java.lang.RuntimeException: Unable to start activity ComponentInfo{com.bignerdranch.android.assignment2/com.bignerdranch.android.assignment2.NewSessionActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

Stack Overflow | mm24mm | 5 months ago
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    Android Studio Emulator keeps crashing when I run and press buttons on my layouts?

    Stack Overflow | 5 months ago | mm24mm
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.bignerdranch.android.assignment2/com.bignerdranch.android.assignment2.NewSessionActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

      at com.bignerdranch.android.assignment2.NewSessionActivity.onCreate()
    2. com.bignerdranch.android
      NewSessionActivity.onCreate
      1. com.bignerdranch.android.assignment2.NewSessionActivity.onCreate(NewSessionActivity.java:40)
      1 frame
    3. Android Platform
      ActivityThread.performLaunchActivity
      1. android.app.Activity.performCreate(Activity.java:5990)
      2. android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
      3. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
      3 frames