java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.Boolean.booleanValue()' on a null object reference

Stack Overflow | Akshay Singhal | 5 months ago
  1. 0

    Android calculator does not perform any calculation and crashes when equal button is pressed

    Stack Overflow | 5 months ago | Akshay Singhal
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.Boolean.booleanValue()' on a null object reference
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    The resource was accessed after it was dismissed.
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    The parsed JSON does not contains the requested field.
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  5. 0
    Initialize the variable before calling a method on it.
  6. 0
    Use 'dialog' to access views from custom_layout layout.

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'boolean java.lang.Boolean.booleanValue()' on a null object reference

      at jarvis.calc.MainActivity$16.onClick()
    2. jarvis.calc
      MainActivity$16.onClick
      1. jarvis.calc.MainActivity$16.onClick(MainActivity.java:187)
      1 frame
    3. Android Platform
      ActivityThread.main
      1. android.view.View.performClick(View.java:5198)
      2. android.view.View$PerformClick.run(View.java:21147)
      3. android.os.Handler.handleCallback(Handler.java:739)
      4. android.os.Handler.dispatchMessage(Handler.java:95)
      5. android.os.Looper.loop(Looper.java:148)
      6. android.app.ActivityThread.main(ActivityThread.java:5417)
      6 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    5. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
      2 frames