packages/flutter_tools/lib/src/android/android_sdk.dart - mirrors/flutter - Git at Google

 // Copyright 2014 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'package:meta/meta.dart';

 import '../base/common.dart';
 import '../base/file_system.dart';
 import '../base/os.dart';
 import '../base/platform.dart';
 import '../base/process.dart';
 import '../base/version.dart';
 import '../convert.dart';
 import '../globals.dart' as globals;
 import 'android_studio.dart';

 // ANDROID_HOME is deprecated.
 // See https://developer.android.com/studio/command-line/variables.html#envar
 const String kAndroidHome = 'ANDROID_HOME';
 const String kAndroidSdkRoot = 'ANDROID_SDK_ROOT';

 final RegExp _numberedAndroidPlatformRe = RegExp(r'^android-([0-9]+)$');
 final RegExp _sdkVersionRe = RegExp(r'^ro.build.version.sdk=([0-9]+)$');

 /// Locate ADB. Prefer to use one from an Android SDK, if we can locate that.
 /// This should be used over accessing androidSdk.adbPath directly because it
 /// will work for those users who have Android Platform Tools installed but
 /// not the full SDK.
 String getAdbPath(AndroidSdk existingSdk) {
   if (existingSdk?.adbPath != null) {
     return existingSdk.adbPath;
   }
   if (existingSdk?.latestVersion == null) {
     return globals.os.which('adb')?.path;
   }
   return existingSdk?.adbPath;
 }

 // Android SDK layout:

 // $ANDROID_SDK_ROOT/platform-tools/adb

 // $ANDROID_SDK_ROOT/build-tools/19.1.0/aapt, dx, zipalign
 // $ANDROID_SDK_ROOT/build-tools/22.0.1/aapt
 // $ANDROID_SDK_ROOT/build-tools/23.0.2/aapt
 // $ANDROID_SDK_ROOT/build-tools/24.0.0-preview/aapt
 // $ANDROID_SDK_ROOT/build-tools/25.0.2/apksigner

 // $ANDROID_SDK_ROOT/platforms/android-22/android.jar
 // $ANDROID_SDK_ROOT/platforms/android-23/android.jar
 // $ANDROID_SDK_ROOT/platforms/android-N/android.jar
 class AndroidSdk {
   AndroidSdk(this.directory) {
     reinitialize();
   }

   static const String _javaHomeEnvironmentVariable = 'JAVA_HOME';
   static const String _javaExecutable = 'java';

   /// The path to the Android SDK.
   final String directory;

   List<AndroidSdkVersion> _sdkVersions;
   AndroidSdkVersion _latestVersion;

   /// Whether the `platform-tools` or `cmdline-tools` directory exists in the Android SDK.
   ///
   /// It is possible to have an Android SDK folder that is missing this with
   /// 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();

   /// Whether the `licenses` directory exists in the Android SDK.
   ///
   /// The existence of this folder normally indicates that the SDK licenses have
   /// been accepted, e.g. via the sdkmanager, Android Studio, or by copying them
   /// 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();

   static AndroidSdk locateAndroidSdk() {
     String findAndroidHomeDir() {
       String androidHomeDir;
       if (globals.config.containsKey('android-sdk')) {
         androidHomeDir = globals.config.getValue('android-sdk') as String;
       } else if (globals.platform.environment.containsKey(kAndroidHome)) {
         androidHomeDir = globals.platform.environment[kAndroidHome];
       } else if (globals.platform.environment.containsKey(kAndroidSdkRoot)) {
         androidHomeDir = globals.platform.environment[kAndroidSdkRoot];
       } else if (globals.platform.isLinux) {
         if (globals.fsUtils.homeDirPath != null) {
           androidHomeDir = globals.fs.path.join(
             globals.fsUtils.homeDirPath,
             'Android',
             'Sdk',
           );
         }
       } else if (globals.platform.isMacOS) {
         if (globals.fsUtils.homeDirPath != null) {
           androidHomeDir = globals.fs.path.join(
             globals.fsUtils.homeDirPath,
             'Library',
             'Android',
             'sdk',
           );
         }
       } else if (globals.platform.isWindows) {
         if (globals.fsUtils.homeDirPath != null) {
           androidHomeDir = globals.fs.path.join(
             globals.fsUtils.homeDirPath,
             'AppData',
             'Local',
             'Android',
             'sdk',
           );
         }
       }

       if (androidHomeDir != null) {
         if (validSdkDirectory(androidHomeDir)) {
           return androidHomeDir;
         }
         if (validSdkDirectory(globals.fs.path.join(androidHomeDir, 'sdk'))) {
           return globals.fs.path.join(androidHomeDir, 'sdk');
         }
       }

