Webview in marshmellow screen goes black

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Android

marshmallow

i have develop application in asp.net net and make web app of my responsive website. my app is working fine on kitkat, Lollipop but not work on Marshmallow.
when i press shortcut icon on my app screen goes black. no activity happen only on Marshmallow. on other android devices it work fine.

What I have tried:

public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

            if (requestCode != INPUT_FILE_REQUEST_CODE || mFilePathCallback == null) {
                super.onActivityResult(requestCode, resultCode, data);
                return;
            }

            Uri[] results = null;

            // Check that the response is a good one
            if (resultCode == Activity.RESULT_OK) {
                if (data == null) {
                    // If there is not data, then we may have taken a photo
                    if (mCameraPhotoPath != null) {
                        results = new Uri[]{Uri.parse(mCameraPhotoPath)};
                    }
                } else {
                    String dataString = data.getDataString();
                    if (dataString != null) {
                        results = new Uri[]{Uri.parse(dataString)};
                    }
                }
            }

            mFilePathCallback.onReceiveValue(results);
            mFilePathCallback = null;

        } else if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
            if (requestCode != FILECHOOSER_RESULTCODE || mUploadMessage == null) {
                super.onActivityResult(requestCode, resultCode, data);
                return;
            }

            if (requestCode == FILECHOOSER_RESULTCODE) {

                if (null == this.mUploadMessage) {
                    return;

                }

                Uri result = null;

                try {
                    if (resultCode != RESULT_OK) {

                        result = null;

                    } else {

                        // retrieve from the private variable if the intent is null
                        result = data == null ? mCapturedImageURI : data.getData();
                    }
                } catch (Exception e) {
                    Toast.makeText(getApplicationContext(), "activity :" + e,
                            Toast.LENGTH_LONG).show();
                }

                mUploadMessage.onReceiveValue(result);
                mUploadMessage = null;

            }
        }

        return;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        webView = (WebView) findViewById(R.id.webView);

        webView.setBackgroundColor(Color.TRANSPARENT);

//        webView.setBackgroundResource(R.drawable.background);

        webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setLoadWithOverviewMode(true);
        webSettings.setAllowFileAccess(true);

        webView.setWebViewClient(new PQClient());
        webView.setWebChromeClient(new PQChromeClient());
        //if SDK version is greater of 19 then activate hardware acceleration otherwise activate software acceleration
        if (Build.VERSION.SDK_INT >= 19) {
            webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
        }
        else if(Build.VERSION.SDK_INT >=11 && Build.VERSION.SDK_INT < 19) {
            webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }

        //webView.loadUrl("file:///android_asset/index.html");
        webView.loadUrl("http://www.superration.com/");
    }