App hangs when waking up from suspend mode on Android

Development Platform & Builds Mobile
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1

Hello,

I have this problem, after I launched app on Android device, I pressed power button to enter suspend mode, and after 5 to 10 seconds pressed power button again, then I will see a totally black screen, and the buttons on the navigation bar are not responding, in this case I will need to force reboot my device.

Any ideas?

2

Hi ZenTechEntertaiment,

On what device are you testing, and what is its OS? Are you able to get logcat from the time of the hang?

3

Thank you wittlief,

So far I’ve tested (5.1.1), Sony Z3(5.0.2), Samsung Note 4(5.0.1), and all of them will hang.
Here’s the logcat log from and Note 4.[link text][1]

[link text][2]

48438-log.txt (59 KB)
[2]: 48439-log+note4.txt (373 KB)

4

Hi ZenTechEntertaiment,

On conferring with the Android dev, here is what he’s seeing in your :

There’s an APP_CMD_DESTROY so it actually killed the game. Normally if you just turned off the screen you’d see APP_CMD_SAVE_STATE / APP_CMD_PAUSE / APP_CMD_LOST_FOCUS. On waking up, you’d see APP_CMD_RESUME / APP_CMD_TERM_WINDOW / APP_CMD_INIT_WINDOW / APP_CMD_GAINED_FOCUS.

Hope that helps!

5

OK, I think I figured it out.

Thanks for wittlief’s answer pointed out the problem was onDestroy being called, I then did some research on it:

I realized I have to add

android:configChanges="orientation|keyboardHidden|screenSize"

in AndroidManifest.xml if Android API Level is greater than 13, but you can’t just modify the xml directly, you have to modify UEDeployAndroid.cs, and it already had set orientation|keyboardHidden, I added screenSize right after it.

Now my app no longer reveiced onDestroy when turning off the screen, it looks like the issue has been resolved.

6

I can confirm this, had the same issue. Still using 4.7, but are there any changes in place/mind to make this more available to fix? I do not think I am able to modify UEDeployAndroid.cs without the source code, and this issue is definitely happening on multiple devices on multiple versions if the android api level is 13 or greater. I do not think that even in 4.8 we can append to the configChanges without tampering with the source code. I haven’t been following the changes and updates to the engine as much as I should but this should get fixed if it hasn’t been already.

7

Hey,

I wanted to let you know that screenSize was added to android:configChanges in AndroidManifest.xml to prevent onDestroy issues on suspend. This should be implemented in 4.9, after speaking with our Android Developer. I made sure to request that this was placed in the release notes as well.

Thanks!