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

 // Copyright 2015 The Chromium 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 'dart:async';
 import 'dart:collection';

 import 'package:meta/meta.dart';
 import 'package:xml/xml.dart' as xml;

 import 'android/android_sdk.dart';
 import 'android/gradle.dart';
 import 'base/file_system.dart';
 import 'base/os.dart' show os;
 import 'base/process.dart';
 import 'build_info.dart';
 import 'globals.dart';
 import 'ios/ios_workflow.dart';
 import 'ios/plist_utils.dart' as plist;
 import 'project.dart';
 import 'tester/flutter_tester.dart';

 abstract class ApplicationPackage {
   ApplicationPackage({ @required this.id })
     : assert(id != null);

   /// Package ID from the Android Manifest or equivalent.
   final String id;

   String get name;

   String get displayName => name;

   File get packagesFile => null;

   @override
   String toString() => displayName ?? id;
 }

 class AndroidApk extends ApplicationPackage {
   AndroidApk({
     String id,
     @required this.file,
     @required this.versionCode,
     @required this.launchActivity
   }) : assert(file != null),
        assert(launchActivity != null),
        super(id: id);

   /// Creates a new AndroidApk from an existing APK.
   factory AndroidApk.fromApk(File apk) {
     final String aaptPath = androidSdk?.latestVersion?.aaptPath;
     if (aaptPath == null) {
       printError('Unable to locate the Android SDK; please run \'flutter doctor\'.');
       return null;
     }

      final List<String> aaptArgs = <String>[
        aaptPath,
       'dump',
       'xmltree',
       apk.path,
       'AndroidManifest.xml',
     ];

     final ApkManifestData data = ApkManifestData
         .parseFromXmlDump(runCheckedSync(aaptArgs));

     if (data == null) {
       printError('Unable to read manifest info from ${apk.path}.');
       return null;
     }

     if (data.packageName == null || data.launchableActivityName == null) {
       printError('Unable to read manifest info from ${apk.path}.');
       return null;
     }

     return AndroidApk(
       id: data.packageName,
       file: apk,
       versionCode: int.tryParse(data.versionCode),
       launchActivity: '${data.packageName}/${data.launchableActivityName}'
     );
   }

   /// Path to the actual apk file.
   final File file;

   /// The path to the activity that should be launched.
   final String launchActivity;

   /// The version code of the APK.
   final int versionCode;

   /// Creates a new AndroidApk based on the information in the Android manifest.
   static Future<AndroidApk> fromAndroidProject(AndroidProject androidProject) async {
     File apkFile;

     if (androidProject.isUsingGradle) {
       apkFile = await getGradleAppOut(androidProject);
       if (apkFile.existsSync()) {
         // Grab information from the .apk. The gradle build script might alter
         // the application Id, so we need to look at what was actually built.
         return AndroidApk.fromApk(apkFile);
       }
       // The .apk hasn't been built yet, so we work with what we have. The run
       // command will grab a new AndroidApk after building, to get the updated
       // IDs.
     } else {
       apkFile = fs.file(fs.path.join(getAndroidBuildDirectory(), 'app.apk'));
     }

     final File manifest = androidProject.appManifestFile;

     if (!manifest.existsSync())
       return null;

     final String manifestString = manifest.readAsStringSync();
     final xml.XmlDocument document = xml.parse(manifestString);

     final Iterable<xml.XmlElement> manifests = document.findElements('manifest');
     if (manifests.isEmpty)
       return null;
     final String packageId = manifests.first.getAttribute('package');

     String launchActivity;
     for (xml.XmlElement category in document.findAllElements('category')) {
       if (category.getAttribute('android:name') == 'android.intent.category.LAUNCHER') {
         final xml.XmlElement activity = category.parent.parent;
         final String enabled = activity.getAttribute('android:enabled');
         if (enabled == null || enabled == 'true') {
           final String activityName = activity.getAttribute('android:name');
           launchActivity = '$packageId/$activityName';
           break;
         }
       }
     }

     if (packageId == null || launchActivity == null)
       return null;

     return AndroidApk(
       id: packageId,
       file: apkFile,
       versionCode: null,
       launchActivity: launchActivity
     );
   }

   @override
   File get packagesFile => file;

