根据Android开发者官方文档，这是发送电子邮件意图的正确方式

添加以下代码行到你的应用程序:

Intent intent = new Intent(Intent.ACTION_SEND);//common intent 
intent.setData(Uri.parse("mailto:")); // only email apps should handle this

可选:添加主体和主题，就像这样

intent.putExtra(Intent.EXTRA_SUBJECT, "Your Subject Here");
intent.putExtra(Intent.EXTRA_TEXT, "E-mail body" );

你的问题里已经加了这句话

intent.putExtra(Intent.EXTRA_EMAIL, new String[]{"hello@example.com"});

这将是收件人的地址，这意味着用户将向您(开发人员)发送电子邮件。

用Anko - kotlin

context.email(email, subject, body)

如果你只想要电子邮件客户端，你应该使用android.content.Intent。带有数组的EXTRA_EMAIL。举个例子:

final Intent result = new Intent(android.content.Intent.ACTION_SEND);
result.setType("plain/text");
result.putExtra(android.content.Intent.EXTRA_EMAIL, new String[] { recipient });
result.putExtra(android.content.Intent.EXTRA_SUBJECT, subject);
result.putExtra(android.content.Intent.EXTRA_TEXT, body);

适用于所有android版本:

String[] to = {"email@server.com"};
Uri uri = Uri.parse("mailto:email@server.com")
  .buildUpon()
  .appendQueryParameter("subject", "subject")
  .appendQueryParameter("body", "body")
  .build();
Intent emailIntent = new Intent(ACTION_SENDTO, uri);
emailIntent.putExtra(EXTRA_EMAIL, TO);
startActivity(Intent.createChooser(emailIntent, "Send mail..."));

更新到Android 10，现在使用Kotlin…

fun Context.sendEmail(
  address: String?,
  subject: String?,
  body: String?,
) {
  val recipients = arrayOf(address)
  val uri = address.toUri()
    .buildUpon()
    .appendQueryParameter("subject", subject)
    .appendQueryParameter("body", body)
    .build()
  val emailIntent = Intent(ACTION_SENDTO, uri).apply {
    setData("mailto:$address".toUri());
    putExtra(EXTRA_SUBJECT, subject);
    putExtra(EXTRA_TEXT, body);
    putExtra(EXTRA_EMAIL, recipients)
  }
  val pickerTitle = getString(R.string.some_title)
  ContextCompat.startActivity(this, Intent.createChooser(emailIntent, pickerTitle, null)
}

.．.在更新到API 30之后，代码没有填充电子邮件客户端的主题和主体(例如Gmail)。但我在这里找到了答案:

fun Context.sendEmail(
  address: String?,
  subject: String?,
  body: String?,
) {
  val selectorIntent = Intent(ACTION_SENDTO)
    .setData("mailto:$address".toUri())
  val emailIntent = Intent(ACTION_SEND).apply {
    putExtra(EXTRA_EMAIL, arrayOf(address))
    putExtra(EXTRA_SUBJECT, subject)
    putExtra(EXTRA_TEXT, body)
    selector = selectorIntent
  }
  startActivity(Intent.createChooser(emailIntent, getString(R.string.send_email))) 

}

我几乎在android 11上使用了所有的答案，但它们不能正常工作。其中一些没有将mailto放在所需的字段上，另一些甚至根本不起作用。所以我确实阅读了新的文档，发现mailto电子邮件应该在一个数组中，所以对我有用的最后是在这里。 不管怎样，谢谢你的回答，毕竟他们帮了大忙。

//mail me
findViewById<TextView>(R.id.mailme).setOnTouchListener { _, _ ->
    try {
        val mail: Array<String> = arrayOf("somemail@cc.com")
        val mailme = Intent(Intent.ACTION_SENDTO).apply {
            data = Uri.parse("mailto:")
            putExtra(Intent.EXTRA_EMAIL, mail)
            putExtra(Intent.EXTRA_TEXT, "Hey We Need Your Help With This Issue.")
            putExtra(Intent.EXTRA_SUBJECT, "At Logs Calculator, We Need Your Help !")
        }
        startActivity(mailme)
    } catch (e: Exception) {
        e.printStackTrace()
    }
    true
}

这段代码在我的设备中工作

Intent mIntent = new Intent(Intent.ACTION_SENDTO);
mIntent.setData(Uri.parse("mailto:"));
mIntent.putExtra(Intent.EXTRA_EMAIL  , new String[] {"mahendrarajdhami@gmail.com"});
mIntent.putExtra(Intent.EXTRA_SUBJECT, "");
startActivity(Intent.createChooser(mIntent, "Send Email Using..."));