By Paul Ferrill
Pro Android Python with SL4A is for programmers and hobbyists who are looking to write apps for Android units with no need to benefit Java first. Paul Ferrill leads you from fitting the Scripting Layer for Android (SL4A) to writing small scripts, to extra complex and engaging initiatives, and at last to importing and packaging your courses to an Android device.
Android runs scripts in lots of scripting languages, yet Python, Lua, and Beanshell are fairly well known. so much programmers comprehend multiple programming language, in order that they have the simplest instrument for no matter what activity they wish to complete. Pro Android Python with SL4A explores the realm of Android scripting via introducing you to an important open-source programming languages which are on hand on Android-based undefined.
Pro Android Python with SL4A begins via exploring the Android software improvement kit and then exhibits you the way to establish an Eclipse-based Android improvement surroundings. then you definately method the area of Android programming by utilizing Beanshell, which runs at the Dalvik, and studying tips on how to write small courses to manage an Android device.
Next, detect how Lua, a light-weight language ideally fitted for scripting on smaller units, can paintings with Android. Lua can be utilized for small yet vital initiatives, like SMS encryption and synchronizing pictures with flickr.
Last, yet under no circumstances least, you can find the realm of Python scripting for SL4A, and the ability contained in the complete variety of Python modules that could mix with the Android SDK. you are going to discover ways to write small location-aware apps to get you began, yet by means of the top of this booklet, you can find your self writing totally GUI-fied purposes working at the Android desktop!
Pro Android Python with SL4A is rounded out with a bankruptcy on dispensing and packaging scripts, a ability that you're going to locate very invaluable as you succeed in out to a much wider viewers together with your courses.
What you’ll learn
- Understand the SL4A
- Explore the Android software improvement package
- Write scripts to manage an Android mobilephone
- Write and execute complete Python and purposes
- Learn how one can write basic apps utilizing Facades
- Explore the whole Android improvement strategy, from improvement to packaging
Who this booklet is for
This is a e-book for starting and intermediate Android builders, and a e-book for somebody coding in Python, Lua or exploring Beanshell.
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Cause. motion. VIEW', 'file://' + target_path, 'audio/mp3') when you have a couple of app put in in your machine that may play media, you will get one other conversation field urged to decide on which one to take advantage of. you are going to even have the choice to make that choice the default for the dossier variety mp3. while the person chooses a listing, the app makes use of recursion to reload the subsequent listing with the next line of code: if os. direction. isdir(target_path): show_dir(target_path) the opposite alternative, if the consumer has opened a subdirectory, is to move up one point. the road of code that assessments for this can be as follows: if aim == '.. ': target_path = os. direction. dirname(path) So, if the consumer selects the road with '.. ', the code will set target_path to the string course. The preliminary worth for direction is determined to the string base_dir while the show_dir functionality is named, as noticeable the following: def show_dir(path=base_dir): word Recursion is a smart technique to create a captive UI–meaning a similar code gets done a number of instances till the person exits in a manner that you just hope. determine 8-24. checklist of . mp3 records from podplayer. py the ultimate UI for our Podplayer app is proven in determine 8-24. here is what the full code feels like: import android, os, time droid = android. Android() # Specify our root podcasts listing and confirm it exists. base_dir = '/sdcard/sl4a/scripts/podcasts' if no longer os. course. exists(base_dir): os. makedirs(base_dir) def show_dir(path=base_dir): """Shows the contents of a listing in a listing view. """ # The documents & directories less than "path". nodes = os. listdir(path) # Make the way to cross up a degree. if direction ! = base_dir: nodes. insert(0, '.. ') droid. dialogCreateAlert(os. direction. basename(path). title()) droid. dialogSetItems(nodes) droid. dialogShow() # Get the chosen dossier or listing. end result = droid. dialogGetResponse(). consequence droid. dialogDismiss() if 'item' no longer in outcome: go back goal = nodes[result['item']] target_path = os. direction. join(path, objective) if goal == '.. ': target_path = os. direction. dirname(path) # If a listing, exhibit its contents. if os. course. isdir(target_path): show_dir(target_path) # If an MP3, play it. elif os. course. splitext(target). lower() == '. mp3': droid. startActivity('android. cause. motion. VIEW', 'file://' + target_path, 'audio/mp3') # If no longer, tell the consumer. else: droid. dialogCreateAlert('Invalid File', 'Only . mp3 records are at present supported! ') droid. dialogSetPositiveButtonText('Ok') droid. dialogShow() droid. dialogGetResponse() show_dir(path) if __name__ == '__main__': show_dir() There are a number of extra issues worthy discussing during this instance that Python makes so easy. checking out for a selected dossier extension takes only one line of code, like this: os. direction. splitext(target). lower() additionally, you might want to discover different os. course tools utilized in this script, os. direction. subscribe to and os. course. isdir. The os. course library module has a number of equipment on hand to make facing dossier platforms and documents a section of cake. development the mysettings App the elemental inspiration at the back of the settings script is to construct a bit application application that might create scripts adapted to a selected blend of mobile settings.