   @override
   String get name => file.basename;
 }

 /// Tests whether a [FileSystemEntity] is an iOS bundle directory
 bool _isBundleDirectory(FileSystemEntity entity) =>
     entity is Directory && entity.path.endsWith('.app');

 abstract class IOSApp extends ApplicationPackage {
   IOSApp({@required String projectBundleId}) : super(id: projectBundleId);

   /// Creates a new IOSApp from an existing app bundle or IPA.
   factory IOSApp.fromPrebuiltApp(FileSystemEntity applicationBinary) {
     final FileSystemEntityType entityType = fs.typeSync(applicationBinary.path);
     if (entityType == FileSystemEntityType.notFound) {
       printError(
           'File "${applicationBinary.path}" does not exist. Use an app bundle or an ipa.');
       return null;
     }
     Directory bundleDir;
     if (entityType == FileSystemEntityType.directory) {
       final Directory directory = fs.directory(applicationBinary);
       if (!_isBundleDirectory(directory)) {
         printError('Folder "${applicationBinary.path}" is not an app bundle.');
         return null;
       }
       bundleDir = fs.directory(applicationBinary);
     } else {
       // Try to unpack as an ipa.
       final Directory tempDir = fs.systemTempDirectory.createTempSync('flutter_app.');
       addShutdownHook(() async {
         await tempDir.delete(recursive: true);
       }, ShutdownStage.STILL_RECORDING);
       os.unzip(fs.file(applicationBinary), tempDir);
       final Directory payloadDir = fs.directory(
         fs.path.join(tempDir.path, 'Payload'),
       );
       if (!payloadDir.existsSync()) {
         printError(
             'Invalid prebuilt iOS ipa. Does not contain a "Payload" directory.');
         return null;
       }
       try {
         bundleDir = payloadDir.listSync().singleWhere(_isBundleDirectory);
       } on StateError {
         printError(
             'Invalid prebuilt iOS ipa. Does not contain a single app bundle.');
         return null;
       }
     }
     final String plistPath = fs.path.join(bundleDir.path, 'Info.plist');
     if (!fs.file(plistPath).existsSync()) {
       printError('Invalid prebuilt iOS app. Does not contain Info.plist.');
       return null;
     }
     final String id = iosWorkflow.getPlistValueFromFile(
       plistPath,
       plist.kCFBundleIdentifierKey,
     );
     if (id == null) {
       printError('Invalid prebuilt iOS app. Info.plist does not contain bundle identifier');
       return null;
     }

     return PrebuiltIOSApp(
       bundleDir: bundleDir,
       bundleName: fs.path.basename(bundleDir.path),
       projectBundleId: id,
     );
   }

   factory IOSApp.fromIosProject(IosProject project) {
     if (getCurrentHostPlatform() != HostPlatform.darwin_x64)
       return null;
     return BuildableIOSApp(project);
   }

   @override
   String get displayName => id;

   String get simulatorBundlePath;

   String get deviceBundlePath;
 }

 class BuildableIOSApp extends IOSApp {
   BuildableIOSApp(this.project) : super(projectBundleId: project.productBundleIdentifier);

   final IosProject project;

   @override
   String get name => project.hostAppBundleName;

   @override
   String get simulatorBundlePath => _buildAppPath('iphonesimulator');

   @override
   String get deviceBundlePath => _buildAppPath('iphoneos');

   String _buildAppPath(String type) {
     return fs.path.join(getIosBuildDirectory(), type, name);
   }
 }

 class PrebuiltIOSApp extends IOSApp {
   PrebuiltIOSApp({
     this.bundleDir,
     this.bundleName,
     @required String projectBundleId,
   }) : super(projectBundleId: projectBundleId);

   final Directory bundleDir;
   final String bundleName;

   @override
   String get name => bundleName;

   @override
   String get simulatorBundlePath => _bundlePath;

   @override
   String get deviceBundlePath => _bundlePath;

