Sprint has just released an early developer guide for the HTC EVO 4G aimed at developers who want to start developing applications for the device prioir to the product launch:
This documentation covers additional functionality that will be available for the HTC EVO 4G Android device. This documentation is intended for the 3rd party developers who want to start developing applications for the device prior to official launch of the product. While every attempt has been made to ensure the included documentation is accurate, Sprint reserves the right to make changes to device functionality and API design prior to the release of this device for public sale. This document will be updated with changes and/or additions as they become available during the final stages of the devices testing.
Any new APIs covered in this documentation will be depreciated when an Android release supports the standard API that can replace the APIs in this documentation. In some cases constant values will need to be hard-coded in your application until a future SDK is released from the Android team that supports these future constant values. In the included code samples some CDMA values may be new as of the Android Éclair release, in order to compile these values on prior builds such as the Android Cupcake release we have included the constant values.
There’s a nice chapter on the HDMI output support for those interested. You can the guide here.
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