android - PrintedPdfDocument 总是导致损坏的 PDF

Question

我正在尝试根据用户在我的 Android 应用程序中显示的表单创建 PDF 文档。我使用以下代码创建 PDF 文件，然后将其附加到电子邮件中:

public static File generate(View salesFragmentTableLayout, Context context) throws KingdomSpasException {
        Builder printAttrsBuilder = new Builder();
        printAttrsBuilder.setMediaSize(PrintAttributes.MediaSize.ISO_A4);
        printAttrsBuilder.setMinMargins(new Margins(5, 5, 5, 5));

        PrintedPdfDocument document = new PrintedPdfDocument(context, printAttrsBuilder.build());

        PageInfo pageInfo = new PageInfo.Builder(150, 150, 1).create();
        Page page = document.startPage(pageInfo);
        salesFragmentTableLayout.draw(page.getCanvas());
        document.finishPage(page);
        File result = null;
        try {
            result = File.createTempFile("Kingdom Spas Agreement", ".pdf", context.getCacheDir());
            document.writeTo(new BufferedOutputStream(new FileOutputStream(result)));
        } catch (FileNotFoundException e) {
            throw new KingdomSpasException("Failed to find relevent file", e);
        } catch (IOException e) {
            throw new KingdomSpasException("IO Problem occured while creatin the PDF", e);
        }
        document.close();
        return result;
    }

生成的 PDF 总是损坏的，无法通过 Adob​​e Acroread 或 GS​​ 打开。当我在 acroread 中打开它时，出现错误:

There was an error opening this document. The file is damaged and could not be repaired.

当我尝试使用以下命令在 GS 中打开它时:

gs \
   -o repaired.pdf \
   -sDEVICE=pdfwrite \
   -dPDFSETTINGS=/prepress \
  KingdomSpasAgreement.pdf 

我得到以下输出:

**** Error: Cannot find a 'startxref' anywhere in the file.
**** Warning: An error occurred while reading an XREF table.
**** The file has been damaged. This may have been caused
**** by a problem while converting or transfering the file.
**** Ghostscript will attempt to recover the data.
**** Error: Trailer is not found. No pages will be processed (FirstPage > LastPage).

**** This file had errors that were repaired or ignored.
**** Please notify the author of the software that produced this
**** file that it does not conform to Adobe's published PDF
**** specification.

我不明白我可能做错了什么 - 整个过程看起来相当简单，但总是失败。

编辑:

为了完整性，这里是相关的布局:

<TableLayout
            android:id="@+id/salesAgreementTableLayout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TableRow
                android:layout_width="fill_parent"
                android:layout_height="wrap_content" >

                <ImageView
                    android:id="@+id/companyLogo"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:contentDescription="@string/logo_description"
                    android:src="@drawable/company_logo" />

                <ImageView
                    android:id="@+id/companyAddress"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:contentDescription="@string/address_description"
                    android:src="@drawable/company_address" />
            </TableRow>

            <TableRow
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical" >

                <FrameLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" >

                    <EditText
                        android:id="@+id/salesExecInitials"
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:background="@drawable/round"
                        android:inputType="text"
                        android:maxLines="1"
                        android:paddingLeft="130dp"
                        android:singleLine="true" >

                        <requestFocus />
                    </EditText>

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center_vertical"
                        android:paddingLeft="10dp"
                        android:text="@string/sales_exec_initials" />
                </FrameLayout>
            </TableRow>
        </TableLayout>

编辑 #2:文件通过电子邮件发送后，我正在检查它，但现在使用“adb pull”直接检查了它，它仍然以同样的方式损坏。

编辑 #3:我已将损坏的 PDF 示例上传到 dropox:Example of Corrupted PDF

它实际上使用了更简化的 View ，但仍然损坏

编辑# 4:我现在尝试在 getFD() 上调用 sync() 并按照 CommonsWare 下面的建议关闭流，这会导致异常，我觉得这很有趣。堆栈跟踪在这里，以防它揭示任何光:

