Category: Android sensor example github

Android sensor example github

Skip to content. Instantly share code, notes, and snippets. Code Revisions 1 Stars 1 Forks 1. Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. Android Accelerometer.

Motion sensors

SturzSensor ; import android. Activity ; import android. Color ; import android.

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Sensor ; import android. SensorEvent ; import android. SensorEventListener ; import android. SensorManager ; import android. Bundle ; import android. Log ; import android. View ; import android. Window ; import android.

WindowManager ; import android. LinearLayout ; import android. Toast ; import com. GraphView ; import com. GraphViewSeries ; import com. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. You signed in with another tab or window.

Reload to refresh your session. You signed out in another tab or window. SturzSensor. Activity. Color. Sensor .GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again.

You will need a Windows or a Mac system with Android Studio to run the examples in this book.

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All the examples are developed using Android Studio, but you can still execute them on Eclipse with ADT by exporting them to an Eclipse project structure. You are encouraged to run all the examples in the book on a real Android device as there is no official support for sensors in the Android emulator.

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An open source sensor simulator is available, and it will simulate some of the sensors on the Android emulator in real time. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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android sensor example github

Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit ea1b Jul 2, You can also refer to the following books: Android Programming for Beginners Android 3. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.

android sensor example github

May 12, Smartphones and tablets include many different types of sensorsfor example accelerometers, gyroscopes, magnetometers, and thermometers. These sensors allow us to obtain information about the movement, environment, and position of the device.

While the Processing language does not have specialized functions to read data from these sensors, you can import the packages in the Android SDK that receive sensor measurements into your sketch.

In the first example, we will create a sketch that responds to changes in acceleration, so we will be using the data from the accelerometer. The first step to use the sensor API is to obtain the context of the activity that contains the sketch, and get a sensor manager from this context.

Then, we can initialize the sensor we need in our sketch, in this case an accelerometer. We do all of this in the setup function:. Now we need to add a "listener" class that will notify the sketch that new data is available from the sensor. Once we have a listener instance in the sketch, we can register the listener with the manager:.

You probaby noticed the SensorManager. This argument sets the rate at which the sensor is updated with new data. Faster rates mean more responsiveness, but also more battery consumption. The event listener has two methods, onSensorChanged and onAccuracyChanged.

We only need to use onSensorChanged to get the data from the sensor. In the case of the accelerometer, the data consists of three float numbers, representing the acceleration along the X, Y, and Z axis of the device, defined as follows:.

android sensor example github

As a first test, we can simply print these values to the screen, and verify that if we place the phone flat on the table with the screen facing up, then we see a Z acceleration of 9. As a best practice for using sensors, it is recommended to unregister the listener when the sketch's activity is paused to reduce battery usage, and then registering it again when the activity resumes. We can achieve this adding the following code to our sketch:.

We need to check for a null manager instance because onPause or onResume could be called before the setup function in our sketch.

One possible use of the sensor data is to control the movement of graphical elements in our sketch. The values from the accelerometer directy represent the force the device is subject to, so if we use those to control the behaviour of, say, a rigid body system, then we could pair behaviours in the code with movements in real space. In order to achieve this goal, we will make use of the Box2D for Processing library by Daniel Shiffman. Although this library was not created for Android, it can still be used from sketches in the Android mode since it is written in Java!

We will combine the basic code from the previous example to read accelerometer data with a simple Box2D simulation where the borders of the screen define the boundaries of the simulation, and a number of boxes bounce around under the acceleration measured by the device. The full code of the example is available here.

Without the accelerometer data, we can write the Box2D code as follows the implementation of the Box and Wall classes is not included, check the full example code on GitHub :. In this code we used the constant acceleration along Y of 0,but now we can link the gravitational force in Box2D to the acceleration values from the sensor by doing:.

Google's developer documentation provides detailed information on how to get data from other motion sensors. Alternatively, you could also use the Ketai library from Daniel Sauter and Jesus Duran, which wraps all of the handling code and makes it very simple to obtain values from different sensors.

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Ketai can be installed through the Contribution manager. Note the use of the displayDensity factor used to scale the font size, which the mode obtains from DisplayMetrics. This factor is 1 in a dpi screen for example a x, 1.The sensors plugin has reached a stable API, we guarantee that version 1. To use this plugin, add sensors as a dependency in your pubspec. Each of these is exposed through a BroadcastStream : accelerometerEventsuserAccelerometerEventsand gyroscopeEventsrespectively.

Also see the example subdirectory for an example application that uses the sensor data. Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more. We analyzed this package on Apr 13,and provided a score, details, and suggestions below.

Analysis was completed with status completed using:. Readme Changelog Example Installing Versions Usage To use this plugin, add sensors as a dependency in your pubspec. This will expose three classes of sensor events, through three different streams.

AccelerometerEvent s describe the velocity of the device, including the effects of gravity. Put simply, you can use accelerometer readings to tell if the device is moving in a particular direction. UserAccelerometerEvent s also describe the velocity of the device, but don't include gravity.

They can also be thought of as just the user's affect on the device. GyroscopeEvent s describe the rotation of the device. Require Flutter SDK 1. Update to AndroidX. Migrate to using the new e2e test binding. Add a e2e test. Define clang module for iOS. This shouldn't result in any functional changes, but it requires any Android apps using this plugin to also migrate if they're using the original support library.

Set SDK constraints to match the Flutter beta release. Updated package description. Upgraded to Gradle 4. Older Flutter projects need to upgrade their Gradle setup as well in order to use this version of the plugin. Instructions can be found here. All rights reserved. Depend on it Add this to your package's pubspec. Health: Code health derived from static analysis. Maintenance: Reflects how tidy and up-to-date the package is.

