ETC1 (Ericcson texture compression). This format is supported by all Android phones. But, It doesn't support an alpha channel, so can only be used for opaque textures.
PVRTC (PowerVR texture compression). Supported by devices with PowerVR GPUs (Nexus S, Kindle fire...).
ATITC (ATI texture compression).Used in devices with Adreno GPU from Qualcomm (Nexus One...).
S3TC (S3 texture compression). This texture compression is used in the NVIDIA chipset integrated devices (Motorola Xoom...)
ETC1 (Ericcson texture compression). This format is supported by all Android phones. But, It doesn't support an alpha channel, so can only be used for opaque textures.
PVRTC (PowerVR texture compression). Supported by devices with PowerVR GPUs (Nexus S, Kindle fire...).
ATITC (ATI texture compression).Used in devices with Adreno GPU from Qualcomm (Nexus One...).
S3TC (S3 texture compression). This texture compression is used in the NVIDIA chipset integrated devices (Motorola Xoom...)