如何通过Intnet发送从base64转换的PDF? [英] How to send PDF converted from base64 through Intnet?
问题描述
我在base64中有一个pdf文件，我对其进行了解码，然后通过Intent发送，但是很遗憾，外部应用程序无法读取它( Evernote ，例如说它可以打开空文件).另一个奇怪的事情是，转换后我在列表中没有像 Adobe Reader 或 Messanger 这样的应用.这是我的代码:
I've got the pdf file in base64, I decoded it, send through the Intent but unfortunately external apps can't read it (Evernote e.g. says that it can't open empty file). Another strange thing is that I have no such apps like Adobe Reader or Messanger in the list after conversion. This is my code:
FileOutputStream fos;
fos = context.openFileOutput("doc.pdf", Context.MODE_PRIVATE);
String fileB64 = url.split(",")[1];
byte[] decodedStr = Base64.decode(fileB64, Base64.NO_WRAP);
fos.write(decodedStr);
Intent sendIntent = new Intent();
sendIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
sendIntent.setAction(Intent.ACTION_SEND);
File filePath = new File(String.valueOf(context.getFilesDir()));
File newFile = new File(filePath, "application/pdf");
sendIntent.putExtra(Intent.EXTRA_STREAM, FileProvider.getUriForFile(context, context.getApplicationContext().getPackageName() + ".FileProvider", newFile));
sendIntent.setType("application/pdf");
context.startActivity(sendIntent);
fos.flush();
fos.close();
我也尝试在线转换器检查转换是否正常.我有这样的东西:
I also try the online converter to check if the conversion went OK. I've got something like this:
%PDF-1.3
3 0 obj
<</Type /Page
/Parent 1 0 R
/Resources 2 0 R
/MediaBox [0 0 348.00 256.00]
/Contents 4 0 R
>>
endobj
4 0 obj
<</Length 11287>>
stream
1.000 0.000 0.000 -1.000 0.000 256.000 cm
0.20 w
0 G
q
1.000 0.000 0.000 1.000 0.000 0.000 cm
q
/F9 16 Tf
/F9 12 Tf
q
q
Q
q
Q
Q
q
Q
q
/GS1 gs
1.000 0.000 0.000 1.000 0.000 0.000 cm
0.000 0.000 m
348.000 0.000 l
348.000 0.000 348.000 0.000 348.000 0.000 c
348.000 256.000 l
348.000 256.000 348.000 256.000 348.000 256.000 c
0.000 256.000 l
为避免诸如这是一张图片，为什么不以图片形式发送"之类的答案?我可以告诉你，这只是我转换的另一种选择.我的转换和将其共享为图像非常有效.感谢您的时间和任何帮助！
To avoid answers like "this is an image, why don't you send it as image" I can tell you that it is just another option for my conversion. My conversion and sharing it as image works perfectly. Thanks for your time and for any help!
@EDIT
我更改了这一行:
File newFile = new File(filePath, "application/pdf");
对此:
File newFile = new File(filePath, "doc.pdf");
I changed this line:
File newFile = new File(filePath, "application/pdf");
to this:
File newFile = new File(filePath, "doc.pdf");
但是现在我得到了pdf的空白页.
But now I got the blank page in pdf.
推荐答案
错误#1:您打开一个文件，然后尝试将其交给另一个应用程序，然后再使用该文件(flush()，丢失的close().
Bug #1: You open a file, then attempt to hand it to another app before completing your work with the file (flush(), the missing getFD().sync(), and close().
错误#2:您正在主应用程序线程上执行磁盘I/O.
Bug #2: You are doing disk I/O on the main application thread.
错误#3:您正尝试将整个解码的PDF读取到堆空间中，这对于许多PDF文件来说都会失败，因为它们太大了.
Bug #3: You are attempting to read the entire decoded PDF into heap space, which will fail for many PDF files, as they will be too large.
错误#4:newFile不会指向您尝试创建的文件，而是指向路径中带有application/pdf的文件.结果，另一个应用程序无法访问您的PDF，即使它已完全写入磁盘.
Bug #4: newFile does not point to the file that you are attempting to create, but rather some file with application/pdf in the path. As a result, the other app has no way to access your PDF, even if it were completely written to disk.
错误#5:您在Intent上没有FLAG_GRANT_READ_URI_PERMISSION，因此第三方应用可能无法读取您的内容(请参见
Bug #5: You do not have FLAG_GRANT_READ_URI_PERMISSION on the Intent, and so the third-party app may not have read access to your content (see the third bullet in the docs).
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