google added fragment API support for older devices with a Static library. This should help developers massively when developing the applications targeted at devices with various form factors, screen sizes and input controls.
With android becoming a huge success and primary OS for hardware manufacturers like samsung , motorola and htc. The tool is seen as good move to counter the fragmentation criticism in the Android ecosystem.
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This really good because screen resolution has problem some time in Android. For Games always think about resolution but Now developers create application for all devices.