要实现将Android日志行定期发送为电子邮件，可以使用以下步骤：

1. 在Android的AndroidManifest.xml文件中添加以下权限：

2. 创建一个LogEmailSender类，该类用于发送日志行作为电子邮件。在该类中，可以使用JavaMail API来发送电子邮件。以下是一个示例代码：

import javax.mail.*;
import javax.mail.internet.*;
import java.util.Properties;

public class LogEmailSender {

    private String email;
    private String password;
    private String recipient;
    private Properties properties;

    public LogEmailSender(String email, String password, String recipient) {
        this.email = email;
        this.password = password;
        this.recipient = recipient;

        // SMTP server properties
        properties = new Properties();
        properties.put("mail.smtp.host", "smtp.gmail.com");
        properties.put("mail.smtp.port", "587");
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");
    }

    public void sendLogEmail(String subject, String content) throws MessagingException {
        Session session = Session.getInstance(properties, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(email, password);
            }
        });

        // Create email message
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(email));
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(recipient));
        message.setSubject(subject);
        message.setText(content);

        // Send email
        Transport.send(message);
    }

}

3. 在需要定期发送日志行的地方，可以使用以下代码示例。在示例中，我们每隔一段时间发送一次日志行。你可以根据需求修改代码来满足你的要求：

import android.os.Handler;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private Handler handler;
    private LogEmailSender emailSender;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Initialize email sender
        emailSender = new LogEmailSender("your_email@gmail.com", "your_password", "recipient_email@gmail.com");

        // Initialize handler and schedule sending email every 10 seconds
        handler = new Handler();
        handler.postDelayed(sendLogRunnable, 10000);
    }

    private Runnable sendLogRunnable = new Runnable() {
        @Override
        public void run() {
            // Get logs
            String logs = getLogs();

            try {
                // Send logs as email
                emailSender.sendLogEmail("Android Logs", logs);
            } catch (MessagingException e) {
                Log.e(TAG, "Failed to send email: " + e.getMessage());
            }

            // Schedule next sending after 10 seconds
            handler.postDelayed(this, 10000);
        }
    };

    private String getLogs() {
        // Get logs here, e.g., from Logcat or any other source
        return "Sample Log";
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // Remove the callback to stop sending emails
        handler.removeCallbacks(sendLogRunnable);
    }
}

请注意，以上示例代码需要你的手机或模拟器具有互联网连接才能发送电子邮件。你还需要在LogEmailSender类中使用你自己的有效的电子邮件地址和密码。