       // in build-tools/$version/aapt
       final List<File> aaptBins = globals.os.whichAll('aapt');
       for (File aaptBin in aaptBins) {
         // Make sure we're using the aapt from the SDK.
         aaptBin = globals.fs.file(aaptBin.resolveSymbolicLinksSync());
         final String dir = aaptBin.parent.parent.parent.path;
         if (validSdkDirectory(dir)) {
           return dir;
         }
       }

       // in platform-tools/adb
       final List<File> adbBins = globals.os.whichAll('adb');
       for (File adbBin in adbBins) {
         // Make sure we're using the adb from the SDK.
         adbBin = globals.fs.file(adbBin.resolveSymbolicLinksSync());
         final String dir = adbBin.parent.parent.path;
         if (validSdkDirectory(dir)) {
           return dir;
         }
       }

       return null;
     }

     final String androidHomeDir = findAndroidHomeDir();
     if (androidHomeDir == null) {
       // No dice.
       globals.printTrace('Unable to locate an Android SDK.');
       return null;
     }

     return AndroidSdk(androidHomeDir);
   }

   static bool validSdkDirectory(String dir) {
     return sdkDirectoryHasLicenses(dir) || sdkDirectoryHasPlatformTools(dir);
   }

   static bool sdkDirectoryHasPlatformTools(String dir) {
     return globals.fs.isDirectorySync(globals.fs.path.join(dir, 'platform-tools'));
   }

   static bool sdkDirectoryHasLicenses(String dir) {
     return globals.fs.isDirectorySync(globals.fs.path.join(dir, 'licenses'));
   }

   List<AndroidSdkVersion> get sdkVersions => _sdkVersions;

   AndroidSdkVersion get latestVersion => _latestVersion;

   String get adbPath => getPlatformToolsPath(globals.platform.isWindows ? 'adb.exe' : 'adb');

   String get emulatorPath => getEmulatorPath();

   String get avdManagerPath => getAvdManagerPath();

   /// Locate the path for storing AVD emulator images. Returns null if none found.
   String getAvdPath() {
     final List<String> searchPaths = <String>[
       globals.platform.environment['ANDROID_AVD_HOME'],
       if (globals.platform.environment['HOME'] != null)
         globals.fs.path.join(globals.platform.environment['HOME'], '.android', 'avd'),
     ];

     if (globals.platform.isWindows) {
       final String homeDrive = globals.platform.environment['HOMEDRIVE'];
       final String homePath = globals.platform.environment['HOMEPATH'];

       if (homeDrive != null && homePath != null) {
         // Can't use path.join for HOMEDRIVE/HOMEPATH
         // https://github.com/dart-lang/path/issues/37
         final String home = homeDrive + homePath;
         searchPaths.add(globals.fs.path.join(home, '.android', 'avd'));
       }
     }

     return searchPaths.where((String p) => p != null).firstWhere(
       (String p) => globals.fs.directory(p).existsSync(),
       orElse: () => null,
     );
   }

   Directory get _platformsDir => globals.fs.directory(globals.fs.path.join(directory, 'platforms'));

   Iterable<Directory> get _platforms {
     Iterable<Directory> platforms = <Directory>[];
     if (_platformsDir.existsSync()) {
       platforms = _platformsDir
         .listSync()
         .whereType<Directory>();
     }
     return platforms;
   }

