无法附加文件发送电子邮件 android 11

Question

我正在开发一个通过电子邮件发送处理报告的应用程序。当在应用程序中完成处理数据时，用户发送一封包含处理数据的电子邮件。但是，我在 Android 11 上遇到了一个问题。当将报告附加到电子邮件时，无论电子邮件应用程序如何，都会出现一条消息：无法附加文件。我研究了一下，发现这可能与android11版本的设备访问设备内部存储的权限有关。我想帮你发送带有附件的电子邮件android11.

我的代码：清单

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:networkSecurityConfig="@xml/network_security_config"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    android:requestLegacyExternalStorage="true"
    tools:ignore="AllowBackup"
    tools:targetApi="n">

    <activity.....
     <provider
        android:name="androidx.core.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_paths" />
    </provider>
  </application>

我的xml:

<?xml version="1.0" encoding="utf-8"?>
<paths>
   <external-path name="external_files" path="."/>
</paths>

保存文件.pdf

val mDocProc = Document()
            val file =
                File(
                    Environment.getExternalStorageDirectory()
                        .toString() + "/" + "Relatório diário" + date + ".pdf"
                )
            if (file.exists()) {
                file.delete()
            }
            //pdf file path
            mFilePathDaily =
                Environment.getExternalStorageDirectory()
                    .toString() + "/" + "Relatório diário " + date + ".pdf"

Class 发送邮件：

val report = File(mFilePathDaily)
            val uri = FileProvider.getUriForFile(
                activity.requireContext(),
                activity.requireContext().applicationContext.packageName + ".provider",
                report
            )

            val i = Intent(Intent.ACTION_SENDTO)
            i.data = Uri.parse("mailto:")
            i.putExtra(Intent.EXTRA_EMAIL, arrayOf("testesdissertacao@gmail.com"))
            i.putExtra(Intent.EXTRA_SUBJECT, EMAIL_SUBJECT)
            i.putExtra(Intent.EXTRA_TEXT, "Segue em anexo o relatório de Benchmark")
            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
            i.putExtra(Intent.EXTRA_STREAM, uri)
            //i.type = "image/png"
            activity.requireContext().startActivity(Intent.createChooser(i, null))
            progressDialog.dismiss()

现在的问题是您找不到要附加到电子邮件的报告。我注意到报告保存在模拟器的其他文件夹中，而不是根文件夹中。我认为这就是您找不到要附加到电子邮件的文件的原因。

不要将文件附加到电子邮件中

Answer 1

您和电子邮件应用程序将无法访问 Android 上的文件 11. 尝试改用 SAF。 How to use support FileProvider for sharing content to other apps?

Answer 2

我已经在电子邮件中成功附加了图片，我会给你一个代码

将您的 URI 转换为文件

 private void Share(File savepath) {
       
 if (savePath != null) {

            Uri uri = FileProvider.getUriForFile(context, context.getApplicationContext().getPackageName() + ".provider", savePath);

            Intent i = new Intent(Intent.ACTION_SEND);
            i.putExtra(Intent.EXTRA_EMAIL, new String[]{"fake@fake.edu"});
            i.putExtra(Intent.EXTRA_SUBJECT,"On The Job");
            //Log.d("URI@!@#!#!@##!", Uri.fromFile(pic).toString() + "   " + pic.exists());
            i.putExtra(Intent.EXTRA_TEXT,"All Detail of Email are here in message");
            i.putExtra(Intent.EXTRA_STREAM,uri);
            i.setType("image/png");
            context.startActivity(Intent.createChooser(i,"Share you on the jobing"));

        }

如何在 XML 路径中添加提供商首先，您必须创建一个 XML 资源文件夹，然后创建一个 XML 资源文件粘贴此代码后

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="."/>
</paths>

然后还有加载项清单

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="${applicationId}.provider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/provider_paths" />
</provider>

Answer 3

我能够使用下面的代码发送一封带有 pdf 附件的电子邮件。 screenshot Crucial 授予 READ_URI_PERMISSION 和 WRITE_URI_PERMISSION，使用 ACTION_SEND 而不是 ACTION_SENDTO 并且 Uri 链接到标准目录之一中的 pdf 文件，例如作为下载或文档。我不需要将 Uri 转换为文件。:

  //obtaining the uri to the pdf report when creating it
  Uri pathToPdf = null;
  int EmailRequestCode = 200;
  ContentResolver contentresolver = getContentResolver();
  ContentValues contentvalues = new ContentValues();
  contentvalues.put(MediaStore.MediaColumns.DISPLAY_NAME, pdfFileName);
  contentvalues.put(MediaStore.MediaColumns.MIME_TYPE, "application/pdf");
  contentvalues.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_DOWNLOADS + File.separator +"Reports");
  pathToPdf = contentresolver.insert(MediaStore.Files.getContentUri("external"), contentvalues);

  //... writing data to the pdf

  //getting email addresses to include in the email
  String[] mailto = listMailAddressTO.toArray(new String[2]);
  String[] mailCC = listMailAddressCC.toArray(new String[2]);

  Intent emailIntent = new Intent(Intent.ACTION_SEND);
  emailIntent.setType("application/pdf");
  emailIntent.putExtra(Intent.EXTRA_EMAIL, mailto);
  emailIntent.putExtra(Intent.EXTRA_CC, mailCC);
  emailIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
  emailIntent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
  emailIntent.putExtra(Intent.EXTRA_SUBJECT, "UllageReport (Pdf)");                                
  emailIntent.putExtra(Intent.EXTRA_TEXT, "UllageReport");
  emailIntent.putExtra(Intent.EXTRA_STREAM, pathToPdf);
  try{
      if (emailIntent.resolveActivity(getPackageManager()) != null) {
          startActivityForResult(emailIntent, EmailRequestCode);
      }
  }
  catch(android.content.ActivityNotFoundException e){
       Toast.makeText(UllageReportPdf.this, "No email client available", Toast.LENGTH_SHORT).show();
  }

Answer 4

我的解决方案是我必须将 res/xml/file_paths.xml 替换为：

<?xml version="1.0" encoding="utf-8"?>
  <paths>
    <external-path
         name="external"
         path="." />
    <external-files-path
         name="external_files"
         path="." />
    <cache-path
         name="cache"
         path="." />
    <external-cache-path
         name="external_cache"
         path="." />
    <files-path
         name="files"
         path="." />
</paths>

您应该只使用使其工作所需的行。

无法附加文件发送电子邮件 android 11

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