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Question

2019-09-04 17:58:48.616 767-767/kr.co.cashq.fileinputoutput W/System.err: java.io.FileNotFoundException: /storage/emulated/0/Android/data/kr.co.cashq.fileinputoutput/sd_file.dat: open failed: ENOENT (No such file or directory) 2019-09-04 17:58:48.616 767-767/kr.co.cashq.fileinputoutput W/System.err: at libcore.io.IoBridge.open(IoBridge.java:496) 2019-09-04 17:58:48.616 767-767/kr.co.cashq.fileinputoutput W/System.err: at java.io.FileOutputStream.(FileOutputStream.java:235) 2019-09-04 17:58:48.616 767-767/kr.co.cashq.fileinputoutput W/System.err: at java.io.FileOutputStream.(FileOutputStream.java:125) 2019-09-04 17:58:48.616 767-767/kr.co.cashq.fileinputoutput W/System.err: at kr.co.cashq.fileinputoutput.MainActivity.btn3Method(MainActivity.java:124) 2019-09-04 17:58:48.616 767-767/kr.co.cashq.fileinputoutput W/System.err: at java.lang.reflect.Method.invoke(Native Method) 2019-09-04 17:58:48.616 767-767/kr.co.cashq.fileinputoutput W/System.err: at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385) 2019-09-04 17:58:48.616 767-767/kr.co.cashq.fileinputoutput W/System.err: at android.view.View.performClick(View.java:7140) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at android.view.View.performClickInternal(View.java:7117) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at android.view.View.access$3500(View.java:801) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at android.view.View$PerformClick.run(View.java:27351) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at android.os.Handler.handleCallback(Handler.java:883) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at android.os.Handler.dispatchMessage(Handler.java:100) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at android.os.Looper.loop(Looper.java:214) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at android.app.ActivityThread.main(ActivityThread.java:7356) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at java.lang.reflect.Method.invoke(Native Method) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory) 2019-09-04 17:58:48.617 767-767/kr.co.cashq.fileinputoutput W/System.err: at libcore.io.Linux.open(Native Method) 2019-09-04 17:58:48.618 767-767/kr.co.cashq.fileinputoutput W/System.err: at libcore.io.ForwardingOs.open(ForwardingOs.java:167) 2019-09-04 17:58:48.618 767-767/kr.co.cashq.fileinputoutput W/System.err: at libcore.io.BlockGuardOs.open(BlockGuardOs.java:252) 2019-09-04 17:58:48.618 767-767/kr.co.cashq.fileinputoutput W/System.err: at libcore.io.ForwardingOs.open(ForwardingOs.java:167) 2019-09-04 17:58:48.618 767-767/kr.co.cashq.fileinputoutput W/System.err: at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:7255) 2019-09-04 17:58:48.618 767-767/kr.co.cashq.fileinputoutput W/System.err: at libcore.io.IoBridge.open(IoBridge.java:482) 2019-09-04 17:58:48.618 767-767/kr.co.cashq.fileinputoutput W/System.err: ... 16 more 위와 같이 파일을 쓸 수 없다고 하네요. 뭘 잘못 한거죠?

문태부 · Answer

https://www.inflearn.com/course/android-pie-9-0-2/lecture/15989 이 강의 입니다.