Fragment destruction about android-material-stepper HOT 15 CLOSED

Hi, the fragment being recreated is something the ViewPager does so that it doesn't keep too many fragments in memory at once. Please note that going back from the third stp to the first one is not the only scenario in which the first fragment will get recreated. This could also happen if e.g. you rotate the device or your app gets killed by the system and you go back to it.
The recommended approach here would be to save the data in a saved instance state. You could check out the sample app for an example: https://github.com/stepstone-tech/android-material-stepper/blob/master/sample/src/main/java/com/stepstone/stepper/sample/step/StepFragmentSample.java

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Ok, but the problem that I'm facing isn't only the lose of values. The main problem is that in the first fragment, I use a library to pick an image and then put it in an ImageView, but when I return back from the third to the first fragment, and I try to pick the image, the app crashes because giving me error in onActivityResult: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} to activity. The library that I use in the first fragment is the following: https://github.com/jdamcd/android-crop. However I don't think it's a problem related to the library, because I changed it and the same problem occurred again...

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Hi, I don't really know this library and without seeing the code there's actually very little I can do. Anyway, I believe the same issue might arise if the fragment was recreated in different scenarios mentioned by me earlier.
Are you sure you're using the library correctly, passing the right values as parameters, etc? Maybe this will help: http://stackoverflow.com/questions/20827237/failure-delivering-result-resultinfowho-null-request-1-result-1-data-intent ?

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I think that I'm using it correctly, to start the crop activity. The library has the method startCrop(Context) or something like that, to start cropping the selected Image. But in a fragment this method is .startCrop(getActivity(), StepFragment.this). And it work until the fragment has been destroyed.

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It looks lile an issue with the library to be honest or the the setup. The ViewPager in our library doesn't do anything special... Maybe this has something to do with jdamcd/android-crop#240 ? Does the crash occur if you try to start other activities and get the result from them?

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No, I get the crash only if I use this library, but the problem occur also with another library. This is why i think it's not a library issue

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Could you try it? Maybe I'm doing something wrong...

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Hi, I'm currently on my holidays and I only have access to my phone :/ maybe you could fork this library and add the library you're using to the sample app so that I could have the look at the code at least?

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Yes, I'll try. Keep in touch

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Could you tell me the class where I can find the ViewPager? I mean the class in which you get it with .findViewById

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This would be https://github.com/stepstone-tech/android-material-stepper/blob/master/material-stepper/src/main/java/com/stepstone/stepper/StepperLayout.java

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Is there a way to access the ViewPager from my activity?

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I want to try to use mViewPager.setOffScreenPageLimit(int) without modifying the library

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Technically speaking the ViewPager is a view so you can find it and use it in the activity the same way it is found and used in the StepperLayout?

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Solved. Using mViewPager.setOffScreenPageLimit(int) solved the problem. As I thought it wasn't a problem related to the library. Thank you for your patience @zawadz88 👍

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