Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts("mailto", email, null));
if (emailIntent.resolveActivity(context.getPackageManager()) != null) {
    context.startActivity(Intent.createChooser(emailIntent, "Send Email..."));
} else {
    Toast.makeText(context, "No apps can perform this action.", Toast.LENGTH_SHORT).show();
}

这就是我使用的方法，对我来说很有效:

//variables
String subject = "Whatever subject you want";
String body = "Whatever text you want to put in the body";
String intentType = "text/html";
String mailToParse = "mailto:";

//start Intent
Intent variableName = new Intent(Intent.ACTION_SENDTO);
variableName.setType(intentType);
variableName.setData(Uri.parse(mailToParse));
variableName.putExtra(Intent.EXTRA_SUBJECT, subject);
variableName.putExtra(Intent.EXTRA_TEXT, body);

startActivity(variableName);

这也可以让用户选择他们喜欢的电子邮件应用程序。唯一不允许你做的是设置收件人的电子邮件地址。

String sendEmailTo = "abc@xyz.com";
String subject = "Subject";
String body = "Body";
            
Uri uri = Uri.parse("mailto:"+sendEmailTo+"?subject="+subject+"&body="+body);
    
startActivity(new Intent(Intent.ACTION_VIEW, uri);

这对我很管用。这将只在意图选择器中显示邮件应用程序。

另外: 我使用这种方法遇到的一个问题是我无法在建议和正文中添加空格。 因此，要在建议或正文文本中放置空格，请将空格替换为%20

下面的代码对我来说很好。

Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("message/rfc822");
intent.putExtra(Intent.EXTRA_SUBJECT, subject);
intent.putExtra(Intent.EXTRA_EMAIL, new String[]{"abc@gmailcom"});
Intent mailer = Intent.createChooser(intent, null);
startActivity(mailer);

主要有三种方法:

String email = /* Your email address here */
String subject = /* Your subject here */
String body = /* Your body here */
String chooserTitle = /* Your chooser title here */

1. 自定义Uri:

Uri uri = Uri.parse("mailto:" + email)
    .buildUpon()
    .appendQueryParameter("subject", subject)
    .appendQueryParameter("body", body)
    .build();

Intent emailIntent = new Intent(Intent.ACTION_SENDTO, uri);
startActivity(Intent.createChooser(emailIntent, chooserTitle));

2. 使用Intent附加:

Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.parse("mailto:" + email));
emailIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
emailIntent.putExtra(Intent.EXTRA_TEXT, body);
//emailIntent.putExtra(Intent.EXTRA_HTML_TEXT, body); //If you are using HTML in your body text

startActivity(Intent.createChooser(emailIntent, "Chooser Title"));

3.支持库ShareCompat:

Activity activity = /* Your activity here */

ShareCompat.IntentBuilder.from(activity)
    .setType("message/rfc822")
    .addEmailTo(email)
    .setSubject(subject)
    .setText(body)
    //.setHtmlText(body) //If you are using HTML in your body text
    .setChooserTitle(chooserTitle)
    .startChooser();

有时你需要打开默认的电子邮件应用程序来查看收件箱，而不创建新的信件，在这种情况下，它将有帮助:

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_APP_EMAIL);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
if (intent.resolveActivity(getPackageManager()) != null) {
    startActivity(intent);
}