   /// Validate the Android SDK. This returns an empty list if there are no
   /// issues; otherwise, it returns a list of issues found.
   List<String> validateSdkWellFormed() {
     if (adbPath == null || !globals.processManager.canRun(adbPath)) {
       return <String>['Android SDK file not found: ${adbPath ?? 'adb'}.'];
     }

     if (sdkVersions.isEmpty || latestVersion == null) {
       final StringBuffer msg = StringBuffer('No valid Android SDK platforms found in ${_platformsDir.path}.');
       if (_platforms.isEmpty) {
         msg.write(' Directory was empty.');
       } else {
         msg.write(' Candidates were:\n');
         msg.write(_platforms
           .map((Directory dir) => '  - ${dir.basename}')
           .join('\n'));
       }
       return <String>[msg.toString()];
     }

     return latestVersion.validateSdkWellFormed();
   }

   String getPlatformToolsPath(String binaryName) {
     final String path = globals.fs.path.join(directory, 'platform-tools', binaryName);
     if (globals.fs.file(path).existsSync()) {
       return path;
     }
     return null;
   }

   String getEmulatorPath() {
     final String binaryName = globals.platform.isWindows ? 'emulator.exe' : 'emulator';
     // Emulator now lives inside "emulator" but used to live inside "tools" so
     // 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;
       }
     }
     return null;
   }

   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;
     }
     return null;
   }

   /// Sets up various paths used internally.
   ///
   /// This method should be called in a case where the tooling may have updated
   /// SDK artifacts, such as after running a gradle build.
   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'));
     if (buildToolsDir.existsSync()) {
       buildTools = buildToolsDir
         .listSync()
         .map((FileSystemEntity entity) {
           try {
             return Version.parse(entity.basename);
           } on Exception {
             return null;
           }
         })
         .where((Version version) => version != null)
         .toList();
     }

     // Match up platforms with the best corresponding build-tools.
     _sdkVersions = _platforms.map<AndroidSdkVersion>((Directory platformDir) {
       final String platformName = platformDir.basename;
       int platformVersion;

       try {
         final Match numberedVersion = _numberedAndroidPlatformRe.firstMatch(platformName);
         if (numberedVersion != null) {
           platformVersion = int.parse(numberedVersion.group(1));
         } else {
           final String buildProps = platformDir.childFile('build.prop').readAsStringSync();
           final String versionString = const LineSplitter()
               .convert(buildProps)
               .map<Match>(_sdkVersionRe.firstMatch)
               .firstWhere((Match match) => match != null)
               .group(1);
           platformVersion = int.parse(versionString);
         }
       } on Exception {
         return null;
       }

       Version buildToolsVersion = Version.primary(buildTools.where((Version version) {
         return version.major == platformVersion;
       }).toList());

       buildToolsVersion ??= Version.primary(buildTools);

       if (buildToolsVersion == null) {
         return null;
       }

       return AndroidSdkVersion._(
         this,
         sdkLevel: platformVersion,
         platformName: platformName,
         buildToolsVersion: buildToolsVersion,
       );
     }).where((AndroidSdkVersion version) => version != null).toList();

     _sdkVersions.sort();

     _latestVersion = _sdkVersions.isEmpty ? null : _sdkVersions.last;
   }

   /// Returns the filesystem path of the Android SDK manager tool.
   ///
   /// 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'
       ),
     );
     if (cmdlineTool.existsSync()) {
       return cmdlineTool.path;
     }
     return globals.fs.path.join(directory, 'tools', 'bin', 'sdkmanager');
   }

   /// First try Java bundled with Android Studio, then sniff JAVA_HOME, then fallback to PATH.
   static String findJavaBinary({
     @required AndroidStudio androidStudio,
     @required FileSystem fileSystem,
     @required OperatingSystemUtils operatingSystemUtils,
     @required Platform platform,
   }) {
     if (androidStudio?.javaPath != null) {
       return fileSystem.path.join(androidStudio.javaPath, 'bin', 'java');
     }

     final String javaHomeEnv = platform.environment[_javaHomeEnvironmentVariable];
     if (javaHomeEnv != null) {
       // Trust JAVA_HOME.
       return fileSystem.path.join(javaHomeEnv, 'bin', 'java');
     }

