Samsung Galaxy S24: What we know so far, including release and price
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By Samsung Newsroom
The Galaxy Watch has a built-in accelerometer sensor that measures movement or acceleration forces in three dimensions (X,Y, and Z axes). This data is commonly used for tracking movement, detecting gestures, and enabling fitness-related features like sleep tracking, fall detection, step counting, running, and workout tracking.
The accelerometer measures acceleration along three axes:
X-axis: Side-to-side movement.
Y-axis: Forward-and-backward movement.
Z-axis: Up-and-down movement.
Figure 1: Axis directions for the accelerometer sensor
Acceleration is typically measured in meters per second squared (m/s²) or gravity units (g), where 1g = 9.81 m/s².
This article describes how to read accelerometer sensor data from a Galaxy Watch running Wear OS powered by Samsung and also shows the conversion procedure for the raw data.
Environment Setup
Android Studio IDE is used for developing Wear OS applications. The examples in this article use Java, but Kotlin can also be used. Going forward, this article assumes you have already installed the latest Android Studio version on your PC.
Read Accelerometer Data from Galaxy Watch
To get accelerometer data, we need to use Android Sensor APIs from the SensorManager library.
To retrieve accelerometer data from your Galaxy Watch:
Create a new Wear OS project in Android Studio by selecting File > New Project > Wear OS > Empty Activity > Finish. Set the minimum SDK version to API 30 or higher.
Add permission to access the sensor into the manifest file (AndroidManifest.xml):
<uses-feature android:name="android.hardware.sensor.accelerometer" /> You do not need to manually set the runtime permission to access the accelerometer. This permission is granted by default.
Design your preferred layout (.xml file) to show accelerometer data on the Galaxy Watch screen. This example uses three TextViews in a Constraint Layout to show the output of the three axes of the sensor. You can also check the result in the Logcat window in Android Studio. <TextView android:id="@+id/textViewX" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="8dp" android:text="X" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.207" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/textView2" /> For more detailed code, check the sample application.
Use the SensorManager library and SensorEventListener to read accelerometer data. To implement them: Initialize the SensorManager library globally: private SensorManager sensorManager; To retrieve android.hardware.SensorManager for accessing sensors, you have to use getSystemService(). sensorManager = SensorManager.getSystemService(Context.SENSOR_SERVICE); As our target is the accelerometer sensor specifically, it is set as the default sensor here. It is recommended to always check the sensor availability before using it in the code. The procedure to do so is explained in this guide.
To make the accelerometer the default sensor:
Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); To get continuous data from your Galaxy Watch, you need to register a listener to notify you if there is new data. This is done using a SensorEeventListener in Android’s Sensor API. sensorManager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_NORMAL); The listener method onSensorChanged() is called whenever new data is available. The new data is processed in the listener. private SensorEventListener listener = new SensorEventListener() { @Override public void onSensorChanged(SensorEvent sensorEvent) { // for absolute values X = Math.abs(sensorEvent.values[0]); //0 -> X Axis 1-> Y Axis 2 -> Z Axis Y = Math.abs(sensorEvent.values[1]); Z = Math.abs(sensorEvent.values[2]); Log.e("--MainActivityTag--", "X: " + X + "\n" + "Y: " + Y + "\n" + "Z: " + Z); // do whatever you want to do with the data } @Override public void onAccuracyChanged(Sensor sensor, int i) { } }; Here, onAccuracyChanged(Sensor sensor, int i) is a part of the SensorEventListener interface. It is triggered when the accuracy of a sensor changes. However, for the accelerometer, it is called rarely, as the accelerometer data accuracy usually remains constant.
Unregister the listener when the data collection is over. Otherwise, it can cause unusual battery consumption. Test the Code Sample
You can check out the sample app (download it using the link below) and try it out on your Galaxy Watch 4 and later.
AccelerometerDataExample.zip (332.2 KB)
Run the sample project on your Galaxy Watch. You will see the following screen.
Figure 2: Output of the sample project (accelerometer data on Galaxy Watch)
Accelerometer Data Units and Conversion for Galaxy Watch
In the application end, raw accelerometer data from Galaxy Watch is converted into meters per second squared (m/s²).
Equation
raw data * 9.80665 (gravity force) / 4096 (8g rescale)
Example
Assume,
raw_x = raw data received from the sensor
acc_x = accelerometer data in application end
if raw_x = 100
acc_x = 100 * 9.80665 / 4096
After this, acc_x is received by the application, containing the Acceleration value in m/s².
