Updated on 2026-08-14

2020-03-03 13:13:53 +00:00 · 2020-03-03 13:13:53 +00:00 · e3337df199
commit e3337df199
parent 11ea0b26ef 02af4471e3
26 changed files with 701 additions and 0 deletions
--- a/blockchain-demo/.gitignore
+++ b/blockchain-demo/.gitignore
@ -0,0 +1 @@
+/build
--- a/blockchain-demo/build.gradle
+++ b/blockchain-demo/build.gradle
@ -0,0 +1,63 @@
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-kapt'
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.2"
+
+
+    defaultConfig {
+        applicationId "com.example.blockchain_demo"
+        minSdkVersion 21
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    packagingOptions {
+        exclude 'lib/x86_64/darwin/libscrypt.dylib'
+        exclude 'lib/x86_64/freebsd/libscrypt.so'
+        exclude 'lib/x86_64/linux/libscrypt.so'
+    }
+
+    viewBinding {
+        enabled = true
+    }
+}
+
+dependencies {
+    implementation project(':tangem-core')
+    implementation project(':tangem-sdk')
+    implementation project(':blockchain')
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$versions.kotlin"
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.core:core-ktx:1.2.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'com.google.android.material:material:1.1.0'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3'
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-jdk8:1.3.3"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.3"
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}
--- a/blockchain-demo/proguard-rules.pro
+++ b/blockchain-demo/proguard-rules.pro
@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
--- a/blockchain-demo/src/androidTest/java/com/tangem/blockchain_demo/ExampleInstrumentedTest.kt
+++ b/blockchain-demo/src/androidTest/java/com/tangem/blockchain_demo/ExampleInstrumentedTest.kt
@ -0,0 +1,22 @@
+package com.tangem.blockchain_demo
+
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.example.blockchain_demo", appContext.packageName)
+    }
+}
--- a/blockchain-demo/src/main/AndroidManifest.xml
+++ b/blockchain-demo/src/main/AndroidManifest.xml
@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.tangem.blockchain_demo">
+
+    <uses-feature
+        android:name="android.hardware.nfc"
+        android:required="true" />
+    <uses-permission android:name="android.permission.NFC" />
+    <uses-permission android:name="android.permission.INTERNET" />
+
+
+    <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="com.tangem.blockchain_demo.BlockchainDemoActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.nfc.action.NDEF_DISCOVERED" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data
+                    android:host="www.tangem.com"
+                    android:scheme="http" />
+                <data
+                    android:host="www.tangem.com"
+                    android:scheme="https" />
+                <data
+                    android:host="tangem.com"
+                    android:scheme="http" />
+                <data
+                    android:host="tangem.com"
+                    android:scheme="https" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.nfc.action.TECH_DISCOVERED" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.nfc.action.TECH_DISCOVERED"
+                android:resource="@xml/nfc_tech_filter" />
+        </activity>
+    </application>
+
+</manifest>
--- a/blockchain-demo/src/main/java/com/tangem/blockchain_demo/BlockchainDemoActivity.kt
+++ b/blockchain-demo/src/main/java/com/tangem/blockchain_demo/BlockchainDemoActivity.kt
@ -0,0 +1,188 @@
+package com.tangem.blockchain_demo
+
+import android.os.Bundle
+import android.text.Editable
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import com.tangem.CardManager
+import com.tangem.blockchain.common.*
+import com.tangem.blockchain.common.extensions.Result
+import com.tangem.blockchain.common.extensions.Signer
+import com.tangem.blockchain.common.extensions.SimpleResult
+import com.tangem.blockchain_demo.databinding.ActivityBlockchainDemoBinding
+import com.tangem.commands.Card
+import com.tangem.tangem_sdk_new.extensions.init
+import com.tangem.tasks.ScanEvent
+import com.tangem.tasks.TaskError
+import com.tangem.tasks.TaskEvent
+import kotlinx.coroutines.*
+import java.math.BigDecimal
+import kotlin.coroutines.CoroutineContext
+
+class BlockchainDemoActivity : AppCompatActivity() {
+
+    private lateinit var cardManager: CardManager
+    private lateinit var signer: TransactionSigner
+    private lateinit var card: Card
+    private lateinit var walletManager: WalletManager
+    private var issuerDataCounter: Int = 1
+
+    private lateinit var fee: BigDecimal
+
+    private lateinit var binding: ActivityBlockchainDemoBinding
+
+    private val parentJob = Job()
+    private val exceptionHandler = CoroutineExceptionHandler { _, throwable ->
+        handleError(throwable.localizedMessage)
+    }
+    private val coroutineContext: CoroutineContext
+        get() = parentJob + Dispatchers.IO + exceptionHandler
+    private val scope = CoroutineScope(coroutineContext)
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        binding = ActivityBlockchainDemoBinding.inflate(layoutInflater)
+        val view = binding.root
+        setContentView(view)
+
+        cardManager = CardManager.init(this)
+        signer = Signer(cardManager)
+
+        binding.btnScan.setOnClickListener { scan() }
+
+        binding.btnCheckFee.setOnClickListener { requestFee() }
+
+        binding.btnSend.setOnClickListener { send() }
+    }
+
+
+    private fun scan() {
+        cardManager.scanCard { taskEvent ->
+            when (taskEvent) {
+                is TaskEvent.Event -> {
+                    when (taskEvent.data) {
+                        is ScanEvent.OnReadEvent -> {
+                            card = (taskEvent.data as ScanEvent.OnReadEvent).card
+                            walletManager = WalletManagerFactory.makeWalletManager(card)!!