     // MacOS specific logic to avoid popping up a dialog window.
     // See: http://stackoverflow.com/questions/14292698/how-do-i-check-if-the-java-jdk-is-installed-on-mac.
     if (platform.isMacOS) {
       try {
         final String javaHomeOutput = processUtils.runSync(
           <String>['/usr/libexec/java_home', '-v', '1.8'],
           throwOnError: true,
           hideStdout: true,
         ).stdout.trim();
         if (javaHomeOutput != null) {
           if ((javaHomeOutput != null) && (javaHomeOutput.isNotEmpty)) {
             final String javaHome = javaHomeOutput.split('\n').last.trim();
             return fileSystem.path.join(javaHome, 'bin', 'java');
           }
         }
       } on Exception catch (_) { /* ignore */ }
     }

     // Fallback to PATH based lookup.
     return operatingSystemUtils.which(_javaExecutable)?.path;
   }

   Map<String, String> _sdkManagerEnv;
   /// Returns an environment with the Java folder added to PATH for use in calling
   /// Java-based Android SDK commands such as sdkmanager and avdmanager.
   Map<String, String> get sdkManagerEnv {
     if (_sdkManagerEnv == null) {
       // If we can locate Java, then add it to the path used to run the Android SDK manager.
       _sdkManagerEnv = <String, String>{};
       final String javaBinary = findJavaBinary(
         androidStudio: globals.androidStudio,
         fileSystem: globals.fs,
         operatingSystemUtils: globals.os,
         platform: globals.platform,
       );
       if (javaBinary != null) {
         _sdkManagerEnv['PATH'] = globals.fs.path.dirname(javaBinary) +
                                  globals.os.pathVarSeparator +
                                  globals.platform.environment['PATH'];
       }
     }
     return _sdkManagerEnv;
   }

   /// Returns the version of the Android SDK manager tool or null if not found.
   String get sdkManagerVersion {
     if (!globals.processManager.canRun(sdkManagerPath)) {
       throwToolExit('Android sdkmanager not found. Update to the latest Android SDK to resolve this.');
     }
     final RunResult result = processUtils.runSync(
       <String>[sdkManagerPath, '--version'],
       environment: sdkManagerEnv,
     );
     if (result.exitCode != 0) {
       globals.printTrace('sdkmanager --version failed: exitCode: ${result.exitCode} stdout: ${result.stdout} stderr: ${result.stderr}');
       return null;
     }
     return result.stdout.trim();
   }

   @override
   String toString() => 'AndroidSdk: $directory';
 }

 class AndroidSdkVersion implements Comparable<AndroidSdkVersion> {
   AndroidSdkVersion._(
     this.sdk, {
     @required this.sdkLevel,
     @required this.platformName,
     @required this.buildToolsVersion,
   }) : assert(sdkLevel != null),
        assert(platformName != null),
        assert(buildToolsVersion != null);

   final AndroidSdk sdk;
   final int sdkLevel;
   final String platformName;
   final Version buildToolsVersion;

   String get buildToolsVersionName => buildToolsVersion.toString();

   String get androidJarPath => getPlatformsPath('android.jar');

   String get aaptPath => getBuildToolsPath('aapt');

   List<String> validateSdkWellFormed() {
     if (_exists(androidJarPath) != null) {
       return <String>[_exists(androidJarPath)];
     }

     if (_canRun(aaptPath) != null) {
       return <String>[_canRun(aaptPath)];
     }

     return <String>[];
   }

   String getPlatformsPath(String itemName) {
     return globals.fs.path.join(sdk.directory, 'platforms', platformName, itemName);
   }

   String getBuildToolsPath(String binaryName) {
     return globals.fs.path.join(sdk.directory, 'build-tools', buildToolsVersionName, binaryName);
   }

   @override
   int compareTo(AndroidSdkVersion other) => sdkLevel - other.sdkLevel;

   @override
   String toString() => '[${sdk.directory}, SDK version $sdkLevel, build-tools $buildToolsVersionName]';

   String _exists(String path) {
     if (!globals.fs.isFileSync(path)) {
       return 'Android SDK file not found: $path.';
     }
     return null;
   }

