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我想发送一封附有 pdf 文件的电子邮件。当我尝试通过 URI 发送它们时，我收到以下错误消息：

android.os.FileUriExposedException: file:///Download/myPDFFile.pdf exposed beyond app through ClipData.Item.getUri()

所以我尝试对文件提供者做同样的事情。在这里，我收到此错误消息：

java.lang.IllegalArgumentException: Couldn't find meta-data for provider with authority com.example.digitalpaper.provider

                String filename="myPDFFile.pdf";

                File testFile = new File(Environment.DIRECTORY_DOWNLOADS, filename);

                Uri path =    FileProvider.getUriForFile(Objects.requireNonNull(getApplicationContext()),BuildConfig.APPLICATION_ID + ".provider", testFile);


               //----------------Sending the Mail----------------//
                Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
                emailIntent.setType("application/pdf");
                String to[] = {"xyz@gmx.de",eT_email.getText().toString()};
                emailIntent.putExtra(Intent.EXTRA_EMAIL, to);

                emailIntent.putExtra(Intent.EXTRA_SUBJECT,"Subject");


//-----------------------Attaching the file---------------------------------//

                emailIntent.putExtra(Intent.EXTRA_STREAM, path);
              //  emailIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse( "file://"+filelocation));

                startActivity(Intent.createChooser(emailIntent,"Send email..."));

我已经尝试了几种方法来完成该电子邮件附件，但我永远无法访问我的外部存储。有人知道如何解决吗？

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