Android fatal exception: the main NULL pointer is abnormal. androidfatal

Android fatal exception: the main NULL pointer is abnormal. androidfatal

The code written by a teammate has been integrated over the past few days. I found a Button with an English name error. I changed the java file but forgot to change the id in the xml file.

Android fatal exception: the main NULL pointer EXCEPTION. When this EXCEPTION is thrown, the system prompts super. onMeasure (widthMeasureSpec, heightMeasureSpec) in the onMeasure method );

There is also a button click event in Fragment. There is a button in front of this Button, but the error is not reported.

Finally, we found that the button id of the original xml layout file does not match the id in the findViewById of the java file. I was surprised that there was no problem during the writing and the error was reported during compilation.