   String _canRun(String path) {
     if (!globals.processManager.canRun(path)) {
       return 'Android SDK file not found: $path.';
     }
     return null;
   }
 }
	// Copyright 2014 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'package:meta/meta.dart';

	import '../base/common.dart';
	import '../base/file_system.dart';
	import '../base/os.dart';
	import '../base/platform.dart';
	import '../base/process.dart';
	import '../base/version.dart';
	import '../convert.dart';
	import '../globals.dart' as globals;
	import 'android_studio.dart';

	// ANDROID_HOME is deprecated.
	// See https://developer.android.com/studio/command-line/variables.html#envar
	const String kAndroidHome = 'ANDROID_HOME';
	const String kAndroidSdkRoot = 'ANDROID_SDK_ROOT';

	final RegExp _numberedAndroidPlatformRe = RegExp(r'^android-([0-9]+)$');
	final RegExp _sdkVersionRe = RegExp(r'^ro.build.version.sdk=([0-9]+)$');

	/// Locate ADB. Prefer to use one from an Android SDK, if we can locate that.
	/// This should be used over accessing androidSdk.adbPath directly because it
	/// will work for those users who have Android Platform Tools installed but
	/// not the full SDK.
	String getAdbPath(AndroidSdk existingSdk) {
	if (existingSdk?.adbPath != null) {
	return existingSdk.adbPath;
	}
	if (existingSdk?.latestVersion == null) {
	return globals.os.which('adb')?.path;
	}
	return existingSdk?.adbPath;
	}

	// Android SDK layout:

	// $ANDROID_SDK_ROOT/platform-tools/adb

	// $ANDROID_SDK_ROOT/build-tools/19.1.0/aapt, dx, zipalign
	// $ANDROID_SDK_ROOT/build-tools/22.0.1/aapt
	// $ANDROID_SDK_ROOT/build-tools/23.0.2/aapt
	// $ANDROID_SDK_ROOT/build-tools/24.0.0-preview/aapt
	// $ANDROID_SDK_ROOT/build-tools/25.0.2/apksigner

	// $ANDROID_SDK_ROOT/platforms/android-22/android.jar
	// $ANDROID_SDK_ROOT/platforms/android-23/android.jar
	// $ANDROID_SDK_ROOT/platforms/android-N/android.jar
	class AndroidSdk {
	AndroidSdk(this.directory) {
	reinitialize();
	}

	static const String _javaHomeEnvironmentVariable = 'JAVA_HOME';
	static const String _javaExecutable = 'java';

	/// The path to the Android SDK.
	final String directory;

	List<AndroidSdkVersion> _sdkVersions;
	AndroidSdkVersion _latestVersion;

	/// Whether the `platform-tools` or `cmdline-tools` directory exists in the Android SDK.
	///
	/// It is possible to have an Android SDK folder that is missing this with
	/// 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();

	/// Whether the `licenses` directory exists in the Android SDK.
	///
	/// The existence of this folder normally indicates that the SDK licenses have
	/// been accepted, e.g. via the sdkmanager, Android Studio, or by copying them
	/// 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();

	static AndroidSdk locateAndroidSdk() {
	String findAndroidHomeDir() {
	String androidHomeDir;
	if (globals.config.containsKey('android-sdk')) {
	androidHomeDir = globals.config.getValue('android-sdk') as String;
	} else if (globals.platform.environment.containsKey(kAndroidHome)) {
	androidHomeDir = globals.platform.environment[kAndroidHome];
	} else if (globals.platform.environment.containsKey(kAndroidSdkRoot)) {
	androidHomeDir = globals.platform.environment[kAndroidSdkRoot];
	} else if (globals.platform.isLinux) {
	if (globals.fsUtils.homeDirPath != null) {
	androidHomeDir = globals.fs.path.join(
	globals.fsUtils.homeDirPath,
	'Android',
	'Sdk',
	);
	}
	} else if (globals.platform.isMacOS) {
	if (globals.fsUtils.homeDirPath != null) {
	androidHomeDir = globals.fs.path.join(
	globals.fsUtils.homeDirPath,
	'Library',
	'Android',
	'sdk',
	);
	}
	} else if (globals.platform.isWindows) {
	if (globals.fsUtils.homeDirPath != null) {
	androidHomeDir = globals.fs.path.join(
	globals.fsUtils.homeDirPath,
	'AppData',
	'Local',
	'Android',
	'sdk',
	);
	}
	}

	if (androidHomeDir != null) {
	if (validSdkDirectory(androidHomeDir)) {
	return androidHomeDir;
	}
	if (validSdkDirectory(globals.fs.path.join(androidHomeDir, 'sdk'))) {
	return globals.fs.path.join(androidHomeDir, 'sdk');
	}
	}

