使用Android Studio中的@NonNull标注正确的方式 [英] Right way to use the @NonNull annotation in Android Studio

问题描述

我想使用 @NonNull 标注在Android中，但我想不出只是做了正确的方式。
我建议你​​这个例子：

I'd like to use the @NonNull annotation in Android, but I can't figure out just the right way to do it. I propose you this example:

public void doStuff(@NonNull String s){
     //do work with s...    
}

所以，当我打电话 doStuff（空）的IDE会给我一个警告。问题是，我不能依靠这个注解，因为像<一个href=\"http://stackoverflow.com/questions/13484202/use-nullable-and-nonnull-java-annotations-more-effectivly\">this问题指出，他们不很远传播。所以我喜欢把一个空检查我的方法是这样的：

So when i call doStuff(null) the IDE will give me a warning. The problem is that I cannot rely on this annotation since, like this question points out, they don't propagate very far. So I'd like to put a null check on my method, like this:

 if(s==null) throw new IllegalAgrumentException();

但IDE，假设取值！= NULL ，会警告我说，取值== NULL 始终假。我想知道什么是做到这一点的最好办法。

But the IDE, assuming that s!=null, will warn me that s==null is always false. I'd like to know what is the best way to do this.

我个人认为应该有像 @ShouldntBeNull 的注释，仅的检查，并警告说，空不传递给它，但的不会当值为null检查的抱怨。

I personally think that there should be an annotation like @ShouldntBeNull that only checks and warns that null isn't passed to it, but doesn't complains when the value is null checked.

推荐答案

您可以使用注释式燮pression禁用特定空检查的警告，例如：

You can use the comment-style suppression to disable that specific null check warning, e.g.:

    public MyMethod(@NonNull Context pContext) {
        //noinspection ConstantConditions
        if (pContext == null) {
            throw new IllegalArgumentException();
        }
        ...
    }

您将需要一个 // noinspection ConstantConditions 每次你做的时间。

You'll need that //noinspection ConstantConditions every time you do it.

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