# Android - Ruuvitag scanner, datalogger/sender

**URL:** https://f.ruuvi.com/t/android-ruuvitag-scanner-datalogger-sender/49
**Category:** 🇬🇧 Tell about your own use-case
**Created:** [11 January 2017 18:06 UTC](https://f.ruuvi.com/t/android-ruuvitag-scanner-datalogger-sender/49 "2017-01-11T18:06:11Z")
**Posts on this page:** 2
**Page:** 4

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### Author: ![anon24749318](https://f.ruuvi.com/letter_avatar_proxy/v4/letter/a/779978/32.png) [@anon24749318](https://f.ruuvi.com/u/anon24749318)
#### Post date: [27 September 2017 19:30 UTC](https://f.ruuvi.com/t/android-ruuvitag-scanner-datalogger-sender/49/63 "2017-09-27T19:30:22Z")

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> [@otso](#):
>
> Android app

It is the java script from Android app, and my change in java too.  
I made a little change in java to get the - sign, so the 2 lines works on my Android.

> [@](#):
>
> ```
> double uTemp = (rawData[4] & 0x7F) + (rawData[5] / 100.0);
> temperature = (rawData[4] & 0x80) == 0x80 ? (-1.0 * uTemp) : uTemp;
> 
> ```

The old lines in java.  
Ruuvi/Android\_RuuvitagScanner/app/src/main/java/com/ruuvi/tag/model/RuuviTag.java

> [@](#):
>
> /\*  
> double uTemp = (((rawData[4] & 127) \<\< 8) | rawData[5]);  
> double tempSign = (rawData[4] \>\> 7) & 1;  
> temperature = tempSign == 0.00 ? uTemp / 256.0 : -1.00 \* uTemp / 256.0;  
> \*/

---

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### Author: ![Fugit185](https://f.ruuvi.com/letter_avatar_proxy/v4/letter/f/a87d85/32.png) [@Fugit185](https://f.ruuvi.com/u/Fugit185)
#### Post date: [30 October 2017 17:25 UTC](https://f.ruuvi.com/t/android-ruuvitag-scanner-datalogger-sender/49/64 "2017-10-30T17:25:32Z")

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I downloaded this app to Oneplus 5 and it worked nicely, no crashing so far.  
Few questions.  
Does the alarms work?  
I can’t get “View graph” working, there is no data.

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