   String get _bundlePath => bundleDir.path;
 }

 Future<ApplicationPackage> getApplicationPackageForPlatform(
     TargetPlatform platform,
     {File applicationBinary}) async {
   switch (platform) {
     case TargetPlatform.android_arm:
     case TargetPlatform.android_arm64:
     case TargetPlatform.android_x64:
     case TargetPlatform.android_x86:
       return applicationBinary == null
           ? await AndroidApk.fromAndroidProject((await FlutterProject.current()).android)
           : AndroidApk.fromApk(applicationBinary);
     case TargetPlatform.ios:
       return applicationBinary == null
           ? IOSApp.fromIosProject((await FlutterProject.current()).ios)
           : IOSApp.fromPrebuiltApp(applicationBinary);
     case TargetPlatform.tester:
       return FlutterTesterApp.fromCurrentDirectory();
     case TargetPlatform.darwin_x64:
     case TargetPlatform.linux_x64:
     case TargetPlatform.windows_x64:
     case TargetPlatform.fuchsia:
       return null;
   }
   assert(platform != null);
   return null;
 }

 class ApplicationPackageStore {
   ApplicationPackageStore({ this.android, this.iOS });

   AndroidApk android;
   IOSApp iOS;

   Future<ApplicationPackage> getPackageForPlatform(TargetPlatform platform) async {
     switch (platform) {
       case TargetPlatform.android_arm:
       case TargetPlatform.android_arm64:
       case TargetPlatform.android_x64:
       case TargetPlatform.android_x86:
         android ??= await AndroidApk.fromAndroidProject((await FlutterProject.current()).android);
         return android;
       case TargetPlatform.ios:
         iOS ??= IOSApp.fromIosProject((await FlutterProject.current()).ios);
         return iOS;
       case TargetPlatform.darwin_x64:
       case TargetPlatform.linux_x64:
       case TargetPlatform.windows_x64:
       case TargetPlatform.fuchsia:
       case TargetPlatform.tester:
         return null;
     }
     return null;
   }
 }

 class _Entry {
   _Element parent;
   int level;
 }

 class _Element extends _Entry {
   _Element.fromLine(String line, _Element parent) {
     //      E: application (line=29)
     final List<String> parts = line.trimLeft().split(' ');
     name = parts[1];
     level = line.length - line.trimLeft().length;
     this.parent = parent;
     children = <_Entry>[];
   }

   List<_Entry> children;
   String name;

   void addChild(_Entry child) {
     children.add(child);
   }

   _Attribute firstAttribute(String name) {
     return children.firstWhere(
         (_Entry e) => e is _Attribute && e.key.startsWith(name),
         orElse: () => null,
     );
   }

   _Element firstElement(String name) {
     return children.firstWhere(
         (_Entry e) => e is _Element && e.name.startsWith(name),
         orElse: () => null,
     );
   }

   Iterable<_Entry> allElements(String name) {
     return children.where(
             (_Entry e) => e is _Element && e.name.startsWith(name));
   }
 }

 class _Attribute extends _Entry {
   _Attribute.fromLine(String line, _Element parent) {
     //     A: android:label(0x01010001)="hello_world" (Raw: "hello_world")
     const String attributePrefix = 'A: ';
     final List<String> keyVal = line
         .substring(line.indexOf(attributePrefix) + attributePrefix.length)
         .split('=');
     key = keyVal[0];
     value = keyVal[1];
     level = line.length - line.trimLeft().length;
     this.parent = parent;
   }

   String key;
   String value;
 }

 class ApkManifestData {
   ApkManifestData._(this._data);

   static ApkManifestData parseFromXmlDump(String data) {
     if (data == null || data.trim().isEmpty)
       return null;

     final List<String> lines = data.split('\n');
     assert(lines.length > 3);

     final _Element manifest = _Element.fromLine(lines[1], null);
     _Element currentElement = manifest;

     for (String line in lines.skip(2)) {
       final String trimLine = line.trimLeft();
       final int level = line.length - trimLine.length;

       // Handle level out
       while(level <= currentElement.level) {
         currentElement = currentElement.parent;
       }

       if (level > currentElement.level) {
         switch (trimLine[0]) {
           case 'A':
             currentElement
                 .addChild(_Attribute.fromLine(line, currentElement));
             break;
           case 'E':
             final _Element element = _Element.fromLine(line, currentElement);
             currentElement.addChild(element);
             currentElement = element;
         }
       }
     }

     final _Element application = manifest.firstElement('application');
     assert(application != null);

     final Iterable<_Entry> activities = application.allElements('activity');

