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I am developing a application in android along with the Android wear support. While seeing the documentation from https://developer.android.com/training/building-wearables.html, The following API's are available.
I couldn't fine a reference for sensor API. How can i detect the sensors from the Smartwatch, either Accelerometer or Gyro?
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Yes they both can be used to together describe the motion of a device, but they can also be used to correct each other. For example, I read and experimented that the drift in the gyroscope can be corrected by using the accelerometer even though they don't essentially measure the same thing.
Hold your device in your hand, wave it in the air in the pattern of a figure-eight a few times and then set the device back down on a flat surface. Accelerometer Sensor automatically re-adjusts the range of your accelerometer and can effectively calibrate your G-Sensor.
The main difference between the two devices is simple: one can sense rotation, whereas the other cannot. In a way, the accelerometer can gauge the orientation of a stationary item with relation to Earth's surface.
Most Android-powered devices have an accelerometer, and many now include a gyroscope. The availability of the software-based sensors is more variable because they often rely on one or more hardware sensors to derive their data.
You can use all standard Android APIs inside your wearable app: https://developer.android.com/training/wearables/apps/index.html
Wearable app is just like any other Android .apk file, but installed on your watch.
Messaging API, Data Layer API etc are for syncing data between your phone and your wearable device.
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