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Attempt to invoke virtual method 'int java.util.ArrayList.size()' on a null object reference
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(MainActivity.java:48)	at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1257)	at android.app.Activity.performResume(Activity.java:6076)	at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3039)	at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3081)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2447)	at android.app.ActivityThread.access$800(ActivityThread.java:156)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:211)	at android.app.ActivityThread.main(ActivityThread.java:5389)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)