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junior
Asked: 2022-06-19 05:28:23 +0800 CST 2022-06-19 05:28:23 +0800 CST

What is the correct way to define an annotation array in kotlin or java?

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What I have tried is this way:

val arrlay: Array<@LayoutRes Int> =[R.layout.tab_basales,R.layout.tab_pcs,R.layout.tab_portadores]

but it gives me the following error

Unsupported [Collection literals outside of annotations]
This annotation is not applicable to target 'type usage'
java

1 Answers

  1. Best Answer

    Your syntax is correct but it just @LayoutResdoesn't support that target.

    In Java it would be like this:

    int @LayoutRes [] arrlay = {R.layout.tab_basales,R.layout.tab_pcs, R.layout.tab_portadores};

    But keep in mind that the vast majority of annotations do not support this usage.

    @LayoutResit is used in parameters of a function to indicate that the value it receives must be the id of a layout and it only serves to show a warning if this is not true. On a property it doesn't make much sense because you already know what its value is going to be and anyway the linter doesn't work if the value comes out of a variable. You can safely remove it, and also remember to use array primitives whenever possible.

    val arrlay = intArrayOf(R.layout.tab_basales, R.layout.tab_pcs, R.layout.tab_portadores)

    IntArrayis the equivalent of int[](primitive) in Java, while Array<Int>is the equivalent of Integer[](boxed)

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