[flutter_tools] use less path manipulation in the Android SDK (#75930)

packages/flutter_tools/lib/src/android/android_sdk.dart

@@ -45,8 +45,8 @@ class AndroidSdk {
   static const String _javaHomeEnvironmentVariable = 'JAVA_HOME';
   static const String _javaExecutable = 'java';
 
-  /// The path to the Android SDK.
-  final String directory;
+  /// The Android SDK root directory.
+  final Directory directory;
 
   List<AndroidSdkVersion> _sdkVersions;
   AndroidSdkVersion _latestVersion;
@@ -57,9 +57,8 @@ class AndroidSdk {
   /// the expectation that it will be downloaded later, e.g. by gradle or the
   /// sdkmanager. The [licensesAvailable] property should be used to determine
   /// whether the licenses are at least possibly accepted.
-  bool get platformToolsAvailable =>
-    globals.fs.directory(globals.fs.path.join(directory, 'cmdline-tools')).existsSync() ||
-    globals.fs.directory(globals.fs.path.join(directory, 'platform-tools')).existsSync();
+  bool get platformToolsAvailable => directory.childDirectory('cmdline-tools').existsSync()
+     || directory.childDirectory('platform-tools').existsSync();
 
   /// Whether the `licenses` directory exists in the Android SDK.
   ///
@@ -68,7 +67,7 @@ class AndroidSdk {
   /// from another workstation such as in CI scenarios. If these files are valid
   /// gradle or the sdkmanager will be able to download and use other parts of
   /// the SDK on demand.
-  bool get licensesAvailable => globals.fs.directory(globals.fs.path.join(directory, 'licenses')).existsSync();
+  bool get licensesAvailable => directory.childDirectory('licenses').existsSync();
 
   static AndroidSdk locateAndroidSdk() {
     String findAndroidHomeDir() {
@@ -149,7 +148,7 @@ class AndroidSdk {
       return null;
     }
 
-    return AndroidSdk(androidHomeDir);
+    return AndroidSdk(globals.fs.directory(androidHomeDir));
   }
 
   static bool validSdkDirectory(String dir) {
@@ -200,7 +199,7 @@ class AndroidSdk {
     );
   }
 
-  Directory get _platformsDir => globals.fs.directory(globals.fs.path.join(directory, 'platforms'));
+  Directory get _platformsDir => directory.childDirectory('platforms');
 
   Iterable<Directory> get _platforms {
     Iterable<Directory> platforms = <Directory>[];
@@ -236,9 +235,13 @@ class AndroidSdk {
   }
 
   String getPlatformToolsPath(String binaryName) {
-    final String path = globals.fs.path.join(directory, 'platform-tools', binaryName);
-    if (globals.fs.file(path).existsSync()) {
-      return path;
+    final File cmdlineToolsBinary = directory.childDirectory('cmdline-tools').childFile(binaryName);
+    if (cmdlineToolsBinary.existsSync()) {
+      return cmdlineToolsBinary.path;
+    }
+    final File platformToolBinary = directory.childDirectory('platform-tools').childFile(binaryName);
+    if (platformToolBinary.existsSync()) {
+      return platformToolBinary.path;
     }
     return null;
   }
@@ -249,9 +252,9 @@ class AndroidSdk {
     // try both.
     final List<String> searchFolders = <String>['emulator', 'tools'];
     for (final String folder in searchFolders) {
-      final String path = globals.fs.path.join(directory, folder, binaryName);
-      if (globals.fs.file(path).existsSync()) {
-        return path;
+      final File file = directory.childDirectory(folder).childFile(binaryName);
+      if (file.existsSync()) {
+        return file.path;
       }
     }
     return null;
@@ -259,9 +262,9 @@ class AndroidSdk {
 
   String getAvdManagerPath() {
     final String binaryName = globals.platform.isWindows ? 'avdmanager.bat' : 'avdmanager';
-    final String path = globals.fs.path.join(directory, 'tools', 'bin', binaryName);
-    if (globals.fs.file(path).existsSync()) {
-      return path;
+    final File file = directory.childDirectory('tools').childDirectory('bin').childFile(binaryName);
+    if (file.existsSync()) {
+      return file.path;
     }
     return null;
   }
@@ -273,7 +276,7 @@ class AndroidSdk {
   void reinitialize() {
     List<Version> buildTools = <Version>[]; // 19.1.0, 22.0.1, ...
 
