyValidSignature(String signedData, String signature) {
try {
//for old playconsole
// To get key go to Developer Console > Select your app > Development Tools > Services & APIs.
//for new play console
//To get key go to Developer Console > Select your app > Monetize > Monetization setup
String base64Key = "Add your key here";
return Security.verifyPurchase(base64Key, signedData, signature);
} catch (IOException e) {
return false;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(billingClient!=null){
billingClient.endConnection();
}
}
}
Security.java
/*
* Copyright (c) 2012 Google Inc.
*
* 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.
*/
package com.programtown.example;
import android.text.TextUtils;
import android.util.Base64;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
/**
* Security-related methods. For a secure implementation, all of this code should be implemented on
* a server that communicates with the application on the device.
*/
public class Security {
private static final String TAG = "IABUtil/Security";
private static final String KEY_FACTORY_ALGORITHM = "RSA";
private static final String SIGNATURE_ALGORITHM = "SHA1withRSA";
/**
* Verifies that the data was signed with the given signature, and returns the verified
* purchase.
* @param base64PublicKey the base64-encoded public key to use for verifying.
* @param signedData the signed JSON string (signed, not encrypted)
* @param signature the signature for the data, signed with the private key
* @throws IOException if encoding algorithm is not supported or key specification
* is invalid
*/
public static boolean verifyPurchase(String base64PublicKey, String signedData,
String signature) throws IOException {
if (TextUtils.isEmpty(signedData) || TextUtils.isEmpty(base64PublicKey)
|| TextUtils.isEmpty(signature)) {
//Purchase verification failed: missing data
return false;
}
PublicKey key = generatePublicKey(base64PublicKey);
return verify(key, signedData, signature);
}
/**
* Generates a PublicKey instance from a string containing the Base64-encoded public key.
*
* @param encodedPublicKey Base64-encoded public key
* @throws IOException if encoding algorithm is not supported or key specification
* is invalid
*/
public static PublicKey generatePublicKey(String encodedPublicKey) throws IOException {
try {
byte[] decodedKey = Base64.decode(encodedPublicKey, Base64.DEFAULT);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_FACTORY_ALGORITHM);
return keyFactory.generatePublic(new X509EncodedKeySpec(decodedKey));
} catch (NoSuchAlgorithmException e) {
// "RSA" is guaranteed to be available.
throw new RuntimeException(e);
} catch (InvalidKeySpecException e) {
String msg = "Invalid key specification: " + e;
throw new IOException(msg);
}
}
/**
* Verifies that the signature from the server matches the computed signature on the data.
* Returns true if the data is correctly signed.
*
* @param publicKey public key associated with the developer account
* @param signedData signed data from server
* @param signature server signature
* @return true if the data and signature match
*/
public static boolean verify(PublicKey publicKey, String signedData, String signature) {
byte[] signatureBytes;
try {
signatureBytes = Base64.decode(signature, Base64.DEFAULT);
} catch (IllegalArgumentException e) {
//Base64 decoding failed
return false;
}
try {
Signature signatureAlgorithm = Signature.getInstance(SIGNATURE_ALGORITHM);
signatureAlgorithm.initVerify(publicKey);
signatureAlgorithm.update(signedData.getBytes());
if (!signatureAlgorithm.verify(signatureBytes)) {
//Signature verification failed
return false;
}
return true;
} catch (NoSuchAlgorithmException e) {
// "RSA" is guaranteed to be available
throw new RuntimeException(e);
} catch (InvalidKeyException e) {
//Invalid key specification
} catch (SignatureException e) {
//Signature exception
}
return false;
}
}6 Run and Test the application
Now Run your app and test in app purchase by using your gmail account that is associated with your Google Console developer account. Because by default, the only test account registered is the one that’s associated with your developer account. You can register additional test accounts by using the Google Play Console.
Conclusion
So in this article we have learnt how to integrate and make in app purchase of multiple non consumable products. If you liked the article then please share this page and article. Thanks.
NOTE:
Need Support?
References:
https://developer.android.com/google/play/billing/billing_overview
Please Subscribe Youtube| Like Facebook | Follow Twitter
Great tutorials! Can you update to Google Billing 5.0?
here is the option to download latest code
https://programtown.com/android-google-in-app-purchase-subscription-download-example-source-code-google-play-billing-library-5-0-java-kotlin/
Thank you so much for publishing this!
Just a small notice:
billingClient.queryPurchases is deprecated
Do you know of any workaround?
It is due to Library version 4.
I have not done yet for version 4.
code is working fine for version 3
However for version 4 you can book order for personal support and implementation with latest library via Fiver.
https://www.fiverr.com/share/NEW6eN
Thanks
I have tried implementing your guides with in app subscriptions non consumables and now this method and keep getting Error Service connection is disconnected when I try to purchase items. Is this happening for any specific reason? I thought maybe it was because my device is logged in with my developer account, I’ve tried testing with a few apps I have on the Play Store that require in app purchases and still no success for over a week! I hope someone replies, as I’ve been stumped at this point.
Thanks
please recheck your code
However you can book order for personal support and implementation with latest library via Fiver.
https://www.fiverr.com/share/NEW6eN
Thanks
How to change it from list view to something like card view?
use card view for that