android-Supporting Different Devices

Some of the important variations that you should consider include different languages, screen sizes, and versions of the Android platform.

> Supporting
Different Languages

Learn how to support multiple languages with alternative string resources.
Supporting Different Screens
Learn how to optimize the user experience for different screen sizes and densities.
Supporting Different Platform Versions
Learn how to use APIs available in new versions of Android while continuing to support older versions of Android.

>To add support for more
languages, create additional

values

directories
inside

res/

that include a hyphen and the ISO language code at the end of the directory name.

MyProject/
res/
values/
strings.xml
values-es/
strings.xml
values-fr/
strings.xml

>Android categorizes device screens using two general properties: size and density. (Different
Screens)

As such, you should include some alternative resources that optimize your app’s appearance for different screen sizes and densities.

There are four generalized sizes: small, normal, large, xlarge
And four generalized densities: low (ldpi), medium (mdpi), high (hdpi), extra high (xhdpi)

To optimize your user experience on different screen sizes, you should create a unique layout XML file for each screen size you want to support.

MyProject/
res/
layout/              # default (portrait)
main.xml
layout-land/         # landscape
main.xml
layout-large/        # large (portrait)
main.xml
layout-large-land/   # large landscape
main.xml

Note: Android 3.2 and above supports an advanced method of defining screen sizes that allows you
to specify resources for screen sizes based on the minimum width and height in terms of density-independent pixels.

To generate these images, you should start with your raw resource in vector format and generate the images for each density using the following size scale:

xhdpi: 2.0
hdpi: 1.5
mdpi: 1.0 (baseline)
ldpi: 0.75

MyProject/
res/
drawable-xhdpi/
awesomeimage.png
drawable-hdpi/
awesomeimage.png
drawable-mdpi/
awesomeimage.png
drawable-ldpi/
awesomeimage.png

>how to take advantage of the latest APIs while continuing to support older versions as well.(Platform
Versions)
Tip: In order
to provide the best features and functionality across several Android versions, you should use the Android
Support Library in your app, which allows you to use several recent platform APIs on older versions.

<uses-sdk android:minSdkVersion="4" android:targetSdkVersion="15" />

private void setUpActionBar() {
// Make sure we're running on Honeycomb or higher to use ActionBar APIs
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
}
}

<activity android:theme="@android:style/Theme.Dialog">

<application android:theme="@style/CustomTheme">