从片段打印 Textviews 和 webview答案

【问题标题】：Print Textviews and webview from fragment从片段打印 Textviews 和 webview
【发布时间】：2022-08-09 03:52:58
【问题描述】：

我正在使用这样的代码从 webview 创建 pdf

PrintManager printManager = (PrintManager) this
                .getSystemService(Context.PRINT_SERVICE); 
PrintDocumentAdapter printAdapter = webView.createPrintDocumentAdapter(\"PDF\");
printManager.print(\"PDF\", printAdapter,
                new PrintAttributes.Builder().build());

我应该怎么做，添加到这个 pdf 创建一些 TextView 因为我需要向我的片段添加额外的字段？

了解itextg，但我需要一些免费的东西。

标签： android pdf printing webview textview

【解决方案1】：

选择一个选项以在 webview 中将字段实现为 html

【讨论】：

【解决方案2】：

您可以从 webview 中获取位图，然后使用位图画布在位图上绘制 textview。

从那里，您可以将位图转换为 pdf 并共享 pdf。

以下是将 webview 转换为位图的代码，并将位图转换为 pdf 然后共享它，要求用户选择其打印机应用程序：

public static void sharePdfFile(WebView webView, Context context)
{
    Bitmap bitmap = webviewToBitmap( webView );
    PrintedPdfDocument pdf =  bitmapToPdf( bitmap, context );
    File file = pdfToFile( pdf, context );
    shareFile( file,"application/pdf", context );
}

private static void shareFile(File file, String contentType, Context context)
{
    Uri uri = FileProvider.getUriForFile(
        context,
        context.getPackageName() + ".fileprovider",
        file);
    Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND);
    shareIntent.setType(contentType);
    shareIntent.putExtra(Intent.EXTRA_STREAM, uri);
    shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    Toast.makeText(
        context,
        "Choose your printer app",
        Toast.LENGTH_LONG
    ).show();
    context.startActivity( shareIntent );
}

private static File pdfToFile(PrintedPdfDocument printedPdfDocument, Context context)
{
    File file = new File(context.getFilesDir(), "share.pdf");
    try {
        FileOutputStream outputStream = new FileOutputStream(file);
        printedPdfDocument.writeTo(outputStream);
        outputStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    printedPdfDocument.close();
    return file;
}


private static PrintedPdfDocument bitmapToPdf(Bitmap bitmap, Context context)
{
    PrintAttributes printAttributes = new PrintAttributes.Builder()
        .setColorMode(PrintAttributes.COLOR_MODE_COLOR)
        .setMediaSize(PrintAttributes.MediaSize.ISO_A4)
        .setMinMargins(PrintAttributes.Margins.NO_MARGINS)
        .setResolution(new PrintAttributes.Resolution("1", "label", 300, 300))
        .build();
    PrintedPdfDocument printedPdfDocument = new PrintedPdfDocument(context, printAttributes);
    PdfDocument.Page pdfDocumentPage = printedPdfDocument.startPage(1);
    Canvas pdfCanvas = pdfDocumentPage.getCanvas();
    bitmap = scaleBitmapToHeight(bitmap, pdfCanvas.getHeight());
    pdfCanvas.drawBitmap(bitmap, 0f, 0f, null);
    printedPdfDocument.finishPage(pdfDocumentPage);
    return printedPdfDocument;
}

private static Bitmap webviewToBitmap(WebView webView) {
    webView.measure(
        View.MeasureSpec.makeMeasureSpec(
            0,
            View.MeasureSpec.UNSPECIFIED
        ),
        View.MeasureSpec.makeMeasureSpec(
            0,
            View.MeasureSpec.UNSPECIFIED
        )
    );
    int webViewWidth = webView.getMeasuredWidth();
    int webViewHeight = webView.getMeasuredHeight();
    webView.layout(0,0, webViewWidth, webViewHeight );
    Bitmap bitmap = Bitmap.createBitmap(webViewWidth, webViewHeight, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    canvas.drawBitmap(bitmap, 0, bitmap.getHeight(), new Paint());
    webView.draw(canvas);
    return bitmap;
}

private static Bitmap scaleBitmapToHeight(Bitmap bitmap, int maxHeight) {
    int height = bitmap.getHeight();
    if(height > maxHeight) {
        int width = bitmap.getWidth();
        float scalePercentage = ((float)maxHeight) / height;
        return Bitmap.createScaledBitmap(bitmap, (int) (width * scalePercentage), maxHeight, false);
    }
    return bitmap;
}

【讨论】：