java.lang.RuntimeException

Unable to start activity ComponentInfo{com.example.joe.helloworld/com.example.joe.helloworld.MainActivity}: 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 web45834

  • via Stack Overflow by onyex
    , 10 months ago
    Unable to start activity ComponentInfo{com.example.joe.helloworld/com.example.joe.helloworld.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  • via GitHub by vikaskumar-vsk
    , 5 months ago
    Unable to start activity ComponentInfo{com.vikaskumar.vsk.buttoncumgesture/com.vikaskumar.vsk.buttoncumgesture.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  • Unable to start activity ComponentInfo{io.appium.android.apis/io.appium.android.apis.app.StatusBarNotifications}: 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.example.joe.helloworld/com.example.joe.helloworld.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)

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