Download E-books Head First Android Development PDF

By Dawn Griffiths, David Griffiths

What will you examine from this book?

If you may have an idea for a killer Android app, this ebook may help you construct your first operating software in a few minutes. You’ll research hands-on the best way to constitution your app, layout interfaces, create a database, make your app paintings on quite a few smartphones and drugs, and lots more and plenty extra. It’s like having an skilled Android developer sitting correct subsequent to you! All you wish is a few Java information to get started.

Why does this publication glance so different?

Based at the most recent examine in cognitive technological know-how and studying thought, Head First Android Development makes use of a visually wealthy structure to interact your brain, instead of a text-heavy method that places you to sleep. Why waste it slow suffering from new techniques? This multi-sensory studying adventure is designed for a way your mind quite works.

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ACTION_SEND to ship a message. So which will create an cause that specifies you need to ship a message, you employ reason cause = new Intent(Intent. ACTION_SEND); including additional details as soon as you’ve certain the motion you need to use, you could upload additional info to it. we wish to go a few textual content with the rationale that would shape the physique of the message we’re sending. to do that, you utilize the next strains of code: cause. setType("text/plain"); motive. putExtra(Intent. EXTRA_TEXT, messageText); the place messageText is the textual content you need to ship. This tells Android that you really want the job which will deal with info with a MIME data-type of “text/plain”, and likewise tells it what the textual content is. you can also make additional calls to the putExtra() strategy if there’s more information you need to upload. for example, on the way to specify the topic of the message, you may also use reason. putExtra(Intent. EXTRA_SUBJECT, subject); the place topic is the message topic. We’ve advised the purpose which classification it’s meant for, yet what if we don’t comprehend? you will discover out extra concerning the varieties of task activities you should use and the additional details they help within the Android developer reference fabric: http://tinyurl. com/ n57qb5. those attributes relate to cause. ACTION_SEND. They’re now not correct for all activities. If topic isn’t correct to a selected app, it is going to simply forget about this data. Any apps that understand how to take advantage of it's going to accomplish that. you're right here 4  97 use an motion Specify motion Create chooser switch the purpose to exploit an motion We’ll replace CreateMessageActivity. java in order that we create an implicit rationale that makes use of a ship motion. Make the alterations highlighted less than, and retailer your paintings: package deal com. hfad. messenger; import android. os. package deal; import android. app. job; Messenger app/src/main import android. content material. rationale; java import android. view. View; import android. widget. EditText; com. hfad. messenger public category CreateMessageActivity extends job { CreateMessage job. java @Override safe void onCreate(Bundle savedInstanceState) { tremendous. onCreate(savedInstanceState); } setContentView(R. format. activity_create_message); //Call onSendMessage() whilst the button is clicked public void onSendMessage(View view) { EditText messageView = (EditText)findViewById(R. identification. message); String messageText = messageView. getText(). toString(); get rid of those traces. motive purpose = new Intent(this, ReceiveMessageActivity. class); reason. putExtra(ReceiveMessageActivity. EXTRA_MESSAGE, messageText); motive rationale = new Intent(Intent. ACTION_SEND); motive. setType("text/plain"); purpose. putExtra(Intent. EXTRA_TEXT, messageText); } } startActivity(intent); Let’s holiday down what occurs whilst the person clicks at the ship Message button. 98  Chapter three rather than growing an motive that’s explicitly for ReceiveMessageActivity, we’re developing an reason that makes use of a ship motion. a number of actions and intents What occurs while the code runs 1 2 whilst the onSendMessage() technique is named, an purpose will get created.

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