torch_control

A Flutter plugin for torch/flashlight/lamp control. Offers API for:

• checking if torch is available
• turning the torch on and off
• toggling the torch
• flashing the torch for a given duration

Platforms supported by the plugin:

• Android old API levels 16 to 19 (4.1 to 4.4) via android.hardware.Camera
• Android API levels 21 to 31 (5.+) via android.hardware.camera2
• iOS (currently untested)

Install

Add torch_control: 0.2.0 to your pubspec.yaml file

Set permissions for Android

<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.FLASHLIGHT"/>

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />

Usage

To check if a torch is available and ready to use:

await TorchControl.ready();

To turn on and off the torch:

TorchControl.turnOn();
TorchControl.turnOff();
TorchControl.turn(true);
TorchControl.turn(false);

To toggle the torch:

TorchControl.toggle();        // if is on it is turned off an vice versa

To check the torch state:

TorchControl.isOn();
TorchControl.isOff();

• In the beginning the torch state is initialized to off. To ensure correctness of the on/off status you should call TorchControl.turnOff() (or TorchControl.turnOn()) somewhere at the beginning.

To flash the torch for a given duration:

TorchControl.flash(const Duration(seconds: 1));

Examples

See the companion example for demonstration on how to use the plugin.

There are two of my apps in PlayStore that use this plugin:

• Flashlight Torcher - Yet another torch/flashlight/lamp app with source code available.
• Count On Me - A tally counter app with many options, advanced features, statistics, and various methods of counting.

Trivia

Why yet another torch plugin? I needed a simple plugin for controlling the torch with the support for null safety, Dart 2, and a bit more flexible interface which was not readily available at the time. Moreover, I've never written a Flutter plugin as well as any Kotlin code before.