在片段导航组件之间传递数据的更好方法? [英] Better way to pass data between Fragments Navigation Component?

问题描述

在导航组件中的片段之间传递数据很容易.假设从 A 到 B ，只需使用 SafeArgs 设置 arguments ，就可以完成.

Passing data between Fragments in Navigation Component is easy. Say going from A to B you just set arguments with SafeArgs and you are done.

但是，当将数据从 B 传递回 A 时，它变得棘手.

But, it gets tricky when passing data from B back to A.

根据文档，我们可以使用 SharedViewModel效果很好.但是我正在寻找更好的方法将数据从 B 传递回 A .

According to documentation, we can use SharedViewModel which is works well. But I am looking for better way of passing data back to A from B.

使用 SharedViewModel 的问题是，您必须为需要传递数据的每个片段对创建 SharedViewModel .

The problem of using SharedViewModel is, you have to create SharedViewModel for every fragment pair that you need to pass data.

有什么建议吗?如果您可以考虑使用任何注释处理方法，欢迎您提出建议.

Any suggestions? If any annotation-processing method you can think about, you are more than welcome to recommend.

推荐答案

如果您不想使用 SharedViewModel 方式，则可以采用下一种方法:

If you do not want to use SharedViewModel way, you can follow the next approach:

1-为您的 Details Fragment 定义一个委托.(该代表必须实现 Serializable 或 Parcelable :

1- Define a delegate for your Details Fragment. (This delegate have to implement Serializable or Parcelable:

interface DetailsFragmentDelegate: Serializable {
    fun onSomething1(someData1: SomeData1)
    fun onSomething2(someData2: SomeData2)
}

2- 将委托添加到 nav_graph.xml

3- 将委托传递给您的 Details Fragment 时，通过您的 Base Fragment 定位到目的地:

3- Pass the delegate to your Details Fragment when navigating to its destination by your Base Fragment:

findNavController().navigate(
    BaseFragmentDirections.actionBaseFragmentToDetailsFragment(
        object: DetailsFragmentDelegate {
            // override delegate methods

        }
    )
)

4- 在 Details Fragment 中获取委托参数，并将数据传递回您需要的位置:

4- Get the delegate argument in Details Fragment and pass the data back wherever you need:

....
delegate.onSomething1(data1)
....
delegate.onSomething2(data2)
....

我不确定是否有更好的方法，但是它正在起作用...

I am not sure whether there is a better way or not, but it's working...

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