	// in build-tools/$version/aapt
	final List<File> aaptBins = globals.os.whichAll('aapt');
	for (File aaptBin in aaptBins) {
	// Make sure we're using the aapt from the SDK.
	aaptBin = globals.fs.file(aaptBin.resolveSymbolicLinksSync());
	final String dir = aaptBin.parent.parent.parent.path;
	if (validSdkDirectory(dir)) {
	return dir;
	}
	}

	// in platform-tools/adb
	final List<File> adbBins = globals.os.whichAll('adb');
	for (File adbBin in adbBins) {
	// Make sure we're using the adb from the SDK.
	adbBin = globals.fs.file(adbBin.resolveSymbolicLinksSync());
	final String dir = adbBin.parent.parent.path;
	if (validSdkDirectory(dir)) {
	return dir;
	}
	}

	return null;
	}

	final String androidHomeDir = findAndroidHomeDir();
	if (androidHomeDir == null) {
	// No dice.
	globals.printTrace('Unable to locate an Android SDK.');
	return null;
	}

	return AndroidSdk(androidHomeDir);
	}

	static bool validSdkDirectory(String dir) {
	return sdkDirectoryHasLicenses(dir) \|\| sdkDirectoryHasPlatformTools(dir);
	}

	static bool sdkDirectoryHasPlatformTools(String dir) {
	return globals.fs.isDirectorySync(globals.fs.path.join(dir, 'platform-tools'));
	}

	static bool sdkDirectoryHasLicenses(String dir) {
	return globals.fs.isDirectorySync(globals.fs.path.join(dir, 'licenses'));
	}

	List<AndroidSdkVersion> get sdkVersions => _sdkVersions;

	AndroidSdkVersion get latestVersion => _latestVersion;

	String get adbPath => getPlatformToolsPath(globals.platform.isWindows ? 'adb.exe' : 'adb');

	String get emulatorPath => getEmulatorPath();

	String get avdManagerPath => getAvdManagerPath();

	/// Locate the path for storing AVD emulator images. Returns null if none found.
	String getAvdPath() {
	final List<String> searchPaths = <String>[
	globals.platform.environment['ANDROID_AVD_HOME'],
	if (globals.platform.environment['HOME'] != null)
	globals.fs.path.join(globals.platform.environment['HOME'], '.android', 'avd'),
	];

	if (globals.platform.isWindows) {
	final String homeDrive = globals.platform.environment['HOMEDRIVE'];
	final String homePath = globals.platform.environment['HOMEPATH'];

	if (homeDrive != null && homePath != null) {
	// Can't use path.join for HOMEDRIVE/HOMEPATH
	// https://github.com/dart-lang/path/issues/37
	final String home = homeDrive + homePath;
	searchPaths.add(globals.fs.path.join(home, '.android', 'avd'));
	}
	}

	return searchPaths.where((String p) => p != null).firstWhere(
	(String p) => globals.fs.directory(p).existsSync(),
	orElse: () => null,
	);
	}

	Directory get _platformsDir => globals.fs.directory(globals.fs.path.join(directory, 'platforms'));

	Iterable<Directory> get _platforms {
	Iterable<Directory> platforms = <Directory>[];
	if (_platformsDir.existsSync()) {
	platforms = _platformsDir
	.listSync()
	.whereType<Directory>();
	}
	return platforms;
	}

