带有PDF加载的Android webview

Question

I am loading a page inside the webview

webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("https://www.xxxxxxxxx/howtoguide.aspx");

then inside the webview I have several function to click event below

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

            if (url.contains("concierge@xxxx.com.sg")) {
                final Intent eIntent = new Intent(
                        android.content.Intent.ACTION_SEND);
                eIntent.setType("plain/text");
                eIntent.putExtra(android.content.Intent.EXTRA_EMAIL,
                        new String[]{"xxxxxx"});
                eIntent.putExtra(android.content.Intent.EXTRA_SUBJECT,
                        "");
                eIntent.putExtra(android.content.Intent.EXTRA_TEXT,
                        "Text to be send");
                startActivity(Intent.createChooser(eIntent,
                        "Send mail..."));

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

            Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
                startActivity(intent);
                view.reload();

            } else if (url.contains(".pdf")) {
            //Intent intent = new Intent(Intent.ACTION_VIEW);
            //intent.setDataAndType(Uri.parse(url), "application/pdf");
            //try{
            //view.getContext().startActivity(intent);
            //} catch (ActivityNotFoundException e) {
            //user does not have a pdf viewer installed
            //}
            // view.loadUrl("https://docs.google.com/viewer?url=" + url);
               view.loadUrl("http://drive.google.com/viewerng/viewer?embedded=true&url=" + url);               
            } else {
                view.loadUrl(url);
            }
            return true;
        }

in this webview there is a click event for PDF. So if I click this the PDF not loading

Answer 1

Please check the below example code for your requirement

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

    MyWebViewClient webViewClient = new MyWebViewClient(this, webview);
    webViewClient.loadUrl(YOUR_URL);
}

private class MyWebViewClient extends WebViewClient
{
    private static final String TAG = "MyWebViewClient";
    private static final String PDF_EXTENSION = ".pdf";
    private static final String PDF_VIEWER_URL = "https://drive.google.com/viewerng/viewer?embedded=true&url=";

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

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

    public void loadUrl(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 (url.contains("concierge@xxxx.com.sg"))
        {
            Intent eIntent = new Intent(android.content.Intent.ACTION_SEND);
            eIntent.setType("plain/text");
            eIntent.putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{"xxxxxx"});
            eIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "");
            eIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Text to be send");
            startActivity(Intent.createChooser(eIntent, "Send mail..."));
            return true;
        }
        else if (url.startsWith("tel:"))
        {
            Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
            startActivity(intent);
            return true;
        }
        else if (!isLoadingPdfUrl && isPdfUrl(url))
        {
            mWebView.stopLoading();

            final String pdfUrl = PDF_VIEWER_URL + url;

            new Handler().postDelayed(new Runnable()
            {
                @Override
                public void run()
                {
                    loadUrl(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;
    }
}

Checkout the example code for handling redirect urls and open PDF without download, in webview. https://gist.github.com/ashishdas09/014a408f9f37504eb2608d98abf49500

Answer 2

view.loadUrl("http://drive.google.com/viewerng/viewer?embedded=true&url=" + url);

This method call working for me, when I called to load inside the webview. So this webview layout height should be match_parent.

Link click open the browser then simply pass the URL like below code.

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

This is solved my problem.

Answer 3

That the use of these methods need to log in to Google.

Other way use pdf.js

You must save pdf file into sdcard and load in webview.

Add the pdfjs files to your Assets directory

 else if (url.contains(".pdf"))
        {
           File file = new File(Environment.getExternalStorageDirectory() + "/test.pdf");

   view.loadUrl("file:///android_asset/pdfjs/web/viewer.html?file=" + file.getAbsolutePath() + "#zoom=page-width"); 
        }

Full sample project