Android Intent Chooser to only show E-mail option

There is a way more generic to do that, working with any MIME type.

See this post: How to customize share intent in Android?

Just struggled with this problem while implementing a Magic Link feature, a chooser intent for all installed email apps:

Chooser Intent Screenshot

private void openEmailApp() {
  List<Intent> emailAppLauncherIntents = new ArrayList<>();

  //Intent that only email apps can handle:
  Intent emailAppIntent = new Intent(Intent.ACTION_SENDTO);
  emailAppIntent.setData(Uri.parse("mailto:"));
  emailAppIntent.putExtra(Intent.EXTRA_EMAIL, "");
  emailAppIntent.putExtra(Intent.EXTRA_SUBJECT, "");

  PackageManager packageManager = getPackageManager();

  //All installed apps that can handle email intent:
  List<ResolveInfo> emailApps = packageManager.queryIntentActivities(emailAppIntent, PackageManager.MATCH_ALL);

  for (ResolveInfo resolveInfo : emailApps) {
    String packageName = resolveInfo.activityInfo.packageName;
    Intent launchIntent = packageManager.getLaunchIntentForPackage(packageName);
    emailAppLauncherIntents.add(launchIntent);
  }

  //Create chooser
  Intent chooserIntent = Intent.createChooser(new Intent(), "Select email app:");
  chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, emailAppLauncherIntents.toArray(new Parcelable[emailAppLauncherIntents.size()]));
  startActivity(chooserIntent);
}

To solve this issue simply follow the official documentation. The most important consideration are:

1. The flag is ACTION_SENDTO, and not ACTION_SEND.

2. The setData of method of the intent,

   intent.setData(Uri.parse("mailto:")); // only email apps should handle this

If you send an empty Extra, the if() at the end won't work and the app won't launch the email client.

This works for me. According to Android documentation. If you want to ensure that your intent is handled only by an email app (and not other text messaging or social apps), then use the ACTION_SENDTO action and include the "mailto:" data scheme. For example:

public void composeEmail(String[] addresses, String subject) {
    Intent intent = new Intent(Intent.ACTION_SENDTO);
    intent.setData(Uri.parse("mailto:")); // only email apps should handle this
    intent.putExtra(Intent.EXTRA_EMAIL, addresses);
    intent.putExtra(Intent.EXTRA_SUBJECT, subject);
    if (intent.resolveActivity(getPackageManager()) != null) {
        startActivity(intent);
    }
}

https://developer.android.com/guide/components/intents-common.html#Email

I am presuming that you are using the ACTION_SEND Intent action, since you did not bother to actually state what you're using, but you agreed with @Aleadam's comment.

I'm using the application/octet-stream as the SetType for the Intent.

Nothing in that sentence limits things to email.

ACTION_SEND is a generic Intent action that can be supported by any application that wants to. All you do is indicate what data you are sharing and the MIME type of that data -- from there, it is up to the user to choose from available activities.

As @Jasoon indicates, you can try message/rfc822 as the MIME type. However, that is not indicating "only offer email clients" -- it indicates "offer anything that supports message/rfc822 data". That could readily include some application that are not email clients.

If you specifically want to send something by email, integrate JavaMail into your app, or write an email forwarding script on your Web server and invoke it, or something. If you use ACTION_SEND, you are implicitly stating that it is what the user wants that matters, and you want the user to be able to send such-and-so data by whatever means the user chooses.