	/// Validate the Android SDK. This returns an empty list if there are no
	/// issues; otherwise, it returns a list of issues found.
	List<String> validateSdkWellFormed() {
	if (adbPath == null \|\| !globals.processManager.canRun(adbPath)) {
	return <String>['Android SDK file not found: ${adbPath ?? 'adb'}.'];
	}

	if (sdkVersions.isEmpty \|\| latestVersion == null) {
	final StringBuffer msg = StringBuffer('No valid Android SDK platforms found in ${_platformsDir.path}.');
	if (_platforms.isEmpty) {
	msg.write(' Directory was empty.');
	} else {
	msg.write(' Candidates were:\n');
	msg.write(_platforms
	.map((Directory dir) => ' - ${dir.basename}')
	.join('\n'));
	}
	return <String>[msg.toString()];
	}

	return latestVersion.validateSdkWellFormed();
	}

	String getPlatformToolsPath(String binaryName) {
	final String path = globals.fs.path.join(directory, 'platform-tools', binaryName);
	if (globals.fs.file(path).existsSync()) {
	return path;
	}
	return null;
	}

	String getEmulatorPath() {
	final String binaryName = globals.platform.isWindows ? 'emulator.exe' : 'emulator';
	// Emulator now lives inside "emulator" but used to live inside "tools" so
	// 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;
	}
	}
	return null;
	}

	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;
	}
	return null;
	}

	/// Sets up various paths used internally.
	///
	/// This method should be called in a case where the tooling may have updated
	/// SDK artifacts, such as after running a gradle build.
	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'));
	if (buildToolsDir.existsSync()) {
	buildTools = buildToolsDir
	.listSync()
	.map((FileSystemEntity entity) {
	try {
	return Version.parse(entity.basename);
	} on Exception {
	return null;
	}
	})
	.where((Version version) => version != null)
	.toList();
	}

	// Match up platforms with the best corresponding build-tools.
	_sdkVersions = _platforms.map<AndroidSdkVersion>((Directory platformDir) {
	final String platformName = platformDir.basename;
	int platformVersion;

	try {
	final Match numberedVersion = _numberedAndroidPlatformRe.firstMatch(platformName);
	if (numberedVersion != null) {
	platformVersion = int.parse(numberedVersion.group(1));
	} else {
	final String buildProps = platformDir.childFile('build.prop').readAsStringSync();
	final String versionString = const LineSplitter()
	.convert(buildProps)
	.map<Match>(_sdkVersionRe.firstMatch)
	.firstWhere((Match match) => match != null)
	.group(1);
	platformVersion = int.parse(versionString);
	}
	} on Exception {
	return null;
	}

	Version buildToolsVersion = Version.primary(buildTools.where((Version version) {
	return version.major == platformVersion;
	}).toList());

	buildToolsVersion ??= Version.primary(buildTools);

	if (buildToolsVersion == null) {
	return null;
	}

	return AndroidSdkVersion._(
	this,
	sdkLevel: platformVersion,
	platformName: platformName,
	buildToolsVersion: buildToolsVersion,
	);
	}).where((AndroidSdkVersion version) => version != null).toList();

	_sdkVersions.sort();

	_latestVersion = _sdkVersions.isEmpty ? null : _sdkVersions.last;
	}

	/// Returns the filesystem path of the Android SDK manager tool.
	///
	/// 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'
	),
	);
	if (cmdlineTool.existsSync()) {
	return cmdlineTool.path;
	}
	return globals.fs.path.join(directory, 'tools', 'bin', 'sdkmanager');
	}

	/// First try Java bundled with Android Studio, then sniff JAVA_HOME, then fallback to PATH.
	static String findJavaBinary({
	@required AndroidStudio androidStudio,
	@required FileSystem fileSystem,
	@required OperatingSystemUtils operatingSystemUtils,
	@required Platform platform,
	}) {
	if (androidStudio?.javaPath != null) {
	return fileSystem.path.join(androidStudio.javaPath, 'bin', 'java');
	}

	final String javaHomeEnv = platform.environment[_javaHomeEnvironmentVariable];
	if (javaHomeEnv != null) {
	// Trust JAVA_HOME.
	return fileSystem.path.join(javaHomeEnv, 'bin', 'java');
	}

