The blueflow from thanosfisherman

blueflow's Introduction

BlueFlow

Android Bluetooth classic API wrapped in Coroutines / Flow inspired by RxBluetooth and AndroidBluetoothLibrary.

Dependency

Add the following to your app module build.gradle file. Note that the respective Coroutine dependencies should also be included in the project.

dependencies {
   implementation "io.github.thanosfisherman.blueflow:blueflow:<latest-version-number-here>"
}

Permissions

The following permissions must be granted for this lib to be able to work correctly.

    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<!-- Dangerous Permissions below. Make sure you explicitly ask for location Permissions in your app on Android 6.0+ -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

Usage

Under Construction! For now check the sample project which demonstrates the bluetooth device discovery.

Creating an instance

Create a Singleton instance of BlueFlow like so

val blueFlow: BlueFlow = BlueFlow.getInstance(applicationContext)

Checking for Bluetooth availability

You can check whether bluetooth is available on a specific device and/or if it's enabled or not.

      if (blueFlow.isBluetoothAvailable()) { //Checks if bluetooth is supported on this device
          if (blueFlow.isBluetoothEnabled()) { //Checks if bluetooth is actually turned ON for this device
              Toast.makeText(applicationContext, "BLUETOOTH IS ON", Toast.LENGTH_LONG).show()
          } else {
              Toast.makeText(applicationContext, "PLEASE ENABLE BLUETOOTH", Toast.LENGTH_LONG).show()
          }
      } else { //Bluetooth is NOT Supported on the device
              Toast.makeText(applicationContext, "BLUETOOTH NOT AVAILABLE ON THIS DEVICE", Toast.LENGTH_LONG).show()
      }

License

Copyright 2020 Thanos Psaridis

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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blueflow's Issues

Read Flow consumed without a consumer

Hello dev, this is not really an issue and maybe I didn’t understand correctly the nature of the channelFlow used in the readByteArrayStream function. In few words I created a Service to share the socket between activities but switching from an activity to another I loose some message. I tried to write on stackoverflow but it seems that no one knows your lib. Take a look here to check the code I wrote: https://stackoverflow.com/questions/66965201/i-loose-data-from-bluetooth-moving-between-activities-and-using-services?r=SearchResults

Anyway a read example would be appreciated.
Thank you

bt socket closed, read return: -1, but then emission attempt has been detected

If I turn off the connected device I receive this error and I don't receive the "Disconnected" message.

Complete error from your sample:

E/AndroidRuntime: FATAL EXCEPTION: main
Process: io.github.thanosfisherman.blueflow.sample, PID: 12390
java.lang.IllegalStateException: Flow exception transparency is violated:
Previous 'emit' call has thrown exception java.io.IOException: bt socket closed, read return: -1, but then emission attempt of value 'io.github.thanosfisherman.blueflow.sample.BtConnection$BtErrorConnectingState@cb152e5' has been detected.
Emissions from 'catch' blocks are prohibited in order to avoid unspecified behaviour, 'Flow.catch' operator can be used instead.
For a more detailed explanation, please refer to Flow documentation.
at kotlinx.coroutines.flow.internal.SafeCollector.exceptionTransparencyViolated(SafeCollector.kt:114)
at kotlinx.coroutines.flow.internal.SafeCollector.checkContext(SafeCollector.kt:82)
at kotlinx.coroutines.flow.internal.SafeCollector.emit(SafeCollector.kt:70)
at kotlinx.coroutines.flow.internal.SafeCollector.emit(SafeCollector.kt:55)
at io.github.thanosfisherman.blueflow.sample.usecase.BtConnectUseCase$connect$1.invokeSuspend(BtConnectUseCase.kt:19)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7399)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:502)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)

It would be nice if you can also provide a sample to receive/send data using the mvvm architecture.

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