| page.title=Sensors |
| pdk.version=1.0 |
| doc.type=porting |
| @jd:body |
| |
| <div id="qv-wrapper"> |
| <div id="qv"> |
| <h2>In this document</h2> |
| <a name="toc"/> |
| <ul> |
| <li><a href="#androidSensorsInterface">Interface</a></li> |
| </ul> |
| </div> |
| </div> |
| |
| <p>Android defines a user space C abstraction interface for sensor hardware. The interface header is defined in |
| <code>hardware/libhardware/include/hardware/sensors.h</code>. |
| 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: |
| <ul> |
| <li>Accelerometer</li> |
| <li>Magnetic Field</li> |
| <li>Orientation</li> |
| <li>Gyroscope</li> |
| <li>Light</li> |
| <li>Pressure</li> |
| <li>Temperature</li> |
| <li>Proximity</li> |
| </ul> |
| </p> |
| |
| <a name="androidSensorBuildingDriver"></a><h3>Building a Sensor Library</h3> |
| <p> To implement a Sensors driver, create a shared library that implements the interface defined in <code>sensors.h</code>. You must name your shared library |
| <code>libsensors.so</code> so that it will get loaded from <code>/system/lib</code> at runtime. |
| </p> |
| |
| <p> The following stub file, <code>Android.mk</code>, ensures that <code>libsensors</code> compiles and links to the appropriate libraries:</p> |
| |
| <pre> |
| 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) |
| </pre> |
| |
| <a name="androidSensorsInterface"></a><h3>Interface</h3> |
| |
| |
| <p><span class="lh3"><a name="androidDoxygenNote"></a></span> |
| |
| <p class="note"><strong>Note</strong>: This document relies on some Doxygen-generated content that appears in an iFrame below. To return to the Doxygen default content for this page, <a href="sensors.html">click here</a>.</p> |
| |
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