블루투스 통신 버튼클릭시 이렇게뜨는데 어떻게해야할지 모르겠네요

Question

08-14 02:42:11.072 17828-17828/com.example.jungs.test1 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.jungs.test1, PID: 17828
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothAdapter.isEnabled()' on a null object reference
        at com.example.jungs.test1.MainActivity.bluetoothOn(MainActivity.java:205)
        at com.example.jungs.test1.MainActivity$2.onClick(MainActivity.java:120)
        at android.view.View.performClick(View.java:4780)
        at android.view.View$PerformClick.run(View.java:19866)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5254)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

Answer 1

bluetoothadapter 객체가 null이라서 발생되는 에러에요 bluetoothdapter를 선언한 코드를 봐야 알수있습니다