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ftctechnh / ftc_app

FTC Android Studio project to create FTC Robot Controller app.
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App crashed due to android.jar permission issue from OnBotJavaManager #704

Closed twang11 closed 5 years ago

twang11 commented 5 years ago

This happened on some of my E4 phones and all of my G4 phones. App crashed right after pushing the new robot controller app.

Phones are running Android 7.1.1 (version 25)

     Caused by: java.io.FileNotFoundException: /storage/emulated/0/FIRST/java/lib/android.jar (Permission denied)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:169)
        at org.firstinspires.ftc.robotcore.internal.system.AppUtil.copyStream(AppUtil.java:412)
        at org.firstinspires.ftc.robotcore.internal.opmode.OnBotJavaManager.extractJavaLibraryAsset(OnBotJavaManager.java:239)
NoahAndrews commented 5 years ago

Did you increase the SDK target version in response to an Android Studio warning? If so, set the SDK target back to 19. Future releases will target 26 without encountering this error.

twang11 commented 5 years ago

reversed back to 19, worked. Wondering why target 26 worked for some E4 phones (2 out of 4).

cmacfarl commented 5 years ago

@twang11 The answer is wrapped up in Google's permissions model.

More information than you probably really want here.

https://developer.android.com/guide/topics/permissions/overview

Next year's SDK and Driver Station, will by necessity, e.g. Google decree, ask for permissions when first run. In the meantime don't push the target sdk past 23 and run on an Android 6.0+ phone.