CODEWITHSUNDEEP
androidcordovasleep
dogatonic
dogatonic

Reputation: 2788

Phonegap Android: Prevent Sleep by Programatic User Activity

I have a Phonegap Android app that scans RFID chips. Apparently scanning RFID does not count as a user action, because the device will go to sleep after the interval set in Android Settings (which is a maximum of 10 minutes).

So despite constant scanning, my device will go to sleep. So I need a way to tell the OS that I'm active, programtically after each RFID scan.

Currently, I am doing something that I don't want, which is using 

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

to prevent sleep while the app is running, but I'd like to still be able to use the sleep interval if the device is actually inactive.

I had high hopes for using powerManager.userActivity(l, false) but apparently this is only available for System apps, so I cannot set permission for it.

Any ideas how to keep the device active while not doing any touch screen interaction?

Upvotes: 1

Views: 5976

Answers (3)

dogatonic
dogatonic

Reputation: 2788

A WakeLock is the answer, but the key is to use ON_AFTER_RELEASE. With this flag, the user activity timer will be reset when the WakeLock is released.

So for the NFC plugin, under the onPause method I added:

MyMainActivity ma = (MyMainActivity) cordova.getActivity();
wl = ((PowerManager) ma.getSystemService(Context.POWER_SERVICE))
    .newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE, "wakeywakey");
wl.acquire();

And under the onResume method I added:

wl.release();

With this arrangement, when an RFID chip is scanned, the NFC plugin will create the WakeLock and then release it, which will reset the activity timer. Also, I used SCREEN_BRIGHT_WAKE_LOCK even though it is deprecated, as this will brighten the screen if it has gone dim.

Upvotes: 0

Dipesh KC
Dipesh KC

Reputation: 3297

You can use this cordova plugin

https://github.com/EddyVerbruggen/Insomnia-PhoneGap-Plugin

To prevent sleeping you call:

window.plugins.insomnia.keepAwake();

and to allow sleeping again:

window.plugins.insomnia.allowSleepAgain();

Upvotes: 3

Gajotres
Gajotres

Reputation: 57309

You will need to play with JAVA a bit.

Add this code to your activity class:

 PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
 PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
 wl.acquire();

Here you will find more info.

Also dont forget to relese WakeLock at the end:

 wl.release();

You also need to be sure you have the WAKE_LOCK permission set in your Manifest.

Upvotes: 0

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