Android的重力感应（TYPE_GRAVITY）2.1 [英] Android gravity sensor (TYPE_GRAVITY) for 2.1

问题描述

我的软件专为2.3.3，我现在用的是重力感应器。

I have software designed for 2.3.3 where I am using the gravity sensor.

低于code -

Code below -

private SensorManager sman = (SensorManager) getContext().getSystemService(Context.SENSOR_SERVICE);
private Sensor magnetfield, gravity;
...
magnetfield = sman.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
gravity = sman.getDefaultSensor(Sensor.TYPE_GRAVITY);

我决定加入支持2.1版本。然而似乎TYPE_GRAVITY不支持2.1，我也得到一个错误， Sensor.TYPE_GRAVITY 不再被认可。

问题解答 - A）当我搜索的Andr​​oid重力感应器2.1谷歌的链接，视频，演示重力感应器在2.1的设备。这是否意味着有一种方法来访问它？ b）如果不是，那是什么可以用这个最低的版本？无法找到它的SDK。

Questions - A) When I search for "Android gravity sensor 2.1" googles links to videos that demo gravity sensor in 2.1 devices. Does that mean there is a way to get access to it? B) If not, what is the lowest version that can use this? Couldn't find it in the SDK.

感谢

推荐答案

通过查看源$ C ​​$ C，你可以看到，重力感应器是利用巴特沃斯滤波器实际计算。我也问DSP的一个问题（这里）。希望链接帮助，因为它让我明白了很多东西。

By looking at the source code you can see that the gravity sensor is actually computed using a Butterworth filter. I also asked a question on dsp (here). Hope the link helps because it helped me understand quite a lot of things.

有关问题的版本：其中重力感应器; 2.3你需要实现自己的过滤器，如果你想相同的结果。

For gravity sensor in versions < 2.3 you need to implement that filter yourself if you want the same results.

<一个href="http://gitorious.org/rowboat/frameworks-base/blobs/671a6ff4be11b3e2d8eb017e0c7a78e6133fb2b8/services/sensorservice/SecondOrderLowPassFilter.cpp">Here在2.3中使用的源$ C ​​$ C

Here is the source code used in 2.3

后来编辑：增加了一个有效的链接

Later edit: Added a valid link!

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