Add package for Android socket permission check

packages/android_local_network/CHANGELOG.md

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+## 0.1.1
+
+* `AndroidLocalAreaSocket.connect` now automatically requests permission on first use.
+* Synchronized `AndroidLocalNetwork.requestPermission` to handle concurrent calls.
+
+## 0.1.0
+
+* Initial release.
+* Added `AndroidLocalNetwork` to check and request `ACCESS_LOCAL_NETWORK` permission.
+* Added `AndroidLocalAreaSocket` wrapper for `Socket.connect`.

packages/android_local_network/README.md

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+# android_local_network
+
+A Flutter package to handle the Android 17 Local Area Permission (`ACCESS_LOCAL_NETWORK`) for Dart sockets.
+
+## Usage
+
+Instead of using `Socket.connect` directly on Android 17+, use `AndroidLocalAreaSocket.connect`:
+
+```dart
+import 'package:android_local_network/android_local_network.dart';
+
+final socket = await AndroidLocalAreaSocket.connect('192.168.1.1', 8080);
+```
+
+Or check and request the permission manually:
+
+```dart
+import 'package:android_local_network/android_local_network.dart';
+
+if (await AndroidLocalNetwork.requestPermission()) {
+  // Permission granted
+}
+```
+
+## Implementation Details
+
+This package uses `jnigen` to interact with Android's permission system via FFI. This avoids the need for MethodChannels in the framework and provides a more direct way to handle permissions from Dart.

packages/android_local_network/android/build.gradle.kts

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+group = "com.example.android_local_network"
+version = "1.0-SNAPSHOT"
+
+plugins {
+    id("com.android.library")
+}
+
+android {
+    namespace = "com.example.android_local_network"
+    compileSdk = 35
+
+    defaultConfig {
+        minSdk = 24
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+}
+
+dependencies {
+    implementation("androidx.core:core:1.13.1")
+    implementation("io.flutter:flutter_embedding_debug:1.0.0-cafac705f02f2a77cd72743c41b33a0fa97714e0")
+}

packages/android_local_network/android/src/main/java/com/example/android_local_network/AndroidLocalNetworkPlugin.java

