android_midi 0.20.0

A Flutter plugin for advanced MIDI device control and messaging on Android, with native performance.

0.20.0 Channel Management & Performance Optimization

This update introduces a major refactoring of the MIDI communication layer to improve code quality, enhance channel management flexibility, and optimize performance for low-latency applications.

New Features

• Dynamic Channel Control: The MIDI API now supports sending messages to single, multiple, or all 16 MIDI channels dynamically using a new channels parameter.
• Performance Optimization (Batching): All MIDI messages are now batched and sent in a single sendRawData platform call. This significantly reduces the overhead of crossing the Dart-to-native bridge, minimizing latency and jitter.
• Improved Code Structure: The refactoring separates the data preparation logic from the data transmission logic.
  • MidiChannel is a new class responsible for preparing raw MIDI byte data for individual channels.
    • AndroidMidi handles the orchestration, collecting data from multiple MidiChannel objects and sending it in a single, batched operation.
• Major API refactor: all MIDI methods now use named parameters for clarity and future-proofing.
• UI integration for custom MIDI message sending.
• Improved error handling and comments throughout the codebase.
• Updated widget tests to match new UI and API signatures.

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Breaking Changes

• The send... methods (e.g., sendNoteOn, sendControlChange) no longer take a channel parameter. This has been replaced by the new optional channels parameter, which accepts a List<int>.

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How to Use

• Single Channel: To send a message to channel 5, use sendNoteOn(..., channels: [5]).
• Multiple Channels: To send a message to channels 0 and 1, use sendNoteOn(..., channels: [0, 1]).
• All Channels: To broadcast a message to all channels, simply omit the channels parameter: sendNoteOn(...).

0.1.0

• Initial public release.
• Core MIDI device and event models (note on/off, control change, program change, pitch bend, aftertouch, SysEx).
• High-level APIs for playing notes, chords, arpeggios, sequences, and phrases with tempo control.
• Real-time MIDI input/output streams.
• Platform interface and method channel for Android MIDI.
• Native JNI integration for low-latency MIDI messaging.
• Example app and test coverage for all main features.