By Wallace Jackson
Anybody can commence development basic apps for the Android platform, and this ebook will exhibit you how! lately up to date to incorporate Android Jelly Bean, Android Apps for Absolute newbies, moment Edition takes you thru the method of having your first Android apps up and working utilizing simple English and functional examples.
This booklet cuts in the course of the fog of jargon and secret that surrounds Android apps improvement, and provides you easy, step by step directions to get you started.
- Teaches Android software improvement in language someone can comprehend, providing you with the very best begin in Android improvement
- Provides easy, step by step examples that make studying effortless, permitting you to choose up the thoughts with no fuss
- Offers transparent code descriptions and format that you should get your apps operating once attainable
This ebook is Android Jelly Bean compliant, yet is backwards suitable to many of the earlier Android releases.
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Xml tab and try the code that Eclipse (more appropriately, the ADT plug-in) wrote for us. You’ll see a SlidingDrawer box inside the RelativeLayout box, and within the sliding drawer one can find a Button UI point used for the SlidingDrawer “handle” (a SlidingDrawer UI aspect should always have a deal with outlined) and a LinearLayout box able to carry your content material that might be inside the SlidingDrawer. determine 6-19 exhibits the XML code that used to be auto-generated. determine 6-19 . XML markup generated by means of the Graphical format Editor for the SlidingDrawer tag if you happen to like, you could right-click at the undertaking identify and do a Run As Android program and notice the deal with on the backside of the monitor, click on it, watch it animate to the pinnacle of the display (opening the drawer), after which click on it back, and watch it animate backtrack to its unique place (i. e. , drawer closed). Then shut the emulator and return to the Eclipse Graphical structure Editor tab, in order that we will be able to upload an AnalogClock item (widget) within the drawer to offer our app a few worthwhile performance. locate the AnalogClock icon lower than the Time and Date part on the left aspect of the Graphical structure Editor and drag the AnalogClock widget icon onto the UI sector at the correct. when you drop it, you could have a sq. resizable zone on the upper-left of the box (default place of 0,0 as we realized approximately previously). proven less than in determine 6-20 is the drag operation we went via to put the AnalogClock UI widget into our SlidingDrawer; detect that Eclipse ADT offers directions for positioning as you're dragging the UI parts into position; back, make sure to mess around a section with this performance to get used to it, after which to leverage it thoroughly in your improvement virtue. determine 6-20 . Dragging and positioning the AnalogClock widget in the SlidingDrawer box seize the bottom-right deal with of the AnalogClock widget field and drag it down and to the perfect till it fills the box (screen). this can heart the AnalogClock widget at the reveal (the AnalogClock widget doesn't scale as a number of the different UI widgets do). you may imagine for you to click on and drag in the midst of this sq. region to maneuver and place it, yet when you attempt that, you will see it doesn't paintings that method, so place it with the lower-right deal with as a substitute. ADT will convey you the unique dimension (green sq.) and the hot measurement (orange sq.) as you drag the deal with, as proven on determine 6-21. determine 6-21 . Positioning the AnalogClock dimension limitations within the SlidingDrawer through the Graphical format tab Now let’s have a look at the XML markup that was once generated for us, by way of easily clicking at the activity_main. xml tab. There may still now be an AnalogClock tag inside the LinearLayout tag, which there's, as proven in determine 6-22. We now can see a very reliable instance of tags which are nested deeply within one another. determine 6-22 . XML markup generated via Graphical format Editor for AnalogClock widget Let’s right-click at the venture identify and Run As Android program to work out our SlidingDrawer open up and provides us a well established analog clock.