java.lang.NullPointerException: Attempt to invoke interface method 'android.content.SharedPreferences$Editor android.content.SharedPreferences$Editor.putString(java.lang.String, java.lang.String)' on a null object reference

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    Using SharedPreferences for custom ArrayList -- Adapter or Editor error?

    Stack Overflow | 6 months ago | Jonathon Charles Loch
    java.lang.NullPointerException: Attempt to invoke interface method 'android.content.SharedPreferences$Editor android.content.SharedPreferences$Editor.putString(java.lang.String, java.lang.String)' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke interface method 'android.content.SharedPreferences$Editor android.content.SharedPreferences$Editor.putString(java.lang.String, java.lang.String)' on a null object reference

      at com.lochdownstudios.simplePurchaseOrderer.MainActivity.save()
    2. com.lochdownstudios.simplePurchaseOrderer
      MainActivity.onCreate
      1. com.lochdownstudios.simplePurchaseOrderer.MainActivity.save(MainActivity.java:119)
      2. com.lochdownstudios.simplePurchaseOrderer.MainActivity.onCreate(MainActivity.java:39)
      2 frames
    3. Android Platform
      ActivityThread.handleLaunchActivity
      1. android.app.Activity.performCreate(Activity.java:6876)
      2. android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
      3. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
      4. android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
      4 frames