还在用startActivityForResult处理数据传递？试试ActivityResultContract吧

class CustomResultContracts : ActivityResultContract<Int, String>() {
    override fun createIntent(context: Context, input: Int?): Intent {
        return Intent(context, DestinishActivity::class.java).putExtra("input",input)
    }
    override fun parseResult(resultCode: Int, intent: Intent?): String {
        return intent?.getStringExtra("data") ?: "未返回数据"
    }
}
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private val customContract = registerForActivityResult(CustomResultContracts()){
        getData(14).content="自定义Contracts返回数据：$it"
        getData(14).notifyDataSetChange()
    }
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customContract.launch(1)
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//注册结果监听
registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
            if (it.resultCode == 3) {
                showResult(it.data?.getStringExtra("data"))
            }
        }
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//启动activity，参数传intent
startForResult.launch(Intent(this@MainActivity, DestinishActivity::class.java))
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registerForActivityResult(ActivityResultContracts.TakePicturePreview()) {
            getData(1).let {
                it.notifyDataSetChange()
            }
        }
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private val takePreviewPic = registerForActivityResult(ActivityResultContracts.TakePicture()) {
        logEE("搞预览图片成功")
    }
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private val captureVideo = registerForActivityResult(ActivityResultContracts.CaptureVideo()) {
        logEE("拍摄视频成功:$it")
    }
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cameraPermission.launch(Manifest.permission.CAMERA)
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private val cameraPermission =
        registerForActivityResult(ActivityResultContracts.RequestPermission()) {
            getData(3).apply {
                content = "请求相机权限结果$it"
                notifyDataSetChange()
            }
        }
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mutlePermission.launch(
                    arrayOf(
                        Manifest.permission.CAMERA,
                        Manifest.permission.READ_EXTERNAL_STORAGE,
                        Manifest.permission.WRITE_EXTERNAL_STORAGE
                    )
                )
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registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) {
            var result = ""
            it.forEach { gaint ->
                result += "获取${gaint.key} 权限 ${if (gaint.value) "成功" else "失败"}"
            }
            getData(4).content = result
            getData(4).notifyDataSetChange()
        }
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pickContact.launch(null)//参数传空
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private val pickContact = registerForActivityResult(ActivityResultContracts.PickContact()) {
        logEE(it.toString())
        getData(8).apply {
            content = it.toString()
            notifyDataSetChange()
        }
    }
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getContent.launch("image/*")
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private val getContent = registerForActivityResult(ActivityResultContracts.GetContent()) {
        logEE(it.toString())
    }
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override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        view.findViewById<Button>(R.id.btn).setOnClickListener {
            request.launch(Intent(activity, DestinishActivity::class.java))//启动新activity
        }
    }
    /**
     * 注册结果监听
     */
    val request = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
        logEE(it.data?.getStringExtra("data")!!)
    }
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implementation 'androidx.fragment:fragment-ktx:1.3.0'
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private val launcher:ActivityResultLauncher<Intent> = registerForActivityResult(ActivityResultContracts.StartActivityForResult()){ result ->
    if (result.resultCode == Activity.RESULT_OK){
        binding.tvSend.text = result.data?.getIntExtra("nums",-1).toString()
    }
}
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launcher.launch(Intent(requireContext(),Comm2Activity::class.java))
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binding.btnReturndata.setOnClickListener {
    requireActivity().setResult(Activity.RESULT_OK,Intent().apply {
        putExtra("nums",123)
    })
    requireActivity().finish()
}
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