If I save a file without any path name .. e.g. "abc.txt" ... where would it be saved on the device ?
where should I look in emulator file system if to try to find a file I saved?
/data/data/your.app.package.name/files, but note this can be device dependent so you should follow CommonsGuy's advice!
If I save a file without any path name .. e.g. "abc.txt" ... where would it be saved on the device ?
Don't do that.
Use getFilesDir() to get at the root of your application-local file area on internal storage. Or, use openFileOutput(), which gives you an OutputStream to a file in the directory identified by getFilesDir().
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