Hemant Vishwakarma: Saving PDF from webview print function always produce a 0 size invalid PDF file

Thursday, 18 November 2021

Saving PDF from webview print function always produce a 0 size invalid PDF file

I have to following sample code which creates a print preview from WebView.

public class PrintLauncherFragmentActivity extends AppCompatActivity {
    private WebView mWebView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // https://developer.android.com/training/printing/html-docs

        // Create a WebView object specifically for printing
        WebView webView = new WebView(this);
        webView.setWebViewClient(new WebViewClient() {

            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                return false;
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                createWebPrintJob(view);
                mWebView = null;
            }
        });

        String htmlDocument = "<html><body><h1>Test Content</h1><p>Testing, " +
                "testing, testing...</p></body></html>";

        webView.loadDataWithBaseURL(null, htmlDocument, "text/HTML", "UTF-8", null);

        // Keep a reference to WebView object until you pass the PrintDocumentAdapter
        // to the PrintManager
        mWebView = webView;
    }

    private void createWebPrintJob(WebView webView) {

        // Get a PrintManager instance
        PrintManager printManager = (PrintManager) this
                .getSystemService(Context.PRINT_SERVICE);

        String jobName = "demo";

        // Get a print adapter instance
        PrintDocumentAdapter printAdapter = webView.createPrintDocumentAdapter(jobName);

        // Create a print job with name and adapter instance
        PrintJob printJob = printManager.print(jobName, printAdapter,
                new PrintAttributes.Builder().build());

        // Save the job object for later status checking
        //printJobs.add(printJob);
    }

}

Things look good on print preview page