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Google's IoT Developers Community Announcements

Android Things Developer Preview 7 is available today. New updates include camera improvements, new Bluetooth APIs, and many stability fixes.

Read the blog post here → goo.gl/o4sLWB

Android Things Developer Preview 7 addresses much of the top developer feedback we've received so far during preview. Download the preview today to try out the improved camera resolutions and Bluetooth pairing/connection APIs. Visit the developer console to learn about new features such as product sharing and device update channels.

#AndroidThings

Android Things Developer Preview 7

android-developers.googleblog.com

Bojan Komljenović: I did notice ScreenManager has no brightness mode and screenTimeOut methods? Timeout and automatic brightness mode are out of the picture?

Bojan Komljenović: Heads up to other developers, DP7 really has some breaking changes. I do like how managers are instanced now, but I just took an hour to refactor 10 user driver libraries. Changes are small and easy to imolement.

Dave Smith: +Bojan Komljenović Neither API currently functioned as expected, so they were removed until they could be added with consistent behavior.

PUNEET SHARMA

Google's IoT Developers Community Discussion

Is there GSM Dongle support in AndroidThings??? I am running it on raspberry pi 3 .

Mateusz Pachulski

Google's IoT Developers Community Discussion

21h

Hey guys,

I'm developing project in which I use Android Things. I got everything running but i want to minimaze lag on the screen and latency to improve user experience.
Currently I use waveshare LCD screen 7 inch it has an USB communication , the alternatieve is to use official raspberry PI screen which has DSI communication.

My question to you is , is there anyway to minimaze the lag on my current screen ? If not i raspberry PI screen an option do you think DSI communication will provide more smooth experience ?

I hope you can help me out how to solve this problem ! :)

Michael Richardson: You may be able to capture the USB interface (tcpdump can dump usb interfaces) to see how much traffic is going across it. I don't think you'll be able to decode it, but it should give you an idea if you are updating the entire screen each time, or just the changing parts. You'll have to delve into the SurfaceFlinger and/or kernel drivers to see if you can do better, but first, measure to see if there is anything to improve.

Bojan Komljenović: I can only comment that there is a noticable lag between switching Activity or loading data to a View even if you use RPi Official Touchscreen like I do. It's probably less laggy but still isn't snappy like a phone.

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David Lee

Google's IoT Developers Community Discussion

Question about Activity banner (header) when testing app.

Having a blast getting up an running with Android Things!

Is the banner at the top of the screen that shows the current activity always going to be there? Is it an artifact of the debug process using Android Studio? Can I hide it?

Cheers!

Dave Smith: It's called the ActionBar, and it's on by default because of the theme applied to the application or activity. The simplest way to remove it is to apply a theme with .NoActionBar in its name (e.g. Theme.Material.NoActionBar).

https://developer.android.com/reference/android/app/ActionBar.html
developer.android.com - ActionBar | Android Developers

David Lee: Thanks!
On a personal note, suppose we were discussing football rather than Android Things. I feel I'm posting questions like "what's a field goal?" And I'm getting friendly replies from Peyton Manning. Pretty cool.

Bojan Komljenović

Google's IoT Developers Community Discussion

I've just read that Android P will restrict and not publish sensor events via Sensor manager for apps which are idle. Does this affect in any way Android Things in future releases? How is this gonna work for a thermostat app which is mostly idle during runtime.

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James Puderer: I think the definition of 'idle' might be synonymous with 'background' in this context, so it probably wont be an issue unless you have your solution split between multiple applications.

Nick Felker: Yes, I believe that the restrictions only apply to background services. As an Android Things developer, your app is the key thing running and should not be affected by this change. If you want to use services that have access to sensor events, you can start them as foreground services without issue.

"Idle" refers to the state of an activity with respect to the activity stack, not with respect to user interactions.

Bojan Komljenović: Well, I got my answer. Thanks to all of you.

Zany K

Google's IoT Developers Community Discussion

Hi there. We are trying use NBIOT for our i.MX7D board and we came across a problem. Basically we need a script called chat which is normally located on /usr/sbin/chat on Linux (Android is Linux-based). However we can't find there or anywhere else. How can I solve this?

