像这样更改代码。

发件人

File file = new File(Environment.getExternalStorageDirectory(), "Email-Ghap/Emails.txt");

到

File file = new File(Environment.getExternalStorageDirectory() + "/" + "Email-Ghap/Emails.txt");

来自：

sharingIntent.setType("*/txt");

到

sharingIntent.setType("text/*");

所以您的最终代码看起来像

so yourFinal Code Looks Like

    File file = new File(Environment.getExternalStorageDirectory().toString() + "/" + "abc.txt");
            Intent sharingIntent = new Intent(Intent.ACTION_SEND);
            sharingIntent.setType("text/*");
            sharingIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://" + file.getAbsolutePath()));
            startActivity(Intent.createChooser(sharingIntent, "share file with"));