Send Email From Android Applications

January 07, 2014
Written by
Elmer Thomas
Opinions expressed by Twilio contributors are their own

Send Email From Android Applications

I have been playing with Google Glass lately, which got me working more with Android. Since I recently built my first native Android app, I thought I'd share how to send email and retrieve statistics using the SendGrid Java library. Since this is my first attempt, please send a pull request or open an issue if I did something unholy. You may find the complete source code at Github.

If you are not interested in native Android development, check out our tutorial based on the AppMobi platform.

If you are new to Android native development, I suggest you start with the tutorial at the Android Developer website. Complete all lessons under “Building Your First App.”

If you want to skip straight to the end with a working app, clone this repo, modify the, import the project into Eclipse and click the run icon. Otherwise, the following steps assume you have completed the Android tutorial, ending on this lesson.

Set Up the Form

First, set up the default string constants.

Android layout

Next, we will create a simple form that will collect the information we will need to send an email. Here is the XML used to create the form, update yours accordingly. When complete, the graphical layout should look like the above.

Set Up the Display

Now, we need to set up a page where the results will appear when you click the send button on the input form. This is the XML required for the display.

android statistics

Your graphical layout should look like the above.

Send an Email

First, we have to make sure we add permissions for our app to access the Internet for our Web API calls. This is done with the uses-permission tag, like so.

Download the SendGrid Java library (I am using version 0.1.2 for this tutorial) and sign up for a SendGrid account if you don’t have one. Use these instructions to add the library to your project.

The code that sends an email is in the file.

You will need to import the SendGrid Java library as follows: import com.github.sendgrid.SendGrid; import com.thinkingserious.sendgrid.R;

Next, you will create the class SendEmailWithSendGrid. Note that I only implemented a subset of the API. Check out the full capabilities of the SendGrid Java API on Github.

Finally, you will tie the results from the form to the API call via the implementation in the sendMessage function.

Display Some Statistics

The file contains the implementation that displays the results from our email send. However, instead of just returning the status of our email send, we will include a few statistics.

The class StatsFromSendGrid will handle the call to our Web API. For a complete view of what the stats endpoint has to offer, please review the documentation.

Finally, we need to modify the onCreate function, which gets called from the sendMessage function, that itself gets called when the button is clicked.

At this point you should have a working app that can send an email and display statistics via SendGrid.

Tell us About Your App

Now that you understand how to integrate SendGrid into a native Android app, we want to know what you create. Be sure to let us know so that we may feature you in our Developer Community.

Happy Hacking!

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