+                            getInfo()
+                        }
+                    }
+                }
+                is TaskEvent.Completion -> {
+                    if (taskEvent.error != null) {
+                        if (taskEvent.error !is TaskError.UserCancelled) {
+                            handleError(taskEvent.error.toString())
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    private fun getInfo() {
+        scope.launch {
+            walletManager.update()
+            withContext(Dispatchers.Main) {
+                binding.tvBalance.text =
+                        "${walletManager.wallet.balances[AmountType.Coin]?.value
+                                ?: "error"} ${walletManager.blockchain.currency}"
+                val token = walletManager.wallet.balances[AmountType.Token]
+                if (token != null) {
+                    binding.tvBalance.text = token.currencySymbol + " " + token.value
+                    binding.etSumToSend.text = Editable.Factory.getInstance().newEditable(
+                            token.value.toString()
+                    )
+                } else {
+                    binding.etSumToSend.text =
+                            Editable.Factory.getInstance().newEditable(
+                                    walletManager.wallet.balances[AmountType.Coin]?.value.toString()
+                            )
+                }
+                binding.btnCheckFee.isEnabled = true
+            }
+        }
+    }
+
+    private fun requestFee() {
+        if (binding.etReceiverAddress.text.isBlank()) {
+            Toast.makeText(this, "Please enter receiver address", Toast.LENGTH_LONG).show()
+            return
+        } else if (binding.etSumToSend.text.isBlank()) {
+            Toast.makeText(this, "Choose sum to send", Toast.LENGTH_LONG).show()
+            return
+        }
+
+        scope.launch {
+            val feeResult = (walletManager as FeeProvider).getFee(
+                    walletManager.wallet.balances[AmountType.Token]
+                            ?: walletManager.wallet.balances[AmountType.Coin]!!,
+                    binding.etReceiverAddress.text.toString())
+            withContext(Dispatchers.Main) {
+                when (feeResult) {
+                    is Result.Failure -> {
+                        handleError(feeResult.error?.localizedMessage ?: "Error")
+                    }
+                    is Result.Success -> {
+                        binding.btnSend.isEnabled = true
+                        val fees = feeResult.data
+                        if (fees.size == 1) {
+                            binding.tvFee.text = fees[0].value.toString()
+                            fee = fees[0].value ?: BigDecimal(0)
+                        } else {
+                            binding.tvFee.text = fees[0].value.toString() + "\n" +
+                                    fees[1].value.toString() + "\n" +
+                                    fees[2].value.toString()
+                            fee = fees[1].value ?: BigDecimal(0)
+
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    private fun send() {
+        scope.launch {
+            val result = (walletManager as TransactionSender).send(
+                    formTransactionData(),
+                    signer)
+            withContext(Dispatchers.Main) {
+                when (result) {
+                    is SimpleResult.Failure -> {
+                        handleError(result.error?.localizedMessage ?: "Error")
+                    }
+                    is SimpleResult.Success -> {
+                        binding.tvFee.text = "Success"
+                    }
+                }
+            }
+        }
+    }
+
+    private fun formTransactionData(): TransactionData {
+        val amount = if (walletManager.wallet.balances[AmountType.Token] != null) {
+            walletManager.wallet.balances[AmountType.Token]!!
