为了发送带有附加二进制错误日志文件的电子邮件，我使用了当前接受的答案。GMail和K-9发送得很好，在我的邮件服务器上也很好。唯一的问题是我选择的邮件客户端Thunderbird，它在打开/保存附加的日志文件时遇到了麻烦。事实上，它根本没有保存文件，没有抱怨。

我查看了其中一封邮件的源代码，注意到日志文件附件具有mime类型消息/rfc822(这是可以理解的)。当然这个附件不是附件邮件。但雷鸟无法优雅地处理这个微小的错误。所以这有点令人沮丧。

经过一些研究和实验，我想出了以下解决方案:

public Intent createEmailOnlyChooserIntent(Intent source,
    CharSequence chooserTitle) {
    Stack<Intent> intents = new Stack<Intent>();
    Intent i = new Intent(Intent.ACTION_SENDTO, Uri.fromParts("mailto",
            "info@example.com", null));
    List<ResolveInfo> activities = getPackageManager()
            .queryIntentActivities(i, 0);

    for(ResolveInfo ri : activities) {
        Intent target = new Intent(source);
        target.setPackage(ri.activityInfo.packageName);
        intents.add(target);
    }

    if(!intents.isEmpty()) {
        Intent chooserIntent = Intent.createChooser(intents.remove(0),
                chooserTitle);
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS,
                intents.toArray(new Parcelable[intents.size()]));

        return chooserIntent;
    } else {
        return Intent.createChooser(source, chooserTitle);
    }
}

它可以这样使用:

Intent i = new Intent(Intent.ACTION_SEND);
i.setType("*/*");
i.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(crashLogFile));
i.putExtra(Intent.EXTRA_EMAIL, new String[] {
    ANDROID_SUPPORT_EMAIL
});
i.putExtra(Intent.EXTRA_SUBJECT, "Crash report");
i.putExtra(Intent.EXTRA_TEXT, "Some crash report details");

startActivity(createEmailOnlyChooserIntent(i, "Send via email"));

如您所见，可以很容易地为createEmailOnlyChooserIntent方法提供正确的意图和正确的mime类型。

然后，它遍历响应ACTION_SENDTO邮件协议意图(仅是电子邮件应用程序)的可用活动列表，并基于该活动列表和具有正确mime类型的原始ACTION_SEND意图构造一个选择器。

另一个优点是Skype不再被列出(这恰好响应rfc822 mime类型)。

其他解决方案可以是

Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
emailIntent.setType("plain/text");
emailIntent.setClassName("com.google.android.gm", "com.google.android.gm.ComposeActivityGmail");
emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{"someone@gmail.com"});
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Yo");
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Hi");
startActivity(emailIntent);

假设大多数android设备已经安装了GMail应用程序。

这个函数首先直接意图gmail发送电子邮件，如果gmail没有找到，然后提升意图选择器。我在许多商业应用程序中使用了这个功能，它工作得很好。希望对你有所帮助:

public static void sentEmail(Context mContext, String[] addresses, String subject, String body) {

    try {
        Intent sendIntentGmail = new Intent(Intent.ACTION_VIEW);
        sendIntentGmail.setType("plain/text");
        sendIntentGmail.setData(Uri.parse(TextUtils.join(",", addresses)));
        sendIntentGmail.setClassName("com.google.android.gm", "com.google.android.gm.ComposeActivityGmail");
        sendIntentGmail.putExtra(Intent.EXTRA_EMAIL, addresses);
        if (subject != null) sendIntentGmail.putExtra(Intent.EXTRA_SUBJECT, subject);
        if (body != null) sendIntentGmail.putExtra(Intent.EXTRA_TEXT, body);
        mContext.startActivity(sendIntentGmail);
    } catch (Exception e) {
        //When Gmail App is not installed or disable
        Intent sendIntentIfGmailFail = new Intent(Intent.ACTION_SEND);
        sendIntentIfGmailFail.setType("*/*");
        sendIntentIfGmailFail.putExtra(Intent.EXTRA_EMAIL, addresses);
        if (subject != null) sendIntentIfGmailFail.putExtra(Intent.EXTRA_SUBJECT, subject);
        if (body != null) sendIntentIfGmailFail.putExtra(Intent.EXTRA_TEXT, body);
        if (sendIntentIfGmailFail.resolveActivity(mContext.getPackageManager()) != null) {
            mContext.startActivity(sendIntentIfGmailFail);
        }
    }
}

/**
 * Will start the chosen Email app
 *
 * @param context    current component context.
 * @param emails     Emails you would like to send to.
 * @param subject    The subject that will be used in the Email app.
 * @param forceGmail True - if you want to open Gmail app, False otherwise. If the Gmail
 *                   app is not installed on this device a chooser will be shown.
 */
public static void sendEmail(Context context, String[] emails, String subject, boolean forceGmail) {

    Intent i = new Intent(Intent.ACTION_SENDTO);
    i.setData(Uri.parse("mailto:"));
    i.putExtra(Intent.EXTRA_EMAIL, emails);
    i.putExtra(Intent.EXTRA_SUBJECT, subject);
    if (forceGmail && isPackageInstalled(context, "com.google.android.gm")) {
        i.setPackage("com.google.android.gm");
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
    } else {
        try {
            context.startActivity(Intent.createChooser(i, "Send mail..."));
        } catch (ActivityNotFoundException e) {
            Toast.makeText(context, "No email app is installed on your device...", Toast.LENGTH_SHORT).show();
        }
    }
}

/**
 * Check if the given app is installed on this devuice.
 *
 * @param context     current component context.
 * @param packageName The package name you would like to check.
 * @return True if this package exist, otherwise False.
 */
public static boolean isPackageInstalled(@NonNull Context context, @NonNull String packageName) {
    PackageManager pm = context.getPackageManager();
    if (pm != null) {
        try {
            pm.getPackageInfo(packageName, 0);
            return true;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
    }
    return false;
}

最好的(也是最简单的)方法是使用Intent:

Intent i = new Intent(Intent.ACTION_SEND);
i.setType("message/rfc822");
i.putExtra(Intent.EXTRA_EMAIL  , new String[]{"recipient@example.com"});
i.putExtra(Intent.EXTRA_SUBJECT, "subject of email");
i.putExtra(Intent.EXTRA_TEXT   , "body of email");
try {
    startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
    Toast.makeText(MyActivity.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
}

否则你就得自己写客户端了。

import androidx.core.app.ShareCompat
import androidx.core.content.IntentCompat

ShareCompat.IntentBuilder(this)
                .setType("message/rfc822")
                .setEmailTo(arrayOf(email))
                .setStream(uri)
                .setSubject(subject)
                .setText(message + emailMessage)
                .startChooser()