android oncreate获取宽高度

 1         gridView = (GridView) getView().findViewById(R.id.gridView_musicbook);
 2 
 3         gridView.getViewTreeObserver().addOnGlobalLayoutListener(
 4                 new OnGlobalLayoutListener() {
 5                     @Override
 6                     public void onGlobalLayout() {
 7                         // TODO Auto-generated method stub
 8                         mgridWidth = gridView.getWidth();//获取宽度//获取高度gridView.getHeight()

 9 // getViewTreeObserver().removeGlobalOnLayoutListener(this); 10 int itemWidth = mgridWidth / (songFiles.IMAGE_HEIGHT); 11 if (itemWidth > 0) 12  gridView.setNumColumns(itemWidth); 13  } 14 });

横竖屏切换时会重新跑oncreate事件，所以屏幕切换时会重新计算高度