Question

我正在使用webView.createPrintDocumentAdapter（jobname）使用名为PDFPrint的自定义类来打印PDF。这里是以下类的摘录：

function onMessage(event) {
  var name = "";

  if (event.message.text == "Im Bored") {
    name = "You";
  } else {
    name = event.user.displayName;
  }
  var message = name + ": You could scrub accounts or make some calls.  Have you logged into statflo today? ";

  return { "text": message };
}

我的Activity通过以下方法使用此类：

public PdfPrint(PrintAttributes p_atributos, aperturador_archivos mi_aperturador )
{
    atributos = p_atributos;
    aperturador = mi_aperturador;
}

public void print(final PrintDocumentAdapter printAdapter, final File path, final String filename)
{
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        printAdapter.onLayout(null, atributos, null, new PrintDocumentAdapter.LayoutResultCallback() {
            @Override
            public void onLayoutFinished(PrintDocumentInfo info, boolean changed) {
                printAdapter.onWrite(new PageRange[]{PageRange.ALL_PAGES},getOutputFile(path,filename),new CancellationSignal(), new PrintDocumentAdapter.WriteResultCallback() {
                    @Override
                    public void onWriteFinished(PageRange[] pages) {
                        super.onWriteFinished(pages);
                    }
                });
            }
        },null);


    }
}

    private ParcelFileDescriptor getOutputFile(File path, String fileName) {
        if (!path.exists()) {
            path.mkdirs();
        }
        File file = new File(path, fileName);
        try {
            file.createNewFile();
            return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_WRITE);
        } catch (Exception e) {
            Log.e(TAG, "Failed to open ParcelFileDescriptor", e);
        }
        return null;
    }

代码在生成PDF文件时按预期工作。但是我想在生成文件后打开它，但是我找不到正确的方法，我尝试覆盖某些方法，但是得到了一个没有内容的空pdf文件。

我想知道如何实现该功能，这里是打开文件的代码：

private void createWebPrintJob(WebView webView) {
        String jobName = getString(R.string.app_name) + " Document";
        PrintAttributes attributes = new PrintAttributes.Builder()
                .setMediaSize(PrintAttributes.MediaSize.ISO_A4)
                .setResolution(new PrintAttributes.Resolution("pdf", "pdf", 600, 600))
                .setMinMargins(PrintAttributes.Margins.NO_MARGINS).build();
        File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS + "/PDFHYC/");
        PdfPrint pdfPrint = new PdfPrint(attributes, this);
        String[] titulo_split = mToolbar.getTitle().toString().split(" ");
        pdfPrint.print(webView.createPrintDocumentAdapter(jobName) , path, titulo_split[0]+ "_"+  titulo_split[1]+ "_" + Long.toString(System.currentTimeMillis()).substring(1,6)+ ".pdf");
    }

Answer 1

我的实现基于this answer：

 Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(
              FileProvider.getUriForFile(
                        MainActivity.this,
                        getApplicationContext().getPackageName() + ".provider",
                        pdfFile),
                "application/pdf");
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
        Intent chooserIntent =
                Intent.createChooser(intent, getResources().getString(R.string.open_with));

        try {
            startActivity(chooserIntent);
        } catch (ActivityNotFoundException e) {
            showError(R.string.error_missed_pdf_reader);
        }

创建PDF后打开文件

1 个答案: