Android Build - Works in preview - grey screen on device

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mikailain

- Grimmy
- - Joined 20 Nov, 2012
  - 182 topics • 489 posts
- 1
- 28 Feb, 2020
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Hi, nothing more to say really, the title says it all, I don't have any mimyfying or anything. I'm trying to run a debug .apk

Is there some way to debug? Seems odd it works fine in preview and not on device.

Any guidance much appreciated.

Thanks
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- Ashley Construct Team Founder
- Moderator
- - Joined 21 May, 2007
  - 669 topics • 30,357 posts
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- 28 Feb, 2020
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See Checking for errors in browsers, which covers mobile.
- Grimmy
- - Joined 20 Nov, 2012
  - 182 topics • 489 posts
- 1
- 28 Feb, 2020
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Wow, I never knew we could do this! AMazing!

However I have no idea what this error means:

Uncaught (in promise) TypeError: Cannot read property '0' of undefined

at C3.Runtime._LoadDataJson (c3runtime.js:454)

at C3.Runtime.Init (c3runtime.js:454)

at async f._InitDOM (main.js:5)

at async f._Init (main.js:5)
- Grimmy
- - Joined 20 Nov, 2012
  - 182 topics • 489 posts
- 1
- 28 Feb, 2020
- Quote
I also see this error:

Not allowed to load local resource: file:///android_asset/www/icons/icon-256.png

..but I havent changed the icons at all. They are the default ones that come with a C3 new project .

?
- Grimmy
- - Joined 20 Nov, 2012
  - 182 topics • 489 posts
- 1
- 1 Mar, 2020
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In the end it was because I had a file named data.json which seemed to be causing the failure to run on device.

Once i removed that..everything was fine.

Naming clash?
- cybertron7
- - Joined 30 Nov, 2014
  - 49 topics • 233 posts
- 1
- 2 Mar, 2020
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construct.net/en/make-games/manuals/construct-3/tips-and-guides/performance-tips
Read this. I just went through days of hell. Read this SUPER carefully 5 times.
- Ashley Construct Team Founder
- Moderator
- - Joined 21 May, 2007
  - 669 topics • 30,357 posts
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- 2 Mar, 2020
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data.json is required for the app to start. It's literally your game data. If you remove it, the app will no longer work.
- Grimmy
- - Joined 20 Nov, 2012
  - 182 topics • 489 posts
- 1
- 2 Mar, 2020
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In my case data.json was a file that I had created manually and put in my files directory. Maybe you speak of another data.json file that lives somewhere else?