WebView

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

<WebView

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   android:id="@+id/web"/>

WebView web;

   @Override

   protected void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_main);

web = findViewById(R.id.web);

       web.getSettings().setLoadsImagesAutomatically(true);

       web.getSettings().setJavaScriptEnabled(true);

       web.getSettings().setAppCacheEnabled(true);

       web.getSettings().setAllowFileAccess(true);

       web.getSettings().setLoadWithOverviewMode(true);

       web.getSettings().setUseWideViewPort(true);

       web.getSettings().setDomStorageEnabled(true);

       web.setWebViewClient(new WebViewClient());

       web.getSettings().setBuiltInZoomControls(true);

       web.loadUrl("https://www.pexels.com/");

       if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.M){

           if(checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED){

               Log.d("permission","permission denied to WRITE_EXTERNAL_STORAGE - requesting it");

               String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};

               requestPermissions(permissions,1);

           }

       }

//handle downloading

       web.setDownloadListener(new DownloadListener() {

           @Override

           public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimeType, long contentLength) {

               DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));

               request.setMimeType(mimeType);

               String cookies = CookieManager.getInstance().getCookie(url);

               request.addRequestHeader("cookie",cookies);

               request.addRequestHeader("User-Agent",userAgent);

               request.setDescription("Downloading file....");

               request.setTitle(URLUtil.guessFileName(url,contentDisposition,mimeType));

               request.allowScanningByMediaScanner();

               request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

               request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(url, contentDisposition, mimeType));

               DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

               dm.enqueue(request);

               Toast.makeText(getApplicationContext(),"Downloading File",Toast.LENGTH_SHORT).show();

           }

       });

}

   @Override

   public void onBackPressed() {

       if (web.canGoBack()){

           web.goBack();

       }

       else {

           super.onBackPressed();

       }

   }

}