Add android aar build and connected device test

bindings/bdk-kotlin/android/build.gradle

@@ -0,0 +1,71 @@
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'maven-publish'
+
+android {
+    compileSdkVersion 30
+
+    defaultConfig {
+        minSdkVersion 21
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles 'consumer-rules.pro'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+afterEvaluate {
+
+    publishing {
+        publications {
+            // Creates a Maven publication called "release".
+            release(MavenPublication) {
+                // Applies the component for the release build variant.
+                from components.release
+
+                // You can then customize attributes of the publication as shown below.
+                groupId = 'org.bitcoindevkit'
+                artifactId = 'bdk'
+                version = '0.0.1-SNAPSHOT'
+            }
+            // Creates a Maven publication called “debug”.
+            debug(MavenPublication) {
+                // Applies the component for the debug build variant.
+                from components.debug
+
+                groupId = 'org.bitcoindevkit'
+                artifactId = 'bdk-debug'
+                version = '0.0.1-SNAPSHOT'
+            }
+        }
+    }
+}
+
+dependencies {
+    implementation(project(':jvm')) {
+        exclude group: 'net.java.dev.jna', module: 'jna'
+    }
+
+    implementation 'net.java.dev.jna:jna:5.8.0@aar'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+    implementation 'androidx.core:core-ktx:1.5.0'
+    api "org.slf4j:slf4j-api:1.7.30"
+
+    androidTestImplementation 'com.github.tony19:logback-android:2.0.0'
+    androidTestImplementation(project(':test-fixtures')) {
+        exclude group: 'net.java.dev.jna', module: 'jna'
+    }
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    androidTestImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.1'
+}

bindings/bdk-kotlin/android/proguard-rules.pro

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+# 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
+
+# for JNA
+-dontwarn java.awt.*
+-keep class com.sun.jna.* { *; }
+-keepclassmembers class * extends com.sun.jna.* { public *; }

bindings/bdk-kotlin/android/src/androidTest/assets/logback.xml

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+<configuration>
+  <appender name="logcat" class="ch.qos.logback.classic.android.LogcatAppender">
+    <tagEncoder>
+      <pattern>%logger{12}</pattern>
+    </tagEncoder>
+    <encoder>
+      <pattern>[%-20thread] %msg</pattern>
+    </encoder>
+  </appender>
+
+  <root level="DEBUG">
+    <appender-ref ref="logcat" />
+  </root>
+</configuration>

bindings/bdk-kotlin/android/src/androidTest/kotlin/org/bitcoindevkit/bdk/AndroidLibTest.kt

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+package org.bitcoindevkit.bdk
+
+import android.app.Application
+import android.content.Context.MODE_PRIVATE
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+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 AndroidLibTest : LibTest() {
+    override fun getTestDataDir(): String {
+        val context = ApplicationProvider.getApplicationContext<Application>()
+        return context.getDir("bdk-test", MODE_PRIVATE).toString()
+    }
+
+}

bindings/bdk-kotlin/android/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  package="org.bitcoindevkit.bdk">
+
+  <uses-permission android:name="android.permission.INTERNET" />
+
+</manifest>