java.lang.NullPointerException: Attempt to invoke virtual method 'int java.util.ArrayList.size()' on a null object reference

Stack Overflow | Joseph Joey | 4 months ago
  1. 0

    NullPointerException when reading from Database

    Stack Overflow | 4 months ago | Joseph Joey
    java.lang.NullPointerException: Attempt to invoke virtual method 'int java.util.ArrayList.size()' on a null object reference
  2. 0
    Initialize the variable before calling a method on it.
  3. 0
    Use 'dialog' to access views from custom_layout layout.
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  5. 0
    The resource was accessed after it was dismissed.
  6. 0

    Crash

    GitHub | 1 year ago | SlideAutoreport
    java.lang.NullPointerException: Attempt to invoke virtual method 'int java.util.ArrayList.size()' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'int java.util.ArrayList.size()' on a null object reference

      at com.example.joey.sqlite.MainActivity.onResume()
    2. com.example.joey
      MainActivity.onResume
      1. com.example.joey.sqlite.MainActivity.onResume(MainActivity.java:48)
      1 frame
    3. Android Platform
      ActivityThread.main
      1. android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1257)
      2. android.app.Activity.performResume(Activity.java:6076)
      3. android.app.ActivityThread.performResumeActivity(ActivityThread.java:3039)
      4. android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3081)
      5. android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2447)
      6. android.app.ActivityThread.access$800(ActivityThread.java:156)
      7. android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
      8. android.os.Handler.dispatchMessage(Handler.java:102)
      9. android.os.Looper.loop(Looper.java:211)
      10. android.app.ActivityThread.main(ActivityThread.java:5389)
      10 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:372)
      2 frames
    5. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
      2 frames