无法改变加速度计的速率 [英] Impossibility to change the rate of the accelerometer

问题描述

我必须从我的 Android 手机收集加速度计数据，所以我做了一个小程序来做到这一点.

I have to collect accelerometer data from my Android phone, so I have made a little program to do that.

经过一些测试，我发现我的 Nexus S 加速度计的速率在手机处于活动状态时总是每秒 50 个值，在手机处于睡眠状态时每秒 6 个值(带有 <代码>PARTIAL_WAKE_LOCK)，无论我要求什么速率(NORMAL、UI、GAME 或 FASTEST).

After some tests, I have found that my Nexus S accelerometer's rate is always 50 values per second when the phone is active, and 6 values per second when it is asleep (with a PARTIAL_WAKE_LOCK), whatever the rate I ask for (NORMAL, UI, GAME or FASTEST).

所以我决定安装一个在互联网上找到的测试加速度计速率的应用程序:http://samoht.fr/tuto/accelerometers-frequency-on-android-with-code

So I decided to install an application found on the Internet which tests the rate of the accelerometer : http://samoht.fr/tuto/accelerometers-frequency-on-android-with-code

但我遇到了同样的错误":无论我要求什么速率，当手机处于活动状态时，它总是每秒 50 个值.

But I got the same "error" : whatever the rate I ask for, it is always 50 values per second when the phone is active.

我不明白为什么我的手机会这样.是不是有问题:

I don't understand why my phone behaves this way. Is it a problem :

• 与 Nexus S 相关?
• 特定于我的手机?
• 与 Android 4 相关?

编辑:我已经在另一个 Nexus S(Android 4)上测试了该程序，但我遇到了同样的问题.所以它似乎消除了上面列出的一种可能性:它不仅与我的手机有关.

EDIT : I have tested the program on another Nexus S (Android 4), and I have the same problem. So it seems to eliminate one of the possibilities listed above: it is not related only to my phone.

推荐答案

我在不同的智能手机上进行了一些测试.结果如下:

I have performed some tests on different smartphones. Here are the results:

Samsung Galaxy Teos
-------------------
* When awake
    Normal: 4.17 Hz
    UI: 8.43 hz
    Game: 16.93 Hz
    Fastest: 109.42 Hz

* When asleep
    The phone sends null values (0), whatever the mode I chose


Samsung Nexus S
---------------
* When awake
    Normal: 49.51 Hz
    UI: 49.51 hz
    Game: 49.51 Hz
    Fastest: 49.51 Hz

* When asleep
    6.06 Hz, whatever the mode I chose

LG Nexus 5
----------
* When awake
    Normal: 15.39 Hz
    UI: 15.4 Hz
    Game: 50.05 Hz
    Fastest: 196.74 Hz

* When asleep
    Normal: 4.96 Hz
    UI: 15.41 Hz
    Game: 50.12 Hz
    Fastest: 198.53 Hz

LG Nexus 4
----------
* When awake
    Normal: 15.75 Hz
    UI: 15.74 Hz
    Game: 48.86 Hz
    Fastest: 195.85 Hz

* When asleep
    Normal: 5.5 Hz
    UI: 15.74 Hz
    Game: 49.16 Hz
    Fastest: 196.75 Hz


Samsung Galaxy Nexus
--------------------
* When awake
    Fastest: 125 Hz

* When asleep
    It sends data


Samsung Galaxy Note 2
---------------------
* When awake
    Fastest: 100 Hz

* When asleep
    The phone does not send anything


Samsung Galaxy S3 and S3 Mini
-----------------------------
* When awake
    Fastest: 100 Hz

* When asleep
    Fastest: 100 Hz


HTC Wildfire
------------
* When awake
    Normal: 4 Hz
    UI: 12 hz
    Game: 22.2 Hz
    Fastest: 38.40 Hz

* When asleep
    The phone does not send anything, whatever the mode I chose


HTC Desire
----------
* When awake
    Normal: 4.36 Hz
    UI: 11.9 hz
    Game: 23.3 Hz
    Fastest: 47.27 Hz

* When asleep
    The phone does not send anything, whatever the mode I chose

请注意，测试是使用部分唤醒锁执行的.没有它，Nexus S 在睡眠时根本不提供数据.

还有一个有用的智能手机列表，加速度计在睡眠时发送(或不发送)兼容数据:http://www.saltwebsites.com/2012/android-accelerometers-screen-off

There is also a useful list of smartphones which accelerometers send (or not) compatible data when asleep: http://www.saltwebsites.com/2012/android-accelerometers-screen-off

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