12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950): com.kingdomspas.android.kingdomspasforms.exceptions.KingdomSpasException: Failed to correctly clean up streams
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at com.kingdomspas.android.kingdomspasforms.utils.KingdomSpasFormsPDFGenerator.generate(KingdomSpasFormsPDFGenerator.java:69)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at com.kingdomspas.android.kingdomspasforms.listeners.KingdomSpasSubmitButtonListener.onClick(KingdomSpasSubmitButtonListener.java:25)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at android.view.View.performClick(View.java:4438)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at android.view.View$PerformClick.run(View.java:18439)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at android.os.Handler.handleCallback(Handler.java:733)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at android.os.Handler.dispatchMessage(Handler.java:95)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at android.os.Looper.loop(Looper.java:136)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at android.app.ActivityThread.main(ActivityThread.java:5147)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at java.lang.reflect.Method.invokeNative(Native Method)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at java.lang.reflect.Method.invoke(Method.java:515)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at dalvik.system.NativeStart.main(Native Method)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950): Caused by: java.io.IOException: write failed: EBADF (Bad file number)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.IoBridge.write(IoBridge.java:455)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at java.io.FileOutputStream.write(FileOutputStream.java:187)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at java.io.BufferedOutputStream.flushInternal(BufferedOutputStream.java:185)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:85)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at com.kingdomspas.android.kingdomspasforms.utils.KingdomSpasFormsPDFGenerator.generate(KingdomSpasFormsPDFGenerator.java:63)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   ... 12 more
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950): Caused by: libcore.io.ErrnoException: write failed: EBADF (Bad file number)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.Posix.writeBytes(Native Method)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.Posix.write(Posix.java:202)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.BlockGuardOs.write(BlockGuardOs.java:197)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.IoBridge.write(IoBridge.java:450)
12-16 16:39:05.675: E/KingdomSpasSubmitButtonListener(17950):   ... 16 more
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950): Failed to generate the agreement PDF
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950): com.kingdomspas.android.kingdomspasforms.exceptions.KingdomSpasException: Failed to correctly clean up streams
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at com.kingdomspas.android.kingdomspasforms.utils.KingdomSpasFormsPDFGenerator.generate(KingdomSpasFormsPDFGenerator.java:69)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at com.kingdomspas.android.kingdomspasforms.listeners.KingdomSpasSubmitButtonListener.onClick(KingdomSpasSubmitButtonListener.java:25)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at android.view.View.performClick(View.java:4438)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at android.view.View$PerformClick.run(View.java:18439)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at android.os.Handler.handleCallback(Handler.java:733)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at android.os.Handler.dispatchMessage(Handler.java:95)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at android.os.Looper.loop(Looper.java:136)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at android.app.ActivityThread.main(ActivityThread.java:5147)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at java.lang.reflect.Method.invokeNative(Native Method)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at java.lang.reflect.Method.invoke(Method.java:515)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at dalvik.system.NativeStart.main(Native Method)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950): Caused by: java.io.IOException: write failed: EBADF (Bad file number)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.IoBridge.write(IoBridge.java:455)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at java.io.FileOutputStream.write(FileOutputStream.java:187)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at java.io.BufferedOutputStream.flushInternal(BufferedOutputStream.java:185)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:85)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at com.kingdomspas.android.kingdomspasforms.utils.KingdomSpasFormsPDFGenerator.generate(KingdomSpasFormsPDFGenerator.java:63)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   ... 12 more
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950): Caused by: libcore.io.ErrnoException: write failed: EBADF (Bad file number)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.Posix.writeBytes(Native Method)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.Posix.write(Posix.java:202)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.BlockGuardOs.write(BlockGuardOs.java:197)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   at libcore.io.IoBridge.write(IoBridge.java:450)
12-16 16:39:13.845: E/KingdomSpasSubmitButtonListener(17950):   ... 16 more

Answer 1

您永远不会flush() 或close() 您的流。您还应该在 FileOutputStream 上调用 getFD() 上的 sync() 以确保所有字节都提交到磁盘(而不是写入 -由文件系统缓存)。根据您尝试对文件执行某些操作的时间，此类操作可能会导致输出被截断。