android - 在 Androidx 上使用 registerForActivityResult 选择文件

Question

我需要在我的 webviewActivity 中实现选择文件选项，我发现的所有教程都只有带有 startActivityResult 的示例，但它目前已被弃用，所以我想要一些关于如何将此代码转换为新模板的帮助如文档中所示: https://developer.android.com/training/basics/intents/result 。
WebviewActivity.kt

class WebviewActivity: AppCompatActivity() {
val REQUEST_SELECT_FILE = 1
val FILE_CHOOSER_RESULT = 2
var uploadMessage: ValueCallback<Array<Uri>>? = null
var uploaded: ValueCallback<Uri>? = null

private fun launchWebview(url: String): WebView =
    webview_id.apply{
        loadUrl(url)
        webViewClient : object = WebViewClient(){
            //...//
        }

        webChromeClient : object = WebChromeClient(){
            override fun onShowFileChooser(
                webView: WebView?,
                filePathCallback: ValueCallback<Array<Uri>>?,
                fileChooserParams: WebChromeClient.FileChooserParams
            ): Boolean{
                if (uploadMessage != null){
                    uploadMessage!!.onReceiveValue(null)
                    uploadMessage = null
                }

                uploadMessage = filePathCallback
                val intent = fileChooserParams.createIntent()

                startActivityForResult(intent, REQUEST_SELECT_FILE)

                return true
            }
        }
    }

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    if (requestCode == REQUEST_SELECT_FILE){
        uploadMessage!!.onReceiveValue(
            WebChromeClient.FileChooserParams.parseResult(
                resultCode, data
            )
        )
        uploadMessage = null
    } else if (requestCode == FILE_CHOOSER_RESULT){
        val result = if (data == null || resultCode != RESULT_OK) null else data.data
        uploaded!!.onReceiveValue(result)
        uploaded = null
    }
    super.onActivityResult(requestCode, resultCode, data)
}
}

我使用这个链接来制作上面的代码:Android File Chooser not calling from Android Webview

Answer 1

你必须做某事。像那样:

private fun createFile() {
  getResult.launch("chartName.pdf")
}

private val getResult = registerForActivityResult(
  CreateSpecificTypeDocument("application/pdf")
) { uri ->
  if(uri != null){
    contentResolver.openFileDescriptor(uri, "w")?.use {
      FileOutputStream(it.fileDescriptor).use { fileOutputStream ->
        //DO sth. with file
      }
    }
  }
}

和:

class CreateSpecificTypeDocument(private val type: String) :
  ActivityResultContracts.CreateDocument() {
  override fun createIntent(context: Context, input: String): Intent {
    return super.createIntent(context, input).setType(type)
  }
}