错误：无法使用文件提供程序在 GMAIL 应用程序中附加空文件

Question

我正在尝试在 gmail 应用程序中附加 pdf 文件。我已阅读this 和this（应用解决方案）我正在尝试；

public static void attachFile(Context ctx) {
    String TAG = "Attach";
    File documentsPath = new File(ctx.getFilesDir(), "documents");
    Log.i(TAG,"documentsAbsolutePath Output");
    Log.i(TAG, documentsPath.getAbsolutePath().toString());
    File file = new File(documentsPath, "sample.pdf");
    if ( file.exists() ) {
        Toast.makeText(ctx, "Exits", Toast.LENGTH_LONG).show();
    }else{
        Toast.makeText(ctx, "Not Exist", Toast.LENGTH_LONG).show();
    }
    Log.i(TAG,"file Output");
    Log.i(TAG, file.toString());
    Log.i(TAG, String.valueOf(file.length()));
    Uri uri = FileProvider.getUriForFile(ctx, "com.example.fyp_awais.attachfiletest2.fileprovider", file);
    Log.i(TAG,"URI Output");
    Log.i(TAG,uri.toString());
    Intent intent = ShareCompat.IntentBuilder.from((Activity) ctx)
            .setType("application/pdf")
            .setStream(uri)
            .setChooserTitle("Choose bar")
            .createChooserIntent()
            .addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    ctx.startActivity(intent);
}

输出

documentsAbsolutePath Output
/data/data/com.example.fyp_awais.attachfiletest2/files/documents
 file Output
/data/data/com.example.fyp_awais.attachfiletest2/files/documents/sample.pdf
 0
 URI Output
 content://com.example.fyp_awais.attachfiletest2.fileprovider/pdf_folder/sample.pdf

菜单

<provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="com.example.fyp_awais.attachfiletest2.fileprovider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/filepath" />
</provider>

文件路径.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <paths xmlns:android="http://schemas.android.com/apk/res/android">
        <files-path name="pdf_folder" path="documents/"/>
    </paths>
</PreferenceScreen

一个pdf文件保存在Galaxy Core Prime\Phone\documents中。 （文件大小：53.7KB）

但它给了

无法附加空文件。

我对@9​​87654333@ 这一行中的文件夹名称感到困惑。该文件位于\Phone\documents 中。那么为什么是文件夹名称？

编辑 1

尝试将setType(application/pdf) 替换为setType("message/rfc822")，但没有成功。有什么帮助吗？

Answer 1

以 URI 格式发送文件，如下所示：

Intent emailIntent = new Intent(Intent.ACTION_SEND_MULTIPLE);
        emailIntent.setData(Uri.parse("mailto:"));
        emailIntent.setType("application/image");
        emailIntent.putExtra(Intent.EXTRA_EMAIL, TO);
        emailIntent.putExtra(Intent.EXTRA_CC, CC);
ArrayList<Uri> uris = new ArrayList<>();
        //convert from paths to Android friendly Parcelable Uri's
        uris.add(frontImageUri);
        uris.add(backImageUri);
        emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
startActivity(Intent.createChooser(emailIntent, "Send mail..."));

Answer 2

如果可以发邮编就试试这种方式

 String fileNameStor_zip = Environment.getExternalStorageDirectory() + "/" + fileName + ".zip";

String[] path = { your 1st pdf  File Path, your 2nd pdf  File Path};

Compress compress = new Compress(path, fileNameStor_zip);

compress.zip();


URI =  Uri.parse("file://" + fileNameStor_zip);

提供您的 Gmail Intent

intent.putExtra(Intent.EXTRA_STREAM, URI);

Answer 3

Uri contentUri = FileProvider.getUriForFile(this, "com.mydomain.fileprovider", newFile);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
i.setData(contentUri);

Answer 4

String filename="my_file.vcf"; 
File filelocation = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), filename);
Uri path = Uri.fromFile(filelocation); 
Intent emailIntent = new Intent(Intent.ACTION_SEND);
// set the type to 'email'
emailIntent .setType("vnd.android.cursor.dir/email");
String to[] = {"asd@gmail.com"};
emailIntent .putExtra(Intent.EXTRA_EMAIL, to);
// the attachment
emailIntent .putExtra(Intent.EXTRA_STREAM, path);
// the mail subject
emailIntent .putExtra(Intent.EXTRA_SUBJECT, "Subject");
startActivity(Intent.createChooser(emailIntent , "Send email..."));

Answer 5

您必须授予访问 gmail 存储空间的权限。

Answer 6

如果它有帮助 - 这是我在带有几个文件的应用程序调试功能中所做的，它应该没有任何不同。 在附加它们之前，我首先将它们复制/导出到用户公共文件夹中，并使它们在世界范围内可读。

 if (verifyStoragePermissions(c)) {
        final Intent intent = new Intent(Intent.ACTION_SEND_MULTIPLE);
        intent.setType("text/plain");
        intent.putExtra(Intent.EXTRA_EMAIL, new String[]{"recipient@email.address"});
        intent.putExtra(Intent.EXTRA_SUBJECT, "Email Subject");

        //build up message
        ArrayList<Uri> uris = new ArrayList<>();
        StringBuilder content = new StringBuilder();
        content.append(
                String.format(
                        c.getString(R.string.message_log_upload_email_body) +
                                "\n\nmodelDesc:%s \n\nmanuf:%s \n\naId: %s,\n\nhIid: %s,\n\nfbId: %s.",
                        Build.MODEL, Build.MANUFACTURER, getSomeVar1(), getSomeVar2(), getSomeVar3())
        );
        content.append("\n\nMy logged in account id is: ").append(getAccountId(c)).append(".");
        content.append("\n\nHere's an overview of my attachments:\n");

        for (String s : addresses) {
            File f = new File(s);
            //noinspection ResultOfMethodCallIgnored
            f.setReadable(true, false);
            Uri add = Uri.fromFile(f);
            //add attachment manifest
            content.append(String.format(Locale.UK, "|->  %s (%.3f kb)\n", f.getName(), (float) f.length() / 1024));
            uris.add(add);
        }
        //attach the things
        intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
        //set content/message
        intent.putExtra(Intent.EXTRA_TEXT, content.toString());
        c.startActivity(intent);
    }
}

addresses 是该函数的 String[] 参数。我通过使用于导出文件的函数返回它们导出的文件地址的字符串数组来构建它 - 因为我最初将文件存储在我的应用程序的私有存储中