     _Element launchActivity;
     for (_Element activity in activities) {
       final _Attribute enabled = activity.firstAttribute('android:enabled');
       if (enabled == null || enabled.value.contains('0xffffffff')) {
         launchActivity = activity;
         break;
       }
     }

     final _Attribute package = manifest.firstAttribute('package');
     // "io.flutter.examples.hello_world" (Raw: "io.flutter.examples.hello_world")
     final String packageName = package.value.substring(1, package.value.indexOf('" '));

     if (launchActivity == null) {
       printError('Error running $packageName. Default activity not found');
       return null;
     }

     final _Attribute nameAttribute = launchActivity.firstAttribute('android:name');
     // "io.flutter.examples.hello_world.MainActivity" (Raw: "io.flutter.examples.hello_world.MainActivity")
     final String activityName = nameAttribute
         .value.substring(1, nameAttribute.value.indexOf('" '));

     // Example format: (type 0x10)0x1
     final _Attribute versionCodeAttr = manifest.firstAttribute('android:versionCode');
     if (versionCodeAttr == null) {
       printError('Error running $packageName. Manifest versionCode not found');
       return null;
     }
     if (!versionCodeAttr.value.startsWith('(type 0x10)')) {
       printError('Error running $packageName. Manifest versionCode invalid');
       return null;
     }
     final int versionCode = int.tryParse(versionCodeAttr.value.substring(11));
     if (versionCode == null) {
       printError('Error running $packageName. Manifest versionCode invalid');
       return null;
     }

     final Map<String, Map<String, String>> map = <String, Map<String, String>>{};
     map['package'] = <String, String>{'name': packageName};
     map['version-code'] = <String, String>{'name': versionCode.toString()};
     map['launchable-activity'] = <String, String>{'name': activityName};

     return ApkManifestData._(map);
   }

   final Map<String, Map<String, String>> _data;

   @visibleForTesting
   Map<String, Map<String, String>> get data =>
       UnmodifiableMapView<String, Map<String, String>>(_data);

   String get packageName => _data['package'] == null ? null : _data['package']['name'];

   String get versionCode => _data['version-code'] == null ? null : _data['version-code']['name'];

   String get launchableActivityName {
     return _data['launchable-activity'] == null ? null : _data['launchable-activity']['name'];
   }

   @override
   String toString() => _data.toString();
 }
	// Copyright 2015 The Chromium 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 'dart:async';
	import 'dart:collection';

	import 'package:meta/meta.dart';
	import 'package:xml/xml.dart' as xml;

	import 'android/android_sdk.dart';
	import 'android/gradle.dart';
	import 'base/file_system.dart';
	import 'base/os.dart' show os;
	import 'base/process.dart';
	import 'build_info.dart';
	import 'globals.dart';
	import 'ios/ios_workflow.dart';
	import 'ios/plist_utils.dart' as plist;
	import 'project.dart';
	import 'tester/flutter_tester.dart';

	abstract class ApplicationPackage {
	ApplicationPackage({ @required this.id })
	: assert(id != null);

	/// Package ID from the Android Manifest or equivalent.
	final String id;

	String get name;

	String get displayName => name;

	File get packagesFile => null;

	@override
	String toString() => displayName ?? id;
	}

	class AndroidApk extends ApplicationPackage {
	AndroidApk({
	String id,
	@required this.file,
	@required this.versionCode,
	@required this.launchActivity
	}) : assert(file != null),
	assert(launchActivity != null),
	super(id: id);

	/// Creates a new AndroidApk from an existing APK.
	factory AndroidApk.fromApk(File apk) {
	final String aaptPath = androidSdk?.latestVersion?.aaptPath;
	if (aaptPath == null) {
	printError('Unable to locate the Android SDK; please run \'flutter doctor\'.');
	return null;
	}

	final List<String> aaptArgs = <String>[
	aaptPath,
	'dump',
	'xmltree',
	apk.path,
	'AndroidManifest.xml',
	];

	final ApkManifestData data = ApkManifestData
	.parseFromXmlDump(runCheckedSync(aaptArgs));

	if (data == null) {
	printError('Unable to read manifest info from ${apk.path}.');
	return null;
	}

	if (data.packageName == null \|\| data.launchableActivityName == null) {
	printError('Unable to read manifest info from ${apk.path}.');
	return null;
	}

	return AndroidApk(
	id: data.packageName,
	file: apk,
	versionCode: int.tryParse(data.versionCode),
	launchActivity: '${data.packageName}/${data.launchableActivityName}'
	);
	}

