OpenGL ES triangle not showing

OpenGL ES triangle not showing

References

Reference NO 1

http://stackoverflow.com/questions/13658834/opengl-es-triangle-not-showing

Reference NO 2

http://stackoverflow.com/questions/17536132/why-is-my-triangle-not-displaying-in-opengl-es

Reference NO 3

http://obviam.net/index.php/opengl-es-android-displaying-graphical-elements-primitives/

Reference NO 4

http://www.khronos.org/assets/uploads/books/openglr_es_20_programming_guide_sample.pdf

Reference NO 5

http://developer.apple.com/library/ios/documentation/3ddrawing/conceptual/opengles_programmingguide/TechniquesforWorkingwithVertexData/TechniquesforWorkingwithVertexData.html

Reference NO 6

http://pandorawiki.org/OpenGL_ES_1.1_Tutorial

Reference NO 7

http://open.gl/drawing

Reference NO 8

http://qt-project.org/doc/qt-4.8/opengl-cube.html