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In android, we have Sensor.TYPE_GRAVITY, Sensor.TYPE_ACCELEROMETER, Sensor.TYPE_LINEAR_ACCELERATION.

And it is known from android developer forum that, "The output of the accelerometer, gravity and linear-acceleration sensors must obey the following relation: acceleration = gravity + linear-acceleration"

Do Sensor.TYPE_GRAVITY and Sensor.TYPE_LINEAR_ACCELERATION make use of the same sensor as Sensor.TYPE_ACCELEROMETER - i.e., the accelerometer? What is purpose of having 3 different constants if the value of one can be deduced using the other using low pass and high pass filters?

P.T.
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user682765
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2 Answers2

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It's because TYPE_LINEAR_ACCELERATION and TYPE_GRAVITY are available since API Level 9 (Android 2.3). If you want to build an application in a lower API version, you will only have access to TYPE_ACCELEROMETER (since API Level 3). TYPE_LINEAR_ACCELERATION and TYPE_GRAVITY are really helpful and makes unnecessary to split TYPE_ACCELEROMETER. I deploy for Android 2.2 (API Level 8) and still don't know how to do it!

More info: http://developer.android.com/reference/android/hardware/Sensor.html

gian1200
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If you want more detailed information about those new "fused" sensors, have a look at the answers to this question. There you will find the explanation of the different types of sensors, directly from one of the Google developers working on these topics.

Community
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jap1968
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