The document discusses various techniques for developing Android applications that work across different device configurations and Android platform versions. It covers topics like screens sizes and densities, different layouts, using fragments and activities, leveraging new APIs while maintaining backwards compatibility, and using fallbacks and workarounds to support older platforms.

1. Dominik Helleberg | inovex GmbH
One APK to rule them all

2. Dominik Helleberg
Mobile Development
Android
HTML5
http://dominik-helleberg.de/+
http://twitter.com/_cirrus_

3. Der Android Zoo

4. Besser?

5. The
F
Word

6. Der Android Zoo
Challenging,
but
Android is designed to
handle that!

7. Getting started... Screens
Resolution
Screensize Density

8. Screensize
2‘‘ 4‘‘ 7‘‘ 10‘‘
small normal large xlarge

9. Resolution
1280x800
1280x720
320 x 240

10. Density
120 160 200 300
ldpi mdpi hdpi xhdpi

11. ???
Resolution
Screensize Density

12. DP & SP
120 160 200 300
ldpi mdpi hdpi xhdpi

14. PX vs. DP & SP

15. PX vs. DP & SP

16. Layout Manager
Portions of this page are reproduced from work created and shared by the Android Open Source Project and used according to
terms described in the Creative Commons 2.5 Attribution License.

17. PX vs. DP & SP

18. PX vs. DP & SP

19. Spezialisierte Layouts
layout/
layout-­‐land/
layout-­‐hdpi/
layout-­‐large-­‐land/
layout-­‐sw600dp/

20. PX vs. DP & SP

21. Spezialisierte Layouts
Portions of this page are reproduced from work created and shared by the Android Open Source Project and used according to
terms described in the Creative Commons 2.5 Attribution License.

23. Ab wann ist man Tablet?
layout-­‐v11/
layout-­‐land/
layout-­‐xlarge/
layout-­‐sw600dp/
layout-­‐sw720dp/

24. Activity vs. Fragment Control
Portions of this page are reproduced from work created and shared by the Android Open Source Project and used according to
terms described in the Creative Commons 2.5 Attribution License.

25. Activity vs. Fragment Control
Tab ActionBar
click
Fragment Fragment
Activity

26. Activity vs. Fragment Control
Tab ActionBar
click
Fragment Fragment
Activity

27. Android À la carte
Portions of this page are reproduced from work created and shared by the Android Open Source Project and used according to
terms described in the Creative Commons 2.5 Attribution License.

28. Android À la carte - APIs
Intent
i
=
null;
if(android.os.Build.VERSION.SDK_INT
>=
android.os.Build.VERSION_CODES.JELLY_BEAN)
{
i
=
new
Intent(this,
JellyBeanActivity.class);
}
else
i
=
new
Intent(this,
DefaultActivity.class);

29. Android À la carte - APIs
LocationUpdateRequester
LegacyUpdateRequester
FroyoUpdateRequester
GingerBread
UpdateRequester
http://code.google.com/p/android-protips-location/

30. Android À la carte - APIs
CompatLib
CustomImpl
Wrapper

31. Android À la carte - Ressourcen
values/bools.xml
<resources>
<bool name="ICS">false</bool>
<bool name="preICS">true</bool>
</resources>
values-­‐v14/bools.xml
<resources>
<bool name="ICS">true</bool>
<bool name="preICS">false</bool>
</resources>

32. Android À la carte - Ressourcen
<service android:name=".ICSService"
android:enabled="@bool/ICS">
</service>

33. Android À la carte - Ressourcen
Layout
Layout-­‐v14
Header
Header
Content
Content

34. Android À la carte - Ressourcen
Layout
Layout-­‐v14
<include/>
Header
<include/>
Content
Content

35. Android À la carte - Ressourcen

36. Android À la carte - Ressourcen

37. Get it right - lint

38. Get it right - lint

39. Get it right - CI

40. Get it right – Real Devices

41. Fallbacks / Workarounds
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion=“16" />
<supports-screens .../>
<compatible-screens ></compatible-screens>
<uses-feature
android:name="android.hardware.nfc"
android:required="true"/>

42. Fallbacks / Workarounds
Target
Max
Sdk
Sdk
10 11-13 16

43. Fallbacks / Workarounds
Target
Max
Sdk
Sdk
10 11-13 16

44. Fallbacks / Workarounds
<supports-screens android:xlargeScreens="false" />

45. Fallbacks / Workarounds

46. Fallbacks / Workarounds
<manifest ... >
<supports-screens
android:smallScreens="false"
android:normalScreens="false"
android:largeScreens="true"
android:xlargeScreens="true"
android:requiresSmallestWidthDp="600" />
...
<application ... >
...
</application>
</manifest>
Portions of this page are reproduced from work created and shared by the Android Open Source Project and used according to
terms described in the Creative Commons 2.5 Attribution License.

47. Fallbacks / Workarounds
<manifest ... >
<compatible-screens>
<!-- all small size screens -->
<screen android:screenSize="small" android:screenDensity="ldpi" />
<screen android:screenSize="small" android:screenDensity="mdpi" />
<screen android:screenSize="small" android:screenDensity="hdpi" />
<screen android:screenSize="small" android:screenDensity="xhdpi" />
<!-- all normal size screens -->
<screen android:screenSize="normal" android:screenDensity="ldpi" />
<screen android:screenSize="normal" android:screenDensity="mdpi" />
<screen android:screenSize="normal" android:screenDensity="hdpi" />
<screen android:screenSize="normal" android:screenDensity="xhdpi" />
</compatible-screens>
...
<application ... >
...
<application>
</manifest>
Portions of this page are reproduced from work created and shared by the Android Open Source Project and used according to
terms described in the Creative Commons 2.5 Attribution License.

48. DANKE!