feat: add mobile platform build support

.gitignore

@@ -10,6 +10,12 @@ Cargo.lock
 **/.pub-cache/
 **/.pub/
 **/pubspec.lock
+**/local.properties
+**/GeneratedPluginRegistrant.*
+**/flutter_export_environment.sh
+**/Flutter-Generated.xcconfig
+**/Generated.xcconfig
+**/Flutter/ephemeral/
 
 # IDE
 .vscode/
@@ -26,6 +32,10 @@ Thumbs.db
 
 # Native libs built locally
 libbdkffi.*
+android/libs
+bdk_demo/android/app/src/main/jniLibs
+ios/Release/
+bdk_demo/ios/ios/
 test_output.txt
 test output.txt
 lib/bdk.dart

bdk_demo/.metadata

@@ -4,7 +4,7 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: "d7b523b356d15fb81e7d340bbe52b47f93937323"
+  revision: "f5a8537f90d143abd5bb2f658fa69c388da9677b"
   channel: "stable"
 
 project_type: app
@@ -13,11 +13,14 @@ project_type: app
 migration:
   platforms:
     - platform: root
-      create_revision: d7b523b356d15fb81e7d340bbe52b47f93937323
-      base_revision: d7b523b356d15fb81e7d340bbe52b47f93937323
+      create_revision: f5a8537f90d143abd5bb2f658fa69c388da9677b
+      base_revision: f5a8537f90d143abd5bb2f658fa69c388da9677b
+    - platform: android
+      create_revision: f5a8537f90d143abd5bb2f658fa69c388da9677b
+      base_revision: f5a8537f90d143abd5bb2f658fa69c388da9677b
     - platform: ios
-      create_revision: d7b523b356d15fb81e7d340bbe52b47f93937323
-      base_revision: d7b523b356d15fb81e7d340bbe52b47f93937323
+      create_revision: f5a8537f90d143abd5bb2f658fa69c388da9677b
+      base_revision: f5a8537f90d143abd5bb2f658fa69c388da9677b
 
   # User provided section
 

bdk_demo/android/.gitignore

@@ -0,0 +1,14 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+.cxx/
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/to/reference-keystore
+key.properties
+**/*.keystore
+**/*.jks

bdk_demo/android/app/build.gradle.kts

@@ -0,0 +1,44 @@
+plugins {
+    id("com.android.application")
+    id("kotlin-android")
+    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
+    id("dev.flutter.flutter-gradle-plugin")
+}
+
+android {
+    namespace = "com.example.bdk_demo"
+    compileSdk = flutter.compileSdkVersion
+    ndkVersion = flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_17.toString()
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId = "com.example.bdk_demo"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://flutter.dev/to/review-gradle-config.
+        minSdk = flutter.minSdkVersion
+        targetSdk = flutter.targetSdkVersion
+        versionCode = flutter.versionCode
+        versionName = flutter.versionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig = signingConfigs.getByName("debug")
+        }
+    }
+}
+
+flutter {
+    source = "../.."
+}

bdk_demo/android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

bdk_demo/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,45 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:label="bdk_demo"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:taskAffinity=""
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+    <!-- Required to query activities that can process text, see:
+         https://developer.android.com/training/package-visibility and
+         https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
+
+         In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.PROCESS_TEXT"/>
+            <data android:mimeType="text/plain"/>
+        </intent>
+    </queries>
+</manifest>

