Android Jetpack导航库和onActivityResult

Question

我正在尝试将应用迁移到GoogleIO'18宣布的新导航架构组件

假设我需要使用通常以开始的活动startActivityForResult。该活动来自库活动或系统活动，因此我无法对其进行修改。

有什么方法可以将此活动作为目的地包含在导航图中并从中获取结果？

Answer 1

到目前为止，我唯一的解决方案是将该活动包装在一个捕获结果的片段后面，然后将其呈现给导航图：

class ScannerWrapperFragment : Fragment() {

    private val navController by lazy { NavHostFragment.findNavController(this) }

    override fun onResume() {
        super.onResume()
        // forward the call to ScannerActivity
        // do it in onResume to prevent call duplication from configuration changes
        val intent = Intent(context, ScannerActivity::class.java)
        startActivityForResult(intent, 4304357)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (requestCode == 4304357) {
            if (resultCode == RESULT_OK) {

                val params = Bundle().apply {
                    putString("scan_result", data?.extras?.getString("scan_result"))
                }
                //present the scan results to the navigation graph
                navController.navigate(R.id.action_scanner_to_result_screen, params)

            } else {
                navController.popBackStack()
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data)
        }

    }

}