I'm facing the same problem. Maybe I'm wrong, but it seems that SurfaceTexture is not compatible with GLES10. Surface texture uses GL_TEXTURE_EXTERNAL_OES, thereby it a custom fragment shader that is able to use this texture ("#extension GL_OES_EGL_image_external : require ").
As glUseProgram(...), etc are not avaible in GLES10, we cannot use custom shaders.
As I said, maybe I'm wrong... Good luck
EDIT : I finaly get it to work. You should use "gl.glEnable(GLES11Ext.GL_TEXTURE_EXTERNAL_OES);"