//filename: SimpleTriangleRenderer2.java
public class SimpleTriangleRenderer2 extends AbstractRenderer
{
   private final static int VERTS = 4;
   private FloatBuffer mFVertexBuffer;
   private ShortBuffer mIndexBuffer;

   public SimpleTriangleRenderer2(Context context)
   {
      ByteBuffer vbb = ByteBuffer.allocateDirect(VERTS * 3 * 4);
      vbb.order(ByteOrder.nativeOrder());
      mFVertexBuffer = vbb.asFloatBuffer();

      ByteBuffer ibb = ByteBuffer.allocateDirect(6 * 2);
      ibb.order(ByteOrder.nativeOrder());
      mIndexBuffer = ibb.asShortBuffer();

      float[] coords = {
         -1.0f, -1.0f, 0, // (x1,y1,z1)
         1.0f, -1.0f, 0,
         0.0f, 1.0f, 0,
         1.0f, 1.0f, 0
      };

      for (int i = 0; i < VERTS; i++) {
         for(int j = 0; j < 3; j++) {
            mFVertexBuffer.put(coords[i*3+j]);
         }
      }
      short[] myIndecesArray = {0,1,2, 0,2,3};
      for (int i=0;i<6;i++)
      {
         mIndexBuffer.put(myIndecesArray[i]);
      }
      mFVertexBuffer.position(0);
      mIndexBuffer.position(0);
   }

   protected void draw(GL10 gl)
   {
      gl.glColor4f(1.0f, 0, 0, 0.5f);
      gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mFVertexBuffer);
      gl.glDrawElements(GL10.GL_TRIANGLES, 6, GL10.GL_UNSIGNED_SHORT,
      mIndexBuffer);
   }
}