如何使用 Kotlin 将数据从片段传输到 Android 中的 activity?

How to tranfer data from fragment to activity in Android using Kotlin?

这是我的代码:-

class ACFragment : Fragment() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val id = "ac"

        fb_ac.setOnClickListener {
            val intent = Intent(this@ACFragment, AddFunction::class.java)
            intent.putExtra("id", id)
            startActivity(intent)
        }

        return inflater.inflate(R.layout.fragment_ac, container, false)
    }
}

我想使用 Intent 将数据从片段传输到 activity,但我做不到。有人可以帮我吗?

您可以通过调用 getStringExtra 方法在 AddFunction activity 中检索 id 字符串:

override fun onCreate(savedInstanceState: Bundle) {
    ...

    val id = intent.getStringExtra("id") ?: ""
}

此外,您应该像这样更改 onCreateView 声明:

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    val view = inflater.inflate(R.layout.fragment_ac, container, false)

    val id = "ac"

    view.findViewById<Button>(R.id.fb_ac).setOnClickListener {
        val intent = Intent(requireContext(), AddFunction::class.java)
        intent.putExtra("id", id)
        startActivity(intent)
    }

    return view 
}