	// MacOS specific logic to avoid popping up a dialog window.
	// See: http://stackoverflow.com/questions/14292698/how-do-i-check-if-the-java-jdk-is-installed-on-mac.
	if (platform.isMacOS) {
	try {
	final String javaHomeOutput = processUtils.runSync(
	<String>['/usr/libexec/java_home', '-v', '1.8'],
	throwOnError: true,
	hideStdout: true,
	).stdout.trim();
	if (javaHomeOutput != null) {
	if ((javaHomeOutput != null) && (javaHomeOutput.isNotEmpty)) {
	final String javaHome = javaHomeOutput.split('\n').last.trim();
	return fileSystem.path.join(javaHome, 'bin', 'java');
	}
	}
	} on Exception catch (_) { /* ignore */ }
	}

	// Fallback to PATH based lookup.
	return operatingSystemUtils.which(_javaExecutable)?.path;
	}

	Map<String, String> _sdkManagerEnv;
	/// Returns an environment with the Java folder added to PATH for use in calling
	/// Java-based Android SDK commands such as sdkmanager and avdmanager.
	Map<String, String> get sdkManagerEnv {
	if (_sdkManagerEnv == null) {
	// If we can locate Java, then add it to the path used to run the Android SDK manager.
	_sdkManagerEnv = <String, String>{};
	final String javaBinary = findJavaBinary(
	androidStudio: globals.androidStudio,
	fileSystem: globals.fs,
	operatingSystemUtils: globals.os,
	platform: globals.platform,
	);
	if (javaBinary != null) {
	_sdkManagerEnv['PATH'] = globals.fs.path.dirname(javaBinary) +
	globals.os.pathVarSeparator +
	globals.platform.environment['PATH'];
	}
	}
	return _sdkManagerEnv;
	}

	/// Returns the version of the Android SDK manager tool or null if not found.
	String get sdkManagerVersion {
	if (!globals.processManager.canRun(sdkManagerPath)) {
	throwToolExit('Android sdkmanager not found. Update to the latest Android SDK to resolve this.');
	}
	final RunResult result = processUtils.runSync(
	<String>[sdkManagerPath, '--version'],
	environment: sdkManagerEnv,
	);
	if (result.exitCode != 0) {
	globals.printTrace('sdkmanager --version failed: exitCode: ${result.exitCode} stdout: ${result.stdout} stderr: ${result.stderr}');
	return null;
	}
	return result.stdout.trim();
	}

	@override
	String toString() => 'AndroidSdk: $directory';
	}

	class AndroidSdkVersion implements Comparable<AndroidSdkVersion> {
	AndroidSdkVersion._(
	this.sdk, {
	@required this.sdkLevel,
	@required this.platformName,
	@required this.buildToolsVersion,
	}) : assert(sdkLevel != null),
	assert(platformName != null),
	assert(buildToolsVersion != null);

	final AndroidSdk sdk;
	final int sdkLevel;
	final String platformName;
	final Version buildToolsVersion;

	String get buildToolsVersionName => buildToolsVersion.toString();

	String get androidJarPath => getPlatformsPath('android.jar');

	String get aaptPath => getBuildToolsPath('aapt');

	List<String> validateSdkWellFormed() {
	if (_exists(androidJarPath) != null) {
	return <String>[_exists(androidJarPath)];
	}

	if (_canRun(aaptPath) != null) {
	return <String>[_canRun(aaptPath)];
	}

	return <String>[];
	}

	String getPlatformsPath(String itemName) {
	return globals.fs.path.join(sdk.directory, 'platforms', platformName, itemName);
	}

	String getBuildToolsPath(String binaryName) {
	return globals.fs.path.join(sdk.directory, 'build-tools', buildToolsVersionName, binaryName);
	}

	@override
	int compareTo(AndroidSdkVersion other) => sdkLevel - other.sdkLevel;

	@override
	String toString() => '[${sdk.directory}, SDK version $sdkLevel, build-tools $buildToolsVersionName]';

	String _exists(String path) {
	if (!globals.fs.isFileSync(path)) {
	return 'Android SDK file not found: $path.';
	}
	return null;
	}

	String _canRun(String path) {
	if (!globals.processManager.canRun(path)) {
	return 'Android SDK file not found: $path.';
	}
	return null;
	}
	}