Can anyone suggest why this code doesn't work? When I draw using this texture all I get is black. If I use GLUtils.texImage2D() to load a png file, it works correctly.

ByteBuffer bb = ByteBuffer.allocateDirect(128*128*4).order(ByteOrder.nativeOrder());
    bb.position(0);
    for(int row = 0; row != 128; row++) {
        for(int i = 0 ; i != 128 ; i++) {
            bb.put((byte)0x80);
            bb.put((byte)0xFF);
            bb.put((byte)0xFF);
            bb.put((byte)i);
        }
    }
    int[] handle = new int[1];
    GLES20.glEnable(GLES20.GL_TEXTURE_2D);
    GLES20.glGenTextures(1, handle, 0);
    DrawAdapter.checkGlError("Gen textures");
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, handle[0]);
    DrawAdapter.checkGlError("Bind textures");
    bb.position(0);
    GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA, 128, 128, 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, bb);
    DrawAdapter.checkGlError("glTexImage2D");
    return handle[0];