File Upload is not working in Android WebView

Question

For me, file upload isn\'t working in Android WebView. I\'ve tried testing it on Android KitKat, Lollipop and newer versions but it\'s still not working.

He

Answer 1

This is the only one that worked for me,

This is the Kotlin code for the same.

Variables declaration :

private var mUploadMessage:ValueCallback<Uri>? = null

var uploadMessage:ValueCallback<Array<Uri>>? = null

val REQUEST_SELECT_FILE = 100

Set this webchromeclient to your webview

    webViewMainActivity?.webChromeClient = object:WebChromeClient() {

        override fun onJsAlert(view: WebView, url: String, message: String, result: JsResult): Boolean {
            Log.d("alert", message)
            val dialogBuilder = AlertDialog.Builder(this@MainActivity)

            dialogBuilder.setMessage(message)
                .setCancelable(false)
                .setPositiveButton("OK") { _, _ ->
                    result.confirm()
                }

            val alert = dialogBuilder.create()
            alert.show()

            return true
        }

        // For 3.0+ Devices (Start)
        // onActivityResult attached before constructor
        fun openFileChooser(uploadMsg : ValueCallback<Uri>, acceptType:String) {
            mUploadMessage = uploadMsg
            val i = Intent(Intent.ACTION_GET_CONTENT)
            i.addCategory(Intent.CATEGORY_OPENABLE)
            i.type = "*/*"
            startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE)
        }

        // For Lollipop 5.0+ Devices
        override fun onShowFileChooser(mWebView:WebView, filePathCallback:ValueCallback<Array<Uri>>, fileChooserParams:WebChromeClient.FileChooserParams):Boolean {
            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
                if (uploadMessage != null) {
                    uploadMessage?.onReceiveValue(null)
                    uploadMessage = null
                }
                uploadMessage = filePathCallback
                val intent = fileChooserParams.createIntent()
                try {
                    startActivityForResult(intent, REQUEST_SELECT_FILE)
                } catch (e:ActivityNotFoundException) {
                    uploadMessage = null
                    Toast.makeText(getApplicationContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show()
                    return false
                }
                return true
            }else{
                return false
            }
        }

        //For Android 4.1 only
        fun openFileChooser(uploadMsg:ValueCallback<Uri>, acceptType:String, capture:String) {
            mUploadMessage = uploadMsg
            val intent = Intent(Intent.ACTION_GET_CONTENT)
            intent.addCategory(Intent.CATEGORY_OPENABLE)
            intent.type = "*/*"
            startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE)
        }

        fun openFileChooser(uploadMsg:ValueCallback<Uri>) {
            filePermission()
            mUploadMessage = uploadMsg
            val i = Intent(Intent.ACTION_GET_CONTENT)
            i.addCategory(Intent.CATEGORY_OPENABLE)
            i.type = "*/*"
            startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE)
        }
    }

onActivity Result Code -

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
    {
        if(requestCode == REQUEST_SELECT_FILE){
            if(uploadMessage != null){
                uploadMessage?.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode,data))
                uploadMessage = null
            }
        }
    }else if(requestCode == FILECHOOSER_RESULTCODE){
        if(mUploadMessage!=null){
            var result = data?.data
            mUploadMessage?.onReceiveValue(result)
            mUploadMessage = null
        }
    }else{
        Toast.makeText(this,"Failed to open file uploader, please check app permissions.",Toast.LENGTH_LONG).show()
        super.onActivityResult(requestCode, resultCode, data)
    }


}

Answer 2

It's already answered here: File Upload in WebView

You can also use this webview: https://github.com/mgks/Android-SmartWebView