Droidcon 2013 Multidevice Nightmare

www.immobilienscout24.de

The Multi-Device Nightmare
- and how to clear the Elm Street

Droidcon | Berlin | 09.03.2013 | Hasan Hosgel

About me

Hasan Hosgel

Twitter: @alosdev
Github: alosdev
Google+: Hasan Hosgel
Slideshare: hosgel

developer @ ImmobilienScout24
CO-Organizer @ GDG Android in
Berlin
& community events

Droidcon 2013 | Mutli-Device Nightmare | Hasan Hosgel

Fragmentation


Fragmentation

> 2700 Android Devices


Here comes The Nightmare

Image source: Droidcon 2013 | Mutli-Device Nightmare | Hasan Hosgel
http://www.flickr.com/photos/boogeyman13/4553188509/

Here comes The Nightmare

For developers

Image source: Droidcon 2013 | Mutli-Device Nightmare | Hasan Hosgel
http://www.flickr.com/photos/boogeyman13/4553188509/

Device Classification

Images sources: Droidcon 2013 | Mutli-Device Nightmare | Hasan Hosgel
https://play.google.com/store/devices


https://play.google.com/store/devices
http://www.htc.com/de/


http://www.sony.de/hub/google-tv


Images Sources Droidcon 2013 | Mutli-Device Nightmare | Hasan Hosgel
https://developer.ford.com/

Resource Folders

You can use several qualifiers in the resource folders name for serving
the best matching resource. Most used qualifiers:

● Language (-en)
● Language & Region (-en-rUS)
● Smallest Width (-swXXXdp, e.g. –sw600dp)
● Screensize (-small, -normal, -large)
● Screen Orientation (-port, -land)
● Screen Pixel Densitiy (-mdpi, -hdpi, -xhdpi, -xxhdpi)
● Platform Version (-v11, -v13)


Resource Folders

If you have several resource folders, the one with the greatest
matching number qualifiers will be used. e.g. :

1. res/values/strings.xml
2. res/values-en-rUS/strings.xml
3. res/values-large/strings.xml
4. res/values-sw600dp/strings.xml


Resource Folders

If you have several resource folders, the one with the greatest
matching number qualifiers will be used. e.g. :

1. res/values/strings.xml
2. res/values-en-rUS/strings.xml
3. res/values-large/strings.xml
4. res/values-sw600dp/strings.xml

If two resources have the same number of matching qualifiers, the
ordering in the previous slide will rank the qualifiers.

e.g. Device configurations:
Nexus One: 1.
Galaxy Tab 7.0 in German: 3.
Nexus 7: 4.


Images

● Use the different qualifiers for the screen pixel density (mdpi, hdpi,
etc.)
● If you are forced to use text on images use language and region
(en, es-rUs, en-rUS, etc.)
● Better approach is to use 9-patch drawables, which stretches
automatically depending on the content inside.
More about it: developer.android.com
● You must provide different launcher icons for Froyo, Honeycomb
and above? Use the platform version. (v4, v11, v14)


Classifications For Layouts

If your minimum SDK is at least platform version 13 (Honeycomb MR2)

project-folder/res/
layout/  small phones
layout-sw320dp/  other phones
layout-sw600dp/  tablets 7”

You should also use orientation


Classifications For Layouts

If your minimum SDK is lower than platform version 11 (Honeycomb)
project-folder/res/
layout/  phones
layout-v11/  tablets 10”
layout-v13/  small phones
layout-sw320dp/  other phones

The smallest width qualifier gets automatically platform version “v13”
through the packager, for avoiding problems with the number of
matching qualifiers.
You can also use the screen size qualifier, if you want to reach
small, medium and large screens previous to Honeycomb.


Classifications In Code

You can read the configurations from the device.

Smarter Approach: use boolean resources

project-folder/res/values/layouts.xml
<resources>
<bool name="is_phone_small”>false</bool>
<bool name="is_phone_other">true</bool>
<bool name="is_tablet_7”>false</bool>
</resources>


Classifications In Code

You can read the configurations from the device.

