Courtesy: GitHub

Android BluetoothLeGatt Sample

This sample demonstrates how to use the Bluetooth LE Generic Attribute Profile (GATT) to transmit arbitrary data between devices.

Introduction

This sample shows a list of available Bluetooth LE devices and provides an interface to connect, display data and display GATT services and characteristics supported by the devices.

It creates a Service for managing connection and data communication with a GATT server hosted on a given Bluetooth LE device.

The Activities communicate with the Service, which in turn interacts with the Bluetooth LE API.

Pre-requisites

  • Android SDK 26
  • Android Build Tools v26.0.1
  • Android Support Repository

Screenshots

Screenshot Screenshot

Getting Started

This sample uses the Gradle build system. To build this project, use the "gradlew build" command or use "Import Project" in Android Studio.

Support

If you've found an error in this sample, please file an issue: https://github.com/googlesamples/android-BluetoothLeGatt

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.

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.

compile "com.android.support:support-v4:26.1.0"

compile "com.android.support:support-v13:26.1.0"

compile "com.android.support:cardview-v7:26.1.0"

compile "com.android.support:appcompat-v7:26.1.0"

compileSdkVersion 26

minSdkVersion 18

targetSdkVersion 26

package com.example.android.bluetoothlegatt

versionCode 1

versionName 1.0

uses-permission

  • android.permission.BLUETOOTH
  • android.permission.BLUETOOTH_ADMIN

DeviceScanActivity

Activity for scanning and displaying available Bluetooth LE devices.

DeviceControlActivity

For a given BLE device, this Activity provides the user interface to connect, display data, and display GATT services and characteristics supported by the device. The Activity communicates with {@code BluetoothLeService}, which in turn interacts with the Bluetooth LE API.

BluetoothLeService

Service for managing connection and data communication with a GATT server hosted on a given Bluetooth LE device.

Initializes a reference to the local Bluetooth adapter. * @return Return true if the initialization is successful.

Connects to the GATT server hosted on the Bluetooth LE device. @param address The device address of the destination device. @return Return true if the connection is initiated successfully. The connection result is reported asynchronously through the {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)} callback.

Disconnects an existing connection or cancel a pending connection. The disconnection result is reported asynchronously through the {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)} callback.

After using a given BLE device, the app must call this method to ensure resources are released properly.

Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)} callback. * @param characteristic The characteristic to read from.

Enables or disables notification on a give characteristic. * @param characteristic Characteristic to act on. @param enabled If true, enable notification. False otherwise.

Retrieves a list of supported GATT services on the connected device. This should be invoked only after {@code BluetoothGatt#discoverServices()} completes successfully. * @return A {@code List} of supported services.