Webview call action, zoom option and download option in android studio

WebView call action:

 webView.setWebViewClient(new WebViewClient(){

    @Override
    public boolean shouldOverrideUrlLoading(WebView wView, String url)
    {

        if (url.startsWith("mailto:") || url.startsWith("tel:") || url.startsWith("geo:"))  {

            Intent intent = new Intent(Intent.ACTION_VIEW,
                    Uri.parse(url));

            startActivity(intent);

            return true;

        } else if (url.startsWith("whatsapp:")) {

            Intent sendIntent = new Intent();
            sendIntent.setAction(Intent.ACTION_SEND);
            sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
            sendIntent.setType("text/plain");
            sendIntent.setPackage("com.whatsapp");

            startActivity(sendIntent);

            return true;

        }

        return false;
    }
});

Webview zoom option:

webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
webView.getSettings().setDomStorageEnabled(true);
webView.getSettings().setLayoutAlgorithm(webView.getSettings().getLayoutAlgorithm());
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setEnableSmoothTransition(true);

Enable download option in webview:

Java:

webView.setDownloadListener(new DownloadListener() {
    @Override
    public void onDownloadStart(final String url, final String userAgent, String contentDisposition, String mimetype, long contentLength) {
        //Checking runtime permission for devices above Marshmallow.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                    == PackageManager.PERMISSION_GRANTED) {
                Log.v("WebBrowser", "Permission is granted");
                downloadDialog(url, userAgent, contentDisposition, mimetype);

            } else {

                Log.v("WebBrowser", "Permission is revoked");
                //requesting permissions.
                ActivityCompat.requestPermissions(Web_browser.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);

            }
        } else {
            //Code for devices below API 23 or Marshmallow
            Log.v("WebBrowser", "Permission is granted");
            downloadDialog(url, userAgent, contentDisposition, mimetype);

        }
    }
});

add more:


        String[] permissionsStorage = {Manifest.permission.READ_EXTERNAL_STORAGE};
        int requestExternalStorage = 1;
        int permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);
        if (permission != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, permissionsStorage, requestExternalStorage);
        }
        
        if(!isNetworkAvailable(Web_browser.this)){
            webView.setVisibility(View.GONE);
            layNonet.setVisibility(View.VISIBLE);
        }else{
            webView.setVisibility(View.VISIBLE);
            layNonet.setVisibility(View.GONE);
        }

Manifest: 

   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="ANDROID.PERMISSION.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />