Sensors

In this document

Android defines a user space C abstraction interface for sensor hardware. The interface header is defined in hardware/libhardware/include/hardware/sensors.h. In order to integrate sensors with Android you need to build a shared library that implements this interface. The types of sensors currently supported by Android include:

  • Accelerometer
  • Magnetic Field
  • Orientation
  • Gyroscope
  • Light
  • Pressure
  • Temperature
  • Proximity

Building a Sensor Library

To implement a Sensors driver, create a shared library that implements the interface defined in sensors.h. You must name your shared library libsensors.so so that it will get loaded from /system/lib at runtime.

The following stub file, Android.mk, ensures that libsensors compiles and links to the appropriate libraries:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE := sensors

LOCAL_PRELINK_MODULE := false

LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw

LOCAL_SHARED_LIBRARIES := liblog
# include any shared library dependencies

LOCAL_SRC_FILES := sensors.c

include $(BUILD_SHARED_LIBRARY)

Interface

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