Gmail “Can't attach empty file”

问题

My app creates a PDF using iText library (template PDF with forms which are filled) and I want to then attach it to an email to send. When I try to attach the file I get the error Can't attach empty file in the Gmail app. Have also tried with the HTC email app and Touchdown email app - both of which just don't attach anything and give no error.

Creating the PDF:

public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
        PdfReader reader = new PdfReader(src);
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
        AcroFields form = stamper.getAcroFields();

// Fill all PDF forms here (theres quite a few)

        stamper.setFormFlattening(true);
        stamper.close();
        reader.close();
}

Attempting to attach file and send email:

public void sendMail(){
    Intent emailIntent = new Intent(Intent.ACTION_SEND);
    emailIntent .setType("*/*");
    emailIntent .putExtra(Intent.EXTRA_EMAIL, "blah@gmail.com");
    emailIntent .putExtra(Intent.EXTRA_STREAM, Uri.parse(dest));
    emailIntent .putExtra(Intent.EXTRA_SUBJECT, "Subject");
    startActivity(Intent.createChooser(emailIntent, "Send email..."));
}

Where dest is the path and filename of the file in question. I know the path and filename in dest are ok as this is the var used to save the file (which I can view fine on both the device and on a PC).

Gmail logcat:

06-26 00:24:48.901  14476-14476/? E/Gmail﹕ Error adding attachment
    com.android.mail.utils.b: Cannot attach empty attachment
            at com.android.mail.ui.ComposeAttachmentTileGrid.a(SourceFile:62)
            at com.android.mail.compose.c.b(SourceFile:1933)
            at com.android.mail.compose.c.c(SourceFile:2063)
            at com.android.mail.compose.c.a(SourceFile:7992)
            at com.android.mail.compose.c.q(SourceFile:759)
            at com.android.mail.compose.c.onCreate(SourceFile:4830)
            at com.google.android.gm.ComposeActivityGmail.onCreate(SourceFile:194)
            at android.app.Activity.performCreate(Activity.java:5958)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:155)
            at android.app.ActivityThread.main(ActivityThread.java:5696)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)

回答1:

I was facing a similar issue. CommonsWare's comment above resolved it.!

Create a File object and generate a Uri using Uri.fromFile() method.

File file = new File(filePath);
Uri uri = Uri.fromFile(file);

回答2:

I ran into the same problem on Nexus 5 with Android 6 (the same code worked on my Nexus 6 with Android 6), found explanation and working solution here: https://stackoverflow.com/a/32982050/534898

来源：https://stackoverflow.com/questions/31062506/gmail-cant-attach-empty-file