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I had implemented inApp purchase in my application but sometimes it gives me NPE, below is stack trace. I can post the code also if anyone interested.
java.lang.RuntimeException: Unable to start service com.market.BillingService@48400380 with null: java.lang.NullPointerException
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3063)
at android.app.ActivityThread.access$3600(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2096)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:871)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.market.BillingService.handleCommand(BillingService.java:369)
at com.market.BillingService.onStart(BillingService.java:359)
at android.app.Service.onStartCommand(Service.java:420)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3053)
... 10 more
java.lang.NullPointerException
at com.market.BillingService.handleCommand(BillingService.java:369)
at com.market.BillingService.onStart(BillingService.java:359)
at android.app.Service.onStartCommand(Service.java:420)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3053)
at android.app.ActivityThread.access$3600(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2096)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:871)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
at dalvik.system.NativeStart.main(Native Method)
Here goes relevant code
@Override
protected void onStart() {
super.onStart();
ResponseHandler.register(mDungeonsPurchaseObserver);
}
@Override
protected void onStop() {
super.onStop();
ResponseHandler.unregister(mDungeonsPurchaseObserver);
}
@Override
protected void onDestroy() {
super.onDestroy();
mBillingService.unbind();
}
And in OnCreate()
mDungeonsPurchaseObserver = new WMBPurchaseObserver(mHandler);
mBillingService = new BillingService();
mBillingService.setContext(BuyModel.this);
ResponseHandler.register(mDungeonsPurchaseObserver);
onClick of buy Button
if (!mBillingService.checkBillingSupported())
{
showDialog(DIALOG_CANNOT_CONNECT_ID);
}
mBillingService.requestPurchase("android.test.purchased", null);
305
How to fix the NullPointerException? To avoid NullPointerException we have to initialize the Textview component with the help of findviewbyid( ) method as shown below. The findViewbyId( ) takes the “id” value of the component as the parameter. This method helps locate the component present in the app.
How to avoid the NullPointerException? To avoid the NullPointerException, we must ensure that all the objects are initialized properly, before you use them. When we declare a reference variable, we must verify that object is not null, before we request a method or a field from the objects.
NullPointerException is a runtime exception in Java that occurs when a variable is accessed which is not pointing to any object and refers to nothing or null. Since the NullPointerException is a runtime exception, it doesn't need to be caught and handled explicitly in application code.
A null pointer exception is thrown when an application attempts to use null in a case where an object is required. These include: Calling the instance method of a null object. Accessing or modifying the field of a null object. Taking the length of null as if it were an array.
In your BillingService.java onStart method guard for null intent like this
if (null != intent) {
handleCommand(intent, startId);
}
I believe this is caused by null intent. Try out!
115
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