I sovle it. On android phone ,you should avoid using pvr.ccz file as image. I use normal png pic and it works fine. pvr.ccz may work fine on iphone and other phone using pvr graphic card.So that’s may be the reason why the official testes don’t use pvr.ccz in the demo.
PVR texture compression is a proprietary texture compression format, only supported by PowerVR chips (Motorola and some Samsung Phones fore example)
It won’t work on Tegra 2 or Adreno devices (HTC, Sony Ericsson phones, many tablets).
You might still be able to use the compressed files. Just check if the appropriate OpenGL extension is available.
Compressed textures will save you quite some memory (video memory as well as memory bandwith)