Smarter Approach: use boolean resources

project-folder/res/values/layouts.xml
<resources>
<bool name="is_phone_small”>false</bool>
<bool name="is_phone_other">true</bool>
</resources>

Usage in code:
Context.getResources().getBoolean(R.bool.is_phone_small)


Current Layout File Structure

project-folder/res/
layout/main.xml
layout-v11/main.xml
layout-v13/main.xml
layout-sw320dp/main.xml



project-folder/res/
layout/main.xml
layout-v11/main.xml
layout-v13/main.xml

Fixing one bug in the 10“ layout has to be done in two files.



project-folder/res/
layout/main.xml
layout-v11/main.xml
layout-v13/main.xml

Fixing one bug in the 10“ layout has to be done in two files.
 error prone


Resource Alias

1. Put your layout files in the default folder.

project-folder/res/
layout/main.xml
layout/main_phone_other.xml
layout/main_tablet_7.xml


Resource Alias

1. Put the needed layout files in the default folder.

project-folder/res/
layout/main.xml
layout/main_phone_other.xml

2. Declare another resource file in the values folder and create an item
with the needed classification.

project-folder/res/values-sw600dp/layouts.xml
<item name=“main” type=“layout”>@layout/main_tablet7</item>


Sample Screen


Sample Screen

Use <includes>


Sample Screen

Create custom view

Use <includes>


Custom View
public class CustomView extends LinearLayout {
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutParams lp = …
addView(getText(context, "label"), lp);
addView(getText(context, "value"), lp);
if (context.getResources().getBoolean(R.bool.is_phone) ||
context.getResources().getBoolean(R.bool.is_phone_other)) {
setOrientation(VERTICAL);
} else {
setOrientation(HORIZONTAL);
}
}
private TextView getText(Context context, String text) {
TextView textView = new TextView(context);
textView.setText(text);
return textView;
}
}

Sample Screen

Create custom view

If custom view has much more
business logic and need lifecycles
 Create a Fragment

Use <includes>


Custom XML Attribute (attrs.xml)

<resources>
<declare-styleable name=”CustomView">
<attr name="label" format="reference|string" />
<attr name="value" format="reference|string" />
<attr name="orientation" format="enum">
<enum name="horizontal" value="0" />
<enum name="vertical" value="1" />
</attr>
</declare-styleable>
<resources>


Custom XML Attribute (main.xml)

Add to root XML node
xmlns:app="http://schemas.android.com/apk/res/de.alosdev"

Usage in custom view

<de.alosdev.CustomView
android:id="@+id/customView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:label="label 1"
app:orientation="vertical"
app:value="value 1" />


Custom XML Attribute (CustomView.java)

public class CustomView extends LinearLayout {
static final int[] ORIENTATION = new int[] { HORIZONTAL, VERTICAL
};
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
…
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.CustomView);
try {
setOrientation(ORIENTATION[
a.getInt(R.styleable.CustomView_orientation, 0)]);
} finally {
a.recycle();
}
}
…
}

Best Practices
which learned painfully

● You have already an application
Remove orientation fixation and suppressing of orientation
change from manifest to avoid long bug analyzing.
● You start from the scratch
Focus on main classification for faster time to market
But create an overall concept for better modularization
● If you support both orientations, save the instance state while
orientation changes for more responsiveness
Especially for states, need a long computation for creation.
Make the state object Parcelable for faster write & read


Mission Accomplished

http://www.flickr.com/photos/ianaberle/5729561934/ Droidcon 2013 | Mutli-Device Nightmare | Hasan Hosgel

Q&A

Page 36
Source: http://www.flickr.com/photos/21496790@N06/5065834411/ Droidcon 2013 | Mutli-Device Nightmare | Hasan Hosgel

www.immobilienscout24.de

Thanks for your attention!

Contact:

Hasan Hosgel Multidevice Nightmare
Twitter: @alosdev Repo: https://github.com/alosdev/multidevice-nightmare-demo
Github: alosdev SlideShare: http://de.slideshare.net/hosgel/droidcon-2013-multidevice-nightmare

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