	/// Path to the actual apk file.
	final File file;

	/// The path to the activity that should be launched.
	final String launchActivity;

	/// The version code of the APK.
	final int versionCode;

	/// Creates a new AndroidApk based on the information in the Android manifest.
	static Future<AndroidApk> fromAndroidProject(AndroidProject androidProject) async {
	File apkFile;

	if (androidProject.isUsingGradle) {
	apkFile = await getGradleAppOut(androidProject);
	if (apkFile.existsSync()) {
	// Grab information from the .apk. The gradle build script might alter
	// the application Id, so we need to look at what was actually built.
	return AndroidApk.fromApk(apkFile);
	}
	// The .apk hasn't been built yet, so we work with what we have. The run
	// command will grab a new AndroidApk after building, to get the updated
	// IDs.
	} else {
	apkFile = fs.file(fs.path.join(getAndroidBuildDirectory(), 'app.apk'));
	}

	final File manifest = androidProject.appManifestFile;

	if (!manifest.existsSync())
	return null;

	final String manifestString = manifest.readAsStringSync();
	final xml.XmlDocument document = xml.parse(manifestString);

	final Iterable<xml.XmlElement> manifests = document.findElements('manifest');
	if (manifests.isEmpty)
	return null;
	final String packageId = manifests.first.getAttribute('package');

	String launchActivity;
	for (xml.XmlElement category in document.findAllElements('category')) {
	if (category.getAttribute('android:name') == 'android.intent.category.LAUNCHER') {
	final xml.XmlElement activity = category.parent.parent;
	final String enabled = activity.getAttribute('android:enabled');
	if (enabled == null \|\| enabled == 'true') {
	final String activityName = activity.getAttribute('android:name');
	launchActivity = '$packageId/$activityName';
	break;
	}
	}
	}

	if (packageId == null \|\| launchActivity == null)
	return null;

	return AndroidApk(
	id: packageId,
	file: apkFile,
	versionCode: null,
	launchActivity: launchActivity
	);
	}

	@override
	File get packagesFile => file;

	@override
	String get name => file.basename;
	}

	/// Tests whether a [FileSystemEntity] is an iOS bundle directory
	bool _isBundleDirectory(FileSystemEntity entity) =>
	entity is Directory && entity.path.endsWith('.app');

	abstract class IOSApp extends ApplicationPackage {
	IOSApp({@required String projectBundleId}) : super(id: projectBundleId);

	/// Creates a new IOSApp from an existing app bundle or IPA.
	factory IOSApp.fromPrebuiltApp(FileSystemEntity applicationBinary) {
	final FileSystemEntityType entityType = fs.typeSync(applicationBinary.path);
	if (entityType == FileSystemEntityType.notFound) {
	printError(
	'File "${applicationBinary.path}" does not exist. Use an app bundle or an ipa.');
	return null;
	}
	Directory bundleDir;
	if (entityType == FileSystemEntityType.directory) {
	final Directory directory = fs.directory(applicationBinary);
	if (!_isBundleDirectory(directory)) {
	printError('Folder "${applicationBinary.path}" is not an app bundle.');
	return null;
	}
	bundleDir = fs.directory(applicationBinary);
	} else {
	// Try to unpack as an ipa.
	final Directory tempDir = fs.systemTempDirectory.createTempSync('flutter_app.');
	addShutdownHook(() async {
	await tempDir.delete(recursive: true);
	}, ShutdownStage.STILL_RECORDING);
	os.unzip(fs.file(applicationBinary), tempDir);
	final Directory payloadDir = fs.directory(
	fs.path.join(tempDir.path, 'Payload'),
	);
	if (!payloadDir.existsSync()) {
	printError(
	'Invalid prebuilt iOS ipa. Does not contain a "Payload" directory.');
	return null;
	}
	try {
	bundleDir = payloadDir.listSync().singleWhere(_isBundleDirectory);
	} on StateError {
	printError(
	'Invalid prebuilt iOS ipa. Does not contain a single app bundle.');
	return null;
	}
	}
	final String plistPath = fs.path.join(bundleDir.path, 'Info.plist');
	if (!fs.file(plistPath).existsSync()) {
	printError('Invalid prebuilt iOS app. Does not contain Info.plist.');
	return null;
	}
	final String id = iosWorkflow.getPlistValueFromFile(
	plistPath,
	plist.kCFBundleIdentifierKey,
	);
	if (id == null) {
	printError('Invalid prebuilt iOS app. Info.plist does not contain bundle identifier');
	return null;
	}

	return PrebuiltIOSApp(
	bundleDir: bundleDir,
	bundleName: fs.path.basename(bundleDir.path),
	projectBundleId: id,
	);
	}

	factory IOSApp.fromIosProject(IosProject project) {
	if (getCurrentHostPlatform() != HostPlatform.darwin_x64)
	return null;
	return BuildableIOSApp(project);
	}

