Updated androidMissingSdkInstructions error message (flutter#65964)

Author: DanielEdrisian

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

@@ -167,7 +167,7 @@ class AndroidValidator extends DoctorValidator {
       } else {
         // Instruct user to set [kAndroidSdkRoot] and not deprecated [kAndroidHome]
         // See https://github.com/flutter/flutter/issues/39301
-        messages.add(ValidationMessage.error(_userMessages.androidMissingSdkInstructions(kAndroidSdkRoot, _platform)));
+        messages.add(ValidationMessage.error(_userMessages.androidMissingSdkInstructions(_platform)));
       }
       return ValidationResult(ValidationType.missing, messages);
     }
@@ -198,7 +198,7 @@ class AndroidValidator extends DoctorValidator {
         _androidSdk.latestVersion.platformName,
         _androidSdk.latestVersion.buildToolsVersionName)));
     } else {
-      messages.add(ValidationMessage.error(_userMessages.androidMissingSdkInstructions(kAndroidHome, _platform)));
+      messages.add(ValidationMessage.error(_userMessages.androidMissingSdkInstructions(_platform)));
     }
 
     if (_platform.environment.containsKey(kAndroidHome)) {

packages/flutter_tools/lib/src/base/user_messages.dart

@@ -69,13 +69,13 @@ class UserMessages {
   String androidBadSdkDir(String envKey, String homeDir) =>
       '$envKey = $homeDir\n'
       'but Android SDK not found at this location.';
-  String androidMissingSdkInstructions(String envKey, Platform platform) =>
+  String androidMissingSdkInstructions(Platform platform) =>
       'Unable to locate Android SDK.\n'
       'Install Android Studio from: https://developer.android.com/studio/index.html\n'
       'On first launch it will assist you in installing the Android SDK components.\n'
       '(or visit ${_androidSdkInstallUrl(platform)} for detailed instructions).\n'
-      'If the Android SDK has been installed to a custom location, set $envKey to that location.\n'
-      'You may also want to add it to your PATH environment variable.\n';
+      'If the Android SDK has been installed to a custom location, please use\n'
+      '`flutter config --android-sdk` to update to that location.\n';
   String androidSdkLocation(String directory) => 'Android SDK at $directory';
   String androidSdkPlatformToolsVersion(String platform, String tools) =>
       'Platform $platform, build-tools $tools';

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

@@ -329,9 +329,15 @@ void main() {
       validationResult.messages.last.message,
       errorMessage,
     );
+    expect(
+      validationResult.messages.any(
+        (ValidationMessage message) => message.message.contains('Unable to locate Android SDK')
+      ),
+      false,
+    );
   });
 
-  testWithoutContext('Mentions `kAndroidSdkRoot if user has no AndroidSdk`', () async {
+  testWithoutContext('Mentions `flutter config --android-sdk if user has no AndroidSdk`', () async {
     final ValidationResult validationResult = await AndroidValidator(
       androidSdk: null,
       androidStudio: null,
@@ -343,7 +349,7 @@ void main() {
     ).validate();
     expect(
       validationResult.messages.any(
-        (ValidationMessage message) => message.message.contains(kAndroidSdkRoot)
+        (ValidationMessage message) => message.message.contains('flutter config --android-sdk')
       ),
       true,
     );

packages/flutter_tools/test/general.shard/base/user_messages_test.dart

@@ -23,7 +23,7 @@ void main() {
 
   testWithoutContext('Android installation instructions', () {
     final UserMessages userMessages = UserMessages();
-    _checkInstallationURL((Platform platform) => userMessages.androidMissingSdkInstructions('ANDROID_SDK_ROOT', platform));
+    _checkInstallationURL((Platform platform) => userMessages.androidMissingSdkInstructions(platform));
     _checkInstallationURL((Platform platform) => userMessages.androidSdkInstallHelp(platform));
     _checkInstallationURL((Platform platform) => userMessages.androidMissingSdkManager('/', platform));
     _checkInstallationURL((Platform platform) => userMessages.androidCannotRunSdkManager('/', '', platform));