声明的arrayList无法识别-android

Question

I declared an ArrayList as follows (as I use to declare it) and then set its content. However, a notice message that I am not using declared "al" variable. It doesn't dissapear although I use it at following line. Content is also not set! Strange... why? Thank you

ArrayList<String> al = new ArrayList<String>();

al = parsedExampleDataSet.getView();

Answer 1

It means you are setting it but never reading it.

Apparently, you never access al except to assign it.

Also, you are creating a new ArrayList, and then discarding the object when you reassign it to parsedExampleDataSet.getView() . This probably has nothing to do with your error, but it's a waste.

Answer 2

try this:

ArrayList<String> al = null;

al = parsedExampleDataSet.getView();