FileInputStream can't read file in Android R

Question

File file = new File(filePath);
InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);

simple piece of code. i checked the following:

file!=null
file.isFile()
file.exists()
file.canRead()

everything is true. The program have the permission and can actually read this existing file, but put it in a FileInputStream, it throws the following exception:

     java.io.FileNotFoundException: /storage/emulated/0/XNR/Setting.gson: open failed: EFAULT (Bad address)
        at libcore.io.IoBridge.open(IoBridge.java:492)
        at java.io.FileInputStream.<init>(FileInputStream.java:159)
        ...
     Caused by: android.system.ErrnoException: open failed: EFAULT (Bad address)
        at libcore.io.Linux.open(Native Method)
        at libcore.io.ForwardingOs.open(ForwardingOs.java:166)
        at libcore.io.BlockGuardOs.open(BlockGuardOs.java:254)
        at libcore.io.ForwardingOs.open(ForwardingOs.java:166)
        at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:7372)
        at libcore.io.IoBridge.open(IoBridge.java:478)
        at java.io.FileInputStream.<init>(FileInputStream.java:159) 
        ... 

it works well only on a api 23 emulator now. maybe the issue is cause by some new mechanics of newer version android api?

funny thing is, i developed and tested it on a android r emulator exclusively 2 months ago and everything is fine, after tested on several actuall devices, the project was deemed done and finished, it sat in my hard drive untouched for 2 months, i can even see the same.gson file generated by it. almost looks like it just went bad on it's own.

Answer 1

Using getFilesDir() or getExternalFilesDir(String) to access storage instead of using Environment.getExternalStorageDirectory() solved the problem, android no longer supports that since q based on the comment above.