bdk_demo/android/app/src/main/kotlin/com/example/bdk_demo/MainActivity.kt

@@ -0,0 +1,137 @@
+package com.example.bdk_demo
+
+import android.os.Build
+import android.util.Log
+import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+import java.util.zip.ZipFile
+
+private const val CHANNEL = "bdk_demo/native_lib_dir"
+
+class MainActivity : FlutterActivity() {
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        super.configureFlutterEngine(flutterEngine)
+
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL)
+            .setMethodCallHandler { call, result ->
+                when (call.method) {
+                    "getNativeLibDir" -> {
+                        val path = findLibDirectory()
+                        if (path != null) {
+                            result.success(path)
+                        } else {
+                            result.error(
+                                "LIB_NOT_FOUND",
+                                "Could not locate libbdkffi.so in nativeLibraryDir",
+                                null
+                            )
+                        }
+                    }
+                    else -> result.notImplemented()
+                }
+            }
+    }
+
+    private fun findLibDirectory(): String? {
+        val info = applicationContext.applicationInfo
+        val nativeDirPath = info.nativeLibraryDir ?: return null
+        val baseDir = File(nativeDirPath)
+        if (!baseDir.exists()) {
+            Log.w("BDKDemo", "nativeLibraryDir does not exist: $nativeDirPath")
+            return null
+        }
+
+        val direct = File(baseDir, "libbdkffi.so")
+        if (direct.exists()) {
+            return baseDir.absolutePath
+        }
+
+        baseDir.listFiles()?.forEach { candidateDir ->
+            if (!candidateDir.isDirectory) return@forEach
+
+            val candidate = File(candidateDir, "libbdkffi.so")
+            if (candidate.exists()) {
+                return candidateDir.absolutePath
+            }
+
+            candidateDir.listFiles()?.forEach { nestedDir ->
+                if (!nestedDir.isDirectory) return@forEach
+                val nestedCandidate = File(nestedDir, "libbdkffi.so")
+                if (nestedCandidate.exists()) {
+                    return nestedDir.absolutePath
+                }
+
+                nestedDir.listFiles()?.forEach { innerDir ->
+                    if (!innerDir.isDirectory) return@forEach
+                    val innerCandidate = File(innerDir, "libbdkffi.so")
+                    if (innerCandidate.exists()) {
+                        return innerDir.absolutePath
+                    }
+                }
+            }
+        }
+
+        Build.SUPPORTED_ABIS?.forEach { abi ->
+            val candidateDir = File(baseDir, abi)
+            val candidate = File(candidateDir, "libbdkffi.so")
+            if (candidate.exists()) {
+                return candidateDir.absolutePath
+            }
+        }
+
+        val extracted = extractLibraryFromApk()
+        if (extracted != null) {
+            return extracted
+        }
+
+        return null
+    }
+
+    private fun extractLibraryFromApk(): String? {
+        val info = applicationContext.applicationInfo
+        val apkPath = info.sourceDir ?: return null
+        val supportedAbis = Build.SUPPORTED_ABIS ?: return null
+        val destRoot = File(applicationContext.filesDir, "bdk_native_libs")
+
+        if (!destRoot.exists() && !destRoot.mkdirs()) {
+            Log.w("BDKDemo", "Failed to create destination dir: ${destRoot.absolutePath}")
+            return null
+        }
+
+        try {
+            ZipFile(apkPath).use { zip ->
+                for (abi in supportedAbis) {
+                    val entryName = "lib/$abi/libbdkffi.so"
+                    val entry = zip.getEntry(entryName) ?: continue
+
+                    val abiDir = File(destRoot, abi)
+                    if (!abiDir.exists() && !abiDir.mkdirs()) {
+                        Log.w("BDKDemo", "Failed to create ABI dir: ${abiDir.absolutePath}")
+                        continue
+                    }
+
+                    val outputFile = File(abiDir, "libbdkffi.so")
+                    if (outputFile.exists()) {
+                        return abiDir.absolutePath
+                    }
+
+                    zip.getInputStream(entry).use { input ->
+                        FileOutputStream(outputFile).use { output ->
+                            input.copyTo(output)
+                        }
+                    }
+                    outputFile.setReadable(true, false)
+                    return abiDir.absolutePath
+                }
+            }
+        } catch (e: IOException) {
+            Log.e("BDKDemo", "Failed to extract libbdkffi.so", e)
+        }
+
+        return null
+    }
+}

bdk_demo/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

bdk_demo/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

bdk_demo/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

bdk_demo/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

bdk_demo/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>