private void loadTextures(GL10 gl) {
for (int i = 0; i < BUTTON_NUM; i++) {
int gazouID = getResources().getIdentifier("gazou"+Integer.toString(i), "drawable", getPackageName());
this.mButtonTexture[i] = GraphicUtil.loadTexture(gl, res, gazouID);
}
}

こんな感じでいいんでないかい？