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2. When it comes to using Bluetooth along with flutter, there is close
to no documentation available. Whatever few articles are available,
they are either too technical to bog you down, or are not clearly
explained and become overwhelming. We will help you by
demonstrating some basic concepts to implement Bluetooth
functionality to your app.
We will be using the “flutter Bluetooth serial” plugin in the app
to add Bluetooth. This plugin is implemented from another parent
plugin called “flutter blue”. Although it is a new plugin and is not
entirely bug-free minds you it will definitely do your job.
Note: Before moving forward it would be important for you to
know that this plugin will work only for android devices.
3. Implementations:
Firstly, add this dependency in your “pubspec.yaml” file:
The code of the app in the “main.dart” file will look like this:
4.
5. Now we will create a StatefulWidget called the “BluetoothApp”.
Then we will define some variables and a key in the
_BluetoothAppStore. Along with this, we will also get an instance
of FlutterBluetoothSerial in this class.
6. This class will enable to control and
retrieve Bluetooth information:
7. Now we will be implementing the critical portion of the app. We
have to get the list of paired Bluetooth devices and check
whether Bluetooth is connected. This will be done
asynchronously. Then we will also have to create a list of
Bluetooth devices to be shown in the UI later.
These operations must be done in a “future” method, which will
be called in initState().
Now it is time to move on to the UI, which is the most pretty
part of flutter. The code will be pretty long but it would mostly be
easy to read if you are somewhat familiar to the Flutter widget.
Post completing the UI, you will have to implement some
methods.
8. Now it is time to implement some methods.
First, we will start with thget DeviceItems()
method:
9. Now that we have dealt with the UI, it’s time to use 4 methods.
We will be using the connect and disconnect methods for this
example. Then we will be implementing a method to display a
snack bar to the user when no Bluetooth devices are connected
when the user tries to connect.
Now we are mostly finished. We are left with two methods, one
for sending a message when to turn on the Bluetooth and the
other foe switching it off.
10.
11. After falling all these steps, Dart work required to
make this work is now complete. But still now,
when we run the app, it will crash:
12. To fix this, we are required to add the SDK into
the AndroidManifest. Follow these steps after
navigating to your project folder: android -> app
-> src -> main -> AndroidManifest.xml
13. Add these 2 lines of code in your
AndroidManifest.xml file:
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