java.lang.RuntimeException

Unable to start activity ComponentInfo{com.sgsoft.android.sgscl/com.sgsoft.android.sgscl.SignupActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

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Solutions on the web45833

  • Unable to start activity ComponentInfo{com.sgsoft.android.sgscl/com.sgsoft.android.sgscl.SignupActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  • via Stack Overflow by carlos1990
    , 1 year ago
    Unable to start activity ComponentInfo{com.cm.georganizer/com.cm.georganizer.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  • Unable to start activity ComponentInfo{be.ehb.dt.bestellingen/be.ehb.dt.bestellingen.Winkel}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  • Stack trace

    • java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sgsoft.android.sgscl/com.sgsoft.android.sgscl.SignupActivity}: 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:2348) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2410) at android.app.ActivityThread.access$800(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1313) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5351) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:947) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:742) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference at com.sgsoft.android.sgscl.SignupActivity.onCreate(SignupActivity.java:28) at android.app.Activity.performCreate(Activity.java:6012) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292) ... 10 more

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