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最新推荐文章于 2025-08-08 23:51:41 发布

zheng3stone

最新推荐文章于 2025-08-08 23:51:41 发布

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分类专栏： android developer tiny share 文章标签： android 邮件电子邮件 ACTION_SENDTO mailto

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本文介绍如何使用Android的Intent来发送带有附件的电子邮件。通过不同Intent动作可以实现无附件、单个附件及多个附件的邮件发送功能，并展示了具体的Intent构造方法。

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今天讲使用intent发送邮件的例子。

Email
Compose an email with optional attachments
To compose an email, use one of the below actions based on whether you'll include attachments, and include email details such as the recipient and subject using the extra keys listed below.

Action
ACTION_SENDTO (for no attachment) or
  ACTION_SEND (for one attachment) or
  ACTION_SEND_MULTIPLE (for multiple attachments)
Data URI Scheme
  None
MIME Type
  "text/plain"
  "*/*"
Extras
  Intent.EXTRA_EMAIL
      A string array of all "To" recipient email addresses.
  Intent.EXTRA_CC
      A string array of all "CC" recipient email addresses.
  Intent.EXTRA_BCC
      A string array of all "BCC" recipient email addresses.
  Intent.EXTRA_SUBJECT
      A string with the email subject.
  Intent.EXTRA_TEXT
      A string with the body of the email.
  Intent.EXTRA_STREAM
      A Uri pointing to the attachment. If using the ACTION_SEND_MULTIPLE action, this should instead be an ArrayList containing multiple Uri objects.
Example intent:

public void composeEmail(String[] addresses, String subject, Uri attachment) {
    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.setType("*/*");
    intent.putExtra(Intent.EXTRA_EMAIL, addresses);
    intent.putExtra(Intent.EXTRA_SUBJECT, subject);
    intent.putExtra(Intent.EXTRA_STREAM, attachment);
    if (intent.resolveActivity(getPackageManager()) != null) {
        startActivity(intent);
    }
}

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);
    }
}

Example intent filter:

<activity ...>
    <intent-filter>
        <action android:name="android.intent.action.SEND" />
        <data android:type="*/*" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
    <intent-filter>
        <action android:name="android.intent.action.SENDTO" />
        <data android:scheme="mailto" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>