앱을 종료할 때 에러가 납니다

Question

    protected void onDestroy() {
        try{
            out.close();
            fos.close();
        }catch(IOException e){
            e.printStackTrace();
        }
        super.onDestroy();
    }


Process: com.example.hello.myapplication, PID: 23296
                                                                                 java.lang.RuntimeException: Unable to destroy activity {com.example.seokh.myapplication/com.example.seokh.myapplication.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void java.io.FileInputStream.close()' on a null object reference
                                                                                     at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4561)
                                                                                     at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4584)
                                                                                     at android.app.ActivityThread.-wrap7(ActivityThread.java)
                                                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1689)
                                                                                     at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                     at android.os.Looper.loop(Looper.java:154)
                                                                                     at android.app.ActivityThread.main(ActivityThread.java:6646)
                                                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
                                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
                                                                                  Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void java.io.FileInputStream.close()' on a null object reference
                                                                                     at com.example.seokh.myapplication.MainActivity.onDestroy(MainActivity.java:74)
                                                                                     at android.app.Activity.performDestroy(Activity.java:7165)
                                                                                     at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1161)
                                                                                     at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4548)
                                                                                     at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4584) 
                                                                                     at android.app.ActivityThread.-wrap7(ActivityThread.java) 
                                                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1689) 
                                                                                     at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                     at android.os.Looper.loop(Looper.java:154) 
                                                                                     at android.app.ActivityThread.main(ActivityThread.java:6646) 
                                                                                     at java.lang.reflect.Method.invoke(Native Method) 
                                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 
                                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358) 

 

onDestroy말고 다른 메서드에선  close메서드를 부르는 곳이 없고 저장도 멀쩡히 됩니다. 그런데 닫고 나면 nullpointerException이 발생하네요. 

out.close;와 fos.close;를 주석처리하면 에러는 없는데 저장은 안되구요. onDestroy에서 닫으면 안되는 건가요???

 

 

Comments

오 해결했습니다. 혹시나해서 fos.close;를 주석처리 하니 문제없이 돌아가네요 혹시 비슷한 문제로 고민하시는 분들 보시라고 남겨둡니다

Answer 1

에러 메세지에서 'fos' 변수가 null 값이라고 하네요.

'IOException'으로 'NullPointerException'까지 catch할 수는 없습니다.