Overall: Weighted score of the above. Learn more about scoring.Android Sensors supports several sensors via the SensorManagerfor example the accelerometer. Unfortunately, you cannot test the accelerometer on the Android emulator.

The Sensor class defines several constants for accessing the different sensors. You can access the sensor via the sensorManager. Once you acquired a sensor, you can register a SensorEventListener object on it.

This listener will get informed, if the sensor data changes. To avoid the unnecessary usage of battery power, you can register your listener in the onResume method and de-register it in the onPause method. We will build an application which will change its background color if it is shuffled. Create a new Android project called de. Android and Networking. Free use of the software examples is granted under the terms of the Eclipse Public License 2.

Android Sensor. This tutorial describes how to use the Android Sensor manager. The tutorial is based on Eclipse 3. Android Sensors 1. SensorManager Android Sensors supports several sensors via the SensorManagerfor example the accelerometer. Sensor listener Once you acquired a sensor, you can register a SensorEventListener object on it. Tutorial: Accelerometer We will build an application which will change its background color if it is shuffled.

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Activity ; import android. Color ; import android.

Environment sensors

Sensor ; import android. SensorEvent ; import android. SensorEventListener ; import android. SensorManager ; import android. Bundle ; import android.Android sensors give applications access to a mobile device's underlying physical sensors. They are data-providing virtual devices defined by sensors. Android sensors are virtual devices that provide data coming from a set of physical sensors: accelerometers, gyroscopes, magnetometers, barometer, humidity, pressure, light, proximity and heart rate sensors.

Not included in the list of physical devices providing data are camera, fingerprint sensor, microphone, and touch screen. These devices have their own reporting mechanism; the separation is arbitrary, but in general, Android sensors provide lower bandwidth data. Android does not define how the different physical sensors are connected to the system on chip SoC.

The interpretation of the reported data depends on the sensor type.

android sensor example github

See the sensor type definitions for details on what data is reported for each sensor type. Content and code samples on this page are subject to the licenses described in the Content License. Overview Input. Neural Networks. Audio Accessories.

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Custom Accessories. Sensors HAL. What are Android sensors? Often, sensor chips are connected to the SoC through a sensor huballowing some low-power monitoring and processing of the data. To reduce power consumption, some architectures are hierarchical, with some minimal processing being done in the application-specific integrated circuit ASIC - like motion detection on the accelerometer chipand more is done in a microcontroller like step detection in a sensor hub.

It is up to the device manufacturer to choose an architecture based on accuracy, power, price and package-size characteristics. See Sensor stack for more information. Batching capabilities are an important consideration for power optimization. See Batching for more information. The official Android Sensor types are defined in sensors.

Those types are documented in the Android SDK. If a manufacturer integrates a new kind of sensor on an Android device, the manufacturer can define its own temporary type to refer to it. They are not tested by CTS. Once Android defines an official sensor type for this kind of sensor, manufacturers must stop using their own temporary type and use the official type instead.

This way, the sensor will be used by more application developers. The list of all sensors present on the device is reported by the HAL implementation. There can be several sensors of the same type. For example, two proximity sensors or two accelerometers. The vast majority of applications request only a single sensor of a given type. For example, an application requesting the default accelerometer will get the first accelerometer in the list.

Sensors are often defined by wake-up and non-wake-up pairs, both sensors sharing the same type, but differing by their wake-up characteristic. Android sensors provide data as a series of sensor events.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I am developing a Pedometer Android application to count number of steps taken and using the steps calculate the distance covered and calories burned.

It detects number of steps when the sensor detects motion. I have searched but cannot find an appropriate solution or tutorial for it. Any help or suggestions. The problem here is that your implementation is not sophisticated enough: it only checks if there is a spike in the accelerometer data and assumes that the spike is coming from a step. It has no idea where the spike in acceleration is really coming from: it might as well come from you jumping or shaking the device in your hand.

How to make it more accurate then? Well, that is a really difficult question which has been topic for scientific papers for a really long time. Even the most sophisticated fitness trackers which use machine learning, signal processing and other statistical methods have difficulties to determine when the step is real and when it is just noice or user playing with the device. Luckily Android does have it's own builtin step counter and step detectorwhich are more sophisticated than the class in yor example.

So unless you really want to learn signal processing and AI which I highly recommended, although I don't know much about the data science of step detectionI would suggest to use builtin detector and counter. By implementing SensorEventListener listener within a class and overriding the two methods onSensorChanged and onAccuracyChanged you can start tracking steps.

That's a very naive method to achieve step count. You should use Android's built-in step counter because it also uses other sensors if available such as gyroscope which can improve the step detection. You should especially use this built-in version if you are going to built things on top it.

You need a reliable underlying layer. You can also try using linear acceleration sensor which is calculated by removing gravity component from the accelerometer. The gravity makes accelerometer very sensitive, that's why you see step counter increasing when you are just standing. You can also try Google scholar for the latest papers on step counting algorithms.

Especially try to read the latest survey on the topic. Learn more. Pedometer Step Counter Ask Question. Asked 2 years, 5 months ago. Active 2 months ago. Viewed 20k times. But there are some problems with it: When I stand at the same place with my device in my hand and just move my hand or give a jerk to device, it detects the change and adds to step count.

If I move very slowly with device in my hand it does not detect the change. If i jump, then it adds several steps in the counter.

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I have checked some other applications from Play Store they do not do this kind of stuff.


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