fix false “no email Managers available” on Android 11+ (SENDTO without attachments)

[taljacobson]

Android: fix false “no email Managers available” on Android 11+ (SENDTO without attachments)

Summary

• Fixes a false PlatformException when sending email without attachments on Android 11+.

Reproduction

• Fresh install on a recent Android device (e.g., Pixel 8 Pro, Android 16).
• Call send() with subject/body and no attachments.
• Actual: “no email Managers available.” With an attachment it works.

Root cause

• The plugin pre-queried PackageManager for ACTION_SENDTO (mailto:). On Android 11+, package visibility restrictions often make this query return empty unless the host app declares <queries>.

Changes

• Remove PackageManager pre-query/resolve for ACTION_SENDTO.
• Start the implicit intent directly via startActivityForResult and only report an error if ActivityNotFoundException is thrown.
• Respect appSchema via intent.setPackage(...) when provided.
• Preserve attachment flow with FLAG_GRANT_READ_URI_PERMISSION.

Behavior

• Chooser is shown when available; if no handler exists, a real error is returned.

Compatibility

• No Dart API changes.
• No <queries> required for this flow (optional for isAppInstalled).

Testing

• Verified on Pixel 8 Pro (Android 16): no-attachment send shows chooser; attachments work unchanged.
• Example app builds and runs after Gradle migration.

Example project updates

• Migrate to Flutter’s declarative Gradle plugins (dev.flutter.flutter-plugin-loader / dev.flutter.flutter-gradle-plugin).
• Bump compileSdk to 36.
• Migrate to embedding v2.

Related issues

• Fixes Android 11 Unhandled Exception: PlatformException(not_available, no email Managers available, null, null) #38: Android 11 Unhandled Exception: PlatformException(not_available, no email Managers available, null, null)

Changelog

• Bump version to 3.0.2 with the Android fix and example build migration.

[Copilot]

Pull Request Overview

This PR fixes a false "no email Managers available" error on Android 11+ when sending emails without attachments. The issue was caused by package visibility restrictions that made PackageManager queries return empty results unless specific queries were declared in the manifest.

• Removes PackageManager pre-query for ACTION_SENDTO intent and launches intent directly
• Migrates example Android build to Flutter's declarative Gradle plugins
• Updates Android compileSdk to 36 and migrates to embedding v2

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pubspec.yaml	Bumps version to 3.0.2 for the Android fix
example/android/settings.gradle	Migrates to declarative Gradle plugin management
example/android/build.gradle	Removes buildscript block in favor of declarative plugins
example/android/app/src/main/java/com/dataxad/flutter_mailer_example/EmbeddingV1Activity.java	Updates import to use embedding v2 FlutterActivity
example/android/app/build.gradle	Migrates to declarative plugins and updates compileSdk to 36
android/src/main/java/com/dataxad/flutter_mailer/MethodCallHandlerImpl.java	Fixes Android 11+ email sending by removing PackageManager pre-query
CHANGELOG.md	Documents the Android fix and example migration changes

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[Copilot]

[nitpick] The variable mResult is being set to null in the catch block, but it's also set to null in the existing catch block for FlutterMailerException below. Consider extracting this cleanup into a helper method to avoid duplication.