java - Files not saving if app is installed from APK -

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my app doesn't save files in internal storage if installed apk if installed ide adb saving. apk generated build/build apk

i solved problem. don't know why when using

fileoutputstream fos = new fileoutputstream(file);

it wasnt working, when changed to:

fileoutputstream fos = context.openoutputstream("file.txt", context.mode_private);

it works fine.


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