Android FATAL exception:main NULL pointer exception

Before a teammate wrote the code, these days are integrated. Found a button in the English name error, changed the Java file inside, but forgot to change the XML file inside the ID

Android FATAL exception:main Null pointer exception, throws this exception when prompted the wrong place in the Onmeasure method Super.onmeasure (Widthmeasurespec, HEIGHTMEASURESPEC);

There is a button click event in fragment, there is a button in front of the button, but the error is not reported there.

Finally found that the original XML layout file button ID and Java file Findviewbyid ID does not match, very surprised at the time when writing no problem, how to compile the error.

Android FATAL exception:main NULL pointer exception