	@override
	String get displayName => id;

	String get simulatorBundlePath;

	String get deviceBundlePath;
	}

	class BuildableIOSApp extends IOSApp {
	BuildableIOSApp(this.project) : super(projectBundleId: project.productBundleIdentifier);

	final IosProject project;

	@override
	String get name => project.hostAppBundleName;

	@override
	String get simulatorBundlePath => _buildAppPath('iphonesimulator');

	@override
	String get deviceBundlePath => _buildAppPath('iphoneos');

	String _buildAppPath(String type) {
	return fs.path.join(getIosBuildDirectory(), type, name);
	}
	}

	class PrebuiltIOSApp extends IOSApp {
	PrebuiltIOSApp({
	this.bundleDir,
	this.bundleName,
	@required String projectBundleId,
	}) : super(projectBundleId: projectBundleId);

	final Directory bundleDir;
	final String bundleName;

	@override
	String get name => bundleName;

	@override
	String get simulatorBundlePath => _bundlePath;

	@override
	String get deviceBundlePath => _bundlePath;

	String get _bundlePath => bundleDir.path;
	}

	Future<ApplicationPackage> getApplicationPackageForPlatform(
	TargetPlatform platform,
	{File applicationBinary}) async {
	switch (platform) {
	case TargetPlatform.android_arm:
	case TargetPlatform.android_arm64:
	case TargetPlatform.android_x64:
	case TargetPlatform.android_x86:
	return applicationBinary == null
	? await AndroidApk.fromAndroidProject((await FlutterProject.current()).android)
	: AndroidApk.fromApk(applicationBinary);
	case TargetPlatform.ios:
	return applicationBinary == null
	? IOSApp.fromIosProject((await FlutterProject.current()).ios)
	: IOSApp.fromPrebuiltApp(applicationBinary);
	case TargetPlatform.tester:
	return FlutterTesterApp.fromCurrentDirectory();
	case TargetPlatform.darwin_x64:
	case TargetPlatform.linux_x64:
	case TargetPlatform.windows_x64:
	case TargetPlatform.fuchsia:
	return null;
	}
	assert(platform != null);
	return null;
	}

	class ApplicationPackageStore {
	ApplicationPackageStore({ this.android, this.iOS });

	AndroidApk android;
	IOSApp iOS;

	Future<ApplicationPackage> getPackageForPlatform(TargetPlatform platform) async {
	switch (platform) {
	case TargetPlatform.android_arm:
	case TargetPlatform.android_arm64:
	case TargetPlatform.android_x64:
	case TargetPlatform.android_x86:
	android ??= await AndroidApk.fromAndroidProject((await FlutterProject.current()).android);
	return android;
	case TargetPlatform.ios:
	iOS ??= IOSApp.fromIosProject((await FlutterProject.current()).ios);
	return iOS;
	case TargetPlatform.darwin_x64:
	case TargetPlatform.linux_x64:
	case TargetPlatform.windows_x64:
	case TargetPlatform.fuchsia:
	case TargetPlatform.tester:
	return null;
	}
	return null;
	}
	}

	class _Entry {
	_Element parent;
	int level;
	}

	class _Element extends _Entry {
	_Element.fromLine(String line, _Element parent) {
	// E: application (line=29)
	final List<String> parts = line.trimLeft().split(' ');
	name = parts[1];
	level = line.length - line.trimLeft().length;
	this.parent = parent;
	children = <_Entry>[];
	}

	List<_Entry> children;
	String name;

	void addChild(_Entry child) {
	children.add(child);
	}

	_Attribute firstAttribute(String name) {
	return children.firstWhere(
	(_Entry e) => e is _Attribute && e.key.startsWith(name),
	orElse: () => null,
	);
	}

