noise_meter

Install

Add noise_meter as a dependency in pubspec.yaml For help on adding as a dependency, view the documentation.

Post Installation

On Android you need to add a permission to AndroidManifest.xml:

<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Usage

Initalization

int frequency = 500; 
Noise noise = new Noise(frequency);
StreamSubscription<NoiseEvent> _noiseSubscription;

Where frequency is the update rate in milliseconds of type int, this means the lower the update rate, the more frequently events will come in.

Start listening

_noiseSubscription = noise.noiseStream.listen(onData);

Where onData() handles the events from StreamSubscription. An example could be:

void onData(NoiseEvent event) {
  _noiseValues.add(event.decibel);
}

Each NoiseEvent coming in has an integer field called decibel, containing the noise level of the reading.

Stop listening

_noiseSubscription.cancel();

Libraries

noise_meter

Dart

dart:ui
Built-in types and core primitives for a Flutter application. [...]

Core

dart:async
Support for asynchronous programming, with classes such as Future and Stream. [...]
dart:collection
Classes and utilities that supplement the collection support in dart:core. [...]
dart:convert
Encoders and decoders for converting between different data representations, including JSON and UTF-8. [...]
dart:core
Built-in types, collections, and other core functionality for every Dart program. [...]
dart:developer
Interact with developer tools such as the debugger and inspector. [...]
dart:math
Mathematical constants and functions, plus a random number generator. [...]
dart:typed_data
Lists that efficiently handle fixed sized data (for example, unsigned 8 byte integers) and SIMD numeric types. [...]

VM

dart:io
File, socket, HTTP, and other I/O support for non-web applications. [...]
dart:isolate
Concurrent programming using isolates: independent workers that are similar to threads but don't share memory, communicating only via messages. [...]