-    final Directory buildToolsDir = globals.fs.directory(globals.fs.path.join(directory, 'build-tools'));
+    final Directory buildToolsDir = directory.childDirectory('build-tools');
     if (buildToolsDir.existsSync()) {
       buildTools = buildToolsDir
         .listSync()
@@ -339,17 +342,22 @@ class AndroidSdk {
   /// The sdkmanager was previously in the tools directory but this component
   /// was marked as obsolete in 3.6.
   String get sdkManagerPath {
-    final File cmdlineTool = globals.fs.file(
-      globals.fs.path.join(directory, 'cmdline-tools', 'latest', 'bin',
-        globals.platform.isWindows
-          ? 'sdkmanager.bat'
-          : 'sdkmanager'
-      ),
-    );
+    final String executable = globals.platform.isWindows
+      ? 'sdkmanager.bat'
+      : 'sdkmanager';
+    final File cmdlineTool = directory
+      .childDirectory('cmdline-tools')
+      .childDirectory('latest')
+      .childDirectory('bin')
+      .childFile(executable);
     if (cmdlineTool.existsSync()) {
       return cmdlineTool.path;
     }
-    return globals.fs.path.join(directory, 'tools', 'bin', 'sdkmanager');
+    return directory
+      .childDirectory('tools')
+      .childDirectory('bin')
+      .childFile(executable)
+      .path;
   }
 
   /// First try Java bundled with Android Studio, then sniff JAVA_HOME, then fallback to PATH.
@@ -477,11 +485,11 @@ class AndroidSdkVersion implements Comparable<AndroidSdkVersion> {
   }
 
   String getPlatformsPath(String itemName) {
-    return _fileSystem.path.join(sdk.directory, 'platforms', platformName, itemName);
+    return sdk.directory.childDirectory('platforms').childDirectory(platformName).childFile(itemName).path;
   }
 
   String getBuildToolsPath(String binaryName) {
-    return _fileSystem.path.join(sdk.directory, 'build-tools', buildToolsVersionName, binaryName);
+   return sdk.directory.childDirectory('build-tools').childDirectory(buildToolsVersionName).childFile(binaryName).path;
   }
 
   @override

packages/flutter_tools/lib/src/android/android_workflow.dart

@@ -189,7 +189,7 @@ class AndroidValidator extends DoctorValidator {
       return ValidationResult(ValidationType.partial, messages);
     }
 
-    messages.add(ValidationMessage(_userMessages.androidSdkLocation(_androidSdk.directory)));
+    messages.add(ValidationMessage(_userMessages.androidSdkLocation(_androidSdk.directory?.path)));
 
     String sdkVersionText;
     if (_androidSdk.latestVersion != null) {

packages/flutter_tools/lib/src/android/gradle_utils.dart

@@ -240,7 +240,7 @@ void updateLocalProperties({
   }
 
   if (globals.androidSdk != null) {
-    changeIfNecessary('sdk.dir', globals.fsUtils.escapePath(globals.androidSdk.directory));
+    changeIfNecessary('sdk.dir', globals.fsUtils.escapePath(globals.androidSdk.directory.path));
   }
 
   changeIfNecessary('flutter.sdk', globals.fsUtils.escapePath(Cache.flutterRoot));
@@ -271,7 +271,7 @@ void updateLocalProperties({
 void writeLocalProperties(File properties) {
   final SettingsFile settings = SettingsFile();
   if (globals.androidSdk != null) {
-    settings.values['sdk.dir'] = globals.fsUtils.escapePath(globals.androidSdk.directory);
+    settings.values['sdk.dir'] = globals.fsUtils.escapePath(globals.androidSdk.directory.path);
   }
   settings.writeContents(properties);
 }

