flutter_lantern 0.0.1

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  • Changelog
  • Example
  • Installing
  • 77

Lantern #

pub package A Flutter plugin to access the device's lantern/torch on Android and iOS.

Usage #

To use this plugin, add lantern as a dependency in your pubspec.yaml file.

It works on Android Pie !!

For android, add the following to your manifest

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

and change the minSDK in the app build.graddle

minSdkVersion 21

Example #

// Import package
import 'package:flutter_lantern/flutter_lantern.dart';

// Turn the lamp on:

// Turn the lamp off:

// Turn the lamp with a specific intensity (only affects iOS as of now):
Lantern.turnOn(intensity: 0.4);

// Check if the device has a lamp:
bool hasLamp = await Lantern.hasLamp;

0.0.1 #

  • TODO: Describe initial release.


import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:flutter_lantern/flutter_lantern.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  _MyAppState createState() => _MyAppState();

class _MyAppState extends State<MyApp> {
  bool _hasFlash = false;
  bool _isOn = false;
  double _intensity = 1.0;
  String _platformVersion = 'Unknown';

  void initState() {

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    bool hasLamp = false;
    try {
      platformVersion = await Lantern.platformVersion;
      hasLamp = await Lantern.hasLamp;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
      _hasFlash = hasLamp;

  Widget build(BuildContext context) {
    return MaterialApp(
      theme: new ThemeData(primarySwatch: Colors.pink),
      home: new Scaffold(
        appBar: new AppBar(title: new Text('Lantern plugin example')),
        body: new Center(
          child: new Column(
            mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
            new Text('Device has flash: $_hasFlash\n Flash is on: $_isOn'),
            new Slider(value: _intensity, onChanged: _isOn ? _intensityChanged : null),
            new RaisedButton(onPressed: () async => await Lantern.flash(new Duration(seconds: 2)), child:  new Text("Flash for 2 seconds"))
        floatingActionButton: new FloatingActionButton(
          child: new Icon(_isOn ? Icons.flash_off : Icons.flash_on),
          onPressed: _turnFlash),

  Future _turnFlash() async {
    _isOn ? Lantern.turnOff() : Lantern.turnOn(intensity: _intensity);
    var f = await Lantern.hasLamp;
      _hasFlash = f;
      _isOn = !_isOn;

  _intensityChanged(double intensity) {
    Lantern.turnOn(intensity : intensity);
      _intensity = intensity;

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  flutter_lantern: ^0.0.1

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:flutter_lantern/flutter_lantern.dart';
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Learn more about scoring.

We analyzed this package on Apr 1, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.6
  • Flutter: 1.12.13+hotfix.8

Health issues and suggestions

Document public APIs. (-1 points)

8 out of 8 API elements have no dartdoc comment.Providing good documentation for libraries, classes, functions, and other API elements improves code readability and helps developers find and use your API.

Format lib/flutter_lantern.dart.

Run flutter format to format lib/flutter_lantern.dart.

Maintenance suggestions

The package description is too short. (-20 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.

Package is getting outdated. (-4.93 points)

The package was last published 54 weeks ago.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies