build: refine Android build system and update dependencies

android/app/build.gradle

@@ -34,7 +34,7 @@ if (keystorePropertiesFile.exists()) {
 }
 
 android {
-    compileSdkVersion 33
+    compileSdkVersion Math.max(flutter.compileSdkVersion, 33)
     ndkVersion flutter.ndkVersion
 
     compileOptions {
@@ -51,11 +51,11 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "xyz.project.violet"
+
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
-        minSdkVersion 23
+        minSdkVersion Math.max(flutter.minSdkVersion, 23)
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
@@ -89,6 +89,6 @@ flutter {
 }
 
 dependencies {
-    implementation 'androidx.work:work-runtime:2.7.1' 
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'androidx.work:work-runtime:2.8.1'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
 }

android/app/src/main/kotlin/xyz/project/violet/MainActivity.kt

@@ -1,73 +1,87 @@
 package xyz.project.violet
 
-import android.app.Activity
-import android.net.VpnService
 import android.os.Build
 import android.os.Bundle
+import android.os.Environment
 import android.view.KeyEvent
 import android.view.View
 import android.view.WindowManager
-import androidx.annotation.NonNull
 import io.flutter.embedding.android.FlutterFragmentActivity
-import io.flutter.embedding.android.FlutterActivity
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugin.common.EventChannel
 import io.flutter.plugin.common.MethodChannel
+import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugins.GeneratedPluginRegistrant
 
-class MainActivity: FlutterFragmentActivity() {
-    private val CHANNEL = "xyz.project.violet/dpitunnel"
+class MainActivity : FlutterFragmentActivity() {
     private val VOLUME_CHANNEL = "xyz.project.violet/volume"
-    private val NATIVELIBDIR_CHANNEL = "xyz.project.violet/nativelibdir";
-    private var sink: EventChannel.EventSink? = null;
+    private val NATIVELIBDIR_CHANNEL = "xyz.project.violet/nativelibdir"
+    private val EXTERNAL_STORAGE_DIRECTORY_CHANNEL = "xyz.project.violet/externalStorageDirectory"
+
+    private val EXTERNAL_STORAGE_DIRECTORY_METHODS = mapOf(
+            "getExternalStorageDirectory" to MethodCallHandler { call, result ->
+                result.success(Environment.getExternalStorageDirectory().path)
+            },
+            "getExternalStorageDownloadsDirectory" to MethodCallHandler { call, result ->
+                result.success(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).path)
+            },
+    )
+
+    private var sink: EventChannel.EventSink? = null
 
     //
     // Source code from https://github.com/tommy351/eh-redux/commit/0f63f6090c91e06c4ef7241847fad173b4afad86
     //
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or
-                    View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
-            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION)
-            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
-        }
+        window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or
+                View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+        window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION)
+        window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P)
             window.attributes.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && this is Activity)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q)
             window.isNavigationBarContrastEnforced = false
     }
 
-    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
-        GeneratedPluginRegistrant.registerWith(flutterEngine);
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        GeneratedPluginRegistrant.registerWith(flutterEngine)
 
         EventChannel(flutterEngine.dartExecutor.binaryMessenger, VOLUME_CHANNEL).setStreamHandler(object : EventChannel.StreamHandler {
             override fun onListen(arguments: Any?, eventSink: EventChannel.EventSink?) {
-                sink = eventSink;
+                sink = eventSink
             }
 
             override fun onCancel(arguments: Any?) {
+                sink = null
             }
         })
 
-        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, NATIVELIBDIR_CHANNEL).setMethodCallHandler { 
-            call, result ->
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, NATIVELIBDIR_CHANNEL).setMethodCallHandler { call, result ->
             // Note: this method is invoked on the main thread.
             if (call.method == "getNativeDir") {
-                result.success(getApplicationContext().getApplicationInfo().nativeLibraryDir);
+                result.success(applicationContext.applicationInfo.nativeLibraryDir)
+            } else {
+                result.notImplemented()
+            }
+        }
+
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, EXTERNAL_STORAGE_DIRECTORY_CHANNEL).setMethodCallHandler { call, result ->
+            val method = EXTERNAL_STORAGE_DIRECTORY_METHODS[call.method]
+            if (method != null) {
+                method.onMethodCall(call, result)
             } else {
                 result.notImplemented()
             }
         }
     }
 
     override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
-        if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || keyCode == KeyEvent.KEYCODE_VOLUME_UP)
-        {
+        if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
             sink?.success(if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) "down" else "up")
-            return true;
+            return true
         }
 
         return super.onKeyDown(keyCode, event)

android/build.gradle

@@ -1,15 +1,16 @@
 buildscript {
-    ext.kotlin_version = '1.6.10'
+    ext.kotlin_version = '1.7.21'
+
     repositories {
         google()
         mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.1.2'
+        classpath 'com.android.tools.build:gradle:7.4.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath 'com.google.gms:google-services:4.3.10'
-        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.8.1'
+        classpath 'com.google.gms:google-services:4.4.0'
+        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.9.9'
     }
 }
 

android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip