Talk to your Credit Card part 7 (final app)

This app shows how to talk with a Credit Card and get information's like the Credit Card number, the card's expiration date and some other data.

The description can be found in an article series on medium.com: https://medium.com/@androidcrypto/talk-to-your-credit-card-part-7-find-and-print-out-the-application-primary-account-number-52b24b396082

general overview about the app
ask the card which applications are available on the card ("select PPSE")
analyze the card's response and identify one or more of the application number or application id ("AID")
select one application on the card to work with ("select AID") [or iterate through the applications and run the following steps for each application]
analyze the card's response to find out what data the card needs to proceed (find the "processing options data object list" (PDOL))
analyze the card's response and get the content of the element "application file locator" (AFL) list
read all files given in the AFL list and find the file where there are the elements "Application Primary Account Number" and "Application Expiration Date"
print out the "Application Primary Account Number" ("PAN") = card number and "Application Expiration Date" = expiration date of the card.

The app uses the NFC ReaderMode to get access to the card.

There are apps available for each step in my GitHub repository - the naming shows the step that has the code including this step.

This is the app for the (final) seventh step 7: find and print out the "Application Primary Account Number" ("PAN") = card number in TalkToYourCreditCardPart7.

The app is tested on real Android devices running Android versions 5.0.1, 8.0 and 13.

A compiled version of the app is available in the "debug-release" folder of this repository: app-debug.apk

These are the steps to read a payment card, it is a kind of "question & answer" workflow:

ask the card which applications are available on the card ("select PPSE")
analyze the card's response and identify one or more of the application number or application id ("AID")
select one application on the card to work with ("select AID") [or iterate through the applications and run the following steps for each application]
analyze the card's response to find out what data the card needs to proceed (find the "processing options data object list" (PDOL))
analyze the card's response and get the content of the element "application file locator" (AFL) list
read all files given in the AFL list and find the file where there are the elements "Application Primary Account Number" and "Application Expiration Date"
print out the "Application Primary Account Number" ("PAN") = card number and "Application Expiration Date" = expiration date of the card.

step 2: after reading a Credit Card

In AndroidManifest.xml grant these permissions:

    <uses-permission android:name="android.permission.NFC" />
    <uses-permission android:name="android.permission.VIBRATE" />

There are 3 dependencies necessary for the app to run:

build.gradle:

    // parsing BER-TLV encoded data, e.g. a credit card
    // source: https://github.com/evsinev/ber-tlv
    implementation 'com.payneteasy:ber-tlv:1.0-11'

    // pretty printing of card's responses
    // source: https://github.com/devnied/EMV-NFC-Paycard-Enrollment
    implementation 'com.github.devnied.emvnfccard:library:3.0.1'

    // implementing an about page
    implementation 'io.github.medyo:android-about-page:2.0.0'