Any good example for openGLES shader in android?

Check the examples that come with Android SDK. There are examples that show how to use shaders with OpenGL ES 2.0.

Like this one: http://developer.android.com/resources/tutorials/opengl/opengl-es20.html

Here is good tutorial for OpenGLES 2.0 shader in android. It's also given step by step develop application. The best option for you would be to read OpenGL ES 2.0 Specification.

Android Lesson One from Learn OpenGL ES website is good.

In this lesson, we’re going to go over the code step-by-step, and look at how to create an OpenGL ES 2 context and draw to the screen. We’ll also take a look at what shaders are and how they work, as well as how matrices are used to transform the scene into the image you see on the screen. Finally, we’ll look at what you need to add to the manifest to let the Android market know that you’re using OpenGL ES 2.