java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.report/com.example.report.started_report}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.CheckBox.setOnCheckedChangeListener(android.widget.CompoundButton$OnCheckedChangeListener)' on a null object reference

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    Android - A Checkbox when isChecked, shows button

    Stack Overflow | 5 months ago | HextechEnthusiast
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.report/com.example.report.started_report}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.CheckBox.setOnCheckedChangeListener(android.widget.CompoundButton$OnCheckedChangeListener)' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.widget.CheckBox.setOnCheckedChangeListener(android.widget.CompoundButton$OnCheckedChangeListener)' on a null object reference

      at com.example.relatoriodeobras.started_alvara.onCreate()
    2. com.example.relatoriodeobras
      started_alvara.onCreate
      1. com.example.relatoriodeobras.started_alvara.onCreate(started_alvara.java:21)
      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