Convert the Data into G-Force Units
The conversion from m/s² to g is: 1 / 9.80665
So 1 m/s² =0.10197g
Information about the Accelerometer Sensor
The accelerometer provides the 3 axis values separately. The sampling rate of the accelerometer is usually a multiple of 50 Hz, but 100 Hz is also supported. The range of the accelerometer is +- 8G. Sampling rate:
#Maximum Delay: https://developer.android.com/reference/android/hardware/Sensor#getMaxDelay() // 160 msec
#Minimum Delay: https://developer.android.com/reference/android/hardware/Sensor#getMinDelay() // 10 msec It is always recommended to read calibrated data to avoid unnecessary noise. To get the result in g-force units, you need to divide the accelerometer values by 4096 (along every axis). It is recommended to use a filter while reading any sensor data. Make sure to always unregister the listener and stop all the services after using. Failure to do so can cause excessive battery drain. There are some restrictions of using background services for Galaxy Watch. Conclusion
For a Galaxy Watch running Wear OS powered by Samsung, accelerometer data is widely used in fitness tracking, fall detection, gesture recognition and motion analysis. Moreover, data conversion enables precise tracking for applications.
In this article, we’ve seen one of the ways of reading accelerometer sensor data on a Galaxy Watch running Wear OS powered by Samsung. You can also read sensor data using the Samsung Health Sensor SDK. For more details on Samsung Health, check here.
If you have any questions about or need help with the information in this article, you can reach out to us on the Samsung Developers Forum or contact us through Developer Support.
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By Samsung Newsroom
March 2025 New Revenue Share Model for Galaxy Store
From May 15, 2025, Galaxy Store will introduce a new, developer-friendly revenue share model. Developers and publishers of paid games, applications, themes, and in-app items (both consumable and non-consumable) will earn 80% of the sales proceeds generated through the Galaxy Store, with Samsung retaining 20%. For subscriptions, the revenue share will be 85% for developers and 15% for Samsung. Get ready to boost your revenue potential with Galaxy Store!
Visit the Samsung Developer Portal for more details on these exciting changes. Samsung Health Data SDK 1.0.0.b2 Has Been Released!
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*Data types supported: Body composition, blood glucose, blood pressure, heart rate, nutrition, water intake
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Discover more about the AI-driven mobile innovations and connected experiences unveiled at MWC 2025 at the Samsung Electronics Newsroom.
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By Samsung Newsroom
Today, Samsung is announcing a new revenue share model for Galaxy Store, increasing the current revenue share of 70/30 to 80/20 for developers and publishers.
Starting May 15, 2025 (GMT+0), developers and publishers of paid games, apps, and consumable and non-consumable in-app items using Samsung Checkout will start receiving 80% of the net sales proceeds* generated and received through Galaxy Store, while Samsung will retain 20%. For subscription services, the revenue share model will be 85% / 15%.
For all developers and publishers who are currently publishing an app on Galaxy Store and obtained certification via the Galaxy Store Seller Portal, no action is required to start benefiting from this higher revenue share. Unless you have a custom agreement, Samsung will automatically apply the new revenue share terms on May 15, 2025 (GMT+0). If you have a custom agreement with Samsung, you will not be impacted by this change and the terms of the custom agreement will continue to apply.
FAQ
Q: When will I start receiving the new increased revenue?
A: The new revenue share model will start on May 15, 2025 (GMT+0).
Q: Will purchases made today in Galaxy Store be affected?
A: Purchases made in Galaxy Store before May 15, 2025 (GMT+0), will continue at the current 70/30 revenue share model.
Q: Will there be any other changes in the calculation of the revenue share?
A: No. Before distributing your revenue share, Samsung will deduct the same customary fees from the total revenue such as sales tax, bank fees and other cost as provided in the Galaxy Store Seller Portal Terms and Conditions.
Q: I have a custom agreement with Samsung. Will this change affect the agreement?
A: No, if you have a custom agreement you will not be impacted. If you are interested in moving to the new revenue share model, please contact your Samsung account manager.
Q: What apps will benefit from the new revenue share model?
A: All paid apps, including games and themes, as well as consumable and non-consumable in-app items will benefit from the new 80/20 revenue share model.
Developers of subscription services (where recurring payment is made by users) will receive a higher revenue share based on an 85/15 revenue share model.
Q: What do I need to do to receive my increased revenue share?
A: If you have accepted Samsung Galaxy Store Seller Portal Terms and Conditions, then no action is necessary. Samsung will automatically update your revenue share to the new terms on May 15, 2025 (GMT+0). If you have a custom agreement, you will not be impacted by this change. If you are interested in moving to the new revenue share model, please contact your Samsung account manager.
For further inquiries, please reach out to [email protected].
*Subject to the deduction of customary sales tax and other fees.
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By Samsung Newsroom
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Want to learn more? Fill out this form, and we’ll share more details on certifying your Matter products with SmartThings. Samsung Mobile Advance Applications Are Now Open!
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Dev Insight Jan 2025: Unveiling Invites to "Galaxy Unpacked 2025" Ushering in a New Era of Mobile AIBy Samsung Newsroom
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