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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.
View the full blog at its source
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By Samsung Newsroom
Smartwatches have become a part of our daily lives, combining functionality and style in one compact device. With Samsung's Watch Face Studio (WFS), designers can create unique watch faces that are customized to their requirements. Dynamic weather features, which display real-time updates and forecasts on the watch face, are particularly appealing.
This article covers WFS’s weather features, their uses, and how to create useful weather-themed watch faces. You can create a watch face using weather data as art.
This article introduces the following weather features which enhance watch face design:
Weather forecast The last time the weather was updated in ICU format Weather tags You can follow the examples in this article by downloading the sample project from here.
Forecast for the next few hours and days
Weather information becomes more valuable when presented in a way that is easy to read at a glance. Using weather tags, WFS enables you to easily incorporate forecasts for the coming hours and days.
Hourly forecast
The forecastHours(index, text) tag can be used to show hourly weather updates. One of the two pieces of information that the forecastHours tag collects is an index that takes a number starting at 1 for the following hour. Thus, by setting the index, you can set the data for the next few hours.
The text part uses five distinct weather tags:
• Temperature
• Time of day
• Weather condition
• Weather condition name
• Weather data available
Use the forecastHours tag with the weather condition, time, and temperature to offer users a short-term forecast of what to expect throughout the day. Tiny weather icons (like Sunny: ☀️, Rainy: 🌧️, and Snow: ❄️) can be used as bitmaps portraying the current weather conditions and the corresponding temperatures.
Forecast hours for icon
You can set the weather icon for the upcoming hour by following these steps:
Create a text component. Use this forecast tag on the text: forecastHours (1, "COND") Choose the Bitmap Font to use icons for the forecastHours (). Select images for the appropriate weather conditions. NoteYou need to create the icons, using any design tool, for your project.
5. Set the font size to 40. Figure 1: Setting the font size
NoteOnly a few icons are used in this article for certain conditions; the clear condition icon is used for all other conditions.
Include 10-15 on the CUSTOM tab since weather condition has values up to 15. Figure 2: Bitmap font setting
Forecast hours for temperature
You can now adjust the temperature by using the forecastHours() tag. You may display the temperature (positive or negative) for the upcoming hour and the temperature unit in degrees by following these steps:
Consider a text element. To display the temperature in degrees, use forecastHours(1,"TEM")° Choose the temperature unit (([WTHR_TEM_UNIT] == 1)? "C": "F")
The full tag expression looks like this:
(forecastHours(1, "TEM"))°(([WTHR_TEM_UNIT] == 1)? "C": "F"))
To display the weather forecast for the next hour, just change the index value to 2. Availability of weather data
For every forecast tag, you need to check if the data is available with this tag: (forecastHours(X, "IS_AVAIL")).
In the sample project, for every forecast group, the corresponding weather tag is used for checking its availability. The following tag expression is used for the next hour’s forecast:
((forecastHours(1, "IS_AVAIL")) - 1) * 100
Figure 3: Tag expression for checking availability of weather data
Daily forecast
You can incorporate daily weather forecasts into watch face designs using the forecastDays() tag. Customized indices (for example, 1 for tomorrow) make it simple to portray multi-day weather trends. WFS lets you show the weather conditions for a certain day, including high and low temperatures using forecastDays(index, "TEM_HIGH") for highest temperature and forecastDays(index, "TEM_LOW") for lowest temperature.
The later parts of the sample project show the weather predictions for tomorrow.
WFS uses the forecastDays(1,"TEM_HIGH") tag to show the temperature for the following day’s high and forecastDays(1,"TEM_LOW") tag for the next day’s low.
For the high and low temperatures tomorrow, use the following tag expression:
(forecastDays(1,"TEM_HIGH"))° ~ (forecastDays(1,"TEM_LOW"))°(([WTHR_TEM_UNIT] == 1)? "C": "F")
You can apply a similar tag expression for the forecast for the days after tomorrow by changing the index value.
