Android Webview Fileupload Açılmıyor ?

Merhaablar arkadaşlar. Bir web sitem var webview ile uygulama haline getirdim. Ama Şöyle bir sorunum web sitemde fileupload ile resim yükleme olayı var. Uygulama içinde fileupload tıklayınca açılmıyor. Nette baya bir araştırma yaptım bir çözüme ulaşamadım. Önerisi olan veya yardımcı olmak isteyen arkadaşlar var mı? Şimdiden teşekkür ederim.
iyi geceler.

Aynı dertten müzdaripim, takipteyim

import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
    private WebView webView;
    private SwipeRefreshLayout refreshLayout;
    private ValueCallback<Uri> mUploadMessage;
    public ValueCallback<Uri[]> uploadMessage;
    public static final int REQUEST_SELECT_FILE = 100;
    private final static int FILECHOOSER_RESULTCODE = 1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        webView = (WebView) findViewById(R.id.webview1);
//        webView.getSettings().setJavaScriptEnabled(true);
//        webView.setWebViewClient(new MyBrowser());
//        webView.loadUrl("http://bagicode.com");
        WebSettings mWebSettings = webView.getSettings();
        mWebSettings.setJavaScriptEnabled(true);
        mWebSettings.setSupportZoom(false);
        mWebSettings.setAllowFileAccess(true);
        mWebSettings.setAllowFileAccess(true);

        webView.setWebViewClient(new MyBrowser());
        webView.loadUrl("seninsiten");

        webView.setWebChromeClient(new WebChromeClient() {
            // For 3.0+ Devices (Start)
            // onActivityResult attached before constructor
            protected void openFileChooser(ValueCallback uploadMsg, String acceptType)
            {
                mUploadMessage = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");
                startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE);
            }

            // For Lollipop 5.0+ Devices
            @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
            public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams)
            {
                if (uploadMessage != null) {
                    uploadMessage.onReceiveValue(null);
                    uploadMessage = null;
                }
                uploadMessage = filePathCallback;
                Intent intent = fileChooserParams.createIntent();
                try
                {
                    startActivityForResult(intent, REQUEST_SELECT_FILE);
                } catch (ActivityNotFoundException e)
                {
                    uploadMessage = null;
                    Toast.makeText(MainActivity.this.getApplicationContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show();
                    return false;
                }
                return true;
            }
            //For Android 4.1 only
            protected void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture)
            {
                mUploadMessage = uploadMsg;
                Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
                intent.addCategory(Intent.CATEGORY_OPENABLE);
                intent.setType("image/*");
                startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);
            }
            protected void openFileChooser(ValueCallback<Uri> uploadMsg)
            {
                mUploadMessage = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");
                startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
            }
        });
    }
    @Override
    public void onRefresh() {
        webView.reload();
        refreshLayout.setRefreshing(false);
    }
    private class MyBrowser extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }
        @Override
        public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
            view.loadData("Maaf Internet Anda tidak stabil", "text/html", "utf-8");
            super.onReceivedError(view, request, error);
        }
//        @Override
//        public void onReceivedHttpError(WebView view, WebResourceRequest request, WebResourceResponse errorResponse) {
//            view.loadData("Maaf Internet Anda tidak stabil", "text/html", "utf-8");
//            super.onReceivedHttpError(view, request, errorResponse);
//        }
    }
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()){
            webView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent)
    {
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
        {
            if (requestCode == REQUEST_SELECT_FILE)
            {
                if (uploadMessage == null)
                    return;
                uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent));
                uploadMessage = null;
            }
        }
        else if (requestCode == FILECHOOSER_RESULTCODE)
        {
            if (null == mUploadMessage)
                return;
            // Use MainActivity.RESULT_OK if you're implementing WebView inside Fragment
            // Use RESULT_OK only if you're implementing WebView inside an Activity
            Uri result = intent == null || resultCode != MainActivity.RESULT_OK ? null : intent.getData();
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;
        }
        else
            Toast.makeText(MainActivity.this.getApplicationContext(), "Failed to Upload Image", Toast.LENGTH_LONG).show();
    }
}

Sanırım Ben yaptım. Yukarıdaki kodu kendine göre düzenle çalışacaktır.

Teşekkürler hocam, deneyeceğim