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+package com.example.android_local_network;
+
+import android.app.Activity;
+import android.content.pm.PackageManager;
+import androidx.annotation.NonNull;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+import io.flutter.embedding.engine.plugins.FlutterPlugin;
+import io.flutter.embedding.engine.plugins.activity.ActivityAware;
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
+import io.flutter.plugin.common.PluginRegistry;
+
+import android.os.Build;
+import android.util.Log;
+
+/**
+ * AndroidLocalNetwork handles the ACCESS_LOCAL_NETWORK permission.
+ * It can be used via jnigen to check and request permissions from Dart.
+ */
+public class AndroidLocalNetworkPlugin implements FlutterPlugin, ActivityAware, PluginRegistry.RequestPermissionsResultListener {
+    private static final String TAG = "AndroidLocalNetwork";
+    private static final String PERMISSION = "android.permission.ACCESS_LOCAL_NETWORK";
+    private static final int REQUEST_CODE = 4853; // Arbitrary request code
+
+    private Activity activity;
+    private PermissionCallback pendingCallback;
+
+    /**
+     * Interface for permission result callbacks.
+     */
+    public interface PermissionCallback {
+        void onResult(boolean granted);
+    }
+
+    private static AndroidLocalNetworkPlugin instance;
+
+    public static AndroidLocalNetworkPlugin getInstance() {
+        Log.d(TAG, "getInstance called, instance is " + (instance == null ? "null" : "not null"));
+        return instance;
+    }
+
+    @Override
+    public void onAttachedToEngine(@NonNull FlutterPluginBinding binding) {
+        Log.d(TAG, "onAttachedToEngine");
+        instance = this;
+    }
+
+    @Override
+    public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
+        Log.d(TAG, "onDetachedFromEngine");
+        if (instance == this) {
+            instance = null;
+        }
+    }
+
+    @Override
+    public void onAttachedToActivity(@NonNull ActivityPluginBinding binding) {
+        Log.d(TAG, "onAttachedToActivity");
+        this.activity = binding.getActivity();
+        binding.addRequestPermissionsResultListener(this);
+    }
+
+    @Override
+    public void onDetachedFromActivityForConfigChanges() {
+        Log.d(TAG, "onDetachedFromActivityForConfigChanges");
+        this.activity = null;
+    }
+
+    @Override
+    public void onReattachedToActivityForConfigChanges(@NonNull ActivityPluginBinding binding) {
+        Log.d(TAG, "onReattachedToActivityForConfigChanges");
+        this.activity = binding.getActivity();
+        binding.addRequestPermissionsResultListener(this);
+    }
+
+    @Override
+    public void onDetachedFromActivity() {
+        Log.d(TAG, "onDetachedFromActivity");
+        this.activity = null;
+    }
+
+    /**
+     * Checks if the local area permission is granted.
+     */
+    public boolean checkPermission() {
+        if (activity == null) {
+            Log.w(TAG, "checkPermission: activity is null");
+            return false;
+        }
+        try {
+            boolean granted = ContextCompat.checkSelfPermission(activity, PERMISSION) == PackageManager.PERMISSION_GRANTED;
+            Log.d(TAG, "checkPermission for " + PERMISSION + ": " + granted);
+            return granted;
+        } catch (Exception e) {
+            Log.e(TAG, "checkPermission error", e);
+            return false;
+        }
+    }
+
+    /**
+     * Requests the local area permission.
+     */
+    public void requestPermission(PermissionCallback callback) {
+        Log.d(TAG, "requestPermission called. Current API: " + Build.VERSION.SDK_INT);
+
+        if (activity == null) {
+            Log.w(TAG, "requestPermission: activity is null");
+            callback.onResult(false);
+            return;
+        }
+
+        if (checkPermission()) {
+            callback.onResult(true);
+            return;
+        }
+
+        pendingCallback = callback;
+        Log.d(TAG, "requestPermission: requesting from OS: " + PERMISSION);
+        ActivityCompat.requestPermissions(activity, new String[]{PERMISSION}, REQUEST_CODE);
+    }
+
+    @Override
+    public boolean onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        Log.d(TAG, "onRequestPermissionsResult: requestCode=" + requestCode);
+        if (requestCode == REQUEST_CODE) {
+            boolean granted = grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED;
+            Log.d(TAG, "onRequestPermissionsResult: granted=" + granted);
+            if (pendingCallback != null) {
+                pendingCallback.onResult(granted);
+                pendingCallback = null;
+            }
+            return true;
+        }
+        return false;
+    }
+}

packages/android_local_network/example/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.build/
+.buildlog/
+.history
+.svn/
+.swiftpm/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+/coverage/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

packages/android_local_network/example/.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "aa55a185405913779b327aa3d6c6639d2487642f"
+  channel: "master"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: aa55a185405913779b327aa3d6c6639d2487642f
+      base_revision: aa55a185405913779b327aa3d6c6639d2487642f
+    - platform: android
+      create_revision: aa55a185405913779b327aa3d6c6639d2487642f
+      base_revision: aa55a185405913779b327aa3d6c6639d2487642f
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

packages/android_local_network/example/README.md

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+# example
+
+A new Flutter project.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Learn Flutter](https://docs.flutter.dev/get-started/learn-flutter)
+- [Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
+- [Flutter learning resources](https://docs.flutter.dev/reference/learning-resources)
+
+For help getting started with Flutter development, view the
+[online documentation](https://docs.flutter.dev/), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.

packages/android_local_network/example/analysis_options.yaml

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+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at https://dart.dev/lints.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

packages/android_local_network/example/android/.gitignore

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+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

packages/android_local_network/example/android/app/build.gradle.kts

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+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.example"
+    compileSdk = 36
+    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.example"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://flutter.dev/to/review-gradle-config.
+        minSdk = 24
+        targetSdk = 36
+        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 = "../.."
+}

packages/android_local_network/example/android/app/src/debug/AndroidManifest.xml

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+<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>