问题
I search for answer all day long, but when i try to get the table layout i am having null. I found info that it may be another table layout with same name, but there is only one. My .xml file :
my xml
and my code is here layout6 = (TableLayout)findViewById(R.id.shdslResultsTableLayout);
layout6.setVisibility(0);
always ends up with null pointer. Please help.
回答1:
If findViewById() is returning a NPE, try some of these:
- Clean the project via Project -> Clean... -> check your project -> OK
- Ensure you have absolutely no spelling errors in the ID
- Make sure the contentView is displaying the correct layout where the
TableLayoutexists - Make sure you
setContentViewbeforefindViewById
I'm assuming the 3rd option I've listed is most likely your problem.
Re-cleaning the project may also help after each of these steps.
回答2:
Please make sure you call the right layout in the setContentView method, and make sure you call setContentView BEFORE calling findViewById.
If you made that, then try to clean / rebuild.
Hope this will help you
来源：https://stackoverflow.com/questions/11671409/tablelayoutfindviewbyid-null-pointer-exception