on android 2.3 ,how can I ensure the higher resolution while enlarging a 3D object?

Now I’m developing an Android-based 3D app with opengl-es, I made use of an OBJ file which consists of a 3D model and a texture image .

Currently, the apple can rotate freely on my Samsung Galaxy II with no problem. Next, I want to enlarge the apple while keeping the definition of its texture, but I didn't make it . I need help to achieve that. Any suggestion or pointing would be highly appreciated. Thanks in advance.

You might want to consider asking your question on the OpenGL ES forums. You will also want to show code and ask specific questions as to the problem you are having.