不可能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.
一些测试后，我发现我的Nexus S的加速度计的速度总是每秒50值当手机处于活动状态，以及每秒6值，当它处于休眠状态（以 PARTIAL_WAKE_LOCK ），要什么就给什么（正常， UI 的速度， 游戏或最快）。
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，我决定安装在互联网上发现了一个应用程序，它测试加速度计的速度： http://samoht.fr/tuto/accelerometers-frequency-on-android-with-$c$c
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
不过，我得到了同样的错误：无论我要求的速度，它始终是每秒50值的时候，手机被激活。
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的行为这种方式。这是个问题：
I don't understand why my phone behaves this way. Is it a problem :
- 有关的Nexus S？
- 具体到我的电话？
- 与安卓4.0？
修改：我已经测试了另一种的Nexus S（安卓4.0）的程序，和我有同样的问题。 如此看来，以消除上面列出的可能性之一：它不仅关系到我的电话
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
我已经进行了一些测试不同的智能手机。下面是结果：
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
的请注意，这些测试都使用部分唤醒锁被执行。没有它，Nexus S的不提供数据都当它是睡着了。的
Note that the tests have been performed using a partial wake lock. Without it, the Nexus S provides no data at all when it is asleep.
也有智能手机的一个有用的列表，其中加速度计发（或没有）兼容的数据睡着的时候：的 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
这篇关于不可能改变加速度计的速率的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
