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Category: Android bluetooth auto connect programmatically

For some time now, it is common to see how Bluetooth technology is present in many of the gadgets we use daily.

With it, we can share files with our friends, integrate our phone into the audio system of our car or even connect gamepads to the video game console. There are less known uses for this technology, such as for example working as a trigger of certain events in an application.

One of the main problems with Bluetooth communications is that a continuous use of thm may lead to a complete drain of the battery in our device. For the last years, the invention of the Bluetooth Low Energy, BLEand its implementation in many of the latest devices launched in the market, have opened up more possibilities as it implies less power consumption than the classic Bluetooth.

In this entry, we will have a look into the discovery or nearby devices by using them. One is to use the application and the other one is for being able to discover the devices which are within reach. The call of the static method getDefaultAdapter on the class BluetoothAdapter retrieves an instance of it.

Once we know the device has Bluetooth capabilities, we must make sure the sensor is on. If it is off we have to ask the user to enable it. The following lines will launch a dialog requesting to turn on the Bluetooth only when it is off.

The scheme of working involves the use of a broadcast receiver which allows to declare the actions to take when some events happen in the system. The arguments we need will be two. The former is the broadcast receiver.

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The latter is the intent filter, which points out the events broadcast intents which will launch the actions of the receiver. We will create it with the option BluetoothDevice. In these lines of code mReceiver is the broadcast receiver.

The broadcast receiver is just an implementation of the abstract class BroadcastReceiver of Android. In its method onReceive we will be able to indicate the actions to take when the new device is discovered. In that function, we can have access to some information by reading the extras of the intent received.

Connect through Bluetooth on your Android device

For instance:. Finally, we just need to launch the scanning process for discovering Bluetooth devices. The adapter has a method for it called startDiscovery. It may happen that when we register our broadcast receiver and launch the startDiscovery the Bluetooth was already in discovery status.

To force to restart the process and get the whole list of devices we can cancel it with cancelDiscovey and restart it again.

It is possible that the BLE part of the application we are developing is not as important as to avoid installing it if it is not supported.

However the scheme for working is different. The stopLeScan method will finish the process of scanning. It is important to stop it and scan for small intervals just when needed, because a continuous scanning may lead to drain the battery.

It is important to know that when we are scanning for BLE devices we will only get BLE devices and not the ones which only support classic Bluetooth, so we may need to use the other API in case we needed the complete list. Also, we cannot search for both types of Bluetooth devices at the same time so we need use one after the other has finished.Google serves cookies to analyze traffic to this site.

Information about your use of our site is shared with Google for that purpose. See details. Connect your phone to your car display—your Android apps show up onscreen, just like that. Tap to get driving directions or talk to send a text. Even call your mom, hands-free. Android Auto is made to help you focus on the road. And have fun along the way. Just plug in and go. With Google Assistant on Android Auto, keep your eyes on the road and your hands on the wheel.

Use your voice to get help with your day. You can find routes, play your favorite songs and even check the weather. Just say "Hey Google" to get started. Get real-time alerts with Google Maps and Waze. Even ask Google Assistant to find gas along the way. Just say where to. And then go. Google Assistant can read your messages out loud.

android bluetooth auto connect programmatically

And you can write back by talking. From making calls to using chat apps with just your voice, Android Auto makes driving less distracting. Take your media on the road. And control it all with your voice.Probably, it is not necessary to explain what Bluetooth is and how to use it. We all use it in different purposes: Bluetooth headset, file transfer, Internet distribution, etc.

But many people are questioning whether it is possible to configure automatic Bluetooth connection on Android-devices. The answer is simple — you can do it. Wondering how? Read the article. Note that these functions are not initially provided.

Smartphones, tablets and laptops do not have built-in tools that allow you to automatically connect to Bluetooth. So you will have to search for the desired program, install it on the smartphone or tabletconfigure it, and only then the connection will happen automatically.

Programmatically Enable/Disable, Scan/Discovery and Pair Unpair Android Bluetooth

In addition, before the program can perform its direct functions, you will have to pair the device with the desired devices manually. Later in this article we will discuss how to pair the devices, which application to install, where to find it and how to configure it. You have to know a few rules and perform a clear sequence of actions.

To make pairing between devices, you must enable the Bluetooth on both devices and activate the detection function. Detection on the computer is activated as follows: in the notification area there is the Bluetooth icon.

Right-click it. In the menu, it is necessary to select "View Options". In the tab "Options" there is a line "Allow devices to find this computer". Put a tick here and save the settings.

android bluetooth auto connect programmatically

As a rule, the tick is removed automatically after minutes. To avoid this, you must press the "Menu" on the Samsung it is the touch button to the left of the mechanical "Home" key. Select the "Connection timeout" and choose the time after which the detection will be switched off. Now, when the detection is enabled, we can perform the pairing. If you want to connect your smartphone to your computer, then click the Bluetooth icon in the system tray again on your PC.

Select "Add a device". You will see a window, in which the system will display all Bluetooth devices available to connect.Through Android Bluetooth APIdevelopers can access most of bluetooth functionalities and let the applications wirelessly connect to bluetooth devices. Before connecting to a device, an application must discover or scan available bluetooth devices, request pairing and connect to the device.

Download the sample APK and source code from github. Passionate web and mobile application developer. How rotation of screen or other configuration change affect bluetooth discovery and scanning dialog?

Would you save already found devices nad list them again on activity recreation or just start discovery again with empty list which is not actually nice solution but more something like workaround.

Thank you…. I think it is good to save the already found devices. Then after the activity recreated again, save them from onSavedInstanceState on the list then start rescanning.

