急！！！ java編程！ 求大神幫助！ 題目如下圖： 寫壹個driver program ， p

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.garena.game.lfstw/com.aiming.lfs.LFSActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'boolean java.util.List.isEmpty()' on a null object reference

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2421)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481)

at android.app.ActivityThread.access$900(ActivityThread.java:153)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1349)

at android.os.Handler.dispatchMessage(Handler.java:102)

at android.os.Looper.loop(Looper.java:148)

at android.app.ActivityThread.main(ActivityThread.java:5432)

at java.lang.reflect.Method.invoke(Native Method)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:735)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)

Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'boolean java.util.List.isEmpty()' on a null object reference

at com.aiming.lfs.billing.util.IabHelper.startSetup(IabHelper.java:269)

at com.aiming.lfs.billing.BillingProcessor.setupBilling(BillingProcessor.java:64)

at com.aiming.lfs.billing.BillingProcessor.initialize(BillingProcessor.java:38)

at com.aiming.lfs.LFSActivity.onCreate(LFSActivity.java:89)

at android.app.Activity.performCreate(Activity.java:6289)

at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108

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