Android design patterns
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Android design patterns

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Slides from the guru session about Android Design Patterns and tools held at Appsterdam / Bouncespace at 20/10/2012

Slides from the guru session about Android Design Patterns and tools held at Appsterdam / Bouncespace at 20/10/2012

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  • Very good presentation. I will recommend it to my students. Thank you, Raul!
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Android design patterns Android design patterns Presentation Transcript

  • Android Design Patterns Raul Portales @sla_shalafi Platty Soft @plattysoft
  • Why?Good Design = Happy Users
  • Device Independent DesignSave yourself time and headaches
  • Device Independent Design● Use dips● Prefer Relative Layouts● Qualify dimensions as resources – Best way to move to tablets
  • Fragments Design for phones and tabletsReuse as much code as you can
  • Fragments● A Fragment represents a behavior or a portion of user interface in an Activity.● You can think of a fragment as a modular section of an activity, which has its own lifecycle, receives its own input events, and which you can add or remove while the activity is running (sort of like a "sub activity" that you can reuse in different activities).
  • Using Fragments● Fragments are only available 3.0+● Gingerbread is still on 50%+ of devices
  • Compat LibraryBrings Fragments back to 1.6
  • Fragments: Detail View
  • Fragments: Detail View
  • The tech side● MasterFragment● DetailFragment● Qualify layouts – xlarge-land → 2 fragments – normal → 1 fragment● MainActivity – If has a detail fragment, use it – Or write 2 different activities
  • Fragments● onCreateView● onViewCreated● getActivity● getArguments
  • Common Pitfalls● Be aware of the Constructor!!● The Activity may not be always there – It may have been destroyed – Or the fragment detached● There is no communication among fragments – Do it through the Activity – Better: Use an interface
  • FragmentManager● findFragmentById● findFragmentByTag● FragmentTransactionFragmentManager fm = getSupportFragmentManager();FragmentTransaction ft = fm.beginTransaction();ft.replace(R.id.mainFragment, MyFragment.newInstance());ft.commitAllowingStateLoss();
  • Fragments: View PagerThe most useful utility of Fragments
  • Fragments: View Pager
  • The tech side● MainActivity● FragmentPagerAdapter – Fragments
  • Show me the Code <android.support.v4.view.ViewPager android:id="@+id/pager" android:layout_width="fill_parent" android:layout_height="0px" android:layout_weight="1"/> </LinearLayout>ViewPager pager = (ViewPager) findViewById(R.id.pager);pager.setAdapter(adapter);
  • Action BarMain improvement in 3.0 and 4.0 Has been around since 2009
  • Action Bar● Provide a dedicated space for identifying the application brand and user location.● Provide consistent navigation and view refinement across different applications.● Make key actions for the activity (such as "search", "create", "share", etc.) prominent and accessible to the user in a predictable way.
  • Action Bar1.App icon2.View control3.Action buttons4.Action overflow
  • Action Buttons● Frequent● Important● Typical
  • Show me the Codepublic boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main_activity, menu); return true;}<menu xmlns:android="...”> <item android:id="@+id/menu_save" android:icon="@drawable/ic_menu_save" android:title="@string/menu_save" android:showAsAction="ifRoom|withText" /></menu>
  • The Action Bar is NOT part of the Compat Library
  • ActionBarSherlock● Deprecated from Inception – Same class names, different packages● Based on the Compat library● From Android 2.x up
  • Using ABS● Add ABS as library● Use the theme for your App● getActionBar → getSupportActionBar● Activity → SherlockActivity● FragmentActivity → SherlockFragmentActivity● Fragment → SherlockFragment● And so on...
  • ViewPageIndicatorYou have seen it in the screenshots Combined with a ViewPager
  • ViewPageIndicator
  • Show me the Code<com.viewpagerindicator.TitlePageIndicator android:id="@+id/indicator" android:padding="10dip" android:layout_height="wrap_content" android:layout_width="fill_parent" />mIndicator = (TitlePageIndicator)findViewById(R.id.indicator);mIndicator.setViewPager(pager);
  • Navigation Styles● Top navigation tabs – For a clear landing page● Dashboard – For a set of important options● Drawer – Combined with a landing page
  • Navigation Styles Vs.
  • Testing on devices
  • Testing on devices
  • Testing on devices
  • Testing on devices
  • Doing more with less● Gingerbread, hdpi, normal → Nexus One● Jelly Bean, xhdpi → Galaxy Nexus● Froyo, mdpi → HTC Magic● ICS, xlarge → Asus Transformer● large → Nexus 7 / Galaxy Tab 7● Honeycomb → Galaxy Tab
  • To know more...● Android Design Site: http://developer.android.com/design● Google I/O videos, specially day 3 https://developers.google.com/events/io/sessions#android● ActionBarSherlock http://actionbarsherlock.com/● ViewPageIndicator http://viewpagerindicator.com/
  • Android Design Patterns Raul Portales @sla_shalafi Platty Soft @plattysoft