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<The Android 3.0 Fragments API ⁄ >

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An important goal for Android 3.0 is to make it easier for developers to write applications that can scale across a variety of screen sizes, beyond the facilities already available in the platform:

- Since the beginning, Android's UI framework has been designed around the use of layout managers, allowing UIs to be described in a way that will adjust to the space available. A common example is a ListView whose height changes depending on the size of the screen, which varies a bit between QVGA, HVGA, and WVGA aspect ratios.

- Android 1.6 introduced a new concept of screen densities, making it easy for apps to scale between different screen resolutions when the screen is about the same physical size. Developers immediately started using this facility when higher-resolution screens were introduced, first on Droid and then on other phones.

- Android 1.6 also made screen sizes accessible to developers, classifying them into buckets: "small" for QVGA aspect ratios, "normal" for HVGA and WVGA aspect ratios, and "large" for larger screens. Developers can use the resource system to select between different layouts based on the screen size.

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