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Exercise session 1 11.09.2018 Sergey Ryabov

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Are you ready? Do you have Android Studio installed? Have you created and ran your first project? If not yet, please, do exercise 0 first to set up your environment Install Android Studio and have “Hello world” running on your phone:

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Overview We’ll create a simple app with two activities First activity with an EditText view and a “Preview” button The user enters a message into the EditText and hits “Preview”

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Overview This opens a second activity with “Email” button and a TextView that displays the message. You can check the text and if it’s good enough, you can send it via email app by clicking “Email” button

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Overview Clicking on the “Email” button opens the email app which is installed on the device (e.g. gmail) with the message as a new email’s content.

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Let’s Begin Solution will be available here: in one week, before the next lecture. Now it’s time for you to make progress!!

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Step 1 - Create a new project For help go to the lecture slides:

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Step 2 Create the main activity layout, something like this See next slide for more info

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About EditText EditText is a View that allows the user to enter text. When the user clicks on it, the keyboard opens. Using view attribute “inputType”, you can indicate which keyboard should pop up (only numbers, all caps, email etc…) Documentation:

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About EditText “hint” attribute is the text that will be shown when no text was entered. To get the entered text dynamically at runtime use editText.getText().toString().

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Step 2 - Now you can Create the main activity layout. Feel free to edit the design with what we learned in class (don’t waste too much time on it, we have more stuff to do :) )

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Step 3 On Preview button click: Open a new activity with a TextView which shows the message you typed in on the previous activity. [want more guidance? See steps 1-3 on next slides]

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Step 3 - steps[1/3] Create a new Activity class (Empty Activity) Edit the activity’s layout as needed

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Step 3 - steps[2/3] 3. Set OnClickListener to your button and implement the code: Create an intent that starts the new activity and passes the text from the EditText through the intent’s extras, like in the lecture slides.

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Step 3 - steps[3/3] 4. On the second activity: get the message from the intent’s extras 5. On the second activity: show the message in the activity’s TextView

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Step 4 On Email button click: Open a new email activity Pre-fill the email “To” with your email address Pre-fill the email “Subject” with some predefined text Pre-fill the email “Body” with your message See next slide for more info

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Open an Email App In the lecture we used an explicit intent to open a specific activity which we created and knew about. What happens when we want to start just any activity that can perform our task? I.e. any activity that can send an email or take a photo or dial a number or navigate. We can use an implicit intent. We just tell what we want to do and Android will suggest the apps those can provide that functionality.

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Implicit Intents Use this: To find out how to create an email implicit intent and which keys to add to the intent bundle. Hint: Look for SEND_TO action WARNING: pay attention to this caution notice

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Toasts

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DONE? That’s amazing! Great job!! But we have some bonus tasks if you wanna try. If you have even a small question - don’t forget to ask the mentors in class or on Slack.

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Bonus Make sure your all of your strings and dimensions are not hardcoded in XML files, but rather are extracted to the corresponding resource XML files (strings.xml, dimens.xml) Create a different layout for landscape as we saw in the lecture. Make your app Russian (or other language) compatible. See next slide for details.

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Localization [1/2] To create other language localization: Open strings.xml On the top right : “open editor” On the top left: click the globe icon and select the language you want.

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Localization [2/2] Fill in the translations in the editor In the left Project structure panel find the new strings.xml that was created with the new locale. Click on it to explore the xml. Change your device’s language settings (if not in Russian yet) Run and check your Russianized app! Check out real folder structure of your project to understand the concept