Android screen captures only function in the following circumstances:
・Android 4.0 or later
・OpenGL ES 2.0 or later
・The platform (chipset) is whitelisted
Devices which do not meet the above requirements will not experience difficulties with other functionality, but the screen capture feature will not function.
For the supported device list and other specific details, please refer to the Android SDK Integration Manual, section 6. OpenGL ES Supported Platforms.