Last weather update (ICU format)
This watch face example incorporates the most current update time to reassure customers that the weather information is recent. Weather data should be updated often to remain accurate.
WFS offers the most recent weather update in the ICU format. To add the most recent weather update time in ICU format, follow these steps:
From the component list, get the ICU date and time. Figure 4: ICU date and time
To customize the ICU date and time, select the PROPERTIES tab. Choose the ICU Format as HH: MM from the DATE AND TIME section. Set the Local Calendar to Gregorian and the Time Zone to Sync with Device. Select Last Updated Time (Weather) as the Time Source. Figure 5: Date and Time
Other weather tags
Current weather condition for icon
You can use the bitmap font for the current weather condition since it is already prepared for forecastHours(). Use the [WTHR_COND] tag, which provides the current weather, and choose bitmap as the font setting.
Current temperature
Use the [WTHR_TEM] tag to show the current temperature. The current temperature is obtained with the following tag expression, which also sets the temperature unit:
[WTHR_TEM]°(([WTHR_TEM_UNIT] == 1)? "C": "F")
Today’s highest and lowest temperatures
You can display the highest and lowest temperatures of the day by using the tags [WTHR_DAY_TEM_HIGH]) for the highest temperature and [WTHR_DAY_TEM_LOW] for the lowest temperature. The highest and lowest temperatures for today are listed below, based on the forecastDays() tag expression for the highest and lowest temperatures for the following day:
([WTHR_DAY_TEM_HIGH])° ~ ([WTHR_DAY_TEM_LOW])°(([WTHR_TEM_UNIT] == 1)? "C": "F")
Summary
Smartwatches offering weather forecasts are useful and engaging. With WFS, designers can use advanced tags like forecastDays(), forecastHours(), and last update time to deliver real-time weather updates, daily forecasts, and information such as high and low temperatures. Because they provide information at a glance, smartwatch faces are practical and attractive.
If you have questions or need help with the information presented in this article, you can share your queries on the Samsung Developers Forum. You can also contact us directly for more specialized support through the Samsung Developer Support Portal.
View the full blog at its source
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By adem377
Hello everyone, I hope you're doing well. I have Tizen TV 4 and 6 devices, and I would like to know how I can capture a screenshot within the Tizen system on these devices.
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By Sau
Hello,
I have Samsung TV (qe55q80datxxh) with Tizen OS and unfortunately it doesn’t find necessary apps on its store. I.e. App called “TV Zone” (https://tvzone.app) - it supports Tizen OS, but on Samsung store it is not visible. Is there any way to install this app in Samsung via store or like a third party app using usb stick (is it even possible?)?
Txanx!
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By Alex
Three weeks ago, the company released in India the Samsung Z1, its first smartphone powered by Tizen, a homegrown alternative to Google Inc.’s Android operating system.
This week, Samsung is pushing the Samsung Z1 into Bangladesh, a neighbor of India with more than 150 million people and a similarly low rate of smartphone penetration.
After several missteps and rethinks, Samsung’s strategy for its Tizen smartphones is taking a clear shape: the company is aiming the fledgling platform squarely at first-time smartphone users, many of whom may not even have a bank account. The Samsung Z1 is selling in India for about $90.
To that end, Samsung has been touting the “lightweight” nature of the Tizen operating system, meaning that it requires relatively little computing power and can handle most tasks without requiring pricey high-end specifications.
That same lightweight approach has also allowed Samsung to use Tizen as the platform for many of the devices it is hoping will populate its “connected home,” from televisions to smart watches and home appliances.
Despite concerns that Samsung’s new smartphone would face stiff competition in India, where several local handset makers are touting low-end smartphones — some of them in partnership with Google — Samsung says that its Tizen smartphones have received “positive responses” there.
Positive enough, it seems, to at least push Tizen into a second country.
Source: http://blogs.wsj.com/digits/2015/02/06/samsung-extends-tizen-smartphone-to-bangladesh/
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