This:
@Nullable Item[] mItems; public Item getItem(int position) { return mItems[position]; }
produces the warning:
Array access 'mItems[position]' may produce NullPointerException
I want to suppress this warning (I know that getItem()
will not be called if mItems
is null).
I've tried using the following annotations:
@SuppressWarnings({"NullableProblems"})
@SuppressWarnings({"null"})
as well as with the //noinspection
notation, but they're all not working.
Using @SuppressWarnings({"all"})
works, but it's obviously not what I'm looking for.
Android Studio doesn't offer any suppression option when I hit alt + enter, just the options to add a (useless) null check.
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.
Answer: Some of the best practices to avoid NullPointerException are: Use equals() and equalsIgnoreCase() method with String literal instead of using it on the unknown object that can be null. Use valueOf() instead of toString() ; and both return the same result. Use Java annotation @NotNull and @Nullable.
java.lang.NullPointerException. Thrown when an application attempts to use null in a case where an object is required. These include: Calling the instance method of a null object. Accessing or modifying the field of a null object.
This works for me, but not sure why AS would want to use constant conditions as the suppressor. I think it has something to do with the skip null check as it's a constant condition (i.e., it'll always not be null).
@Nullable Item[] mItems; @SuppressWarnings("ConstantConditions") public Item getItem(int position) { return mItems[position]; }
If you want to prevent Android Studio from bothering you with those warnings while keeping them in the compiler simply go to Settings -> Editor -> Inspections -> Constant Conditions and Exceptions and uncheck it.
If instead you want to completely remove it then use the proper SuppressWarnings as suggested by the other answers :
@SuppressWarnings("ConstantConditions")
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