packages/flutter_tools/lib/src/commands/config.dart

@@ -180,7 +180,7 @@ class ConfigCommand extends FlutterCommand {
       results['android-studio-dir'] = androidStudio.directory;
     }
     if (results['android-sdk'] == null && globals.androidSdk != null) {
-      results['android-sdk'] = globals.androidSdk.directory;
+      results['android-sdk'] = globals.androidSdk.directory.path;
     }
 
     globals.printStatus(const JsonEncoder.withIndent('  ').convert(results));

packages/flutter_tools/test/commands.shard/hermetic/config_test.dart

@@ -10,6 +10,7 @@ import 'package:args/command_runner.dart';
 import 'package:flutter_tools/src/android/android_sdk.dart';
 import 'package:flutter_tools/src/android/android_studio.dart';
 import 'package:flutter_tools/src/base/context.dart';
+import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/build_info.dart';
 import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/commands/config.dart';
@@ -271,7 +272,7 @@ class MockAndroidStudio extends Mock implements AndroidStudio, Comparable<Androi
 
 class MockAndroidSdk extends Mock implements AndroidSdk {
   @override
-  String get directory => 'path/to/android/sdk';
+  Directory get directory => globals.fs.directory('path/to/android/sdk');
 }
 
 class MockFlutterVersion extends Mock implements FlutterVersion {}

packages/flutter_tools/test/commands.shard/permeable/build_aar_test.dart

@@ -227,7 +227,7 @@ void main() {
       when(mockProcessManager.canRun(any)).thenReturn(false);
 
       mockAndroidSdk = MockAndroidSdk();
-      when(mockAndroidSdk.directory).thenReturn('irrelevant');
+      when(mockAndroidSdk.directory).thenReturn(globals.fs.directory('irrelevant'));
     });
 
     tearDown(() {

packages/flutter_tools/test/commands.shard/permeable/build_apk_test.dart

@@ -174,7 +174,7 @@ void main() {
       });
 
       mockAndroidSdk = MockAndroidSdk();
-      when(mockAndroidSdk.directory).thenReturn('irrelevant');
+      when(mockAndroidSdk.directory).thenReturn(globals.fs.directory('irrelevant'));
     });
 
     tearDown(() {

packages/flutter_tools/test/commands.shard/permeable/build_appbundle_test.dart

@@ -154,7 +154,7 @@ void main() {
       when(mockAndroidSdk.licensesAvailable).thenReturn(true);
       when(mockAndroidSdk.platformToolsAvailable).thenReturn(true);
       when(mockAndroidSdk.validateSdkWellFormed()).thenReturn(const <String>[]);
-      when(mockAndroidSdk.directory).thenReturn('irrelevant');
+      when(mockAndroidSdk.directory).thenReturn(globals.fs.directory('irrelevant'));
     });
 
     tearDown(() {

packages/flutter_tools/test/general.shard/android/android_gradle_builder_test.dart

@@ -56,7 +56,7 @@ void main() {
         logger: logger,
       );
 
-      when(mockAndroidSdk.directory).thenReturn('irrelevant');
+      when(mockAndroidSdk.directory).thenReturn(fileSystem.directory('irrelevant'));
 
       final Directory rootDirectory = fileSystem.currentDirectory;
       cache = Cache.test(

packages/flutter_tools/test/general.shard/android/android_sdk_test.dart

@@ -73,10 +73,10 @@ void main() {
 
       final AndroidSdk sdk = AndroidSdk.locateAndroidSdk();
       fileSystem.file(
-        fileSystem.path.join(sdk.directory, 'cmdline-tools', 'latest', 'bin', 'sdkmanager')
+        fileSystem.path.join(sdk.directory.path, 'cmdline-tools', 'latest', 'bin', 'sdkmanager')
       ).createSync(recursive: true);
 