	_Element firstElement(String name) {
	return children.firstWhere(
	(_Entry e) => e is _Element && e.name.startsWith(name),
	orElse: () => null,
	);
	}

	Iterable<_Entry> allElements(String name) {
	return children.where(
	(_Entry e) => e is _Element && e.name.startsWith(name));
	}
	}

	class _Attribute extends _Entry {
	_Attribute.fromLine(String line, _Element parent) {
	// A: android:label(0x01010001)="hello_world" (Raw: "hello_world")
	const String attributePrefix = 'A: ';
	final List<String> keyVal = line
	.substring(line.indexOf(attributePrefix) + attributePrefix.length)
	.split('=');
	key = keyVal[0];
	value = keyVal[1];
	level = line.length - line.trimLeft().length;
	this.parent = parent;
	}

	String key;
	String value;
	}

	class ApkManifestData {
	ApkManifestData._(this._data);

	static ApkManifestData parseFromXmlDump(String data) {
	if (data == null \|\| data.trim().isEmpty)
	return null;

	final List<String> lines = data.split('\n');
	assert(lines.length > 3);

	final _Element manifest = _Element.fromLine(lines[1], null);
	_Element currentElement = manifest;

	for (String line in lines.skip(2)) {
	final String trimLine = line.trimLeft();
	final int level = line.length - trimLine.length;

	// Handle level out
	while(level <= currentElement.level) {
	currentElement = currentElement.parent;
	}

	if (level > currentElement.level) {
	switch (trimLine[0]) {
	case 'A':
	currentElement
	.addChild(_Attribute.fromLine(line, currentElement));
	break;
	case 'E':
	final _Element element = _Element.fromLine(line, currentElement);
	currentElement.addChild(element);
	currentElement = element;
	}
	}
	}

	final _Element application = manifest.firstElement('application');
	assert(application != null);

	final Iterable<_Entry> activities = application.allElements('activity');

	_Element launchActivity;
	for (_Element activity in activities) {
	final _Attribute enabled = activity.firstAttribute('android:enabled');
	if (enabled == null \|\| enabled.value.contains('0xffffffff')) {
	launchActivity = activity;
	break;
	}
	}

	final _Attribute package = manifest.firstAttribute('package');
	// "io.flutter.examples.hello_world" (Raw: "io.flutter.examples.hello_world")
	final String packageName = package.value.substring(1, package.value.indexOf('" '));

	if (launchActivity == null) {
	printError('Error running $packageName. Default activity not found');
	return null;
	}

	final _Attribute nameAttribute = launchActivity.firstAttribute('android:name');
	// "io.flutter.examples.hello_world.MainActivity" (Raw: "io.flutter.examples.hello_world.MainActivity")
	final String activityName = nameAttribute
	.value.substring(1, nameAttribute.value.indexOf('" '));

	// Example format: (type 0x10)0x1
	final _Attribute versionCodeAttr = manifest.firstAttribute('android:versionCode');
	if (versionCodeAttr == null) {
	printError('Error running $packageName. Manifest versionCode not found');
	return null;
	}
	if (!versionCodeAttr.value.startsWith('(type 0x10)')) {
	printError('Error running $packageName. Manifest versionCode invalid');
	return null;
	}
	final int versionCode = int.tryParse(versionCodeAttr.value.substring(11));
	if (versionCode == null) {
	printError('Error running $packageName. Manifest versionCode invalid');
	return null;
	}

	final Map<String, Map<String, String>> map = <String, Map<String, String>>{};
	map['package'] = <String, String>{'name': packageName};
	map['version-code'] = <String, String>{'name': versionCode.toString()};
	map['launchable-activity'] = <String, String>{'name': activityName};

	return ApkManifestData._(map);
	}

	final Map<String, Map<String, String>> _data;

	@visibleForTesting
	Map<String, Map<String, String>> get data =>
	UnmodifiableMapView<String, Map<String, String>>(_data);

	String get packageName => _data['package'] == null ? null : _data['package']['name'];

	String get versionCode => _data['version-code'] == null ? null : _data['version-code']['name'];

	String get launchableActivityName {
	return _data['launchable-activity'] == null ? null : _data['launchable-activity']['name'];
	}

	@override
	String toString() => _data.toString();
	}