Walter Guerra

Google's IoT Developers Community Discussion

Hi,

I'm trying to use the new Bluetooth API from DP7, however, I'm having a problem pairing devices.

I'm using the guide published here ( https://developer.android.com/things/sdk/apis/bluetooth.html ).

The problem is that the method "onPairingInitiated" from the BluetoothPairingCallback object is never called. When I call "initiatePairing" on a device that does not require pin, it pairs successfully, calling the "onPaired" method. When the device requires a pin code, right after the "initiatePairing", the method "onPairingError" is called with error code 1 (UNBOND_REASON_AUTH_FAILED).

In both cases, the "onPairingInitiated" is not called (and it should be called on both).

Am I doing anything wrong? Is there any new tests you need to be able to help?

Thanks!
Walter Guerra

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Dave Smith: +Walter Guerra Please file an issue with any details about the remote device that you can provide so we can investigate: https://issuetracker.google.com/issues/new?component=192720&template=847005

Walter Guerra: I created an issue. Thanks.

Pulkit Bhuwalka: Hi Walter,

Thanks for the detailed post.

The onPairingInitiated method gets invoked whenever developers need to perform an additional step to complete the pairing process. This could be for cases where you may simply need to inform the user of a pin, or ask them to enter a pin etc.

The decision of what form of authentication needs to happen is negotiated by the Bluetooth systems on both the devices, and this depends on the IO Capabilities (Input Output Capabilities) for that device. For example, if both devices have screens and touch you can show a code on both devices, if one has a display and the other a keyboard you can display a code on one and enter the code on another.

At the current moment, the IO Capabilities for the Android Things boards are set to None. Due to this when you attempt to pair with it, it simply pairs unless a remote device decides that it won't allow pairing without a key. Typically devices decide on a security method based on the capabilities available on both the devices, but may reject it if it only allows secure pairing. (as is the case on your second device.)

In future releases, we will have another API which will allow developers to specify what the IO Capabilities of their device is. Once this is in place you'll be able to pair with devices with different authentication requirements and capabilities.

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Carl Whalley

Google's IoT Developers Community Discussion

I installed the Tensorflow image classifier sample with DP7 on an RP3 and the audio is really quiet. I Googled for how to increase the volume and it seemed this would work: https://stackoverflow.com/questions/27391326/how-to-change-the-volume-using-adb-shell-service-call-audio but the adb commands I issued just caused it to go totally silent with the only way back for me involving flashing the card again!

Whats the best way on this setup please?

How to change the volume using adb shell service call audio

stackoverflow.com

bala ji

Google's IoT Developers Community Discussion

hi all,
I am developing project motion sensing camera using android things and i have some problem to run please help me!!

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Dave McKelvie: that's telling you dataSnapshot.value is null, what could that mean?

github.com - android-things-motion-camera

Nick Felker: The problem is related to kotlin:

kotlin.TypeCastException: null cannot be cast to non-null type kotlin.Boolean

I think you need to look at where this is happening and why the value is null.

bala ji: please help..the code is here

private fun setupArmSystemToggle() {
armSystemToggleButton = findViewById(R.id.switch_arm_system)
armSystemImageView = findViewById(R.id.image_view_arm_system)
val armedValue = FirebaseDatabase.getInstance().getReference(SYSTEM_ARMED_STATUS_FIREBASE_REF)

armSystemToggleButton.setOnCheckedChangeListener { _, checkedValue ->
armedValue.setValue(checkedValue)
}

armedValue.addValueEventListener(object : ValueEventListener {
override fun onDataChange(dataSnapshot: DataSnapshot) {
Log.d(ACT_TAG, "onDataChange:" + dataSnapshot.toString())
val isArmed = dataSnapshot.value as Boolean
toggleUIState(isArmed)
}

override fun onCancelled(p0: DatabaseError?) {

}

})
}

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Dave Smith

Moderator

Google's IoT Developers Community Discussion

Breaking API Changes in Developer Preview 7

We made a lot of changes to the API in the latest preview release for consistency, readability, and testability. Anticipating that some of the changes might catch you off guard, we self-answered a few StackOverflow questions for common problems you might run into.

PeripheralManagerService throws NoClassDefFoundError

stackoverflow.com

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