안드로이드 스튜디오 오류가 떠요

[익명(222.235)]

코딩을 하면

 

 

이런식으로 뜨고 정지가 나는데

 

제가 이걸 이클립스에서 코딩해서 구동되는걸 그대로 가져온거 거든요 왜 그러는 걸까요??

 

밑에는 오류 내용이에요

 

 

08-23 11:00:56.418 11783-11783/com.example.administrator.myapplication22 E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                           Process: com.example.administrator.myapplication22, PID: 11783
                                                                                           java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.administrator.myapplication22/com.example.administrator.myapplication22.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
                                                                                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                                               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                                               at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                                               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                                               at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                               at android.os.Looper.loop(Looper.java:148)
                                                                                               at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                                               at java.lang.reflect.Method.invoke(Native Method)
                                                                                               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                                            Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
                                                                                               at com.example.administrator.myapplication22.MainActivity.onCreate(MainActivity.java:24)
                                                                                               at android.app.Activity.performCreate(Activity.java:6237)
                                                                                               at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                                                                                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                                                                                               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                                                                                               at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                                                                                               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                                                                                               at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                               at android.os.Looper.loop(Looper.java:148) 
                                                                                               at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                                               at java.lang.reflect.Method.invoke(Native Method) 
                                                                                               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)