Drawing GL_POINTS

I'm drawing (I want to draw) a single point in the middle of the view and I have desired result on AVD (Nexus 4, Android 4.4.2 - API level 19, Intel Atom (x86), RAM 768, Use Host GPU), but I have issue while drawing it on real device [Nexus 5, Nexus 7 (2012 version)]. On real device there is only blank (clear color) view and no point in the middle. Here's a complete code. It's relatively simple. Note I also tried push point data (position) by glVertexAttribPointer (glEnableVertexAttribArray). Can you help me with this issue? ``` package com.example.point.app; import android.app.Activity; import android.content.Context; import android.opengl.GLES20; import android.opengl.GLSurfaceView; import android.os.Bundle; import javax.microedition.khronos.egl.EGLConfig; import javax.microedition.khronos.opengles.GL10; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new PointView(this)); } class PointView extends GLSurfaceView { public PointView(Context context) { super(context); setEGLContextClientVersion(2); setEGLConfigChooser(8, 8, 8, 8, 16, 0); setRenderer(new PointRenderer()); } class PointRenderer implements Renderer { private void checkError(String message) { int err = GLES20.glGetError(); if (err != GLES20.GL_NO_ERROR) { throw new RuntimeException(message + " -> " + err); } } private int createShader(int type, String source) { int shader = GLES20.glCreateShader(type); GLES20.glShaderSource(shader, source); checkError("glShaderSource"); GLES20.glCompileShader(shader); checkError("glCompileShader"); return shader; } @Override public void onSurfaceCreated(GL10 unused, EGLConfig config) { int vertex = createShader(GLES20.GL_VERTEX_SHADER, "" + "void main() {" + " gl_Position = vec4(0, 0, 0, 1);" + " gl_PointSize = 100;" + "}"); int fragment = createShader(GLES20.GL_FRAGMENT_SHADER, "" + "precision mediump float;" + "void main() {" + " gl_FragColor = vec4(1, 0, 1, 1);" + "}"); program = GLES20.glCreateProgram(); checkError("glCreateProgram"); GLES20.glAttachShader(program, vertex); checkError("glAttachShader(vertex)"); GLES20.glAttachShader(program, fragment); checkError("glAttachShader(fragment)"); GLES20.glLinkProgram(program); checkError("glLinkProgram"); } @Override public void onSurfaceChanged(GL10 unused, int width, int height) { } @Override public void onDrawFrame(GL10 unused) { GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT); GLES20.glUseProgram(program); GLES20.glDrawArrays(GLES20.GL_POINTS, 0, 1); } private int program; } } } ```