Bluetooth Audio

This sample demonstrates the use of Android Bluetooth APIs for audio from an Android Things app.

Note: The Android Things Console will be turned down for non-commercial use on January 5, 2022. For more details, see the FAQ page.

Introduction

This sample demonstrates how to enable an A2DP sink on your Android Things device and control lifecycle events, such as pairing, connection and playback so that other devices, like a phone, can connect and play audio in your Android Things device.

Screenshots

(Watch the demo on YouTube)

Pre-requisites

• Android Things compatible board
• Android Studio 2.2+
• (optional) a speaker or headsets, so that you can listen to the audio and notifications.
• (optional) Two buttons connected to the GPIO pins, so that you can control the sample at runtime. Without the buttons, you can use a keyboard or adb. For more on this, look at the main activity, where the supported commands are described.

Build and install

On Android Studio, click on the "Run" button.

If you prefer to run on the command line, type

./gradlew installDebug
adb shell am start com.example.androidthings.bluetooth.audio/.A2dpSinkActivity

Note: If you connect an audio source to an Android Things audio sink (eg this sample) but you can't hear your media playing through the audio jack, check if you have an HDMI display connected. If so, the audio will be routed to the HDMI output.

Enable auto-launch behavior

This sample app is currently configured to launch only when deployed from your development machine. To enable the main activity to launch automatically on boot, add the following intent-filter to the app's manifest file:

<activity ...>

    <intent-filter>
        <action android:name="android.intent.action.MAIN"/>
        <category android:name="android.intent.category.HOME"/>
        <category android:name="android.intent.category.DEFAULT"/>
    </intent-filter>

</activity>

License

Copyright 2017 The Android Open Source Project, Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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.