How to Programmatically Scan or Discover Android Bluetooth Devices

Also it is a good practice to allow user to cancel scanning using progress dialog with a cancel button. Thanks for answer. I did it already like that but I mess up something with fragment lifecycle and on discovery finished callback to dismiss dialog.

I think it is a good practice to check the progress dialog for its null value before dismissing it. Hi Thanx for your tutorial. Now i want to develop a Bluetooth chat type of app.

I successfully developed but in server side code i found one issue. Server want able to connect to my Client using serversocket. Do you have any idea to overcome this issue?

This is awesome. I been working on something like this for long time but was unable to make it work. This help me a lot. Thanks for sharing the code. Here are my observations : this sample app working properly for Android O. I am also looking into issue possibility can be we need to add some extra permission. Can you please update it if you get solution for Android M? I need your help to develop a one click app no interface that automatically executes as follows on tap on an android device: -scan all available bluetooth device -temporary store available bluetooth devices -auto initiates a connection on the available bluetooth devices one by one with a 10sec time out to move on to the next available device -if the other device accepts the connection, pair and save it among paired devices.

I tryed a lot of codes but this is the most complete and still not working for me. Could you help me? Your email address will not be published. Comments How rotation of screen or other configuration change affect bluetooth discovery and scanning dialog? Hi Ivan, I think it is good to save the already found devices.If you're using Android Auto for the first time, here are some steps to get started:.

Drive safely! Make sure to stay fully aware of the road and driving conditions, and always obey applicable laws. On your car display, select Android Auto. Follow the instructions to get started.

Wireless connection might take a few seconds to start.

android bluetooth auto connect programmatically

If you don't wish to use your phone with wireless projection, unpair the Bluetooth of your phone with your car display.

Google Help. Help Center Community Android Auto. Privacy Policy Terms of Service Submit feedback. Send feedback on Help Center Community. Android Auto. Set up your Android Auto app If you're using Android Auto for the first time, here are some steps to get started:. Prepare your phone Make sure your phone is running Android 5. For best performance, we recommend Android 6. If you are on Android 10, please follow the instructions here. Make sure your phone has a strong and fast network connection.

We recommend running Android Auto for the first time within Wi-Fi range for the fastest installation. Your phone might ask you to download or update certain apps, like Google Maps. Follow the steps on the screen to give Android Auto permission to access your phone's features and apps.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Android Enthusiasts Stack Exchange is a question and answer site for enthusiasts and power users of the Android operating system. It only takes a minute to sign up.

Whenever I enter my car, bluetooth is connected. What I would like is my speedcam alert application to be started once BT is connected and ideally terminate application when disconnected. I am using LG G6 with Nougat. But Automate is the easiest to use for your purpose. For LG phones specifically you can use Smart Settings to automatically open apps when a specific Bluetooth device is connected, among other things.

Among other things I use it to change the in-call volume whenever I connect my BT headset.

android bluetooth auto connect programmatically

With BT it detects the specific device paired, so it can do different things for e. BT headset or car. It comes as both free and paid app. The free versions has a limit to how many macros you can define I'm not sure about the exact limit, but it is quite lowbut is otherwise fully functional. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How to start application automatically when bluetooth device is connected?

Ask Question. Asked 2 years, 6 months ago. Active 2 years, 6 months ago. Viewed 28k times. Pablo Pablo 2 2 gold badges 2 2 silver badges 8 8 bronze badges.

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Active Oldest Votes. Deepak Gangwar Deepak Gangwar 3 3 silver badges 16 16 bronze badges. Are they going to run as background service, eating CPU time or the system will run automation app whenever certain event is fired? I have used automate which is not very resource hungry and I am not sure about working of it but I think it checks at regular intervals.

Turns out terminate part is impossible unless my phone is rooted, which is not possible at the moment Alex Knight Alex Knight 51 1 1 bronze badge.

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It does half of the job indeed, will try it. Sadly there is no option to kill the app. Maybe I use automation for killing it when BT disconnected I'm not in any way affiliated with ArloSoft.

Just a happy MacroDroid user. Thanks for your input. I will give it a try as well. Having more choice is always good. Sign up or log in Sign up using Google.This information will be visible to anyone who visits or subscribes to notifications for this post. Are you sure you want to continue? Go to the Legal Help page to request content changes for legal reasons.

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Google Help. Help Center Community Android Auto. Privacy Policy Terms of Service Submit feedback. Send feedback on Help Center Community. Android Auto. This content is likely not relevant anymore. Try searching or browse recent questions. Android Auto needs to work reliably in your vehicle so the standard is to connect over Bluetooth HFP for voice calls.

Community content may not be verified or up-to-date. Learn more. Recommended Answer Recommended Answers 0. All Replies Saumya Majumder. Recommended Answer.

Bluetooth overview

Let's say I gets into my car connects the cable to my phone and boom, automatically the Bluetooth of my phone turns on, it gets connected to my car, I can use Android Auto, all good stuffs. Now let's say during the ride you take a halt. You unplug the phone from your car. Android Auto gets disconnected. Now you taking a small tea break during the ride. Please note all these time the Bluetooth of your phone is still on as you didn't manually turned it off.

Now you come back to your car, connect your cable again and Android Auto starts functioning again. But the magical thing is now if you get a call on your phone it won't work over HFP.

You literally have to take your car to a side and take the call on your phone. The only way I found to resolve this issue is disconnect from Android Auto. Turn the Bluetooth off manually and then again when you connect on future Bluetooth will automatically turn on again and gets connected to your car.

Otherwise Android Auto might work much not the hands free calling. This is really annoying. Don't know why this happens. I don't even know if anyone else also face this issue.

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