Menu
I have been programming for Android with decent success, but one thing I have noticed is that when I get NullPointerExceptions the stack trace is worthless. They are always of this format:
Thread [<1> main] (Suspended (exception NullPointerException))
ViewRoot.draw(boolean) line: 1431
ViewRoot.performTraversals() line: 1163
ViewRoot.handleMessage(Message) line: 1727
ViewRoot(Handler).dispatchMessage(Message) line: 99
Looper.loop() line: 123
ActivityThread.main(String[]) line: 4627
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]
Method.invoke(Object, Object...) line: 521
ZygoteInit$MethodAndArgsCaller.run() line: 868
ZygoteInit.main(String[]) line: 626
NativeStart.main(String[]) line: not available [native method]
Usually stack traces tell you right where the code blew up, but I always seem to get the most generic one possible. Am I missing something obvious? Thanks.
781
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.
NullPointerException is thrown when a reference variable is accessed (or de-referenced) and is not pointing to any object. This error can be resolved by using a try-catch block or an if-else condition to check if a reference variable is null before dereferencing it.
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.
Programmers typically catch NullPointerException under three circumstances: The program contains a null pointer dereference. Catching the resulting exception was easier than fixing the underlying problem. The program explicitly throws a NullPointerException to signal an error condition.
If you are using Eclipse, look at LogCat in the DDMS or Debug perspectives. It will show you the stack trace of the exception itself and that of the code that caused it.
65
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
