所以我正在尝试在Android Studio中构建一个登录应用程序,当我测试它时,应用程序因某些原因崩溃了.我只是在查看日志以找出问题,但我不能为此异常错误做到这一点.贴在下面是我的日志.
02-09 16:18:09.482 2467-2467/? I/art: Not late-enabling -Xcheck:jni (already on)
02-09 16:18:09.585 2467-2467/edu.dtcc.bwharto9.loginform W/System: ClassLoader referenced unknown path: /data/app/edu.dtcc.bwharto9.loginform-2/lib/x86
02-09 16:18:09.590 2467-2467/edu.dtcc.bwharto9.loginform D/AndroidRuntime: Shutting down VM
02-09 16:18:09.590 2467-2467/edu.dtcc.bwharto9.loginform E/AndroidRuntime: FATAL EXCEPTION: main
Process: edu.dtcc.bwharto9.loginform, PID: 2467
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{edu.dtcc.bwharto9.loginform/edu.dtcc.bwharto9.loginform.MainActivity}:
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
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: …