Android - Example for handling redirect urls and open PDF without download, in webview.

Android - Example for handling redirect urls and open PDF without download in webview.txt

private void init()
{
	WebView webview = (WebView) findViewById(R.id.webview);
	WebSettings settings = webview.getSettings();
	settings.setJavaScriptEnabled(true);
	webview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);

	PdfWebViewClient pdfWebViewClient = new PdfWebViewClient(this, webview);
	pdfWebViewClient.loadPdfUrl(
				"https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwjgwIfp3KXSAhXrhFQKHQqEDHYQFggZMAA&url=http%3A%2F%2Fwww.orimi.com%2Fpdf-test.pdf&usg=AFQjCNERYYcSfMLS5ukBcT2Qy11YxEhXqw&cad=rja");
}

private class PdfWebViewClient extends WebViewClient
{
	private static final String TAG = "PdfWebViewClient";
	private static final String PDF_EXTENSION = ".pdf";
	private static final String PDF_VIEWER_URL = "http://docs.google.com/gview?embedded=true&url=";

	private Context mContext;
	private WebView mWebView;
	private ProgressDialog mProgressDialog;
	private boolean isLoadingPdfUrl;

	public PdfWebViewClient(Context context, WebView webView)
	{
		mContext = context;
		mWebView = webView;
		mWebView.setWebViewClient(this);
	}

	public void loadPdfUrl(String url)
	{
		mWebView.stopLoading();

		if (!TextUtils.isEmpty(url))
		{
			isLoadingPdfUrl = isPdfUrl(url);
			if (isLoadingPdfUrl)
			{
				mWebView.clearHistory();
			}

			showProgressDialog();
		}

		mWebView.loadUrl(url);
	}

	@SuppressWarnings("deprecation")
	@Override
	public boolean shouldOverrideUrlLoading(WebView webView, String url)
	{
		return shouldOverrideUrlLoading(url);
	}

	@SuppressWarnings("deprecation")
	@Override
	public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl)
	{
		handleError(errorCode, description.toString(), failingUrl);
	}

	@TargetApi(Build.VERSION_CODES.N)
	@Override
	public boolean shouldOverrideUrlLoading(WebView webView, WebResourceRequest request)
	{
		final Uri uri = request.getUrl();
		return shouldOverrideUrlLoading(webView, uri.toString());
	}

	@TargetApi(Build.VERSION_CODES.N)
	@Override
	public void onReceivedError(final WebView webView, final WebResourceRequest request, final WebResourceError error)
	{
		final Uri uri = request.getUrl();
		handleError(error.getErrorCode(), error.getDescription().toString(), uri.toString());
	}

	@Override
	public void onPageFinished(final WebView view, final String url)
	{
		Log.i(TAG, "Finished loading. URL : " + url);
		dismissProgressDialog();
	}

	private boolean shouldOverrideUrlLoading(final String url)
	{
		Log.i(TAG, "shouldOverrideUrlLoading() URL : " + url);

		if (!isLoadingPdfUrl && isPdfUrl(url))
		{
			mWebView.stopLoading();

			final String pdfUrl = PDF_VIEWER_URL + url;

			new Handler().postDelayed(new Runnable()
			{
				@Override
				public void run()
				{
					loadPdfUrl(pdfUrl);
				}
			}, 300);

			return true;
		}

		return false; // Load url in the webView itself
	}

	private void handleError(final int errorCode, final String description, final String failingUrl)
	{
		Log.e(TAG, "Error : " + errorCode + ", " + description + " URL : " + failingUrl);
	}

	private void showProgressDialog()
	{
		dismissProgressDialog();
		mProgressDialog = ProgressDialog.show(mContext, "", "Loading...");
	}

	private void dismissProgressDialog()
	{
		if (mProgressDialog != null && mProgressDialog.isShowing())
		{
			mProgressDialog.dismiss();
			mProgressDialog = null;
		}
	}

	private boolean isPdfUrl(String url)
	{
		if (!TextUtils.isEmpty(url))
		{
			url = url.trim();
			int lastIndex = url.toLowerCase().lastIndexOf(PDF_EXTENSION);
			if (lastIndex != -1)
			{
				return url.substring(lastIndex).equalsIgnoreCase(PDF_EXTENSION);
			}
		}
		return false;
	}
}