-      expect(sdk.sdkManagerPath, fileSystem.path.join(sdk.directory, 'cmdline-tools', 'latest', 'bin', 'sdkmanager'));
+      expect(sdk.sdkManagerPath, fileSystem.path.join(sdk.directory.path, 'cmdline-tools', 'latest', 'bin', 'sdkmanager'));
     }, overrides: <Type, Generator>{
       FileSystem: () => fileSystem,
       ProcessManager: () => FakeProcessManager.any(),
@@ -90,11 +90,11 @@ void main() {
 
       final AndroidSdk sdk = AndroidSdk.locateAndroidSdk();
       fileSystem.file(
-        fileSystem.path.join(sdk.directory, 'cmdline-tools', 'latest', 'bin', 'sdkmanager.bat')
+        fileSystem.path.join(sdk.directory.path, 'cmdline-tools', 'latest', 'bin', 'sdkmanager.bat')
       ).createSync(recursive: true);
 
       expect(sdk.sdkManagerPath,
-        fileSystem.path.join(sdk.directory, 'cmdline-tools', 'latest', 'bin', 'sdkmanager.bat'));
+        fileSystem.path.join(sdk.directory.path, 'cmdline-tools', 'latest', 'bin', 'sdkmanager.bat'));
     }, overrides: <Type, Generator>{
       FileSystem: () => fileSystem,
       ProcessManager: () => FakeProcessManager.any(),
@@ -102,17 +102,32 @@ void main() {
       Config: () => config,
     });
 
-    testUsingContext('returns sdkmanager path under tools if cmdline doesnt exist', () {
+    testUsingContext("returns sdkmanager path under tools if cmdline doesn't exist", () {
       sdkDir = MockAndroidSdk.createSdkDirectory();
       config.setValue('android-sdk', sdkDir.path);
 
       final AndroidSdk sdk = AndroidSdk.locateAndroidSdk();
 
-      expect(sdk.sdkManagerPath, fileSystem.path.join(sdk.directory, 'tools', 'bin', 'sdkmanager'));
+      expect(sdk.sdkManagerPath, fileSystem.path.join(sdk.directory.path, 'tools', 'bin', 'sdkmanager'));
     }, overrides: <Type, Generator>{
       FileSystem: () => fileSystem,
       ProcessManager: () => FakeProcessManager.any(),
       Config: () => config,
+      Platform: () => FakePlatform(operatingSystem: 'linux'),
+    });
+
+    testUsingContext("returns sdkmanager path under tools if cmdline doesn't exist on windows", () {
+      sdkDir = MockAndroidSdk.createSdkDirectory();
+      config.setValue('android-sdk', sdkDir.path);
+
+      final AndroidSdk sdk = AndroidSdk.locateAndroidSdk();
+
+      expect(sdk.sdkManagerPath, fileSystem.path.join(sdk.directory.path, 'tools', 'bin', 'sdkmanager.bat'));
+    }, overrides: <Type, Generator>{
+      FileSystem: () => fileSystem,
+      ProcessManager: () => FakeProcessManager.any(),
+      Config: () => config,
+      Platform: () => FakePlatform(operatingSystem: 'windows'),
     });
 
     testUsingContext('returns sdkmanager version', () {

packages/flutter_tools/test/general.shard/android/gradle_test.dart

@@ -841,7 +841,7 @@ flutter:
       fs = MemoryFileSystem.test();
       fakeProcessManager = FakeProcessManager.list(<FakeCommand>[]);
       mockAndroidSdk = MockAndroidSdk();
-      when(mockAndroidSdk.directory).thenReturn('irrelevant');
+      when(mockAndroidSdk.directory).thenReturn(fs.directory('irrelevant'));
       builder = AndroidGradleBuilder(logger: logger);
     });