+        } else {
+            walletManager.wallet.balances[AmountType.Coin]!!.copy(
+                    value = binding.etSumToSend.text.toString().toBigDecimal() - fee
+            )
+        }
+        return TransactionData(
+                amount,
+                walletManager.wallet.balances[AmountType.Coin]!!.copy(value = fee),
+                walletManager.wallet.balances[AmountType.Coin]!!.address!!,
+                binding.etReceiverAddress.text.toString()
+        )
+    }
+
+    private fun handleError(error: String?) {
+        Toast.makeText(this, error, Toast.LENGTH_LONG).show()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        scope.cancel()
+    }
+}
--- a/blockchain-demo/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/blockchain-demo/src/main/res/drawable-v24/ic_launcher_foreground.xml
@ -0,0 +1,34 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>
--- a/blockchain-demo/src/main/res/drawable/ic_launcher_background.xml
+++ b/blockchain-demo/src/main/res/drawable/ic_launcher_background.xml
@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#008577"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
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+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>
--- a/blockchain-demo/src/main/res/layout/activity_blockchain_demo.xml
+++ b/blockchain-demo/src/main/res/layout/activity_blockchain_demo.xml
@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".BlockchainDemoActivity">
+
+    <TextView
+        android:id="@+id/tv_balance"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="48dp"
+        android:layout_marginBottom="80dp"
+        android:layout_weight="3"
+        android:padding="16dp"
+        android:textAlignment="center"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        android:textColor="@android:color/black"
+        android:textSize="26sp"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="BTC 0.500000034" />
+
+
+    <TextView
+        android:id="@+id/tv_fee"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="48dp"
+        android:padding="16dp"
+        android:paddingBottom="48dp"
+        android:textAlignment="center"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintBottom_toTopOf="@id/et_receiver_address"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        tools:text="MinFee: 200, Fee: 300, Priority: 400" />
+
+
+    <EditText
+        android:id="@+id/et_receiver_address"
+        android:layout_width="250dp"
+        android:layout_height="60dp"
+        android:hint="Send to:"
+        app:layout_constraintBottom_toTopOf="@id/et_sum_to_send"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent" />
+
+    <EditText
+        android:id="@+id/et_sum_to_send"
+        android:layout_width="250dp"
+        android:layout_height="60dp"
+        android:layout_marginBottom="32dp"
+        android:hint="Enter amount to send"
+        app:layout_constraintBottom_toTopOf="@id/btn_scan"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent" />
+
+    <Button
+        android:id="@+id/btn_scan"
+        android:layout_width="200dp"
+        android:layout_height="wrap_content"
+        android:text="Scan card and get info"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.6" />
+
+    <Button
+        android:id="@+id/btn_check_fee"
+        android:layout_width="200dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:enabled="false"
+        android:text="Check fee"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/btn_scan" />
+
+    <Button
+        android:id="@+id/btn_send"
+        android:layout_width="200dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:enabled="false"
+        android:text="Send transaction"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/btn_check_fee" />
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>
--- a/blockchain-demo/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/blockchain-demo/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/blockchain-demo/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/blockchain-demo/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/blockchain-demo/src/main/res/mipmap-hdpi/ic_launcher.png
+++ b/blockchain-demo/src/main/res/mipmap-hdpi/ic_launcher.png
--- a/blockchain-demo/src/main/res/mipmap-hdpi/ic_launcher_round.png
+++ b/blockchain-demo/src/main/res/mipmap-hdpi/ic_launcher_round.png
--- a/blockchain-demo/src/main/res/mipmap-mdpi/ic_launcher.png
+++ b/blockchain-demo/src/main/res/mipmap-mdpi/ic_launcher.png
--- a/blockchain-demo/src/main/res/mipmap-mdpi/ic_launcher_round.png
+++ b/blockchain-demo/src/main/res/mipmap-mdpi/ic_launcher_round.png
--- a/blockchain-demo/src/main/res/mipmap-xhdpi/ic_launcher.png
+++ b/blockchain-demo/src/main/res/mipmap-xhdpi/ic_launcher.png
--- a/blockchain-demo/src/main/res/mipmap-xhdpi/ic_launcher_round.png
+++ b/blockchain-demo/src/main/res/mipmap-xhdpi/ic_launcher_round.png
--- a/blockchain-demo/src/main/res/mipmap-xxhdpi/ic_launcher.png
+++ b/blockchain-demo/src/main/res/mipmap-xxhdpi/ic_launcher.png
--- a/blockchain-demo/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
+++ b/blockchain-demo/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
--- a/blockchain-demo/src/main/res/mipmap-xxxhdpi/ic_launcher.png
+++ b/blockchain-demo/src/main/res/mipmap-xxxhdpi/ic_launcher.png
--- a/blockchain-demo/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
+++ b/blockchain-demo/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
--- a/blockchain-demo/src/main/res/values/colors.xml
+++ b/blockchain-demo/src/main/res/values/colors.xml
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#527Aff</color>
+    <color name="colorPrimaryDark">#027AFF</color>
+    <color name="colorAccent">#027AFF</color>
+    <color name="fab">#4f98c0</color>
+</resources>
--- a/blockchain-demo/src/main/res/values/strings.xml
+++ b/blockchain-demo/src/main/res/values/strings.xml
@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Blockchain Demo</string>
+</resources>
--- a/blockchain-demo/src/main/res/values/styles.xml
+++ b/blockchain-demo/src/main/res/values/styles.xml
@ -0,0 +1,11 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+</resources>
--- a/blockchain-demo/src/main/res/xml/nfc_tech_filter.xml
+++ b/blockchain-demo/src/main/res/xml/nfc_tech_filter.xml
@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <tech-list>
+        <tech>android.nfc.tech.IsoDep</tech>
+        <tech>android.nfc.tech.Ndef</tech>
+        <tech>android.nfc.tech.NfcV</tech>
+    </tech-list>
+</resources>
--- a/blockchain-demo/src/test/java/com/tangem/blockchain_demo/ExampleUnitTest.kt
+++ b/blockchain-demo/src/test/java/com/tangem/blockchain_demo/ExampleUnitTest.kt
@ -0,0 +1,16 @@
+package com.tangem.blockchain_demo
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}