在 Android Studio 中抑制潜在的 NullPointerException [英] Suppress potential NullPointerException in Android Studio

问题描述

这个:

@Nullable
Item[] mItems;

public Item getItem(int position) {
    return mItems[position];
}

产生警告:

Array access 'mItems[position]' may produce NullPointerException

我想取消此警告(我知道如果 mItems 为 null，则不会调用 getItem()).

I want to suppress this warning (I know that getItem() will not be called if mItems is null).

我尝试使用以下注释:

• @SuppressWarnings({"NullableProblems"})
• @SuppressWarnings({"null"})

以及 //noinspection 符号，但它们都不起作用.

as well as with the //noinspection notation, but they're all not working.

使用 @SuppressWarnings({"all"}) 有效，但这显然不是我想要的.

Using @SuppressWarnings({"all"}) works, but it's obviously not what I'm looking for.

当我点击 alt + enter 时，Android Studio 不提供任何抑制选项，只是添加(无用的)空检查的选项.

Android Studio doesn't offer any suppression option when I hit alt + enter, just the options to add a (useless) null check.

推荐答案

这对我有用，但不确定为什么 AS 要使用常量条件作为抑制器.我认为这与跳过空检查有关，因为它是一个恒定条件(即，它永远不会为空).

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];
}

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