Jellybean tips and tricks

Jellybean tips and tricks from FITC

Transcript

1. Faisal Abid @faisalabid www.faisalabid.com ANDROID AND JELLYBEAN TIPS AND TRICKS
2. Faisal Abid @faisalabid www.faisalabid.com • Software developer working with Android since the beta days • Started working in Node.js and Coffeescript for the past year. • Software Engineer at Kobo • Co-Author Flex 3 in Action • Entrepreneur, Author, Teacher & Developer WHO AM I?
3. Faisal Abid @faisalabid www.faisalabid.com ABOUT THIS TALK • Learn some of the tips and tricks I’ve learnt over the years • Working at Kobo and building an Android tablet, you pick up on a few cool things. • I want to share these things with you!
4. Faisal Abid @faisalabid www.faisalabid.com • Up and Back are two different things now. As if things weren’t bad enough. • Up means going up to the next page in the app. • Back means going back irrespective of where you are. • You can control this stuff in code but it gets messy. • Android Jellybean introduces the new ParentActivity tag in the manifest 1. AppStackNavigation
5. Faisal Abid @faisalabid www.faisalabid.com • Getting thumbnails from Android videos is very weird. • ICS’s new MediaMetadataRetriever makes it easy 2. Getting Media Thumbnails private Bitmap getThumbnailForVideoUri(Context cx, Uri contentURI) { MediaMetadataRetriever retriever = new MediaMetadataRetriever(); try { retriever.setDataSource(cx, contentURI); return retriever.getFrameAtTime(); } catch (Exception e) { // exception } }
6. Faisal Abid @faisalabid www.faisalabid.com • I honestly had no idea you could do this! • Set an alarm programmatically. Not an AlarmManager alarm, but an actual alarm. 3. Set Alarm Programmatically Intent i = new Intent(AlarmClock.ACTION_SET_ALARM);
7. Faisal Abid @faisalabid www.faisalabid.com • Lots and lots of ways exist. • Tried many solutions • This one worked the best 4. Handle Bitmap OOM Errors
8. Faisal Abid @faisalabid www.faisalabid.com • I love progress loaders. Really set the app apart • WhereIsMyBus has a cool progress loader • AnimationDrawable will give you OOM. • AnimationDrawable loves to load up all the items in memory. • Solution is by “Yar” from StackOverFlow http://bit.ly/OsGSsb 5. Handling Awesome progress animations
9. Faisal Abid @faisalabid www.faisalabid.com • Simple but cool. In Jellybean Android added new activity animation. • Take advantage of them! 6. ActivityAnimations
10. Faisal Abid @faisalabid www.faisalabid.com • With Project Butter. Android Animation keeps getting better. • Use the built-in .animate() class to get full performance. • No need to learn OpenGL or anything else for trivial animations. 7. Animation keeps getting better
11. Faisal Abid @faisalabid www.faisalabid.com • Honeycomb introduced this. • Not widely known. • call() you can add all the cool stuff you want. • Built system wide image cache on the Arc. 8. ContentProvider with custom methods!
12. Faisal Abid @faisalabid www.faisalabid.com • Still not used as much as you should • Simple as running monkeyrunner. 9. Monkey
13. Faisal Abid @faisalabid www.faisalabid.com • ICS, AsyncTasks run in a single threaded threadpool now. • To change it run it on an executor. 10. Async Tasks have changed!
14. Faisal Abid @faisalabid www.faisalabid.com • More of a PSA • Soon android users will be required to allow the app to Read SD card. • Read_External_storage is a good permission to have, Start thinking about it. • You’ll get a filenotfound exception if you don’t have it. • If you have Write_External_storage you are good 11. Security Changes to Android
15. Faisal Abid @faisalabid www.faisalabid.com • As of Android 3.1, no BroadcastReceiver will work until the user has manually launched an activity 11.5. More security changes
16. Faisal Abid @faisalabid www.faisalabid.com THANK YOU!