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    <p>Initializing the Buffers in your onDrawFrame method doesn't look right.</p> <p>I suggest you create a basic Rectangle class with vertices and indices as fields:</p> <pre><code>public class Rectangle { private float vertices[]={ -1.0f, 1.0f, 0.0f, -1.0f,-1.0f,0.0f, 1.0f,-1.0f,0.0f, 1.0f,1.0f,0.0f }; private short[] indices = {0,1,2,0,2,3}; private FloatBuffer vertexBuffer; private ShortBuffer indexBuffer; public Rectangle(){ ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4); vbb.order(ByteOrder.nativeOrder()); vertexBuffer = vbb.asFloatBuffer(); vertexBuffer.put(vertices); vertexBuffer.position(0); ByteBuffer ibb = ByteBuffer.allocateDirect(indices.length * 2); ibb.order(ByteOrder.nativeOrder()); indexBuffer = ibb.asShortBuffer(); indexBuffer.put(indices); indexBuffer.position(0); } public void draw(GL10 gl){ gl.glFrontFace(GL10.GL_CCW); gl.glEnable(GL10.GL_CULL_FACE); gl.glCullFace(GL10.GL_BACK); gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer); gl.glDrawElements(GL10.GL_TRIANGLES, indices.length, GL10.GL_UNSIGNED_SHORT, indexBuffer); gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); gl.glDisable(GL10.GL_CULL_FACE); } } </code></pre> <p>Add a Rectangle field to your Renderer and initialize it in the Renderer's constructor:</p> <pre><code>public MyOpenGLRenderer() { mRectangle = new Rectangle(); } </code></pre> <p>and call the Rectangle's draw method in your Renderer's onDrawFrame method:</p> <pre><code> public void onDrawFrame(GL10 gl) { //... mRectangle.draw(gl); } </code></pre> <p>Follow the first 3 parts of <a href="http://www.jayway.com/2009/12/03/opengl-es-tutorial-for-android-part-i/">this tutorial</a> for a complete solution to how it can be done.</p>
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    1. POdrawing rectangle in opengl android
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    1. USGunnar Karlsson
    1. USGunnar Karlsson
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    1. COI can't exactly say what it wrong with the code in the Question, but this answer looks like the sane solution in any case. The Buffers should be allocated once, not every frame.
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      1. USrioki
    2. COthanks, i did it for drawing lines and triangle with the same procedure but problems with the rectangle.
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      1. USTauhidul Alam
    3. CO@Tauhidul Alam. You might want to have a look at this tutorial as well - it goes through how to draw a rectangle on screen in section 2.4: :http://www3.ntu.edu.sg/home/ehchua/programming/android/Android_3D.html
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